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regard to this manual and any information
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Keysight shall not be liable for errors or for
incidental or consequential damages in
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information contained herein. Should
Keysight and the user have a separate
written agreement with warranty terms
covering the material in this document that
conflict with these terms, the warranty
terms in the separate agreement shall
control.
Manual Editions
Manual Part Number: 5969-2937
Edition 8, January 2015
Printed in Malaysia.
Reprints of this manual containing minor
corrections and updates may have the
same printing date. Revised editions are
identified by a new printing date. .
Declaration of Conformity
Declarations of Conformity for this product
and for other Keysight products may be
downloaded from the Web. Go to
http://www.keysight.com/go/conformity
and click on “Declarations of Conformity.”
You can then search by product number to
find the latest Declaration of Conformity
Waste Electrical and
Electronic Equipment (WEEE)
Directive 2002/96/EC
This product complies with the WEEE
Directive 2002/96/EC) marketing
requirement. The affixed product label (see
below) indicates that you must not discard
this electrical/electronic product in
domestic household waste.
Product Category: With reference to the
equipment types in the WEEE directive
Annex 1, this product is classified as
“Monitoring and Control instrumentation”
product.
Do not dispose in domestic household
waste.
To return unwanted products, contact our
local Keysight office, or see
www.keysight.com/environment/product
for more information.
Certification
Keysight Technologies certifies that this
product met its published specifications at
time of shipment from the factory. Keysight
Technologies further certifies that its
calibration measurements are traceable to
the United States National Institute of
Standards and Technology, to the extent
allowed by the Institute's calibration
facility, and to the calibration facilities of
other International Standards Organization
members.
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THE REMEDIES PROVIDED HEREIN ARE
THE CUSTOMER'S SOLE AND EXCLUSIVE
REMEDIES. KEYSIGHT TECHNOLOGIES
SHALL NOT BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER
BASED ON CONTRACT, TORT, OR ANY
OTHER LEGAL THEORY.
Assistance
This product comes with the standard
product warranty. Warranty options,
extended support contacts, product
maintenance agreements and customer
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Contact your nearest Keysight
Technologies Sales and Service office for
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Technologies' full line of Support Programs.
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The hardware and or software described in
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Documentation).
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Microsoft and Windows are U.S. registered
trademarks of Microsoft Corporation.
Keysight N6700 User’s Guide 3
Both direct and alternating
current
current
equipment
equipment.
is off
push switch
push switch
CAUTION
Safety Notices
The following general safety precautions
must be observed during all phases of
operation of this instrument. Failure to
comply with these precautions or with
specific warnings or instructions elsewhere
in this manual violates safety standards of
design, manufacture, and intended use of
the instrument. Keysight Technologies
assumes no liability for the customer's
failure to comply with these requirements.
General
Do not use this product in any manner not
specified by the manufacturer. The
protective features of this product may be
impaired if it is used in a manner not
specified in the operation instructions.
Before Applying Power
Verify that all safety precautions are taken.
Make all connections to the unit before
applying power. Note the instrument's
external markings described under "Safety
Symbols"
Ground the Instrument
This product is a Safety Class 1 instrument
(provided with a protective earth terminal).
To minimize shock hazard, the instrument
chassis and cover must be connected to an
electrical ground. The instrument must be
connected to the AC power mains through
a grounded power cable, with the ground
wire firmly connected to an electrical
ground (safety ground) at the power outlet.
Any interruption of the protective
(grounding) conductor or disconnection of
the protective earth terminal will cause a
potential shock hazard that could result in
personal injury.
Fuses
The instrument contains an internal fuse,
which is not customer accessible.
Do Not Operate in an Explosive
Atmosphere
Do not operate the instrument in the
presence of flammable gases or fumes.
Do Not Remove the Instrument
Cover
Only qualified, service-trained personnel
who are aware of the hazards involved
should remove instrument covers. Always
disconnect the power cable and any
external circuits before removing the
instrument cover.
Do Not Modify the Instrument
Do not install substitute parts or perform
any unauthorized modification to the
product. Return the product to a Keysight
Sales and Service Office for service and
repair to ensure that safety features are
maintained.
In Case of Damage
Instruments that appear damaged or
defective should be made inoperative and
secured against unintended operation until
they can be repaired by qualified service
personnel.
A CAUTION notice denotes a hazard. It
calls attention to an operating
procedure, practice, or the like that, if
not correctly performed or adhered to,
could result in damage to the product
or loss of important data. Do not
proceed beyond a CAUTION notice
until the indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a hazard.
It calls attention to an operating
procedure, practice, or the like that, if
not correctly performed or adhered to,
could result in personal injury or
death. Do not proceed beyond a
WARNING notice until the indicated
conditions are fully understood and
met.
Safety Symbols
Direct current
Alternating current
Three phase alternating
Earth (ground) terminal
Protective earth ground
terminal.
Frame or chassis terminal
Terminal is at earth
potential.
Neutral conductor on
permanently installed
Line conductor on
permanently installed
On supply
Off supply
Standby supply. Unit is not
completely disconnected
from AC mains when switch
In position of a bi-stable
Out position of a bi-stable
Caution, risk of electric
shock
Caution, hot surface
Caution, refer to
accompanying description
4 Keysight N6700 User’s Guide
In this Book
NOTE
Technologies at one of the following telephone
Specific chapters in this manual contain the following information:
Quick Reference – Chapter 1 is a quick reference section that helps
you quickly become familiar with your Keysight N6700 Modular
Power System. It describes the differences between the various
modules in the power system.
Installation – Chapter 2 describes how to install your power system.
It describes how to connect various loads to the output. It discusses
remote sensing as well as parallel and series operation.
Getting Started – Chapter 3 describes how to set the voltage,
current, over-voltage protection, and turn on the output. It also
describes how to configure the remote interface.
Operating the Power System – Chapter 4 describes how to use the
advanced features of the power system using the front panel menus
and the corresponding SCPI commands.
Specifications – Appendix A describes the mainframe characteristics.
Using the Digital Port – Appendix B describes how to configure and
use the digital port on the back of the instrument.
Power Allocation – Appendix C describes the power allocation
function, which applies to power system in which the combined
ratings of the power modules exceed the power rating of the
mainframe.
Output On/Off Synchronization – Appendix D discusses output
on/off synchronization, which lets you accurately synchronize output
turn-on sequences across multiple mainframes.
Source Operating Modes – Appendix E discusses operating mode
information for all power modules.
For complete details on the SCPI (Standard Commands for
Programmable Instruments) commands, refer to the N6700
Programmer’s Reference Help file included on the Keysight N6700
Product Reference CD. This CD-ROM is shipped along with your
instrument.
You can contact Keysight
numbers for warranty, service, or technical support information.
In the United States: (800) 829-4444
In Europe: 31 20 547 2111
In Japan: 0120-421-345
Or use our Web link for information on contacting Keysight in your
country or specific location:
www.keysight.com/find/assist
Or contact your Keysight Technologies Representative.
This chapter concisely describes the operation of the Keysight N6700
Modular Power System (MPS).
This chapter does not describe every operating feature in detail. It is
simply a quick reference guide to quickly become familiar with the
essential operating features of the power system.
For complete details on the SCPI (Standard Commands for
Programmable Instruments) commands, refer to the Programmer’s
Reference Help file included on the Keysight N6700 Product Reference
CD. This CD-ROM is shipped along with your instrument.
Unless otherwise noted, the Keysight N6700 Modular Power System will
also be referred to as “MPS” and “power system” throughout this
manual.
1 Quick Reference
8 Keysight N6700 User’s Guide
The Keysight N6700 Modular Power System – At a Glance
Output Features
Programmable voltage
and current
Full programming capability is provided for the entire range of output
voltage and current. Outputs can operate as either constant voltage (CV) or
constant current (CC) sources.
Low output noise
Available on
<4.5 mV peak-to-peak, which is comparable to linear supplies.
Fast up/down
programming
Available on
≤1.5 millisecond response time from 10% to 90% of the output rating.
Fast transient response
Available on
Transient response is less than 100 μs.
The Keysight N6700 Modular Power System is a configurable, one rackunit (1U) platform that lets you mix and match power modules to create
a power system optimized for your test system requirements.
Keysight N6700–N6702 MPS mainframes are available in power levels of
400 W, 600 W, and 1,200 W. Up to four power modules can be installed
in each mainframe. Power modules come in power levels of 20 W
through 500 W, have various voltage and current combinations, and
provide the following performance features:
The N673xB, N674xB, and N677xA DC Power Modules provide
programmable voltage and current, measurement, and protection
features, making these economical models suitable for powering the
device-under-test or system resources such as fixture controls.
The N675xA High-Performance, Autoranging DC Power Modules
provide low noise, high accuracy, fast programming times, and
advanced programming and measurement capabilities to speed test
throughput.
The N676xA Precision DC Power Modules provide precise control
and measurements in the milli- and micro-ampere region with the
ability to simultaneously digitize voltage and current and capture
those measurements into an oscilloscope-like data buffer.
The N678xA Source/Measure Units (SMU) have a multiple-quadrant
The N6783A Application-Specific DC Power Modules are two-
The output and system features are described in the following sections.
Not all output features are available on every power module. The “Model
Differences” section describes the features that apply only to specific
power modules.
power mesh with separate voltage and current priority source
modes. These models are optimized for applications such as battery
drain analysis and functional testing.
quadrant low-wattage models specifically designed for battery
charging/discharging and mobile communications applications.
Keysight N676xA and N675xA power modules. Output noise is
Keysight N675xA, N676xA, and N678xA SMU power modules.
Keysight N675xA, N676xA, and N678xA SMU power modules.
Quick Reference 1
Keysight N6700 User’s Guide 9
Output autoranging
capability
Availa
Autoranging supplies the maximum rated power over a continuous range of
voltage and current settings.
Output On/Off
sequencing
A turn
sequen
Remote voltage sensing
Two remote sensing terminals are provided for each output. When shipped,
the remote sense jumpers are included in a separate bag. See Chapter 2.
Output protection
Each output has over
protection. Over-voltage and over-current protection are programmable.
Multiple-Quadrant
operation
Available on Keysight N678xA SMU and N6783A power modules.
2
model N6784A offers 4- quadrant output operation.
Measurement Features
Multiple-output/Singleoutput meter display
Switch between a 4
power supply information. All power modules display real
voltage and current measurements as well as status information.
Seamless measurement
autoranging
Available on
modules.
however, the 10 μA current range must be selected manually.
Microampere current
measurements
Available on
Current measurement can be made as low as 1
Fast digitizing
Available on
5.12 μs/sample for one parameter; 10.24 μs/sample for two parameters.
System Features
Choice of three
interfaces
GPIB (IEEE-488), LAN, and USB remote programming interfaces are built in.
Built-in Web server
A
internet browser on your computer.
SCPI language
The instrument is compatible with the Standard Commands for
Programmable Instruments (SCPI).
Front panel I/O setup
Menus let you set up
Real-time status
information
The front panel indicates the status of each output. It also indicates when a
protection shut
Module identification
Each module has identifying data stored in
Information includes model number, serial number, and options.
Universal AC input
Mainframes have
correction.
ble on Keysight N676xA and N675xA power modules.
-on/turn-off delay capability for each output allows output on/off
cing.
- quadrant operation provides source and sink output capability. Keysight
-voltage, over-current, and over-temperature
-output summary view and a 1-output detailed view of
-time output
Keysight N6781A, N6782A, N6785A, and N6786A SMU power
Output measurements seamlessly autorange between ranges –
Keysight N6761A, N6762A, and N678xA SMU power modules.
μA in the 10 μA range.
Keysight N678xA SMU power modules.
built-in Web server lets you control the instrument directly from an
GPIB and LAN parameters from the front panel.
-down has occurred.
non-volatile memory.
universal input voltage capability with active power factor
1 Quick Reference
10 Keysight N6700 User’s Guide
Model Differences
Feature
DC Power
High-Performance
Precision
N673xB, N674xB, N677xA
N675xA
N676xA
●
●
●
●
●
●
●
●
●
Feature
Source/Measure Units (SMU)
Application-Specific
N6781A
N6782A
N6784A
N6785A
N6786A
N6783A
BAT
N6783A
MFG
●
● ● ● ●
●
●
● ● ● ● ●
● ● ● ● ● ● ●
● ● ● ● ●
●
●
3 3 4 4
3 4 4 4
3 3
4 4 3 3 2
● ● ● ● ●
●
● ●
●
● ● ● ● ● ● ●
● ● ● ● ● ● ●
● ● ● ● ● ● ●
● ● ● ● ● ● ●
●
●
(● = available)
50 W output rating
100 W output rating
300 W output rating
500 W output rating
Output disconnect relays
Output disconnect/polarity reversal relays
Autoranging output capability
Voltage or current turn-on priority
Precision voltage and current measurements
Low voltage and low current output range
Low voltage and low current measurement range
200 microampere measurement range
Simultaneous voltage and current measurements
SCPI command output list capability
SCPI command array readback
Output current is limited to 10A max. on Models N6742B and N6773A with Option 760.
Option 760 is not available on Models N6741B, N6751A, N6752A, N6761A, and N6762A.
2
Option 2UA.is only available on Models N6761A and N6762A. It includes Option 761.
3
Only available when using the remote interfaces; not from the front panel.
4
List capability is not available on the negative current output on Model N6783A
20 W 80 W
●
80 W
24 W
18 W
Option 761 Option 761
2
Quick Reference 1
Keysight N6700 User’s Guide 11
The Front Panel – At a Glance
Display
inactivity. Press any key to
Navigation keys
Output keys
20.007V 4.004A
CV Set:
20.
000V 5.500A
o -
Menu
3
E
+/-
Back
.
2
0
1
4 5 6
987
Sel
Meter
Channel
Help
On/Off
Voltage
Current
1
Error
Enter
Low-Profile MPS
Mainframe
600 Watt
N6700B
On/Off switch and LED
System keys
channel and
Numeric entry keys
The Rear Panel – At a Glance
GPIB connector
Chassis ground
binding post
3-pin IEC 320 AC
input connector
+s + -s
+s + -s
+s + -s +s + -s
1 2 3 4 5 6 7
Output connector.
8-pin digital control
connector
USB connector
LAN connector
WARNING
SHOCK HAZARD The power cord provides a chassis ground through a
third conductor. Be certain that your power outlet is of the threeconductor type with the correct pin connected to earth ground.
Turns off after 1 hour of
restore the display.
LED indicates power is on.
Green = normal operation.
Amber = display is screen saver mode.
Move the cursor to a menu item.
Select the highlighted menu item.
Toggle between singlemultiple-channel view.
Access front panel command menu.
Select an output channel to control.
Turn the outputs on or off.
Enter voltage or current.
Enter values.
Arrow keys increment
or decrement voltage
and current settings.
Power cord requires
ground conductor.
Includes +/−output and
+/− sense terminals.
Connector function is
user-configurable.
10/100 Base-T
Left LED indicates
activity. Right LED
indicates link integrity.
1 Quick Reference
12 Keysight N6700 User’s Guide
Front Panel Display – At a Glance
Single-channel view
Bar indicates output
polarity is reversed
Current
measurement
Press the
to toggle between
views
Operating status
Voltage and
current settings
Interface status
(IO = activity on interface)
Multiple-channel
view
Press the
to toggle between
views
Grouped-channel
view
Refer to Chapter 4,
under “System
Related Operations”
for more information
Grouped channels are addressed using the channel number of the
lowest
Double-wide view
Interface status
indicators
Err = an error has occurred (press Error key to display error message)
Lan = the LAN is connected and has been configured
IO = there is activity on one of the remote interfaces
Meter key
Meter key
Voltage
measurement
(CV = constant voltage)
Voltage and Current measurements
The highlighted channel is the active channel
Channels 2 through 4 are connected in parallel and have been
configured or grouped to act as a single, higher-power channel
-
channel in the group
Channel 2 is a double-wide power module that occupies two channel
locations in the mainframe
Quick Reference 1
Keysight N6700 User’s Guide 13
Operating status
indicators
OFF = the output is off
CV = the output is in constant voltage mode
CC = the output is in constant current mode
CP+ = the output is
CP
V
C
OV =
OV
OC = the output is disabled by the over
OT = the over
PF = the output is disabl
OSC = the output is disabled by the oscillation protection
INH = the output is disabled by an external inhibit signal
UNR = the output is unregulated
PROT = the output is disabled by a condition from a coupled channel
Front Panel Keys – At a Glance
System keys
Menu
Back
Meter
Channel
HelpError
Meter
Menu
Channel
Back
Help
Error
Navigation keys
Sel
The Arrow keys let you move around in the command menus.
The Select k
It also lets you enter edit mode for numeric parameters.
Output keys
On/Off
Voltage
Current
On/Off
All
Voltage
Current
Number keys
Enter
3
E
+/-
.
2
0
1
45
6
987
The 0 through 9 keys enter numbers. The (.) key is the decima
The +/
The E key enters an exponent. Add the value to the right of the E.
The
The
set
The Enter key enters a value. If you exit a field without pressing the Enter
key, the value is ignored.
– = the output is limited (or disabled) by the negative power limit
L+/– = the output is in positive or negative voltage limit mode
L+/– = the output is in positive or negative current limit mode
– = the output is disabled by the negative over-voltage protection
limited (or disabled) by the positive power limit
the output is disabled by the over-voltage protection
-current protection
-temperature protection has tripped
ed by a power-fail condition
returns the display to metering mode.
accesses the command menu.
selects or highlights a channel to control.
backs out of a menu without activating any changes.
accesses information about the displayed menu control.
displays any error messages in the error queue.
This key is only active in Single- channel or Multiple-channel view.
backspace key deletes digits as it backspaces over them.
arrow keys increment or decrement the voltage or current
tings. They are also used to select letters in alphabetic entry fields.
ey lets you make a selection in the command menus.
controls the selected output (or all outputs when
is lit).
lets you change the voltage setting of the selected channel.
lets you change the current setting of the selected channel.
l point.
− key is only used to enter a minus sign.
1 Quick Reference
14 Keysight N6700 User’s Guide
Front Panel Menu Reference
NOTE
Menu Command
Control Description
Menu commands that appear grayed-out on the front panel are either not
available for the power module, or are password protected.
Output Voltage Programs voltage setting, limits, and ranges.
Current Programs current setting, limits, and ranges.
Mode Programs output priority mode on Models N678xA SMU.
Sequence Delay Programs Turn-on /Turn off delay.
Couple Couples output channels for output on/off synchronization.
Advanced Slew Voltage Programs voltage slew rate.
Current Programs current slew rate on Models N678xA SMU.
Power Programs the power allocation function.
Pol Lets you reverse the polarity of the output and sense terminals.
Resistance Programs output resistance on Models N6781A, N6785A.
Bandwidth Programs output voltage bandwidth on Models N678xA SMU.
Tmode Programs turn-on/turn-off impedance on Models N678xA SMU.
Measure Range Selects voltage and current measurement range.
Sweep Specifies measurement points, time interval, and trigger offset.
Window Selects measurement window: Rectangular, Hanning.
Input Selects Auxiliary voltage measurements on Models N6781A, N6785A.
Control Lets you abort a measurement in progress.
Transient Mode Selects voltage or current transient mode: Fixed, Step, List.
Step Programs voltage and current step value. Enables step triggers.
List Pace Specifies Dwell or Trigger paced list.
Repeat Specifies number of list repetitions, or specifies continuous list.
Terminate Specifies list settings when the list terminates.
Config Configures list step voltage, current, dwell, and trigger signals.
Reset Aborts the list and resets all list parameters.
Control Initiates, Triggers, or Aborts output triggers. Displays trigger state.
Protect OVP Configures over-voltage protection function.
OCP Configures over-current protection function.
Inhibit Configures the external inhibit signal: Off, Latching, Live
Coupling Disables ALL output channels when a protection fault occurs.
Wdog Configures the output watchdog timer.
Osc Enables/disables oscillation protection on Models N678xA SMU.
Clear Clears output protection. Displays output state.
States Reset Resets the instrument to its reset (*RST) state.
SaveRecall Saves or recalls an instrument state.
PowerOn Selects the power-on state: *RST, RCL0.
Quick Reference 1
Keysight N6700 User’s Guide 15
Menu Command
Control Description
System IO LAN ActiveSettings Displays the LAN interface settings that are presently active.
Config IP Configures the IP addressing of the instrument.
Name Configures the Dynamic DNS and NetBIOS naming service.
Domain Configures the Domain Name.
DNS Configures the DNS server.TCP Configures the TCP keepalive function. Reset Resets the LAN interface settings to the factory-shipped state.
USB Status Displays status, speed, packets received, and packets sent.
Identification USB connect string - the instrument’s unique USB identifier.
GPIB Selects the GPIB address.
DigPort Pins<1>Function Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut, FaultOut. Pins<2>Function Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut. Pins<3>Function Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut, InhibitIn.
Pins<4-7> Function Specifies the pin function: DigIn, DigIO, TrigIn, TrigOut, OnC, OffC.
Pins<1-7> Polarity Specifies the pin polarity: Positive, Negative
Data Sends/reads data from the digital I/O port
Groups Defines groups of output channels that are connected in parallel.
Preferences Display Contrast Configures the display contrast.
Saver Configures the screen saver and wake-on I/O timer.
View Selects 1-channel or 4-channel view at turn-on
Keys Enables/disables key clicks and configures the On/Off key.
Lock Locks front panel keys. Enter a password to unlock the front panel.
Admin Login/Logout Enter a password to access the admin functions.
Cal Volt Vprog Calibrates High and Low voltage ranges. Vlim Calibrates voltage limit High and Low ranges
Vmeas Calibrates High, Low, and Aux voltage measurement ranges.
Curr Iprog Calibrates High and Low current ranges.
Ilim Calibrates current limit.
Imeas Calibrates High and Low current measurement ranges. Misc CMRR Calibrates common mode rejection ratio.
Dprog Calibrates the downprogrammer.
Ipeak Calibrates I peak.
Resistance Calibrates output resistance High and Low ranges.
Date Saves the calibration date for each channel.
Save Saves the calibration data.
LAN Enables/disables the LAN interface and the built-in Web server.
USB Enables/disables the USB interface.
Nvram Resets all non-volatile RAM settings to their factory defaults.
Password Changes the password for the admin functions.
About Frame Displays model, serial number, and firmware revisions.
Module Displays model, serial number, options, voltage, current, power.
1 Quick Reference
16 Keysight N6700 User’s Guide
SCPI Command Summary
Subsystem Commands
NOTE
SCPI Command
Description
ABORt
:ACQuire (@chanlist)
Resets the measurement trigger system to the Idle state
:ELOG (@chanlist)
Stops the external data log
:TRANsient (@chanlist)
Resets the transient trigger system to the Idle state
CALibrate
:CURRent
[:LEVel] <NRf>, (@channel)
Calibrates the output current programming
:LIMit
:NEGative <NRf>, (@channel)
Calibrates the negative current limit (only on N6783A)
:POSitive <NRf>, (@channel)
Calibrates the positive current limit (only on N678xA SMU)
:MEASure <NRf>, (@channel)
Calibrates the current measurement
:PEAK (@channel)
Calibrates the peak current limit (only on N675xA, N676xA)
:DATA <NRf>
Enters the calibration value
:DATE <”date”>, (@channel)
Sets the calibration date
:DPRog (@channel)
Calibrates the current downprogrammer
:LEVel P1 | P2 | P3
Advances to the next calibration step
:PASSword <NRf>
Sets the numeric calibration password
:RESistance 20| 6, (@channel)
Calibrates the output resistance (only on N6781A, N6785A)
:SAVE
Saves the new cal constants in non-volatile memory
:STATE <Bool> [,<NRf>]
Enables/disables calibration mode
:VOLTage
[:LEVel] <NRf>, (@channel)
Calibrates the output voltage programming
:CMRR (@channel)
Calibrates common mode rejection ratio (only N675xA, N676xA)
:LIMit
:POSitive <NRf>, (@channel)
Calibrates the positive voltage limit (only on N678xA SMU)
:MEASure <NRf>, (@channel)
Calibrates the voltage measurement
:AUXiliary (@channel)
Calibrates the auxiliary voltage measurement (only on N6781A, N6785A)
DISPlay
[:WINDow]
:CHANnel <channel>
Selects the channel in 1-channel meter view
:VIEW METER1 | METER4
Selects 1-channel or 4-channel meter view
FETCh
(Fetch commands only on N676xA, N678xA SMU and Option 054)
[:SCALar]
:CURRent
[:DC]? (@chanlist)
Returns the average current
:ACDC? (@chanlist)
Returns the total rms current (AC + DC)
:HIGH? (@chanlist)
Returns the high level of a current pulse
:LOW? (@chanlist)
Returns the low level of a current pulse
:MAXimum? (@chanlist)
Returns the maximum current
:MINimum? (@chanlist)
Returns the minimum current
:POWer
[:DC]? (@chanlist)
Returns the average output power
:VOLTage
[:DC]? (@chanlist)
Returns the average voltage
:ACDC? (@chanlist)
Returns the total rms voltage (AC + DC)
:HIGH? (@chanlist)
Returns the high level of a voltage pulse
:LOW? (@chanlist)
Returns the low level of a voltage pulse
:MAXimum? (@chanlist)
Returns the maximum voltage
:MINimum? (@chanlist)
Returns the minimum voltage
Some [optional] commands have been included for clarity. All settings commands
have a corresponding query. Not all commands apply to all models
.
Quick Reference 1
Keysight N6700 User’s Guide 17
SCPI Command
Description
FETCh (continued)
:ARRay
:CURRent [:DC]? (@chanlist)
Returns the instantaneous output current
:POWer [:DC]? (@chanlist)
Returns the instantaneous output power
:VOLTage [:DC]? (@chanlist)
Returns the instantaneous output voltage
:ELOG <NR1>, (@chanlist)
Returns the most recent external data log records
FORMat
[:DATA] ASCII | REAL
Returns data as ASCII or binary
:BORDer NORMal | SWAPped
Sets the byte order of the external data log data
INITiate
[:IMMediate]
(Acquire command only on N676xA, N678xA SMU and Option 054)
:ACQuire (@chanlist)
Enables the measurement system to receive triggers
:ELOG (@chanlist)
Enables external data log measurements
:TRANsient (@chanlist)
Enables the output transient system to receive triggers
:CONTinuous
:TRANsient <Bool>, (@chanlist)
Enables/disables continuous transient triggers
MEASure
[:SCALar]
:CURRent
[:DC]? (@chanlist)
Takes a measurement; returns the average current
:ACDC? (@chanlist)
Takes a measurement; returns the total rms current (AC + DC)
:HIGH? (@chanlist)
Takes a measurement; returns the high level of a current pulse
:LOW? (@chanlist)
Takes a measurement; returns the low level of a current pulse
:MAXimum? (@chanlist)
Takes a measurement, returns the maximum current
:MINimum? (@chanlist)
Takes a measurement, returns the minimum current
:POWer
[:DC]? (@chanlist)
Takes a measurement, returns the average output power
:VOLTage
[:DC]? (@chanlist)
Takes a measurement; returns the average voltage
:ACDC? (@chanlist)
Takes a measurement; returns the total rms voltage (AC + DC)
:HIGH? (@chanlist)
Takes a measurement; returns the high level of a voltage pulse
:LOW? (@chanlist)
Takes a measurement; returns the low level of a voltage pulse
:MAXimum? (@chanlist)
Takes a measurement, returns the maximum voltage
:MINimum? (@chanlist)
Takes a measurement, returns the minimum voltage
:ARRay
(Array commands only on N676xA, N678xA SMU and Option 054)
:CURRent [:DC]? (@chanlist)
Takes a measurement; returns the instantaneous output current
:POWer [:DC]? (@chanlist)
Takes a measurement; returns the instantaneous output power
:VOLTage [:DC]? (@chanlist)
Takes a measurement; returns the instantaneous output voltage
OUTPut
[:STATe] <Bool> [,NORelay], (@chanlist)
Enables/disables the specified output channel(s)
:COUPle
[:STATe] <Bool>
Enables/disables channel coupling for output synchronization
:CHANNel [<NR1> {,<NR1>}]
Selects which channels are coupled
:DOFFset <NRf>
Specifies a maximum delay offset to synchronize output changes
:MAX
:DOFFset?
Returns the maximum delay offset required for a mainframe
:DELay
:FALL <NRf+>, (@chanlist)
Sets the output turn-off sequence delay
:RISE <NRf+>, (@chanlist)
Sets the output turn-on sequence delay
:PMODe VOLTage | CURRent, (@chanlist)
Sets the mode for turn on/off transitions (N6761A, N6762A)
:TMODe HIGHZ | LOWZ, (@chanlist)
Specifies the turn-on/turn-off impedance (only on N678xA SMU)
:INHibit
:MODE LATChing | LIVE | OFF
Sets the remote inhibit input
:PON
:STATe RST | RCL0
Programs the power-on state
1 Quick Reference
18 Keysight N6700 User’s Guide
SCPI Command
Description
:PROTection
:CLEar (@chanlist)
Resets latched protection
:COUPle <Bool>
Enables/disables channel coupling for protection faults
Connecting the Auxiliary Voltage Measurement Input ................. 44
This chapter describes how to install your power system. It discusses
rack mounting and line cord connections.
This chapter also discusses how to connect your load to the output
terminals. It discusses what you need to know about wire sizes and how
to compensate for voltage drops in the load leads. It describes various
loads configurations and how to connect the output terminals in series
and parallel.
Before installing the instrument, check the list under “Items Supplied”
and verify that you have received these items with your instrument. If
anything is missing, please contact your nearest Keysight Sales and
Support Office.
2 Installation
24 Keysight N6700 User’s Guide
General Information
Models
Keysight Model
Description
Options
Mainframe
Options
Description
Power Module Options
N6700B / N6701A / N6702A 400 W / 600 W / 1200W MPS Mainframe - without power modules
N6710B / N6711A / N6712A Build-to-order Modular Power System – mainframe with installed power modules
N6731B / N6741B 50 W / 100 W 5 V DC Power Module
N6732B / N6742B 50 W / 100 W 8 V DC Power Module
N6733B / N6743B / N6773A 50 W / 100 W / 300 W 20 V DC Power Module
N6734B / N6744B / N6774A 50 W / 100 W / 300 W 35 V DC Power Module
N6735B / N6745B / N6775A 50 W / 100 W / 300 W 60 V DC Power Module
N6736B / N6746B / N6776A, N6777A 50 W / 100 W / 300 W 100 V DC Power Module
N6751A / N6752A 50 W / 100 W High-Performance Autoranging DC Power Module
N6753A, N6754A / N6755A , N6756A 300 W / 500 W High-Performance Autoranging DC Power Module
N6761A / N6762A 50 W / 100 W Precision DC Power Module
N6763A, N6764A / N6765A, N6766A 300 W / 500 W Precision DC Power Module
N6781A, N6782A, N6784A 20 W Source/Measure Unit (SMU)
N6785A, N6786A 80 W Source/Measure Unit (SMU)
N6783A-MFG / N6783A-BAT 18 W / 24 W Application-Specific DC Power Module
0L1 English Manual Set. Contains User’s Guide and Service Guide. Also available as part number 5969-2939.
908 Rack Mount Kit. For mounting in a 19-inch EIA rack cabinet. Also available as Model N6709A.
FLR Filler module. For mainframes with less than four power modules. Also available as Model N6708A.
054 High-Speed Test Extensions. Includes digitized output measurements and output list capability.
Available for Models N673xB,- 4xB,-5xA, -7xA. Included with Models N676xA, N678xA SMU, and N6783A.
NOTE 1
760
761
UK6 Commercial calibration with test results data
1A7 ISO 17025 calibration certificate
2UA 200 microampere measurement range with output disconnect relays. Only on Models N6761A, N6762A.
J01 Tracking overvoltage protection function. Only available on Models N6752A, N6754A, and N6762A when
Output disconnect/polarity reversal. Disconnects the + and – output and sense terminals. Switches the
+ and – output and sense polarities. Not available on N6741B, N6751A, N6752A, N676xA, or N678xA.SMU.
NOTE 1
Output disconnect. Disconnects + and – output and sense terminals. Available for all power modules.
installed in an N6700B, N6701A, or N6702A mainframe.
1
A small AC network is always present across the output terminals.
Installation 2
Keysight N6700 User’s Guide 25
Items Supplied
Mainframe Items
Description
Part Number
Power Module Items
Inspecting the Unit
Power Cord A power cord suitable for your location. Call Keysight Sales & Support Office
Ferrite Core for N6700B Installs on power cord to reduce common mode currents. Keysight 9170-2131
Digital Connector plug 8-pin connector for connecting signal lines to the digital port. Keysight 1253-6408
Phoenix Contact MC 1,5/8-ST-3,5
Product Reference CD-ROM Includes drivers and documentation. Keysight 5969-2914
Automation-Ready CD-ROM Contains Keysight IO Libraries Suite. Keysight E2094N
Quick Reference Guide Contains quick reference information. Keysight 5969-2950
T-10 Torx tool Torx tool for installing or removing power modules. Keysight 8710-2416
8 A Output Connector plug One 8 A, 8-pin connector plug for connecting power and sense
leads. Only used in N678xA SMU.
12 A Output Connector plug One 12 A, 4-pin connector plug for connecting power and sense
leads. Used in all except N6731B, N6741B, N6753A-N6756A,
N6763A-N6766A, N6773A, N678xA SMU.
20 A Output Connector plug One 20 A, 4-pin connector plug for connecting power and sense
leads. Only used in N6731B, N6741B, N6754A, N6756A,
N6764A, N6766A, N6773A.
50 A Output Connector plug One 50 A, 2-pin connector plug for connecting power leads. Only
used in N6753A, N6755A, N6763A, N6765A.
AUX Measurement connector
plug
Small Sense Jumpers Two small jumpers for local sensing at the output connector.
Large Sense Jumpers Two large jumpers for local sensing at the output connector. Only
Sense Connector A 4-pin connector for connecting sense leads. Wires (p/n 5185-
Module Cal. Certificate A certificate of calibration referenced to the serial number. N/A
A 2-pin connector plug for connecting the auxiliary measurement
inputs. Only used in N6781A and N6785A.
Used in all except N6731B, N6741B, N6753A-N6756A, N6763AN6766A, N6773A, N678xA SMU.
used in N6731B, N6741B, N6754A, N6756A, N6764A, N6766A,
N6773A.
8847) are used for local sensing. Only used in N6753A, N6755A,
N6763A, N6765A.
Keysight 1253-6408
Phoenix Contact MC 1,5/8-ST-3,5
Keysight 1253-5826
Phoenix Contact MSTB 2,5/4-STF
Keysight 1253-6211
Phoenix Contact PC 4/4-ST-7,62
Keysight 1253-7187
Molex 39422-0002
Keysight 1253-8485
Phoenix Contact FMC 1,5/2-ST-3,5
Keysight 8120-8821
Phoenix Contact EPB 2-5(1733169)
Keysight 0360-2935
Phoenix Contact 3118151
Keysight 1253-5830
Phoenix Contact MC 1,5/4-ST-3,5
When you receive your power system, inspect it for any obvious damage
that may have occurred during shipment. If there is damage, notify the
shipping carrier and nearest Keysight Sales and Support Office
immediately. Refer to www.keysight.com/find/assist
.
Until you have checked out the power system, save the shipping carton
and packing materials in case the unit has to be returned. Check the list
under “Items Supplied” and verify that you have received these items
with your instrument. If anything is missing, please contact your nearest
Keysight Sales and Support Office.
2 Installation
26 Keysight N6700 User’s Guide
Installing the Unit
Safety Considerations
Environment
WARNING
Do not operate the instrument in the presence of flammable gasses or
fumes
Cleaning
WARNING
SHOCK HAZARD To prevent electric shock, unplug the unit before
cleaning.
Power Module Channel Assignment
lowest
lowest
This power system is a Safety Class 1 instrument, which means it has a
protective earth terminal. That terminal must be connected to earth
ground through a power source equipped with a ground receptacle.
Refer to the Safety Summary page at the beginning of this guide for
general safety information. Before installation or operation, check the
power system and review this guide for safety warnings and instructions.
Safety warnings for specific procedures are located at appropriate places
throughout this Guide.
The environmental conditions of the instrument are documented in
Appendix A. Basically, the instrument should only be operated indoors in
a controlled environment.
The dimensions of your instrument as well as an outline diagram are
given in Appendix A. A fan cools the power system by drawing air
through the sides and exhausting it out the side and back. The
instrument must be installed in a location that allows sufficient space at
the sides and back of the unit for adequate air circulation.
Use a dry cloth or one slightly dampened with water to clean the
external case parts. Do not use detergent or chemical solvents. Do not
attempt to clean internally.
The slot location of a power module in the mainframe determines the
channel assignment of the module. When viewed from the rear, the
module next to the GPIB connector is always output channel one.
Numbering continues sequentially to the left, from 1 up to 4.
Double-wide power modules are assigned the number of the
numbered slot in which is installed. For example, if a double-wide module
is installed in slots 3 and 4, it is assigned channel number 3.
Grouped power modules, those that are connected in parallel and have
been configured or grouped to act as a single higher-power channel, are
assigned the channel number of the
numbered slot of the group.
Installation 2
Keysight N6700 User’s Guide 27
Power Module Installation
NOTE
CAUTION
Tools required:
Firmware Note:
Step 1.
Step 2.
The information in this section applies if you have purchased an N6700
mainframe without the power modules installed, or if you are adding a power
module to the mainframe.
Turn the mainframe off and disconnect the power cord before installing or
removing power modules. Observe all standard electrostatic discharge
precautions before handling electronic components.
Modules must be installed next to one another, starting with slot 1. Do not leave
any empty slots between modules, otherwise the power system will not operate.
Any remaining unused slots must have a filler module installed to ensure proper
cooling. Do not install filler modules between power modules.
T10 Torx driver;
Small flat-blade screwdriver
Newer power modules can only be installed in N6700
mainframes with the latest firmware. Refer to the “Updates” section in
the front of this manual for more information. If your mainframe has the
latest firmware version, install the power module. If not, download and
install the latest version firmware from the web.
Remove the blower cover. Remove the screws from the top and sides of
the blower cover. Tilt the cover up and slide it out.
To install a power module, align the module over the pins and push it
down onto the mainframe connector.
2 Installation
28 Keysight N6700 User’s Guide
Step 3.
Step 4.
Rack Installation
CAUTION
You cannot use support rails for rack mounting your instrument.
Tools required:
Step 1.
2a
3
4
5
6
1
2b
2c
2d
1
Use a T10 Torx driver and install the screws at each end of the power
module. Because the RFI strips apply upward pressure, continue pushing
down on the module until the screws are tight.
Replace the blower cover when finished. Carefully fit the spring clips
under the lip of the power modules.
Support rails would block the airflow needed for cooling.
Use Rack Mount kit (Option 908) to rack mount your instrument.
The Rack Mount Kit is also available by ordering part number N6709A.
Keysight N6700 MPS mainframes can be mounted in a 19-inch EIA rack
cabinet. They are designed to fit in one rack-unit (1U) of space. Do not
block the air intake and exhaust at the sides of the unit, or the exhaust at
the rear of the unit.
Phillips driver, T22 Torx driver, T10 Torx driver
Install eight clip-nuts on the rack frame (2 in each corner) where your
instrument will be located.
Installation 2
Keysight N6700 User’s Guide 29
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Bench Installation
CAUTION
Do not block the air intake and exhaust at the sides, or the exhaust at
the rear of the unit. Refer to the outline diagram in Appendix A.
400 Hz Operation
Redundant Ground Requirement
Power Factor
Install the two front ears and the two rear extender supports on the
instrument as shown in the figure. Use six M3 x 8mm screws (a) for the
front ears and four M3 x 6mm screws (b) for the extender supports. If the
standard extender supports are either too short or too long, use the
longer supports (c). Cut the supports if required (d).
Install the two rear ears on the back of the instrument rack as shown in
the figure. Use four plain 10-32 screws to install the rear ears.
Slide the instrument into the rack, making sure that the rear extender
supports are aligned inside the rear ears.
Attach the front ears to the front of the instrument rack using the four
dress 10-32 screws provided.
This is optional. Insert a plain 10-32 screw through the slot of the rear
ear and extender support. Attach it with a clip-nut. Note that this will
prevent the unit from being slid out of the front of the rack.
Minimum clearances for bench operation are 2 inches (51 mm) along the
sides and back.
At 400 Hz AC input operation, the leakage current of the unit exceeds
3.5 mA. This requires the installation of a permanent, redundant ground
from the instrument chassis to earth ground. This ensures that ground
will always be connected and that any leakage current will be diverted to
ground. Refer to the Service Guide for installation instructions.
Refer to Appendix A for power factor statistics at 400 Hz operation.
2 Installation
30 Keysight N6700 User’s Guide
Connecting the Line Cord
WARNING
FIRE HAZARD Use only the power cord that was supplied with your
instrument. Using other types of power cords may cause overheating of
the power cord, resulting in fire.
SHOCK HAZARD The power cord provides a chassis ground through a
third conductor. Be certain that your power outlet is of the threeconductor type with the correct pin connected to earth ground.
Keysight N6702A Mainframe Note:
NOTE
Connect the power cord to the IEC 320 connector on the rear of the unit.
If the wrong power cord was shipped with your unit, contact your
nearest Keysight Sales and Support Office.
The AC input on the back of your unit is a universal AC input. It accepts
nominal line voltages in the range of 100 VAC to 240 VAC. The frequency
can be 50 Hz, 60 Hz, or 400 Hz.
nominal 100-120 VAC cannot supply enough current to power the
N6702A mainframe when it is operated at its full rated power.
Nevertheless, the N6702A can be connected to an AC mains circuit
rated at nominal 100-120 VAC. In this case, internal circuits will limit the
power available to modules to 600 W. As a result of this power limiting,
the current drawn from the AC mains will be < 15 A, so that standard
100-120 VAC mains circuits will not be overloaded.
The detachable power cord may be used as an emergency disconnecting
device. Removing the power cord will disconnect AC input power to the
unit.
Standard AC mains circuits rated at
Installation 2
Keysight N6700 User’s Guide 31
Connecting the Outputs
WARNING
SHOCK HAZARD Turn off AC power before making rear panel
connections. All wires and straps must be properly connected with the
terminal block screws securely tightened.
CAUTION
TIGHTEN
SCREWS
+
LOAD
+
+S +LS -LS -S
50A
SENSE
50 A
CONNECTOR
TWIST LEADS
INSERT WIRES
LOCKING
SCREW
SENSE
JUMPERS
INSTALLED
FOR LOCAL
SENSING
12A & 20 A
CONNECTOR
+S + -S
LOAD
TWIST
LEADS
+
LOCKING
SCREW
INSERT
WIRES
- - G + + +SG -S
8A CONNECTOR
SENSE JUMPERS
INSTALLED FOR
LOCAL SENSING
LOAD
+ -
Disconnect the connector plug to make your wire connections. The
8A connector plug accepts wires sizes from AWG 14 to AWG 30. The
12A connector plug accepts wires sizes from AWG 12 to AWG 30. The
20A connector plug accepts wires sizes from AWG 10 to AWG 24. The
50A connector plug accepts wires sizes from AWG 6 to AWG 20. Wire
sizes smaller than AWG 20 are not recommended. Connect the load
wires to the + and - terminals. Connect the sense wires to the +s and -s
terminals. Sense jumpers are provided for local sensing.
Securely fasten all wires by tightening the screw terminals. Insert the
connector plug into the back of the unit. Secure the 12 A and 50 A
connector by tightening the locking screws. A chassis ground binding
post is located next to the AC input connector for ground connections.
Part number information for all connector plugs is provided under “Items
Supplied” at the beginning of this chapter.
On power modules with the 50A sense connector, the +LS and –LS
terminals are ONLY used for local sense connections as illustrated. Do
not connect these terminals in any other way.
2 Installation
32 Keysight N6700 User’s Guide
Wire Size
WARNING
FIRE HAZARD Select a wire size large enough to carry short-circuit
current without overheating (refer to the table below). To satisfy safety
requirements, load wires must be heavy enough not to overheat while
carrying the short-circuit output current of the unit. Keysight Model
N678xA SMU wiring requirements are described on the following page.
Wire size
Current-carrying capacity in Amps
for stranded copper wire
Resistance
Max. Length to Limit Voltage to 1 V/Lead
for 5 A for 10 A for 20A for 50
A
AWG
2 wires bundled
4 wires bundled
Ω/foot
Wire length in feet
20 x x
30 15 x
50 25 x
80 40 20
63 30
50
80
6
94
83
0.0004
504
252
126
50
Area in mm2
2 wires bundled
4 wires bundled
Ω/meter
Wire length in meters
x x
x x
10 5 x
1.5
15.0
13.3
0.0137
14.6
7.2 x x
2.5
23.5
20.8
0.0082
24.4
12.2
6.1
x
4
30.1
26.6
0.0051
39.2
19.6
9.8
3.9
6
37.6
33.2
0.0034
58
29
14.7
5.9
10
59.2
52.3
0.0020
102
51
25
10.3
Along with conductor temperature, you must also consider voltage drop
when selecting wire sizes. The following table lists the resistance for
various wire sizes and the maximum lengths to limit the voltage drop to
1.0 V per lead for various currents.
Note that the minimum wire size required to prevent overheating may
not be large enough to prevent over-voltage tripping or maintain good
regulation. Under most conditions, the load wires should also be heavy
enough to limit the voltage drop to no more than l.0 V per lead.
To help prevent nuisance tripping of the over-voltage circuit, select a
wire size sufficient to handle the FULL output current of the unit no
matter what the intended load current or current limit setting
20
18
16
14
12
10
8
0.5
0.75
1
7.8
14.5
18.2
29.3
37.6
51.7
70.5
7.8
9.4
12.7
Load lead resistance is also an important factor relating to the CV
stability of the instrument when remote sensing capacitive loads. If high
capacitance loads are expected, you should not use wire gauges heavier
than 12 to 14 AWG for long runs of load lead.
6.9
12.8
16.1
25.9
33.2
45.7
62.3
6.9
8.3
11.2
0.0102
0.0064
0.0040
0.0025
0.0016
0.0010
0.0006
0.0401
0.0267
0.0200
125
200
320
5
7.4
100
160
x
x
x
x
x
20
32
x
x
x
Notes: 1. Capacity for AWG wires derived from MIL-W-5088B. Max. ambient temp: 55°C. Max. wire temp: 105°C.
2. Capacity for metric wires are derived from IE Publication 335-1.
3. Capacity of aluminum wire is approximately 84% of that listed for copper wire.
4. “x” indicates wire is not rated for the maximum output current of the power module.
5. Because of wire inductance considerations, it is also recommended that you keep your load leads twisted, tie wrapped, or
bundled together and less than 50 feet (14.7 meters) in length per lead.
Installation 2
Keysight N6700 User’s Guide 33
Keysight N678xA SMU Wiring Requirements
NOTE
To module connector
Cable Type
Length in
feet
Length in
meters
High Bandwidth Modes with Remote Sensing
C
L
4
5
1
2
3
L
< 15 cm
+ s
- s
+
-
N678xA
Because of the effect of wire inductance, the wire length information
given in the previous table does not apply to Keysight Models N678xA
SMU.
To minimize the effect of wire inductance, the following table describes
the allowable load lead and wire length for several common output wire
types. Using longer (or shorter) wire lengths than those indicated in the
table may cause output oscillation.
Twisted pair (AWG 14 or
smaller)
50 ohm coaxial (RG-58) 2 to 10 ft 0.6 to 3 m
10 ohm coaxial (inductance per
cable foot ≤ 32 nH)
1 to 4.25 ft 0.3 to 1.3 m
8.5 to 33 ft 2 to 10 m
The following wiring requirements apply when using Keysight Models
N678xA SMU in the High bandwidth modes with remote sensing.
Refer to chapter 4 under “Output Bandwidth” for more information about
the bandwidth settings.
1) Load wires must be twisted-pair or coax and must not be twisted
along with the sense wires. Refer to the above table for length (L).
2) Sense wires must be twisted-pair or coax and must not be twisted
with the load wires.
3) No capacitors are allowed within the sense-compensated load path.
4) If the load capacitor (C
) is not located at the sense point, the
L
distance from the sense point to the load capacitor cannot exceed
15 cm and must be twisted-pair, coax, or pc traces.
2 Installation
34 Keysight N6700 User’s Guide
Low Bandwidth Mode with Remote or Local Sensing
Guard Connection
2
1
- -
G
+ +
+S
G
-S
GUARD
- +
w
h
5) If the test fixture consists of pc traces, the positive and negative
traces should be directly facing on adjacent layers.
To minimize inductance, the width (w) of the traces should be at least as great as the thickness of the dielectric (h). It is better to
make the traces much wider than this minimum requirement in order
to minimize the DC resistance.
All previously stated wiring requirements still apply in Low bandwidth
mode except for the following.
The 15 cm maximum limit between the sense point and the load
capacitor (see #4) does not apply when using Low bandwidth mode.
1. N678xA SMU
connector
2. Guard shield
(can be the
shield of a
coaxial cable)
The purpose of a cable guard is to eliminate the effects of leakage
current that can exist in the current path of the external test circuit. The
cable guard can be used when the test fixture requires guarding and the
power system is sourcing or measuring DC currents under
1 μA. Without a guard, leakage currents in the test circuit could affect
the accuracy of the micro-amp measurements. Guarding is generally not
required when measuring currents 1 μA and greater.
As shown below, cable guards are available at the output connector of
Keysight Models N678xA SMU. The guard is typically used to drive the
shields of cables and test fixtures. It provides a buffered voltage that is at
the same potential as the + output terminals of the module connector.
The guard current is limited to about 300 μA.
Installation 2
Keysight N6700 User’s Guide 35
Multiple Loads
+S + -S
LOAD
LOAD
+ +
SENSE JUMPERS
INSTALLED FOR
LOCAL SENSING
+
TWIST
LEADS
LOAD
+
50 A
CONNECTOR
12A & 20 A
CONNECTOR
+S +LS -LS -S
SENSE
JUMPERS
INSTALLED
FOR LOCAL
SENSING
50A SENSE
-
LOAD
+ -
- - G + + +SG -S
TWIST
LEADS
8A CONNECTOR
LOAD
+
LOAD
- - +
If you are using local sensing and are connecting multiple loads to one
output, connect each load to the output terminals using separate
connecting wires as shown in the following figure.
This minimizes mutual coupling effects and takes full advantage of the
power system's low output impedance. Keep each pair of wires as short
as possible and twist or bundle them to reduce lead inductance and
noise pickup.
Note that Keysight Models N678xA SMU have additional wiring
restrictions as discussed under “Keysight N678xA SMU Wiring
Requirements”.
If load considerations require the use of distribution terminals that are
located away from the instrument, connect the output terminals to the
remote distribution terminals by a pair of twisted or bundled wires.
Connect each load to the distribution terminals separately. Remote
voltage sensing is recommended under these circumstances. Sense
either at the remote distribution terminals or, if one load is more
sensitive than the others, directly at the critical load.
2 Installation
36 Keysight N6700 User’s Guide
Remote Sense Connections
WARNING
SHOCK HAZARD Turn off AC power before making or changing rear
panel connections.
CAUTION
LS terminals. These are dedicated for local
+S + -S
TWIST
LEADS
LOAD
+
+
LOAD
+
50
A SENSE
TWIST
PAIR
50
A
CONNECTOR
12A
&
20 A
CONNECTOR
TWIST
PAIR
+S
+LS
-
LS -
S
- -
G + + +
S
G
-
S
LOAD
+
TWIST
LEADS
8A CONNECTOR
Remote sensing improves the voltage regulation at the load by
monitoring the voltage there instead of at the output terminals. This
allows the power system to automatically compensate for the voltage
drop in the load leads. Remote sensing is especially useful for CV
operation with load impedances that vary or have significant lead
resistance. It has no effect during CC operation. Because sensing is
independent of other power system functions, remote sensing can be
used regardless of how the power system is programmed.
Connect the unit for remote sensing by first disconnecting the straps
between sense and load terminals. Make your connections as shown in
the following figure. Connect the load to the output terminals using
separate connecting wires. Keep the wire-pair as short as possible and
twist or bundle it to reduce lead inductance and noise pickup. Keep load
leads under 14.7 meters (50 feet) per lead because of inductance
effects.
Connect the sense leads as close to the load as possible. Do NOT bundle
the sense wire-pair together with the load leads; keep the load wires and
sense wires separate. Note that the sense leads carry only a few
milliamperes of current and can be a lighter gauge than the load leads.
However, note that any voltage drop in the sense leads can degrade the
voltage regulation of the instrument. Try to keep the sense lead
resistance less than about 0.5Ω per lead (this requires 20 AWG or
heavier for a 50 foot length).
Note that Keysight Models N678xA SMU require remote sensing when
using any of the High output bandwidth modes discussed in Chapter 4.
Also, these models have additional wiring restrictions as discussed under
“Keysight N678xA SMU Wiring Requirements”.
When remote sensing on power modules with the 50A sense connector,
do not connect the +LS and –
sensing only.
Installation 2
Keysight N6700 User’s Guide 37
Open Sense Leads
Over-voltage Protection Considerations
Output Noise Considerations
The sense leads are part of the output's feedback path. Connect them in
such a way so that they do not inadvertently become open circuited. The
power system includes protection resistors that reduce the effect of
open sense leads during remote-sensing operation. If the sense leads
open during operation, the power system returns to the local sensing
mode, with the voltage at the output terminals approximately 1% higher
than the programmed value.
You must take into account any voltage drop in the load leads when
setting the over-voltage trip point. This is because the OVP circuit
senses at the output terminals and not at the sense terminals. Due to
the voltage drop in the load leads, the voltage sensed by the OVP circuit
could be higher than the voltage being regulated at the load.
Note that for Keysight Models N678xA SMU only, the OVP circuit senses
at the 4-wire sense terminals rather than at the output terminals. This
allows for more precise overvoltage monitoring directly at the load.
Since incorrect sense terminal wiring could defeat this feature, there is
also a backup local OVP function.
The local OVP function tracks the programmed OVP setting and trips if
the voltage at the + and - output terminals rises more than 1.5 V above
the programmed OVP setting. The local OVP also trips if the voltage at
the + and - output terminals exceeds 7.5 V on the 6 V range and 21.5 V
on the 20 V range.
Any noise picked up on the sense leads will appear at the output
terminals and may adversely affect CV load regulation. Twist the sense
leads or use a ribbon cable to minimize the pickup of external noise. In
extremely noisy environments it may be necessary to shield the sense
leads. Ground the shield at the power system end only; do not use the
shield as one of the sensing conductors.
The noise specifications documented in the Keysight N6700 Modular
Power System Family Specifications Guide apply at the output terminals
when using local sensing. However, voltage transients may be produced
at the load by noise induced in the leads or by load current transients
acting on the inductance and resistance of the load lead. If it is desirable
to keep voltage transient levels to a minimum, place an aluminum or
tantalum capacitor, with an approximate value of 10 µF per foot (30.5
cm) of load lead, right across the load.
2 Installation
38 Keysight N6700 User’s Guide
Parallel Connections
CAUTION
OUTPUT 2
OUTPUT 1
+S + -S
LOAD
+S + -S
WITH LOCAL SENSING
+
OUTPUT 1
+S + -S
OUTPUT 2
+S + -S
WITH REMOTE SENSING
TWIST
LEADS
LOAD
+
SENSE
JUMPERS
INSTALLED
TWIST LEADS
SENSE
JUMPERS
INSTALLED
WITH LOCAL SENSINGWITH REMOTE SENSING
SENSE
JUMPERS
INSTALLED
++
OUTPUT 1OUTPUT 3
LOAD
+
TWIST LEADS
+S +LS -LS -S
++
OUTPUT 1OUTPUT 3
LOAD
+
TWIST
LEADS
+S +LS -LS -S+S +LS -LS -S+S +LS -LS -S
Only connect outputs that have identical voltage and current ratings in parallel.
Keysight Models N678xA SMU may be paralleled, but ONLY when operated in
Current Priority mode. Voltage Priority operation is not allowed.
Connecting outputs in parallel provides a greater current capability than
can be obtained from a single output.
The following figures show how to connect two outputs in parallel. The
figure on the left illustrates local sensing. If voltage drop in the load
leads is a concern, the figure on the right shows how to connect the
sense leads directly at the load. Note that in both cases, the remote
sense terminals must be connected.
The following figure shows the connections for 50A power modules.
Installation 2
Keysight N6700 User’s Guide 39
The following figure shows the paralleled connections for N678xA SMU
Grouping the Outputs
Effect on Specifications
Current
All parallel specifications referring to current are twice the single output
specification except for programming resolution, which is the same for bot
single output and parallel output operation.
Voltage
All parallel specifications referring to voltage are the same as for a single
output except for CV load effect, CV load cross regulation, CV source effect,
and CV short term drift. These are all twice
(including the percentage portion) at all operating points.
Load Transient
Recovery Time
Load transient specifications are typically twice the single output.
OUTPUT 2OUTPUT 1
TWIST LEADS
LOAD
+
SENSE JUMPERS
INSTALLED FOR
LOCAL SENSING
− − G + + +S G -S− − G + + +S G -S
power modules. Note that remote sensing is not normally used in
Current Priority mode.
Once outputs have been connected in parallel, they can be configured or
“grouped” to act as a single, higher-power channel. This applies when
programming via the front panel or using SCPI commands. How to
group output channels that have been connected in parallel is discussed
in Chapter 4 under “System-Related Operations”. The output grouping
function is not available for N678xA SMU power modules.
If you are not grouping output channels, first program both outputs to
the desired output voltage. Then program the current limit of each
output. In Current Priority mode, program the output current of each
output to one half of the total desired output current. Set the voltage
limit to a value higher than the expected output voltage.
Specifications for outputs operating in parallel can be obtained from the
specifications for single outputs. Most specifications are expressed as a
constant or as a percentage (or ppm) plus a constant. For parallel
operation, the percentage portion remains unchanged while constant
portions or any constants are changed as indicated below. For current
readback accuracy and temperature coefficient of current readback, use
the minus current specifications:
h
the voltage programming accuracy
2 Installation
40 Keysight N6700 User’s Guide
Series Connections
WARNING
SHOCK HAZARD Floating voltages must not exceed 240 VDC. No
output terminal may be more than 240 VDC from chassis ground.
CAUTION
OUTPUT 2
OUTPUT 1
+S + -S
+S + -S
WITH REMOTE SENSING
SENSE
JUMPER
INSTALLED
OUTPUT 2OUTPUT 1
+S + -S
TWIST LEADS
LOAD
+S + -S
WITH LOCAL SENSING
+
TWIST LEADS
SENSE
JUMPERS
INSTALLED
SENSE
JUMPERS
INSTALLED
LOAD
+
Only connect outputs that have identical voltage and current ratings in
series. Keysight Models N678xA SMU and N6783A–x cannot be
connected in series.
To prevent currents from damaging the power system when the load is
connected, always turn series-connected outputs on and off together.
Do not leave one output on while the other is off.
Connecting outputs in series provides a greater voltage capability than
can be obtained from a single output. Because the current is the same
through each element in a series circuit, outputs connected in series
must have equivalent current ratings.
The following figures show how to connect two outputs in series to a
single load. If voltage drop in the load leads is a concern, connect the
sense leads of output 1 and output 2 for remote sensing as shown in the
figure on the right. Note that the +sense lead of output 1 must remain
connected to the -sense terminal of output 2.
The following figure shows the connections for 50A power modules.
Installation 2
Keysight N6700 User’s Guide 41
Setting the Outputs
Outputs connected together in series cannot be grouped
NOTE
Effect on Specifications
Voltage
single output.
Current
the percentage portion) at all operating points.
Load Transient
Recovery Time
WITH LOCAL SENSINGWITH REMOTE SENSING
SENSE
JUMPERS
INSTALLED
LOAD
OUTPUT 1OUTPUT 3
LOAD
+
SENSE
JUMPER
INSTALLED
TWIST LEADS
+
TWIST LEADS
+
+
+S +LS -LS -S
OUTPUT 1OUTPUT 3
+
+
+S +LS -LS -S
+S +LS -LS -S
+S +LS -LS -S
.
To program outputs connected in series, first program the current limit
of each output to the total desired current limit point. Then program the
voltage of each output so that the sum of both voltages equals the total
desired operating voltage. The simplest way to accomplish this is to
program each output to one half of the total desired operating voltage.
The operating mode of each output is determined by the output’s
programmed settings, operating point, and load condition. Because
these conditions may change during series operation, the front panel
status indicator will reflect these changes. This is normal. Momentary
status changes are also normal.
Specifications for outputs operating in series can be obtained from the
specifications for single outputs. Most specifications are expressed as a
constant or a percentage (or ppm) plus a constant. For series operation,
the percentage portion remains unchanged while constant portions or
any constants are changed as indicated.
All series specifications referring to voltage are twice the single output
specification except for programming resolution, which is the same as for a
All series specifications referring to current are the same as for a single output
except for CC load effect, CC load cross regulation, CC source effect, and CC
short term drift. These are twice the current programming accuracy (including
Load transient specifications are typically twice the single output.
2 Installation
42 Keysight N6700 User’s Guide
Additional Load Considerations
Response Time with an External Capacitor
Positive and Negative Voltages
NOTE
Protecting Sensitive Loads from AC Power Switching Transients
NOTE
When programming with an external capacitor, voltage response time
may be longer than that for purely resistive loads. Use the following
formula to estimate the additional up-programming response time:
Response Time = (Added Output Capacitor)X(Change in Vout)
(Current Limit Setting)−(Load Current)
Note that programming into an external output capacitor may cause the
power system to briefly enter constant current or constant power
operating mode, which adds additional time to the estimation.
Either positive or negative voltages with respect to ground can be
obtained from the output by grounding (or "commoning") one of the
output terminals. Always use two wires to connect the load to the output
regardless of where or how the system is grounded. The instrument can
be operated with any output terminal ± 240 VDC including output
voltage from ground.
Keysight Models N678xA SMU are optimized for grounding the negative
output terminal. Grounding the positive terminal may result in increased
current measurement noise and a reduction in current measurement
accuracy.
This only applies if you are connecting loads that are highly sensitive to
voltage or current transients to the output of the power system. If your
load is connected directly to the output of the power system and is not
connected to chassis ground in any way, you do not need to worry about
AC power switching transients appearing at the output of the power
system.
Operating the AC line switch can inject common mode current spikes
into the DC output leads, resulting in voltage spikes that may damage
loads that are highly sensitive to voltage or current transients. Note that
any electronic device meeting international standards for EMI
compliance is likely to generate similar current spikes. This situation
arises from the presence of EMI filters at both the AC input and the DC
output. These filters typically include common mode capacitors
connected to the chassis of the power system. Since the AC input has an
earth ground, any load that is also earth-grounded provides a possible
return path for common mode currents.
The following figure illustrates a typical situation where a load that might
otherwise be floating becomes grounded, thereby providing a return
Installation 2
Keysight N6700 User’s Guide 43
NOTE
always
+S
+
-S
+
N6700 Modular
Power System
Scope
probe
1
3
2
path for any injected currents. In this case, the return path is created by
the low side of the scope probe, which is connected to the load circuit
common and also to the scope’s chassis. For this and similar cases, the
following steps by order of preference, will help mitigate common mode
current spikes appearing at the output when the power system is turned
on or off by the AC line switch:
1Install a ferrite core (Keysight p/n 9170-2131) on the power cord to
insert additional impedance in the current path. This ferrite core is now
installed inside N6701A and N6702A mainframes.
2Install a separate “bonding” wire from the load’s common point, to
the ground terminal of the power system. This provides a lower
impedance path that helps direct injected currents away from the
DC output leads (and the sensitive load).
3Break the return path through the external equipment. For example,
instead of the single-ended scope shown in the figure, you can use a
differential scope with a floating input or you can connect an
isolated measuring instrument to the load.
Disconnecting the load from the output before switching the power
system on or off will
protect the load from common mode
currents.
2 Installation
44 Keysight N6700 User’s Guide
Connecting the Auxiliary Voltage Measurement Input
NOTE
CAUTION
– – G + + –S G +S
+
–
DC voltage
+/- 60 VDC max
This information only applies to Keysight Models N6781A and N6785A.
The auxiliary voltage measurement input is located on the rear panel of
the Keysight N6781A and N6785A. It is primarily used for battery voltage
rundown measurements, but it is also suitable for general purpose DC
measurements.
The auxiliary voltage measurement input is isolated from other
commons. It has a bandwidth of about 2 kHz. It has one input range: −20
to +20 VDC.
As shown in the following figure, auxiliary voltage measurements cannot
be made on test points that are at a greater potential than ±60 VDC from
ground. Refer to chapter 4 under “Making Measurements” for more
information.
When using the auxiliary voltage measurement input, no output terminal
or measurement input terminal may be more than ± 60 VDC from any
other terminal and chassis ground.
3
Getting Started
NOTE
Ready CD included with this
Turning the Unit On ........................................................................ 46
Selecting an Output Channel ......................................................... 46
Entering an Output Voltage Setting .............................................. 46
Entering a Current Limit Setting .................................................... 47
Enabling the Output ....................................................................... 47
Using the Front Panel Menu .......................................................... 48
Connecting to the Interfaces ......................................................... 50
Communicating Over the LAN ....................................................... 57
Securing the Interfaces .................................................................. 59
This chapter describes how to get started using your power system. It
discusses turning the unit on, using the front panel controls, and
navigating the front panel command menu. A map of the front panel
menu structure is found in Chapter 1.
This chapter also contains information on how to configure the three
remote interfaces that are provided on the back of the instrument.
Detailed information on configuring the remote interfaces is included in
the Keysight Technologies USB/LAN/GPIB Interfaces Connectivity Guide, which is available on the Automationproduct.
3 Getting Started
46 Keysight N6700 User’s Guide
Turning the Unit On
Err
Selecting an Output Channel
Channel
Channel
Entering an Output Voltage Setting
Method 1 – Use the Navigation and Arrow Keys
Navigation Keys
Sel
Arrow Keys
Method 2 - Use the Voltage key to enter a value
Voltage
Voltage
NOTE
Back
Meter to return to
After you have connected the line cord, turn the unit on with the front
panel power switch. The front panel display will light up after a few
seconds.
A power-on self-test occurs automatically when you turn the unit on. This
test assures you that the instrument is operational. If the self-test fails,
the front panel
list of errors on the front panel. Refer to the Service Guide for further
information.
When the front panel display appears, you can use the front panel
controls to enter voltage and current values.
indicator comes on. Press the Error key to display the
Press
to select the output channel that you wish to program.
Use the left and right navigation keys to navigate to the setting that
you wish to change. In the display below, channel 1’s voltage setting
is selected. Enter a value using the numeric keypad. Then press Enter.
You can also use the arrow keys to adjust the value up or down, and
switch between + and − limits on Model N6784A. When the output is
on and the unit is operating in CV mode, the output voltage changes
immediately. Otherwise, the value will become effective when the
output is turned on.
Press
channel 1’s voltage setting is selected. Enter the desired setting using
the numeric keypad. Then press Enter.
to select the voltage entry field. In the display below,
If you make a mistake, either use the backspace key to delete the
number, press
meter mode.
to back out of the menu, or press
Getting Started 3
Keysight N6700 User’s Guide 47
Entering a Current Limit Setting
Method 1 – Use the Navigation and Arrow Keys
Navigation Keys
Sel
Arrow Keys
Method 2 - Use the Current key to enter a value
Current
NOTE
Back
Meter to return to
Enabling the Output
Use the On/Off key to enable the output
NOTE
Use the left and right navigation keys to navigate to the setting that
you wish to change. In the display below, channel 1’s current setting
is selected. Enter a value using the numeric keypad. Then press Enter.
You can also use the arrow keys to adjust the value up or down and
switch between + and − limits on Models N678xA SMU. When the
output is on and the unit is operating in CC mode, the output current
changes immediately. Otherwise, the value will become effective when
the output is turned on.
Current
On/Off
Press
channel 1’s current setting is selected. Enter the desired setting using
the numeric keypad. Then press Enter.
If you make a mistake, either use the backspace key to delete the
number, press
meter mode.
If a load is connected to the output, the front panel display will
indicate that it is drawing current. Otherwise, the current reading will
be zero. The status indicator next to the channel number indicates the
output’s status. In this case, the output channel is in constant voltage
mode.
to select the current entry field. In the display below,
to back out of the menu, or press
For a description of the status indicators, refer to Chapter 1, under
“Front Panel Display – At a Glance”.
3 Getting Started
48 Keysight N6700 User’s Guide
Using the Front Panel Menu
Menu
Sel
Help
Set the Over-Voltage Protection
Menu
Menu
Sel
Sel
Sel
Sel
The front panel command menu lets you access most of the power
system’s functions. The actual function controls are located at the lowest
menu level. Briefly:
Press the
Press the navigation keys to move across the menu commands.
Press the center (
the next level in the menu.
Press the
information about the function controls.
A map of the front panel command structure is found in Chapter 1. The
following example shows you how to navigate the front panel command
menu to program the over-voltage protection function.
The over-voltage protection function turns off the affected output if the
output voltage reaches the programmed over-voltage limit.
Press
identifies the output channel that is being controlled followed by the
menu path. Since the top level is displayed, the path is empty.
The second line indicates the commands that are available at the
present menu level. In this case, the top-level menu commands are
shown, with the Output command highlighted.
The third line indicates which commands are available under the
Output command. Selecting the highlighted command accesses this
lower level.
key to access the command menu.
) key to select a command and move down to
key at the lowest menu level to display help
to access the front panel command menu. The first line
Press the right arrow key to traverse the menu until the Protect
command is highlighted. Press
to select the Protect command.
The menu path now shows that the commands shown on the second
line are located under the Protect command. The OVP command is
highlighted. The third line indicates which functions are located under
the OVP command. Press
to select the OVP command.
Getting Started 3
Keysight N6700 User’s Guide 49
Sel
Channel
Channel
NOTE
Exiting the Command Menu
Meter
Back
Back
In Case of Trouble
Err
4 4 Enter
The command menu is now at the function control level. This is the
lowest level in this path.
Use the navigation keys to highlight the OVP Level control as shown
below. Enter the desired over-voltage level using the numeric keypad.
Then press Enter.
Press
can save time because you can directly access the OVP control of
each channel without having to navigate through the menu levels.
If you program an over-voltage protection level that is lower than the
present output voltage, the over-voltage protection circuit will trip and
turn the output off. The front panel status indicator will show OV.
at any time to select a different output channel. This
There are two ways to exit the command menu.
Meter
Press
quickest way to return to metering mode.
Press
This method may be more convenient if there are other menu
commands to be given.
to immediately return to the metering screen. This is the
to back up one level at a time in the command menu.
Detailed instructions on how to use the power system’s functions and
capabilities are found in the next chapter. Detailed information about the
SCPI programming commands are found in the Programmer’s Reference
Help file on your Keysight N6700 Product Reference CD.
Press the Help key to obtain additional help about any function control
menu level. Press the Back key to exit the Help menu.
The front panel
operating problems occur with your instrument. Press the Error key to
display the list of errors. Refer to the N6700 Service Guide for further
information.
The N6700 Service Guide is included as part of the optional Manual Set
(Option 0L1). An electronic copy of the N6700 Service Guide is also
included on the N6700 Product Reference CD-ROM.
indicator comes on if self-test fails or if other
3 Getting Started
50 Keysight N6700 User’s Guide
Connecting to the Interfaces
Lan
GPIB Interface
NOTE
System\IO\GPIB
The Keysight N6700 MPS supports GPIB, LAN, and USB interfaces. All
three interfaces are live at power-on. Connect your interface cable to the
appropriate interface connector. Information on configuring the
interfaces is found later in this chapter.
The front panel IO indicator comes on whenever there is activity on the
remote interfaces.
port is connected and configured.
Power system mainframes provide Ethernet connection monitoring. With
Ethernet connection monitoring, the instrument’s LAN port is continually
monitored, and automatically reconfigured when the instrument is
unplugged for a minimum of 20 seconds and then reconnected to a
network.
For detailed information about GPIB interface connections, refer to the
Keysight Technologies USB/LAN/GPIB Interfaces Connectivity Guide,
located on the Automation-Ready CD that is shipped with your product.
The front panel
indicator comes on when the LAN
The following steps will help you quickly get started connecting your
instrument to the General Purpose Interface Bus (GPIB). The following
figure illustrates a typical GPIB interface system.
1If you have not already done so, install the Keysight IO Libraries
Suite from the Automation-Ready CD that is shipped with your
product.
2If you do not have a GPIB interface card installed on your computer,
turn off your computer and install the GPIB card.
3Connect your instrument to the GPIB interface card using a GPIB
interface cable.
4Use the Connection Expert utility of the Keysight IO Libraries Suite
to configure the installed GPIB interface card’s parameters.
5The power system is shipped with its GPIB address set to 5. Use the
front panel menu if you need to change the GPIB address.
a Press the Menu key, then use the navigation keys to select
b Use the numeric keys to enter a new value. Valid addresses are
from 0 to 30. Press the Enter key to enter the value. Press the
Meter key to exit the menu.
.
Getting Started 3
Keysight N6700 User’s Guide 51
USB Interface
NOTE
System\IO\USB\Identification
LAN Interface
NOTE
6You can now use Interactive IO within the Connection Expert to
communicate with your instrument, or you can program your
instrument using the various programming environments.
For detailed information about USB interface connections, refer to the
Keysight Technologies USB/LAN/GPIB Interfaces Connectivity Guide,
located on the Automation-Ready CD that is shipped with your product.
The following steps will help you quickly get started connecting your
USB-enabled instrument to the Universal Serial Bus (USB). The following
figure illustrates a typical USB interface system.
1If you have not already done so, install the Keysight IO Libraries
Suite from the Automation-Ready CD that is shipped with your
product.
2 Connect your instrument to the USB port on your computer.
3 With the Connection Expert utility of the Keysight IO Libraries Suite
running, the computer will automatically recognize the instrument.
This may take several seconds. When the instrument is recognized,
your computer will display the VISA alias, IDN string, and VISA
address. This information is located in the USB folder.
4Note that you can also view the instrument’s VISA address from the
front panel. Press the Menu key, then use the navigation keys to
select
5You can now use Interactive IO within the Connection Expert to
communicate with your instrument, or you can program your
instrument using the various programming environments.
For detailed information about LAN interface connections, refer to the
Keysight Technologies USB/LAN/GPIB Interfaces Connectivity Guide,
located on the Automation-Ready CD that is shipped with your product.
.
The following steps will help you quickly get started connecting and
configuring your instrument on a local area network. The two types of
local area networks connections that are discussed in this section are
site networks and private networks.
3 Getting Started
52 Keysight N6700 User’s Guide
Connecting to a Site LAN
Lan
NOTE
NOTE
Connecting to a Private LAN
A site LAN is a local area network in which LAN-enabled instruments and
computers are connected to the network through routers, hubs, and/or
switches. They are typically large, centrally-managed networks with
services such as DHCP and DNS servers.
1If you have not already done so, install the Keysight IO Libraries
Suite from the Automation-Ready CD that is shipped with your
product.
2Connect the instrument to the site LAN. The factory-shipped
instrument LAN settings are configured to automatically obtain an IP
address from the network using a DHCP server (DHCP is set On).
Note that this may take up to one minute. The DHCP server will
register the instrument’s hostname with the dynamic DNS server.
The hostname as well as the IP address can then be used to
communicate with the instrument. The front panel
come on when the LAN port has been configured.
indicator will
If you need to manually configure any instrument LAN settings, refer to
“Configuring the LAN Parameters” later in this chapter for information
about configuring the LAN settings from the front panel of the
instrument.
3Use the Connection Expert utility of the Keysight IO Libraries Suite
to add the N6700 power system and verify a connection. To add the
instrument, you can request the Connection Expert to discover the
instrument. If the instrument cannot be found, add the instrument
using the instrument’s hostname or IP address.
If this does not work, refer to the chapter on “Troubleshooting
Guidelines” in the Keysight Technologies USB/LAN/GPIB Interfaces Connectivity Guide.
4You can now use Interactive IO within the Connection Expert to
communicate with your instrument, or you can program your
instrument using the various programming environments. You can
also use the Web browser on your computer to communicate with
the instrument as described under “Using the Web Server” later in
this chapter.
A private LAN is a network in which LAN-enabled instruments and
computers are directly connected, and not connected to a site LAN.
Getting Started 3
Keysight N6700 User’s Guide 53
NOTE
Lan
NOTE
NOTE
They are typically small, with no centrally-managed resources.
1If you have not already done so, install the Keysight IO Libraries
Suite from the Automation-Ready CD that is shipped with your
product.
2Connect the instrument to the computer using a LAN crossover
cable. Alternatively, connect the computer and the instrument to a
standalone hub or switch using regular LAN cables.
Make sure your computer is configured to obtain its address from DHCP and
that NetBIOS over TCP/IP is enabled. Note that if the computer had been
connected to a site LAN, it may still retain previous network settings from
the site LAN. Wait one minute after disconnecting it from the site LAN before
connecting it to the private LAN. This allows Windows to sense that it is on a
different network and restart the network configuration. If you are running
Windows 98, you may need to manually release the previous settings.
3The factory-shipped instrument LAN settings are configured to
automatically obtain an IP address from a site network using a
DHCP server. You can leave these settings as they are. Most
Keysight products and most computers will automatically choose an
IP address using auto-IP if a DHCP server is not present. Each
assigns itself an IP address from the block 169.254.nnn. Note that
this may take up to one minute. The front panel
come on when the LAN port has been configured.
Turning off DHCP reduces the time required to fully configure a network
connection when the power system is turned on. To manually configure the
instrument LAN settings, refer to “Configuring the LAN Parameters” later in
this chapter.
4Use the Connection Expert utility of the Keysight IO Libraries Suite
to add the N6700 power system and verify a connection. To add the
instrument, you can request the Connection Expert to discover the
instrument. If the instrument cannot be found, add the instrument
using the instrument’s hostname or IP address.
If this does not work, refer to the chapter on “Troubleshooting Guidelines” in
the Keysight Technologies USB/LAN/GPIB Interfaces Connectivity Guide.
5You can now use Interactive IO within the Connection Expert to
communicate with your instrument, or you can program your
instrument using the various programming environments. You can
also use the Web browser on your computer to communicate with
the instrument as described under “Using the Web Server” later in
this chapter.
indicator will
3 Getting Started
54 Keysight N6700 User’s Guide
Viewing the Active LAN Settings
System\IO\LAN\ActiveSettings
Modifying the LAN Settings
NOTE
for any LAN setting modifications to
System\IO\LAN\Config
Config
Reset
IP
Automatic
on networks that do not have a DHCP server.
Manual
fields only appear when Manual is selected.
IP Address
by periods. Each decimal number ranges from 0 through 255.
Subnet Mask
different subnet, all packets must be sent to the Default Gateway.
Default
Gateway
indicates that no default gateway is defined.
To view the currently active LAN settings, press the Menu key, then use
the navigation keys to select:
The currently active settings for the IP Address, Subnet Mask, and
Default Gateway may be different from the front panel configuration
menu settings - depending on the configuration of the network. If the
settings are different, it is because the network has automatically
assigned its own settings.
The power system must be rebooted
take effect.
As shipped from the factory, the power system’s pre-configured settings
should work in most LAN environments. If you need to manually
configure these settings, press the Menu key, then use the navigation
keys to select:
In the
Name, Domain, DNS, TCP, and Reset. Note that the
resets the LAN settings to the factory-shipped state.
menu you can then select from the following items: IP,
.
.
command
Select IP to configure the addressing of the instrument. The configurable
parameters include:
This parameter automatically configures the addressing of the
instrument. When selected, the instrument will first try to obtain an
IP address from a DHCP server. If a DHCP server is found, the DHCP
server will assign an IP address, Subnet Mask, and Default Gateway
to the instrument. If a DHCP server is unavailable, the instrument will
try to obtain an IP address using AutoIP. AutoIP automatically
assigns an IP address, Subnet Mask, and Default Gateway addresses
This parameter allows you to manually configure the addressing of
the instrument by entering values in the following three fields. These
This value is the Internet Protocol (IP) address of the instrument. An
IP address is required for all IP and TCP/IP communications with the
instrument. An IP Address consists of 4 decimal numbers separated
This value is used to enable the instrument to determine if a client IP
address is on the same local subnet. When a client IP address is on a
This value is the IP Address of the default gateway that allows the
instrument to communicate with systems that are not on the local
subnet, as determined by the subnet mask setting. A value of 0.0.0.0
Getting Started 3
Keysight N6700 User’s Guide 55
Name
Name
Host name
A-N6700B-45678 is an example of a hostname.
Use Dynamic DNS
naming service
Use NetBIOS
naming service
Domain
Domain
Domain name
DNS
DNS
Obtain DNS server
from DHCP
must have enabled DHCP in the IP menu.
Use the following
DNS server
specific DNS server.
DNS Server
using DHCP or if you need to connect to a specific DNS server.
Select
to configure the hostname of the instrument. If you want to
change the hostname, you should do so before you connect the
instrument to the network. Otherwise, the original hostname may be
cached in the network for up to several hours.
This field registers the supplied name with the selected naming
service. If the field is left blank, no name is registered. A hostname
may contain upper and lower case letters, numbers and dashes(-).
The maximum length is 15 characters. Use the navigation keys to
enter an alpha character. Use the up/down navigation or arrow keys
to select a letter from the alphabetic choices as you scroll through
the selections. Use the number keys to enter a number.
Each power system is shipped with a default hostname with the
format: A-modelnumber-serialnumber, where modelnumber is the
mainframe’s 6-character model number (e.g. N6700B), and
serialnumber is the last five characters of the 10-character
mainframe serial number located on the label on the top of the unit
(e.g. 45678 if the serial number is MY12345678).
Registers the hostname using the Dynamic DNS naming system.
Registers the hostname using the RFC NetBIOS naming protocol.
Select
only the hostname, but also the domain name.
Registers the Internet domain for the instrument. The Domain must
start with a letter and may contain upper and lower case letters,
numbers, dashes(-) and dots(.). Use the navigation keys to enter an
alpha character. Use the up/down navigation or arrow keys to select
a letter from the alphabetic choices as you scroll through the
selections. Use the number keys to enter a number.
if your DNS server requires an instrument to register not
Select
to configure the Domain Name System (DNS) setup of the
instrument. DNS is an internet service that translates domain names into
IP addresses. It is also needed for the instrument to find and display its
hostname assigned by the network.
Select this item to obtain the DNS server address from DHCP. You
Select this item if you are not using DHCP or need to connect to a
This value is the address of the DNS server. It is used if you are not
3 Getting Started
56 Keysight N6700 User’s Guide
NOTE
For improved performance when connected to an isolated subnet, select
Use the following DNS server
DNS server
TCP
TCP
Enable TCP
Keepalive
resources that were allocated to that client.
TCP keepalive
timeout
bandwidth. Allowed values: 720 - 99999 seconds.
Reset
. However, leave the
field blank.
address
Select
to configure the TCP keepalive settings of the instrument.
Check the Enable box to enable the TCP keepalive function. The
instrument uses the TCP keepalive timer to determine if a client is
still reachable. If there has been no activity on the connection after
the specified time, the instrument will send keepalive probes to the
client to determine if it is still alive. If not, the connection will be
marked as down or "dropped." The instrument will release any
This is the delay in seconds before TCP keepalive probes will be sent
to the client. It is recommended that the largest value be used that
still meets the application's need for unreachable client detection.
Smaller keepalive time-out values will generate more keepalive
probes (network traffic), using more of the available network
Resets the LAN settings to the factory-shipped state. These settings are
listed at the end of this chapter.
Getting Started 3
Keysight N6700 User’s Guide 57
Communicating Over the LAN
Using the Web Server
two
NOTE
pen a separate
The Keysight IO Libraries Suite along with instrument drivers for specific
programming environments can be used to communicate with your
power system. You can also communicate with your power system using
its built-in Web server, the Telnet utility, or sockets. These latter
methods are a convenient way to communicate with the power system
without using I/O libraries or drivers. In all cases, you must first establish
a LAN connection from your computer to the power system as previously
discussed.
Your power system has a built-in Web server that lets you control it
directly from an internet browser on your computer. With the Web
server, you can access the front panel control functions including the
LAN configuration parameters. Up to
allowed. With additional connections, performance will be reduced.
The built-in Web server only operates over the LAN interface. It requires
Internet Explorer 7+ or Firefox2+. You also need the Java (Sun) Plug-in.
This is included in the Java Runtime Environment. Refer to Sun
Microsystem’s website. If you are using Internet Explorer 7 o
browser window for each connection.
simultaneous connections are
The Web server is enabled when shipped. To launch the Web server:
1 Open the internet browser on your computer.
2 Enter the instrument’s hostname or IP address into the browser’s
Address field to launch the Web server. The following home page
will appear:
3Click on the Browser Web Control button in the navigation bar on
the left to begin controlling your instrument.
3 Getting Started
58 Keysight N6700 User’s Guide
Using Telnet
Using Sockets
NOTE
four
data socket
control socket
4For additional help about any of the pages, click on the Help with
this Page button.
If desired, you can control access to the Web server using password
protection. As shipped from the factory, no password is set. To set a
password, click on the View & Modify Configuration button. Refer to the
on-line help for additional information about setting a password.
In an MS-DOS Command Prompt box type: telnet hostname 5024 where
hostname is the N6700 hostname or IP address, and 5024 is the
instrument’s telnet port.
You should get a Telnet session box with a title indicating that you are
connected to the power system. Type the SCPI commands at the
prompt.
Power system mainframes allow any combination of up to
simultaneous
data socket, control socket, and telnet connections to be made.
Keysight instruments have standardized on using port 5025 for SCPI
socket services. A
receive ASCII/SCPI commands, queries, and query responses. All
commands must be terminated with a newline for the message to be
parsed. All query responses will also be terminated with a newline.
The socket programming interface also allows a
connection. The control socket can be used by a client to send device
clear and to receive service requests. Unlike the data socket, which uses
a fixed port number, the port number for a control socket varies and
must be obtained by sending the following SCPI query to the data
socket: SYSTem:COMMunicate:TCPip:CONTrol?
After the port number is obtained, a control socket connection can be
opened. As with the data socket, all commands to the control socket
must be terminated with a newline, and all query responses returned on
the control socket will be terminated with a newline.
To send a device clear, send the string “DCL” to the control socket.
When the power system has finished performing the device clear it
echoes the string “DCL” back to the control socket.
on this port can be used to send and
Service requests are enabled for control sockets using the Service
Request Enable register. Once service requests have been enabled, the
client program listens on the control connection. When SRQ goes true
the instrument will send the string “SRQ +nn” to the client. The “nn” is
the status byte value, which the client can use to determine the source
of the service request.
Getting Started 3
Keysight N6700 User’s Guide 59
Securing the Interfaces
Enable/Disable the USB, LAN, and Web Server
System\Admin\USB.
Enable USB
Check this box to enable the USB. Uncheck to disable the USB.
System\Admin\LAN.
Enable LAN
Check this box to enable the LAN. Uncheck to disable the LAN.
Enable Web
Server
server.
Password-Protecting the Interfaces, Factory Settings, and Calibration
System\Admin
System\Admin\Login
System\Admin\ Password
Restoring the Non-volatile Factory Settings
System\IO\LAN\Config\Reset
System\Admin\Nvram
The USB interface, LAN interface, and the Web server are enabled when
shipped.
To enable or disable the USB interface from the front panel, press the
Menu key and select
To enable or disable the LAN interface or Web server, press the Menu
key and select the following menu commands:
Check this box to enable the Web server. Uncheck this box to disable
the Web server. The LAN must be enabled in order to enable the Web
If you cannot access the Admin menu, it may be password protected.
You can password-protect access to the LAN and USB interfaces as well
as the non-volatile RAM reset and the calibration functions. This
capability is available in the
As shipped from the factory, the Admin menu password is 0 (zero). This
means that you do not have to enter a password to access the Admin
menu. Simply select
To password-protect the Admin menu, select
The password must be numeric, and up to 15 digits long. When done,
log out of the Admin menu to activate the password. You can now only
enter the Admin menu by providing the right password.
If the password is lost, access can be restored by setting an internal
switch to reset the password to 0. If the message “Locked out by internal
switch setting” or “Calibration is inhibited by switch setting” appears, the
internal switch is set to prevent the password from being changed (Refer
to the Service Guide).
menu.
and press Enter.
Remote interface settings are stored in non-volatile memory. The
factory-shipped interface settings documented in the following table are
optimized for connecting your power system to a site network. They
should also work well for other network configurations.
.
These factory-shipped LAN settings can be restored by selecting the
Reset control in the
All non-volatile settings including LAN, can be restored by selecting the
Reset control located in the
menu.
menu.
3 Getting Started
60 Keysight N6700 User’s Guide
Factory-shipped non-volatile LAN settings
Other factory-shipped non-volatile settings
Get IP Address
IP Address
Subnet Mask
Default Gateway
Obtain DNS server from
DHCP
DNS server
Host name
Automatic
169.254.67.0
255.255.0.0
0.0.0.0
Enabled
Blank
A-N67xxx-xxxxx Ping server
Dynamic DNS naming service Enabled
NetBIOS naming service
Domain name
TCP keepalive
TCP keepalive seconds
Ethernet Auto-negotiation
Web password
Enabled
Blank
Enabled
1800
Enabled
Enabled
Blank
Admin/Calibration password 0 (zero)
Calibration date
Channel grouping
Digital port function (all pins) Digital In
Digital port polarity (all pins) Positive
Front panel lockout
Front panel meter view
GPIB Address
Key clicks
LAN interface
March 5, 2003
No groups
Disabled
1-channel
5
Enabled
Enabled
On/Off key affects all
channels
Output Inhibit mode
Saved states
Screen contrast
Screen saver
Screen saver delay
USB interface
Wake on I/O
Web server
Disabled
Off
*RST command
50%
Enabled
60 minutes
Enabled
Enabled
Enabled
4
Operating the Power System
Programming the Output ............................................................... 62
This chapter contains examples on how to operate your power system
from the front panel and over the remote interface using SCPI
commands.
For complete details on the SCPI (Standard Commands for
Programmable Instruments) commands, refer to the Programmer’s
Reference Help file included on the Keysight N6700 Product Reference
CD. This CD-ROM is shipped along with your instrument.
The simple examples discussed in this chapter show you how to
program:
Output voltage and current functions
Output triggers
Measurement functions
Measurement triggers
Protection functions
System functions
Refer to Appendix B for information about using the Digital Port on the
back of your instrument.
Refer to Appendix C for information about using the power allocation
function.
4 Operating the Power System
62 Keysight N6700 User’s Guide
Programming the Output
Select a Channel View
Front Panel:
SCPI Command:
DISP:VIEW METER4
Select an Output Channel
Front Panel:
SCPI Command:
(@1,2)
Set the Output Voltage
Front Panel:
SCPI Command:
VOLT 10,(@1:4)
Front Panel:
SCPI Command:
VOLT:RANG 5,(@1)
to
Front Panel:
SCPI Command:
VOLT:LIM:COUP ON,(@1)
Press the Meter key to toggle
between single-channel and
multiple-channel view.
Press the Channel key to select
an output channel.
Press the Voltage key.
Enter a value and press Select.
For models with multiple ranges, you can select a lower range if you
need better output resolution.
To select single-channel view:
DISP:VIEW METER1
To set multiple-channel view:
Enter the selected channel(s) in
the command’s parameter list.
OUTP;STAT?
To set output 1 to 5 V:
VOLT 5,(@1)
To set all outputs to 10 V:
Press the Voltage key.
Select a lower range and press
Select.
For Keysight Models N678xA SMU operating in current priority mode,
you can specify a Voltage limit., which limits the output voltage at the
specified value. In current priority mode, the output current remains at
its programmed setting as long as the output voltage is within the
positive or negative limit. Check Tracking
track the positive voltage limit setting.
Press the Voltage key.
Specify a + Voltage limit and or a
− Voltage limit and press Select.
Check the Tracking box if you
want the − limit to track the +
limit.
To select the lower range,
program a value that falls within
the range:
let the negative voltage limit
To select the voltage limit:
VOLT:LIM 5,(@1)
To select the negative voltage
limit:
VOLT:LIM:NEG 3,(@1)
To enable voltage limit tracking:
Operating the Power System 4
Keysight N6700 User’s Guide 63
Set the Output Current
Front Panel:
SCPI Command:
CURR 2,(@1:4)
Front Panel:
SCPI Command:
CURR:RANG 1,(@1)
to
Front Panel:
SCPI Command:
CURR:LIM:COUP ON,(@1)
Set the Output Mode
NOTE
Press the Current key.
Enter a value and press Select.
For models with multiple ranges, you can select a lower range if you
need better output resolution.
Press the Current key.
Select a lower range and press
Select.
For Keysight Models N678xA SMU operating in voltage priority mode,
you can specify a Current limit., which limits the output current at the
specified value. In voltage priority mode, the output voltage remains at
its programmed setting as long as the load current is within the positive
or negative limit. Check Tracking
the positive current limit setting.
Press the Current key.
Specify a + Current limit and or a
− Current limit and press Select.
Check the Tracking box if you
want the − limit to track the +
limit.
To set output 1 to 1 A:
CURR 1,(@1)
To set all outputs to 2 A:
To select the lower range,
program a value that falls within
the range:
let the negative current limit track
To select the current limit:
CURR:LIM 5,(@1)
To select the negative current
limit:
CURR:LIM:NEG 3,(@1)
To enable current limit tracking:
This information applies to Keysight Models N678xA SMU only.
For Keysight Models N678xA SMU, you can select either Voltage priority
or Current priority mode.
In voltage priority mode the output is controlled by a bi-polar constant
voltage feedback loop, which maintains the output voltage at its positive
or negative programmed setting. The output voltage will remain at its
programmed setting as long as the load current remains within the
positive or negative current limit.
In current priority mode the output is controlled by a bi-polar constant
current feedback loop, which maintains the output sourcing or sinking
current at its programmed setting. The output current will remain at its
programmed setting as long as the load voltage remains within the
positive or negative voltage limit.
4 Operating the Power System
64 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
Output\Mode
NOTE
Set the Slew Rate
Front Panel:
SCPI Command:
Output\Advanced\Slew
Voltage
Current
VOLT:SLEW MAX,(@1)
Enable the Output
Front Panel:
SCPI Command:
System\Preferences\Keys
Select
Select either Voltage priority or
Current priority and press Select.
When switching between Voltage priority and Current priority, the
output is turned off and the output settings revert to their Power-on or
RST values. Refer to Appendix E for information about voltage and
current priority mode operation.
Select
Then select
Enter the voltage or current
slew rate in the Slew Rate field.
Check Max slew rate to
program the fastest slew rate.
The voltage slew rate determines the rate at which the voltage changes to a new progr ammed setting. When set to MAXimum, INFinity, or to a very
large value, the slew rate will be limited by the analog performance of
the output circuit. The slowest or minimum slew rate is modeldependent and is a function of the full scale range. For other ranges the
minimum slew rate is proportional to the full scale range.
.
or
To set output 1 to current priority:
FUNC CURR,(@1)
To set the voltage slew rate to 5 V/s
VOLT:SLEW 5,(@1)
To set the current slew rate to 1 A/s
CURR:SLEW 1,(@1)
To set the fastest slew rate:
The current slew rate control is only available on Keysight Models
N678xA SMU. It determines the rate at which the current changes to a new programmed setting. When set to MAXimum, INFinity, or to a very
large value, the slew rate will be limited by the analog performance of
the output circuit. The slowest or minimum slew rate is modeldependent and is a function of the full scale range. For other ranges the
minimum slew rate is proportional to the full scale range.
Press the On/Off key.
To enable/disable ALL outputs
using the On/Off key, select
Check On/Off affects all channels.
Because of internal circuit start-up procedures and any installed relay
options, output on may take between 35 and 50 milliseconds to
complete its function. Conversely, output off may take between 20 and
25 milliseconds to complete its function.
To mitigate these built-in delays, you can program the output to zero
volts rather than using the output on/off function.
To enable only output 1:
OUTP ON,(@1)
To enable outputs 1-4:
.
OUTP ON,(@1:4)
Operating the Power System 4
Keysight N6700 User’s Guide 65
Sequence Multiple Outputs
Front Panel:
SCPI Command:
Output\Sequence\Delay
off.
System\Preferences\Keys.
OUTP:DEL:FALL .2,(@3,4)
same
different
Front Panel:
SCPI Command:
Output\Sequence\Couple.
Max delay offset for this frame
Delay offset
OUTP:COUP:DOFF .051
Program the Output Relays
Turn-on and turn-off delays control the power-up and power-down
sequencing of the output channels in relation to each other.
Press the Channel key to select
an output. Then select
.
Select either Turn-on or TurnEnter a delay in seconds, then
press Select.
Select
Check On/Off affects all
channels.
Output turn-on characteristics vary across the power module types - DC
Power, Autoranging, Precision, and Source/Measure. When output
channels of the
sequencing is determined by the programmed turn-on delays.
When outputs of
additional offsets of a few milliseconds from one output to another that
must be accounted for. Specifying a common delay offset assures that
the programmed turn-on delays will be synchronized to start at the
completion of the common delay offset. Select the delay offset of the
slowest power module in the mainframe and use that as the common
delay offset. (See Appendix D for more information.)
module type are programmed off-to-on, output
module types are sequenced, there may be
To program a 50 millisecond turnon delay for output 1 and a 100
millisecond turn-on delay for
output 2:
OUTP:DEL:RISE .05,(@1)
OUTP:DEL:RISE .1,(@2)
To program a 200 millisecond turnoff delay for outputs 3 and 4:
In the front panel menu, select
The
field displays the delay offset of
the slowest power module in the
frame. Enter this value into the
then press Select.
Output relay availability and options are described in Chapter 1 under
“Model Differences”. Option 761 provides double-pole, double-throw
relays that disconnect both the output and sense terminals. Option 760
is the same as option 761 but adds output reversal relays. Note that a
small AC network is always present across the output terminals.
If you have Option 761 installed, the normal operating mode of the relay
is to open and close as the output is turned on or off. The relays are only
opened or closed when the output is at a safe state (zero voltage; zero
current). Note however, that you can program the output state on or off
while leaving the relay state unchanged.
field in milliseconds;
To query the delay offset of the
slowest power module in the
mainframe (the maximum delay
offset) in seconds:
OUTP:COUP:MAX:DOFF?
To specify the common delay
offset for the mainframe in
seconds:
4 Operating the Power System
66 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
OUTP ON,NOR,(@1)
Front Panel:
SCPI Command:
Output\Advanced\Pol
OUTP:REL:POL NORM,(@1)
NOTE
Set the Output Resistance
NOTE
Front Panel:
SCPI Command:
Output\Advanced\Resistance
Set the Output Bandwidth
NOTE
10.001V
Not Available To leave the relays closed when output 1 is turned off:
OUTP OFF,NOR,(@1)
To leave the relays open when output 1 is turned on:
If you have Option 760 installed, you can also reverse the polarity of the
output and sense terminals. Note that this command briefly turns the
output off while the output and sense terminal polarities are switched.
Also note that if this option is installed in Model N6742B, the maximum
output current will be limited to 10A.
Select
Then check the Reverse box.
Uncheck the Reverse box to
return the polarity to normal.
When the output polarity has been reversed, the voltage meter on the
front panel display will show a bar over the voltage reading:
This information applies to Keysight Models N6781A and N6785A only.
Output resistance programming is primarily used in battery testing
applications, and only applies in Voltage priority mode. Values are
programmed in Ohms, from – 40 mΩ to + 1 Ω.
Select
Enter a value and press Select.
To switch the output and sense
.
terminal polarities of output 1:
OUTP:REL:POL REV,(@1)
To return the polarities back to
normal:
To set the output resistance to 0.5Ω:
.
OUTP:RES 0.5,(@1)
This information applies to Keysight Models N678xA SMU only.
Keysight Models N678xA SMU have several voltage bandwidth modes to
allow you to optimize output response time with capacitive loads.
The Low bandwidth setting provides stability with a wide range of output
capacitors. Additional bandwidth modes provide faster output response
when the output capacitance is restricted to smaller values.
Operating the Power System 4
Keysight N6700 User’s Guide 67
Setting
Output
Capacitance
Sensing
Maximum distance from
sense point to capacitor
ESR
@100 kHz
NOTE
Front Panel:
SCPI Command:
Output\Advanced\Bandwidth
Set the Output Turn-Off Mode
NOTE
Low impedance
High
impedance
Front Panel:
SCPI Command:
Output\Advanced\Tmode
OUTP:TMOD HIGHZ,(@1)
If capacitive loads cause the output to oscillate on the default (Low
bandwidth) or any of the other bandwidth settings, a protection function
will detect the oscillation and latch the output off. The condition is
annunciated by the OSC status bit. At power-on the oscillation
protection function is enabled.
Select a bandwidth according to the following output capacitances and
lead lengths:
Low
High1
High2
High3
0–150 μF
0–1 μF
1–7 μF
7–150 μF
See Chapter 2 under “Keysight N678xA SMU Wiring Requirements” for
additional information on allowable load lead lengths.
Connecting capacitive loads that fall outside the indicated ranges may
result in output instability or oscillation, and may cause the output to
turn off, setting the OSC status bit.
Select
Select a bandwidth from the
selections listed and press Select.
Local or remote Full lead length (see chapter 2) 50 to 200 mΩ
Remote only 6 inches (155 mm) 50 to 200 mΩ
Remote only 6 inches (155 mm) 50 to 200 mΩ
Remote only 6 inches (155 mm) 50 to 200 mΩ
To select the bandwidth:
.
VOLT:BWID HIGH1,(@1)
This information applies to Keysight Models N678xA SMU only.
This lets you specify high impedance or low impedance mode at output
turn-on and turn-off.
output is programmed to the set value. At turn-off the output is first
programmed to zero, after which the output relays are opened.
which the output relays are closed. At turn-off the output relays are
opened while the output remains at its set value. This reduces current
pulses that may be undesirable in some applications.
Select
Select either High Impedance or
Low impedance and press Select.
- At turn-on the output relays are closed after which the
– At turn-on the output is programmed to the set value after
To set output 1 to a high
.
impedance mode:
4 Operating the Power System
68 Keysight N6700 User’s Guide
Synchronizing Output Steps
1.
2.
3.
4.
Enable the Output to Respond to Trigger Commands
Front Panel:
SCPI Command:
Transient\Mode
CURR:MODE STEP,(@1)
NOTE
Set the Voltage or Current Trigger Levels
same
Front Panel:
SCPI Command:
Transient\Step
The transient system lets you step the output voltage and current up or
down in response to triggered events. To generate a triggered output
step you must:
Enable the output to respond to trigger commands.
Set the voltage or current trigger levels.
Select the transient trigger source.
Initiate the trigger system and provide a trigger signal.
First, you must enable the output to respond to trigger commands.
Unless an output is enabled to respond to triggers, nothing will happen
even if you have programmed a trigger level and generated a trigger for
the output.
Use the following commands to enable an output to respond to triggers:
Select
For voltage step triggering, set the
Voltage mode to Step. For current
step triggering, set the Current
mode to Step. Then press Select.
In Step mode, the triggered value becomes the immediate value when
the trigger is received. In Fixed mode, trigger signals are ignored; the
immediate values remain in effect when a trigger is received.
.
Next, use the following commands to program an output trigger level.
The output will go to this level when the trigger is received.
If you have a model that has multiple ranges, the selected triggered
voltage and current settings must be within the
output channel is presently operating in.
To enable the voltage function
on output 1 to respond to
triggers, use:
VOLT:MODE STEP,(@1)
To enable the current function
on output 1 to respond to
triggers, use:
range that the
Select
Select the Trig Voltage box to
set the voltage. Select the Trig
Current box to set the current.
Enter a value and press Select.
.
To set a voltage and current
trigger level for output 1 use:
VOLT:TRIG 15,(@1)
CURR:TRIG 1,(@1)
Operating the Power System 4
Keysight N6700 User’s Guide 69
Select the Transient Trigger Source
NOTE
Bus
Selects GPIB device trigger, *TRG, or <GET> (Group Execute Trigger).
Pin<n>
Trigger Input in order to be used as a trigger source (see Appendix B).
Transient<n>
Refer to “Generate Trigger Out Signals”.
Ext
Selects any pin configured as a trigger input as the trigger source.
Front Panel:
SCPI Command:
Transient\TrigSource
Transient\TrigSource
To select Transient output triggers,
Transient\TrigSource
Initiate the Transient Trigger System
Front Panel:
SCPI Command:
Transient\Control
INIT:TRAN (@1)
An immediate trigger command either from the front panel or over the
bus will generate an immediate trigger regardless of the trigger source.
Unless you are using the front panel menu or a TRIGger:TRANsient
command to trigger the output, select a trigger source from the following:
Selects a pin on the external port connector as the trigger source.
<n> specifies the pin number. The selected pin must be configured as a
Selects the output channel’s transient system as the trigger source.
<n> specifies the channel. When you select a channel, you must also
set up that channel’s transient system to generate a trigger out signal.
Use the following commands to select a trigger source:
To select Bus triggers, select
. Select Bus.
To select Digital pin triggers,
select
select one of the digital port pins.
select
select one of the output channels.
Next, you must initiate or enable the transient trigger system.
When the power system is turned on, the trigger system is in the idle
state. In this state, the trigger system is disabled, ignoring all triggers.
Initiating the trigger system moves it from the idle state to the initiated
state, which enables the power system to receive triggers. To initiate the
trigger system, use:
Select the
Scroll to Initiate and press Select.
. Then
. Then
.
To select Bus triggers for output 1:
TRIG:TRAN:SOUR BUS,(@1)
To select Digital pin triggers:
TRIG:TRAN:SOUR PIN<n>,(@1)
where n is the pin number.
To select Transient output triggers:
TRIG:TRAN:SOUR TRAN<n>,(@1)
where n is the output channel that
will generate the trigger signal.
To initiate the transient trigger
system:
It takes a few milliseconds for the instrument to be ready to receive a
trigger signal after receiving the INITiate:TRANsient command.
4 Operating the Power System
70 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
STAT:OPER:COND?(@1)
NOTE
Trigger the Output
Front Panel:
SCPI Command:
Transient\Control
Front Panel:
SCPI Command:
Transient\Control
ABOR:TRAN (@1)
If a trigger occurs before the trigger system is ready for it, the trigger will
be ignored. You can test the WTG_tran bit in the operation status
register to know when the instrument is ready to receive a trigger after
being initiated.
Not Available
If a bit value of 16 is returned in the query, the WTG_tran bit is true, and
the instrument is ready to receive the trigger signal. Refer to the N6700
Programmer’s Reference Help file for more information.
Unless INITiate:CONTinuous:TRANsient is programmed, it will be
necessary to initiate the transient trigger system each time a triggered
action is desired.
The trigger system is waiting for a trigger signal in the initiated state.
You can immediately trigger the output as follows:
Select
Select Trigger to generate an
immediate trigger signal
regardless of the trigger source
setting.
To query the WTG_tran bit (bit 4):
.
To generate an immediate trigger
on channel 1:
TRIG:TRAN (@1)
Alternatively, if the trigger source
is BUS, you can also program a
*TRG or an IEEE-488 <get>
command
As previously discussed, a trigger can also be generated by another
output channel or by a trigger signal applied to an input pin on the
digital port connector. If any of these systems are configured as the
trigger source, the instrument will wait indefinitely for the trigger signal.
If the trigger does not occur, you must manually return the trigger
system to the idle state.
The following commands return the trigger system to the idle state:
Select
Scroll to and select Abort.
When a trigger is received, the triggered functions are set to their
programmed trigger levels. When the triggered actions are completed,
the trigger system returns to the idle state.
You can test the TRAN_active bit in the operation status register to know
when the transient trigger system has returned to the idle state.
.
Operating the Power System 4
Keysight N6700 User’s Guide 71
Front Panel:
SCPI Command:
STAT:OPER:COND?(@1)
Generate Trigger Out Signals
Front Panel:
SCPI Command:
Transient\Step
Not Available
If a bit value of 64 is returned in the query, the TRAN_active bit is true,
and the transient action is NOT complete. When the TRAN_active bit is
false, the transient action is complete. Refer to the N6700 Programmer’s
Reference Help file for more information.
Each output channel can generate trigger signals that can be used by
other output channels, or routed to a pin on the digital port that has
been configured as a trigger output (TOUT). Use the following
commands to program transient trigger signals that are generated when
an output Step occurs:
Use the Channel key to select
the channel that is the trigger
source. Select
Check Enable Trigger Output.
Then press Select.
To query the TRAN_active bit (bit 6):
To program channel 3’s step
function to generate a trigger signal,
use
.
STEP:TOUT ON,(@3)
4 Operating the Power System
72 Keysight N6700 User’s Guide
Programming Output Lists
NOTE
The List Function
NOTE
The Output List function described in this section is not available on all
models. Refer to the Test Extensions feature under “Model Differences”
in chapter 1,
Either output voltage or output current or both, may be list-controlled.
For Keysight Models N678xA SMU, only the parameters associated with
one of the priority modes (either voltage priority or current priority) may
be list controlled. List mode lets you generate complex sequences of
output changes with rapid, precise timing, which may be synchronized
with internal or external signals. Lists can contain up to 512 individually
programmed steps, and can be programmed to repeat themselves.
The voltage and current lists are paced by a separate list that defines the
duration or dwell of each step. Each of the up to 512 steps can have an
individual dwell time associated with it, which specifies the time in
seconds that the list will remain at that step before moving on to the
next step. Dwell times can be programmed from 0 to 262.144 seconds.
The default dwell time is 0.001 seconds.
If you need an output list to closely follow external events, then a
trigger-paced list is more appropriate. In a trigger-paced list, the list
advances one step for each trigger received. As previously discussed, a
number of trigger sources can be selected to generate triggers. With a
trigger-paced list, you do not need to program a dwell time for each
step. If you do program a dwell time, triggers that are received during
the dwell period are ignored.
Voltage and current lists can also be configured to generate trigger
signals at specified steps. This is accomplished by two additional lists: a
beginning-of-step (BOST) and an end-of-step (EOST) list. These lists
define which steps will generate a trigger signal and if the trigger occurs
at the beginning or end of the step. These trigger signals can be used to
synchronize other events with the list.
When either a voltage or current list is programmed, the associated
dwell, BOST, and EOST lists must all be set to the same number of steps,
otherwise an error will occur when the list is run. For convenience, a list
may be programmed with only one step or value. In this case, a singlestep list is treated as if it had the same number of steps as the other
lists, with all values being equal to the one value.
List data is not stored in non-volatile memory. This means that list data
that is sent to the instrument either from the front panel or over the bus
will be lost when the power system is turned off. However, list data can
be saved as part of a saved instrument state. Refer to “Instrument State
Storage” later in this chapter.
Operating the Power System 4
Keysight N6700 User’s Guide 73
Program an Output Pulse or Pulse Train
Step 1.
Front Panel:
SCPI Command:
Transient\Mode
VOLT:MODE LIST, (@1)
Step 2.
Front Panel:
SCPI Command:
Transient\List\Config
Step 3.
Front Panel:
SCPI Command:
Transient\List\Pace
LIST:STEP AUTO, (@1)
If you only wish to program a single pulse, skip steps 4 and 5 and go to
step 6.
Step 4.
Front Panel:
SCPI Command:
Transient\List\Config
List Count = 1+additional pulses
Trigger
10
Pulse width
Off
time
The following procedure shows how to generate an output pulse train
using the List function.
Set the voltage or current function for which you want to generate a
pulse to List mode. This example programs a voltage pulse.
Select
voltage mode to List. Press Select.
. Set the
To program output 1, use
Set the amplitude and width of the pulse. For example, to generate a
pulse with an amplitude of 15 V and a pulse width of 1 second, use:
Select
Select List Step 0 and enter a
voltage value of 15. Press Select.
.
To program output 1, use
LIST:VOLT 15, (@1)
LIST:DWEL 1, (@1)
Enter a dwell value of 1 for List
Step 0 and Press Select.
Set the list pacing to Auto, so that as each dwell time elapses, the next
step is immediately output.
Select
.
Select Dwell and press Select.
If you want to generate a pulse train, you must specify the off time
between pulses. To do this you must program another step. For a
voltage list, you must specify an amplitude and an off time. For example,
to program an off time of 2 seconds with an amplitude of 0 V between
pulses, use:
Select
Select List Step 1 and enter a
voltage value of 0. Press Select.
.
To program output 1, use
LIST:VOLT 15,0, (@1)
LIST:DWEL 1,2, (@1)
Enter a dwell value of 2 for List
Step 1 and Press Select.
4 Operating the Power System
74 Keysight N6700 User’s Guide
Step 5.
Front Panel:
SCPI Command:
Transient\List\Repeat
Step 6.
Front Panel:
SCPI Command:
Transient\List\Config
Step 7.
Front Panel:
SCPI Command:
Transient\List\Terminate
Step 8.
Front Panel:
SCPI Command:
Transient\TrigSource
TRIG:TRAN:SOUR BUS, (@1)
Step 9.
Front Panel:
SCPI Command:
Transient\Control
INIT:TRAN (@1)
Step 10.
Front Panel:
SCPI Command:
Transient\Control
*TRG
To generate a pulse train, you can simply repeat the pulse as needed.
For example, to program a pulse train of 50 pulses, use:
Select
Enter the number of list repetitions
(50) and Press Select.
Specify if you want the output pulse to generate a trigger signal that can
be used to trigger actions on other output channels or on any external
equipment connected to the digital port. For example, to generate a
trigger signal at the end of the pulse, use:
Select
Select List Step 0 and check the
Tout Step box. Press Select.
Specify the output state after the pulse has completed. For example, to
return the output to the state it was in before the pulse, use:
.
.
To program output 1, use
LIST:COUN 50, (@1)
To program a trigger at the End
of the pulse for output 1, use
LIST:TOUT:EOST 1,0, (@1)
You must program a value of 0
(no trigger) for step 1 as a
placeholder.
Select
Select Return to Start. Press
Select.
Select the trigger source that will generate the pulse or pulse train. For
example, to select Bus triggers as the trigger source, use:
Select
Select Bus and press Select.
Initiate the transient trigger system. To enable the trigger system for one
transient event or trigger use:
Select the
Select Initiate and Press Select.
Trigger the output pulse or pulse train.
Select
Select Trigger and Press Select.
.
.
.
To program output 1, use
.
LIST:TERM:LAST 0, (@1)
To program output 1, use:
To program output 1, use
Operating the Power System 4
Keysight N6700 User’s Guide 75
Program an Arbitrary List
Step 1.
Front Panel:
SCPI Command:
Transient\Mode
VOLT:MODE LIST, (@1)
Step 2.
Front Panel:
SCPI Command:
Transient\List\Config
Step 3.
Front Panel:
SCPI Command:
Transient\List\Config
NOTE
nly one value, that value will be applied to all steps in the
Step 4.
Trigger
1
List Count = 1
List Count = 2
02345
The following procedure shows how to generate the list of voltage
changes as illustrated in the following figure.
Set the function, voltage or current, for which you want to generate a list
to List mode. This example programs a voltage list.
Select
Voltage mode to List. Press Select.
. Set the
To program output 1, use
Program the list of values for the List function. The order in which the
values are entered determines the order in which the values will be
output. To generate the voltage list shown in the figure, a list may
include the following values: 9, 0, 6, 0, 3, 0
Select
Select the List Step number and
.
To program output 1, use
LIST:VOLT 9,0,6,0,3,0, (@1)
enter a voltage value. Press Select.
Repeat this for each step. Use the
keys to select the next step.
Determine the time interval, in seconds, that the output remains at each
step in the list before it advances to the next step. To specify the six
dwell intervals in the figure, a list may include the following values: 2,
3, 5, 3, 7, 3
Select
Select the List Step number and
.
To program output 1, use
LIST:DWEL 2,3,5,3,7,3, (@1)
enter a dwell value. Press Select.
Repeat this for each step. Use the
keys to select the next step.
The number of dwell steps must equal the number of voltage steps. If a
dwell list has o
list.
Determine how the list is paced. To pace the list by dwell time, set the
list pacing to Dwell-paced on the front panel menu. (Set the LIST:STEP
command to AUTO.) As each dwell time elapses, the next step is
immediately output.
4 Operating the Power System
76 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
Transient\List\Pace
LIST:STEP AUTO, (@1)
Step 5.
Front Panel:
SCPI Command:
Transient\List\Config
To generate a trigger, enter a 1 in
Repeat this for each step. Use the
Step 6.
Front Panel:
SCPI Command:
Transient\List\Terminate
LIST:TERM:LAST 1, (@1)
Step 7.
Front Panel:
SCPI Command:
Transient\List\Repeat
LIST:COUN 2, (@1)
Step 8.
1
Trigger at BOST
023451
Trigger at EOST
02345
Select
.
Select Dwell-paced. Press Select.
In a trigger-paced list, the list advances one step for each trigger
received. To enable trigger-paced lists, select Trigger-paced on the front
panel menu. (Set the LIST:STEP command to ONCE.)
The dwell time associated with each step determines the minimum time
that the output remains at the step. If a trigger is received before the
dwell time completes, the trigger is ignored. To ensure that no triggers
are lost in a trigger-paced list, set the dwell time to zero.
Specify if you want the list to generate trigger signals that can be used
to trigger actions on other output channels or on external equipment
connected to the digital port.
Select
Select the List Step number.
the Tout Begin Step or Tout End
Step field. If a zero is entered, no
trigger is generated for the step.
keys to select the next step.
.
To program a trigger at the start of
step 4 for output 1, use
LIST:TOUT:BOST 0,0,0,0,1,0,
@(1)
To program a trigger at the end of
step 0, 2, and 4 for output 1, use
LIST:TOUT:EOST 1,0,1,0,1,0,
(@1)
Specify how you want the list to terminate. For example, if you want the
list to remain at the values of the last list step when finished, use:
Select
Select Stop Last Step. Press Select.
If applicable, specify how many times you want the list to repeat.
Sending the INFinity parameter in the SCPI command makes the list
repeat indefinitely. At reset, the list count is set to 1.
Select the
Enter the number of list repetitions
(2) and Press Select.
Select a trigger source, initiate, and trigger the list. This is described in
detail under "Synchronizing Output Steps".
.
To program output 1, use
To program the output 1 list to
.
repeat 2 times, use
Operating the Power System 4
Keysight N6700 User’s Guide 77
Making Measurements
Front Panel:
SCPI Command:
MEAS:CURR?(@1)
Measurement Ranges
Front Panel:
SCPI Command:
Measure\Range
3.06 A range
0.10 A range
200 μA range (option 2UA)
Seamless Measurements
Front Panel:
SCPI Command:
Measure\Range
SENS:CURR:RANG:AUTO ON, (@1)
Each output channel has its own measurement capability. The output
voltage and current is measured by acquiring a number of samples at
the selected time interval, applying a window function to the samples,
and averaging the samples.
The power-on time interval is 20.48 microseconds. The output window
function is Rectangular.
Use the following commands to make a simple measurement:
Select the Meter key.
Some models have multiple voltage and current measurement ranges.
(Refer to Chapter 1, “Model Differences”). Selecting a lower
measurement range provides greater measurement accuracy, provided
the measurement does not exceed the range.
Select
Select the lower measurement
range from the voltage or
current dropdown menu. Then
press Select.
The maximum measurable current is the maximum rating of the range. If
the measurement exceeds the range, an “Overload” error will occur.
Examples of programming measurement ranges are:
To measure average voltage or current:
MEAS:VOLT?(@1)
.
To set the 5 V measurement range:
SENS:VOLT:RANG 5, (@1)
To set the 1 A measurement range:
SENS:CURR:RANG 1, (@1)
To select, program values > 0.1 A and ≤ 3.06 A.
To select, program values > 200 µA and ≤ 0.1 A.To select, program values ≤ 200 µA.
Seamless voltage and current measurement autoranging is available on
Keysight Models N6781A, N6782A, N6785A, and N6786A. This enables a
wide dynamic measurement range with no data lost across ranges.
Autoranging does not include the 10 μA range, which must be selected
manually.
Select
Select Auto from the voltage
or current dropdown menu.
Then press Select.
.
To enable seamless voltage or current
autoranging on channel 1:
SENS:VOLT:RANG:AUTO ON, (@1)
4 Operating the Power System
78 Keysight N6700 User’s Guide
Simultaneous Voltage and Current Measurements
Front Panel:
SCPI Command:
FETC:CURR? (@1)
Auxiliary Voltage Measurements
Front Panel:
SCPI Command:
Measure\Input
MEAS:VOLT? (@1)
NOTE
When the auxiliary voltage measurement terminals are left unconnected,
Some models have simultaneous voltage and current measurement
capability (Refer to Chapter 1, “Model Differences”). In this case BOTH
voltage and current can be acquired on any measurement.
Not available.
Keysight Models N6781A and N6785A have an auxiliary voltage
measurement input, whose primary use is for battery voltage rundown
measurements. It may also be suitable for other applications including
general purpose DC voltage measurements between +/-20 VDC. The
auxiliary voltage measurement input is isolated from other commons. It
has a bandwidth of about 2 kHz. It has one input range: −20 to +20 VDC.
Auxiliary voltage measurements cannot be made along with output
voltage measurements. When the auxiliary voltage measurement input is
selected, the voltage measurement input will be switched to the Aux
Voltage inputs instead of the normal + and − sense terminals.
Select the measurement function:
SENS:FUNC:VOLT ON,(@1)
SENS:FUNC:CURR ON,(@1)
Initiate and trigger the measurement
system:
INIT:ACQ (@1)
TRIG:ACQ (@1)
Fetch the voltage and current
measurement:
FETC:VOLT? (@1)
To enable auxiliary voltage measurements:
Select
Select Auxiliary and press Select.
Select Main to reconnect the
voltage measurement input to
the output terminals.
the front panel meter will indicate a voltage reading of approximately
1.6V. This is a normal indication which does not affect the voltage
measurement once the auxiliary measurement terminals are connected.
.
To enable auxiliary measurements:
SENS:FUNC:VOLT:INP AUX,(@1)
Take the auxiliary voltage
measurement:
Operating the Power System 4
Keysight N6700 User’s Guide 79
Using the Digitizer
NOTE
NOTE
Programming the Digitizer
Select the Measurement Function and Range
Front Panel:
SCPI Command:
SENS:FUNC:CURR ON, (@2)
Front Panel:
SCPI Command:
Measure\Range
The Digitizer functions described in this section are not available on all
models. Refer to the Test Extensions feature under “Model Differences”
in chapter 1.
The digitizer function lets you access the enhanced voltage and current
measurement capabilities of the power system. You can:
Specify a measurement function and range.
Adjust the measurement sample rate.
Select a measurement window that can attenuate AC noise.
Retrieve arrays of the digitized current or voltage measurement.
Synchronize measurements using trigger signals.
When a remote interface measurement is in progress, the front panel
display may indicate “-- -- -- -- --“. Front panel measurements resume
when the remote measurement completes.
The following commands select a measurement function. To enable the
measurement function, use:
Not Available
If a power module has simultaneous measurements (see chapter 1,
“Model Differences”), you can enable BOTH voltage and current
measurements on the same output channel.
Some power modules also have multiple measurement ranges. Selecting
a lower measurement range provides greater measurement accuracy,
provided that the measurement does not exceed the range. To select
lower measurement ranges, use:
Select
Select the lower measurement
range from the voltage or
current dropdown menu. Then
press Select.
To enable voltage measurements:
SENS:FUNC:VOLT ON, (@1)
To enable current measurements:
.
To set the 5 V measurement range:
SENS:VOLT:RANG 5, (@1)
To set the 1 A measurement range:
SENS:CURR:RANG 1, (@1)
4 Operating the Power System
80 Keysight N6700 User’s Guide
Seamless Measurements
Front Panel:
SCPI Command:
Measure\Range
SENS:CURR
(@1)
Adjust the Measurement Sample Rate
Front Panel:
SCPI Command:
Measure\Sweep
20.48 microseconds:
Up to 8 parameters (all models, with 40 µs resolution)
ACQUISITION TIME
(TIME INTERVAL X #SAMPLES - 1)
TIME INTERVAL BETWEEN SAMPLES
TRIGGER
OCCURS
MEASUREMENT
SAMPLE (POINT)
Seamless voltage and current measurement autoranging is available on
Keysight Models N6781A, N6782A, N6785A, and N6786A. This enables a
wide dynamic measurement range with no data lost across ranges.
Autoranging does not include the 10 μA range, which must be selected
manually.
Select
.
Select Auto from the voltage
or current dropdown menu.
Then press Select.
To enable seamless voltage or current
autoranging on channel 1:
SENS:VOLT:RANG:AUTO ON, (@1)
:RANG:AUTO ON,
The following figure illustrates the relationship between measurement
samples (or points), and the time interval between samples in a typical
measurement.
You can vary the measurement data sampling rate as follows:
Select
.
Enter the number of points and
press Select. Scroll to Time
Interval, enter a value and press
Select.
To set the time interval to 60µs*
with 4096 samples, use:
The maximum number of sample points that are available for all
measurements is 512 K points (K = 1024). If you specify a voltage
measurement with 500 K points on channel 1 for example, you will only
have 12 K points available for all other measurements.
Time interval values can range from 5.12 microseconds (for one
parameter on Models N678xA SMU) to 40,000 seconds. Note that the
shortest time interval (fastest speed) that can be specified depends on
the number of parameters that are being measured, the model that is
doing the measuring, and the time interval resolution.
5.12 microseconds:
10.24 microseconds:
20.48 microseconds:
1 parameter (models N678xA SMU only)
1 or 2 parameters (all models)
3 or 4 parameters (all models, with 20 µs resolution)
Operating the Power System 4
Keysight N6700 User’s Guide 81
Front Panel:
SCPI Command:
SENS:SWE:TINT:RES RES40, (@1)
Specify a Window Function
Front Panel:
SCPI Command:
Measure\Window
SENS:WIND HANN, (@1)
Send the Measurement Command
Front Panel:
SCPI Command:
MEAS:CURR:ACDC?(@1)
Time interval values from 10.24 up to 20.48 microseconds are rounded
to the nearest 10.24-microsecond increment. Values above 20.48
microseconds are rounded to the nearest 20.48-microsecond increment
when the resolution is set to RES20. Values above 20.48 microseconds
are rounded to the nearest 40.96-microsecond increment when the
resolution is set to RES40.
You can change the time interval resolution as follows:
Not Available
To set the resolution to 20 microseconds:
SENS:SWE:TINT:RES RES20, (@1)
To set the resolution to 40 microseconds:
Windowing is a signal conditioning process that reduces the error in
average measurements made in the presence of periodic signals and
noise. Two window functions are available: Rectangular and Hanning. At
power-on, the measurement window is Rectangular.
The Rectangular window calculates average measurements without any
signal conditioning. However, in the presence of periodic signals such
AC line ripple, a Rectangular window can introduce errors when
calculating average measurements. This can occur when a non-integral
number of cycles of data has been acquired due to the last partial cycle
of acquired data.
One way of dealing with AC line ripple is to use a Hanning window. The
Hanning window applies a cos
calculating average measurements. This attenuates the AC noise in the
measurement window. The best attenuation is achieved when at least
three or more waveform cycles are in the measurement.
4
weighting function to the data when
Select
.
Then select either Rectangular
To set the sense window to
Hanning for output 1 use:
or Hanning and press Select.
The following commands trigger and return measurement data.:
Select the Meter key. Front
panel meters can only measure
average voltage and current.
To measure average voltage &
current:
MEAS:VOLT?(@1)
MEAS:CURR?(@1)
To measure RMS voltage & current:
MEAS:VOLT:ACDC?(@1)
4 Operating the Power System
82 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
MEAS:POW?(@1)
Front Panel:
SCPI Command:
MEAS:ARR:VOLT?(@1)
MEAS:ARR:CURR?(@1)
Retrieve array data
Front Panel:
SCPI Command:
FETC:ARR:VOLT?(@1)
FETC:ARR:CURR?(@1)
Not Available
Power can only be measured on power modules with simultaneous
measurement capability (see chapter 1, “Model Differences”)
Array queries return all values in the voltage and current measurement
buffer. No averaging is applied, only raw data is returned from the buffer.
Not Available
To measure the high level of a
pulse:
MEAS:VOLT:HIGH?(@1)
MEAS:CURR:HIGH?(@1)
To measure the low level of a pulse:
MEAS:VOLT:LOW?(@1)
MEAS:CURR:LOW?(@1)
To measure the maximum value:
MEAS:VOLT:MAX?(@1
MEAS:CURR:MAX?(@1)
To measure the minimum value:
MEAS:VOLT:MIN?(@1)
MEAS:CURR:MIN?(@1)
To measure power:
MEAS:ARR:POW?(@1)
Once a measurement finishes, you may wish to retrieve the array data
without initiating a new measurement. Use FETCh queries to return the
array data from the last measurement. Fetch queries do not alter the
data in the measurement buffer. The commands are:
Not Available
FETC:ARR:POW?(@1)
Power can only be measured on power modules with simultaneous
measurement capability (see chapter 1, “Model Differences”)
If a FETCh query is sent before the measurement is started or before it is
finished, the response will be delayed until the measurement trigger
occurs and the acquisition completes. This may tie up the computer if
the measurement trigger does not occur immediately. You can test the
MEAS_active bit in the operation status register to know when the
measurement has completed as explained in the following section.
Operating the Power System 4
Keysight N6700 User’s Guide 83
Synchronizing Digitizer Measurements
Select the Measurement Function to Trigger
Front Panel:
SCPI Command:
SENS:FUNC:CURR ON,(@1)
Capture Pre-trigger Data
TRIGGER
524,288 DATA POINTS
524,288 DATA POINTS
524,288 DATA POINTS
OFFSET = -524,287
OFFSET = -262,144
OFFSET = 0
524,288 DATA POINTS
OFFSET = 0 to 2E9
TIME
Use the measurement trigger system to synchronize the acquisition of
measurements with a Bus, Transient, or an external trigger. Then use
FETCh commands to return voltage or current information from the
acquired data. Briefly, to make a triggered measurement:
Select the measurement function to trigger.
Adjust the measurement to capture pre-trigger data.
Select the trigger source.
Initiate the trigger system and generate a trigger.
Fetch the triggered measurements.
The following commands select a measurement function.
Not Available
To select the voltage measurement function:
SENS:FUNC:VOLT ON,(@1)
To select the current measurement function:
Some power modules have two measurement converters, which allow
simultaneous voltage and current measurements (Refer to Chapter 1,
“Model Differences”). In that case, BOTH voltage and current
measurements can be enabled. If a power module has only one
converter, the parameter that it measures (either voltage or current)
must be specified.
The measurement system lets you capture data before, after, or at the
trigger signal. As shown in the following figure, you can move the block
of data being read into the acquisition buffer with reference to the
trigger. This allows pre- or post-trigger data sampling.
4 Operating the Power System
84 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
Measure\Sweep
NOTE
Select the Measurement Trigger Source
NOTE
Bus
Selects GPIB device trigger, *TRG, or <GET> (Group Execute Trigger).
External
Pin<n>
Trigger Input in order to be used as a trigger source (see Appendix B).
Transient<n>
earlier in this chapter.
Front Panel:
SCPI Command:
To offset the beginning of the acquisition buffer relative to the
acquisition trigger, use:
Select
Enter an offset value and press
Select.
When the value is 0, all values are taken after the trigger. Values greater
than 0 can be used to program a delay time from the receipt of the
trigger until the values entered into the buffer are valid. (Delay time =
offset x sample period). Negative values let you acquire samples prior to
the trigger.
If, during a pre-trigger data acquisition, a trigger occurs before the pretrigger data count is completed, the measurement system ignores this
trigger. This will prevent the completion of the measurement if another
trigger is not generated.
.
To offset the measurement on
channel 1 by 100 points use:
SENS:SWE:OFFS:POIN 100,(@1)
An immediate trigger command over the bus will generate an immediate
trigger regardless of the trigger source.
Unless you are using a TRIGger:ACQuire command to trigger the
measurement, select a trigger source from the following:
Selects any pin configured as a trigger input as the trigger source.
Selects a pin on the external port connector as the trigger source.
<n> specifies the pin number. The selected pin must be configured as a
Selects the output channel’s transient system as the trigger source.
<n> specifies the channel.
set up that channel’s transient system to generate a trigger out signal.
See “Generate Trigger Out Signals” and “Program an Arbitrary List”
Use the following commands to select a trigger source:
Not Available
When you select a channel, you must also
To select Bus triggers for output 1:
TRIG:ACQ:SOUR BUS,(@1)
To select a Digital pin as the trigger:
TRIG:ACQ:SOUR PIN<n>,(@1)
To select a Transient output as trigger:
TRIG:ACQ:SOUR TRAN<n>,(@1)
where n is the output channel that will
generate the trigger signal.
Operating the Power System 4
Keysight N6700 User’s Guide 85
Initiate the Measurement Trigger System
Front Panel:
SCPI Command:
INIT:ACQ (@1)
Front Panel:
SCPI Command:
NOTE
system each time
Trigger the Measurement
Front Panel:
SCPI Command:
Next, you must initiate or enable the measurement trigger system.
When the power system is turned on, the trigger system is in the idle
state. In this state, the trigger system is disabled, ignoring all triggers.
The INITiate commands enable the trigger system to receive triggers. To
initiate the trigger system, use:
Not Available
It takes a few milliseconds for the instrument to be ready to receive a
trigger signal after receiving the INITiate:ACQuire command, and it can
take longer for Keysight Models N678xA SMU.
If a trigger occurs before the trigger system is ready for it, the trigger will
be ignored. You can test the WTG_meas bit in the operation status
register to know when the instrument is ready to receive a trigger after
being initiated.
Not Available
If a bit value of 8 is returned in the query, the WTG_meas bit is true, and
the instrument is ready to receive the trigger signal. Refer to the N6700
Programmer’s Reference Help file for more information.
It will be necessary to initiate the measurement trigger
a triggered measurement is desired.
To initiate the measurement trigger
system:
To query the WTG_meas bit (bit 3):
STAT:OPER:COND?(@1)
The trigger system is waiting for a trigger signal in the initiated state.
You can immediately trigger the measurement as follows:
Not Available
As previously discussed, a trigger can also be generated by another
output channel or an input pin on the digital port connector. If any of
these systems are configured as the trigger source, the instrument will
wait indefinitely for the trigger signal. If the trigger does not occur, you
must manually return the trigger system to the idle state.
To generate a measurement trigger:
TRIG:ACQ (@1)
Alternatively, if the trigger source is BUS,
you can also program a *TRG or an
IEEE-488 <get> command.
4 Operating the Power System
86 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
Measure\Control
ABOR:ACQ (@1)
Fetch the Measurement
Front Panel:
SCPI Command:
FETC:POW?(@1)
Front Panel:
SCPI Command:
STAT:OPER:COND?(@1)
The following commands return the trigger system to the idle state:
Select
Then select the Abort control.
.
After a trigger is received and the data acquisition completes, the trigger
system will return to the idle state. When this occurs, you can use FETCh
queries to return the measurement data.
Not Available
To return average voltage & current:
FETC:VOLT?(@1)
FETC:CURR?(@1)
To return RMS voltage & current:
FETC:VOLT:ACDC?(@1)
FETC:CURR:ACDC?(@1)
To return the high level of a pulse:
FETC:VOLT:HIGH?(@1)
FETC:CURR:HIGH?(@1)
To return the low level of a pulse:
FETC:VOLT:LOW?(@1)
FETC:CURR:LOW?(@1)
To return the maximum value:
FETC:VOLT:MAX?(@1
FETC:CURR:MAX?(@1)
To return the minimum value:
FETC:VOLT:MIN?(@1)
FETC:CURR:MIN?(@1)
To return power:
Power can only be measured on power modules with simultaneous
measurement capability (see chapter 1, “Model Differences”)
If a FETCh query is sent before the measurement is finished, the
response will be delayed until the measurement trigger occurs and the
acquisition completes. You can test the MEAS_active bit in the operation
status register to know when the measurement trigger system has
returned to the idle state.
Not Available
If a bit value of 32 is returned in the query, the MEAS_active bit is true,
and the measurement is NOT complete. When the MEAS_active bit is
false, you can retrieve the measurement. Refer to the N6700
Programmer’s Reference Help file for more information.
To query the MEAS_active bit (bit 5):
Operating the Power System 4
Keysight N6700 User’s Guide 87
Using the Protection Functions
OV
OVP is always enabled.
OV−
N6783A.
OC
limit setting.
OT
OSC
Only applies to Keysight N678xA SMU.
PF
CP+
function does not apply to all power modules. Refer to Appendix C for further information.
CP−
information.
PROT
from another output, or because the programmed output watchdog time has expired.
INH
an external shutdown signal. Refer to Appendix B for further information.
Set the Over-Voltage Protection
Option J01
Each output has independent protection functions. A front panel status
indicator will turn on when a protection function has been set. Protection
functions are latching, which means that they must be cleared once they
have been set. As explained under “Couple Output Protection” you can
configure the instrument so that when a protection fault occurs on one
output, ALL outputs will be turned off.
Of the following protection functions, only OV, OV-, OC, OSC, PROT, and
INH are user- programmable.
Over-voltage protection is a hardware OVP whose trip level is a programmable value. The
Negative voltage protection is a hardware OVP. Only applies to Keysight N678xA SMU and
Over-current protection is a programmable function that can be enabled or disabled.
When enabled, the output will be disabled when the output current teaches the current
Over-temperature protection monitors the temperature of each output and shuts down the
output if any temperature exceeds the maximum factory-defined limits.
Oscillation protection shuts down the output if an oscillation is detected on the output.
PF indicates that a power fail condition on the AC mains has disabled the output.
CP+ indicates that a positive power limit condition has disabled the output. This protection
CP− indicates that a negative power limit condition has disabled the output. This
protection function does not apply to all power modules. Refer to Appendix C for further
Prot indicates that the output is disabled, either because of a coupled protection signal
The Inhibit input (pin 3) on the rear panel digital connector can be programmed to act as
The over-voltage protection function turns off the affected output if the
output voltage reaches the programmed over-voltage limit. The OVP
circuit monitors the voltage at the + and – output terminals. However, on
Keysight Models N678xA SMU and units with Option J01, the voltage is
monitored at the + and – sense terminals. This allows for more precise
over-voltage monitoring directly at the load.
Units with
overvoltage protection. It lets you set an overvoltage protection limit that
is offset from the programmed voltage. The tracking OVP threshold
automatically tracks the real time programmed settings. Option J01 is
only available on models N6752A, N6754A and N6762A.
have tracking OVP in addition to the standard
4 Operating the Power System
88 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
Protect\OVP
VOLT:PROT:TRAC:OFFS 2,(@1)
Set the Over-Current Protection
Front Panel:
SCPI Command:
Protect\OCP
Check Enable OCP and press Select.
CURR:PROT:STAT 1,(@1,2)
Front Panel:
SCPI Command:
Protect\OCP
To start the delay timer by a settings
CURR:PROT:DEL:STAR SCH, (@1)
Select
.
Enter a value in the OVP level
box and press Select.
For J01 units, enter a value in
the Tracking OVP Offset box
and check the Enable box.
Then press Select.
Keysight Models N678xA SMU also have a back-up local OVP function. Refer
to “Over-voltage Protection” in chapter 2 for a description of the feature.
Additionally, for Keysight Model N6784A, you can program a negative overvoltage value. Enter the value in the -OVP
When over-current protection is enabled, the power system turns off the
output if the output current reaches the current limit setting and
transitions from CV to CC mode.
Select
.
To set an OVP of 10 V for output 1:
VOLT:PROT 10,(@1,2)
For Models N678xA SMU:
VOLT:PROT:REM 10,(@1,2)
To enable tracking OVP for output 1:
VOLT:PROT:TRAC ON,(@1)
To set the tracking offset for output 1:
field.
To enable OCP for outputs 1 and 2:
You can also specify an OCP delay to prevent momentary CV-to-CC
status changes from tripping the over-current protection. The power
system may momentarily transition into CC mode when it is turned on,
when an output value is programmed, or when the output load is
connected. In most cases these temporary conditions would not be
considered an over-current protection fault, and having an OCP
condition disable the output when the CC status bit is set would be a
nuisance. Specifying an OCP delay lets the OCP circuit ignore the CC
status bit during the specified delay period. Once the OCP delay time
has expired and if the CC mode persists, the output will shut down.
The delay can be programmed from 0 to 0.255 seconds. You can specify
if the OCP delay timer is started by any transition of the output into CC
mode, or only at the end of a settings change in voltage, current, or
output state.
Select
Enter a delay value and press Select.
Check "Start delay on CC" to start
the delay timer by ANY output
transition into CC mode. Otherwise,
.
To specify a 10 millisecond delay:
OUTP:PROT:DEL 0.01,(@1)
To start the delay timer by ANY
output transition into CC mode:
CURR:PROT:DEL:STAR CCTR, (@1)
the delay timer will only be started
by a settings change in voltage,
change in voltage current or output:
current, or output state.
Operating the Power System 4
Keysight N6700 User’s Guide 89
Couple Output Protection
Front Panel:
SCPI Command:
Protect\Couple
OUTP:PROT:COUP ON
Output Watchdog Timer
Factors that influence how long the settings change or output load
change may last include: difference between old output value and new
output value, the current limit setting, and the load capacitance in CV
mode or load inductance in CC mode. The delay required must be
determined empirically; the power module programming-response time
characteristics may be used as guidelines.
Note that the time it takes the output to go into CC mode varies depending on the magnitude of the over-current condition compared to
the current limit setting. For example, if the over-current is only slightly
greater than the current limit setting, it may take several tens of
milliseconds, depending on the power module type, for the output to set
the CC status bit. If the over-current is significantly greater than the
current limit setting, it may only take a few milliseconds or less,
depending on power module type, for the output to set the CC status bit.
To determine when the output will shut down, you must add the time it
takes for the CC status bit to the over-current protection delay time. If
the over-current persists beyond the sum of these two time intervals, the
output will shut down.
Protection coupling lets you disable all output channels when a
protection condition occurs on a single output channel. To couple output
protection:
Select
Check the Enable Coupling box
and press Select.
The output watchdog timer causes all outputs to go into protection
mode if there is no SCPI I/O activity on the remote interfaces (USB, LAN,
GPIB) within the user-specified time period. Note that the watchdog
timer function is NOT reset by activity on the front panel or when using
the Web server – the outputs will still shut down after the time period
has elapsed..
After the time period has expired, the outputs will be disabled, but the
programmed output state is not changed. The PROT bit in the status
questionable register as well as the PROT indicator on the front panel
will be set.
.
To enable output protection
coupling:
The watchdog delay can be programmed from 1 to 3600 seconds in 1
second increments. As shipped from the factory, the watchdog timer is
set to disable the outputs 60 seconds after all IO activity has ceased.
The watchdog state and delay settings are volatile, but can be saved and
recalled as part of the instrument state. A watchdog protect can be
cleared as described under “Clear Output Protection Functions”.
4 Operating the Power System
90 Keysight N6700 User’s Guide
Front Panel:
SCPI Command:
Protect\Wdog
OUTP:PROT:WDOG:DEL 600
Set the Oscillation Protection
NOTE
Front Panel:
SCPI Command:
Protect\OSC
VOLT:PROT:OSC ON,(@1,2)
Clear Output Protection Functions
Front Panel:
SCPI Command:
Protect\Clear
OUTP:PROT:CLE(@1)
Select
Check Enable Watchdog to
enable the watchdog timer.
Enter a value in the Watchdog
Delay box and press Select.
This information applies to Keysight Models N678xA SMU only.
If open sense leads or capacitive loads outside the allowable range
cause the output to oscillate, the oscillation protection function detects
the oscillation and latches the output off. The condition is annunciated
on the front panel by the OSC status annunciator.
Select
Check the OSC box and
press Select.
.
To enable the output watchdog
timer:
OUTP:PROT:WDOG ON
To set the output watchdog timer to
600 seconds:
To enable oscillation protection for
output 1:
If an over-voltage, over-current, over-temperature, power-fail condition,
power-limit condition, protection condition, or inhibit signal occurs, the
power system turns off the affected output channel. The appropriate
operating status indicator on the front panel will be on. To clear the
protection function and restore normal operation, first remove that
condition that caused the protection fault. Then, clear the protection
function as follows:
Select
Select the Clear button.
.
To clear a protection fault on output 1:
Operating the Power System 4
Keysight N6700 User’s Guide 91
External Data Logging
NOTE
Function
External Data Logger
spreadsheet.
overflowing. The computer needs to provide the data storage function.
for other SCPI functions.
Logging rate
Up to 102.4 microseconds for one parameter with data format set to real.
Select the Measurement Functions and Ranges
Front Panel:
SCPI Command:
SENS:ELOG:FUNC:CURR:MINM ON,(@1)
Data viewing No front panel view or front panel control. Data must be exported to a
Data storage Buffers measurements for about 20 seconds and requires that the computer
The external data log function is only available on mainframes with firmware
revision D.01.09 and up. It cannot be programmed from the front panel.
The power system has an external data logger (ELOG) function that lets
you log voltage and current measurements from all four outputs directly
to an internal FIFO (first-in, first-out) buffer. Note that this buffer is only
large enough to hold about 20 seconds of accumulated measurements.
The following table lists this, along with some other restrictions that
apply to the external data logger.
periodically reads measurements to prevent the internal buffer from
Measurement
resources
Measurement
functions
Run independently on each output. Some outputs can be running an external
data log, while the remaining outputs can be used in front panel control or used
If a power module has only one measurement converter, then either voltage or
current, but not both, can be logged.
Briefly, to make external data log measurements:
Select the measurement functions and ranges.
Specify the measurement integration period.
Select the trigger source.
Trigger the data logger.
Retrieve the data log measurement.
The external data logger function cannot be programmed from the front
panel.
The following commands select a measurement function:
If a power module has simultaneous measurements (see chapter 1,
“Model Differences”), you can enable BOTH voltage and current
measurements on the same output channel. Power modules that do not
have simultaneous measurement capability cannot externally log both
voltage and current.
Some power modules also have multiple measurement ranges. Selecting
a lower measurement range provides greater measurement accuracy,
provided that the measurement does not exceed the range. To select
lower measurement ranges, use:
Not Available.
Seamless voltage and current measurement autoranging is available on
Keysight Models N6781A, N6782A, N6785A, and N6786A. This enables a
wide dynamic measurement range with no data lost across ranges.
Autoranging does not include the 10 μA range, which must be selected
manually.
Not Available
The integration period can be set from a minimum of 102.4
microseconds to a maximum of 60 seconds.
To set the 5 V measurement range:
SENS:ELOG:VOLT:RANG 5,(@1)
To set the 1 A measurement range:
To enable seamless elog autoranging:
SENS:ELOG:VOLT:RANG:AUTO ON,(@1)
Not Available
During the integration period, data log samples are averaged, and the
minimum and maximum values are tracked. At the end of each
integration period the average, minimum, and maximum values are
added to the internal FIFO buffer.
Although the absolute minimum integration period is 102.4
microseconds, the actual minimum varies as a function of the number of
parameters that are being logged. The actual minimum is 102.4
microseconds times the number of parameters being logged at each
interval. Note that you can measure up to 4 parameters with the time
interval resolution set to 20 microseconds, and up t o 8 parameters with
the resolution set to 40 microseconds.
To set an integration period of 600 microseconds:
Operating the Power System 4
Keysight N6700 User’s Guide 93
102.4 microseconds:
204.8 microseconds:
409.6 microseconds:
409.6 microseconds:
Front Panel:
SCPI Command:
SENS:SWE:TINT:RES RES40,(@1)
Front Panel:
SCPI Command:
FORM[:DATA] REAL
Select the Data Logger Trigger Source
BUS
Selects GPIB device trigger, *TRG, or <GET> (Group Execute Trigger).
EXTernal
Selects any pin configured as a trigger input as the trigger source.
IMMediate
immediately when initiated.
PIN<n>
(see Appendix C).
Front Panel:
SCPI Command:
TRIG:ELOG:SOUR BUS,(@1)
TRIG:ELOG:SOUR PIN<n>,(@1)
1 parameter (voltage or current)
2 parameters (voltage+current)
4 parameters (voltage+min+max+current)
with 20 µs time interval resolution)
Up to 8 parameters with 40 µs time interval
resolution
You can change the time interval resolution as follows:
Not Available
To set the resolution to 20 microseconds:
SENS:SWE:TINT:RES RES20,(@1)
To set the resolution to 40 microseconds:
If the specified integration period is at or near the minimum logging
intervals, the data format must be specified as binary. If binary format is
not specified, the data will be in ASCII format and the minimum logging
intervals will typically be up to five times longer than what can be
achieved with binary format.
Not Available
To set the data format to binary:
The TRIGger:ELOG command generates an immediate trigger regardless
of the trigger source. Unless you are using this command, select a
trigger source from the following:
Selects the immediate trigger source. This triggers the data logger
Selects a pin on the digital port. <n> specifies the pin number. The pin
must be configured as a Trigger Input to be used as a trigger source
Use the following commands to select one of the available trigger
sources:
Not Available
or
TRIG:ELOG:SOUR IMM,(@1)
or
TRIG:ELOG:SOUR EXT,(@1)
or
4 Operating the Power System
94 Keysight N6700 User’s Guide
Initiate and Trigger the Data Logger
Front Panel:
SCPI Command:
TRIG:ELOG (@1)
Periodically Retrieve the Data log Measurement
Front Panel:
SCPI Command:
FETC:ELOG? 1000, (@1)
Terminate the Measurement
Front Panel:
SCPI Command:
ABOR:ELOG (@1)
When the power system is turned on, the trigger system is in the Idle
state. In this state, the trigger system is disabled, ignoring all triggers.
The INITiate command enables the measurement system to receive
triggers. To initiate and trigger the external data log:
Not Available
If the trigger source is BUS, you can also program *TRG or <GET> to
trigger the data logger.
When triggered, the data logger starts placing data in the internal
measurement buffer. Because the buffer is only large enough to hold 20
seconds of accumulated measurement your PC application must
periodically retrieve (or fetch) the data from this buffer.
To initiate data log measurements:
INIT:ELOG (@1)
To trigger the data logger:
Each FETCh command returns number of requested records of the data
in the buffer and removes them, making room available for more data.
The measurement continues until it is aborted.
Not Available
ASCII data (the default format) is returned as comma-separated ASCII
numeric data sets of average/min/max values terminated by a newline.
ASCII queries can only fetch data from one channel at a time.
To retrieve a maximum of 1000 records:
Binary data is returned as a comma-separated list of data for each
channel requested. The data for each channel is a definite length binary
block, with the byte order specified by the FORMat:BORDer command.
Not Available
To abort the external data logger:
Operating the Power System 4
Keysight N6700 User’s Guide 95
System-Related Operations
Self-Test
Err
Front Panel:
SCPI Command:
*TST?
Instrument Identification
Front Panel:
SCPI Command:
System\About\Frame
System\About\Module
*IDN?
SYST:CHAN:SER? (@1)
Instrument State Storage
Front Panel:
SCPI Command:
States\SaveRecall
Front Panel:
SCPI Command:
States\PowerOn
OUTP:PON:STAT RCL0
A power-on self-test occurs automatically when you turn on the power
system. This test assures you that the instrument is operational. If the
self-test is successful, the power system will continue to operate
normally. If the self-test fails, the front panel
Press the Error key to display the list of errors on the front panel. Refer
to the Service Guide for further information.
indicator comes on.
Cycle AC power.
For Keysight N6700 mainframes, you can return the model number,
serial number, firmware revision, backup and active firmware. For power
modules, you can return the
options, voltage, current and power rating.
Select
or
Select
The power system has two storage locations in non-volatile memory to
store instrument states. The locations are numbered 0 and 1. Any state
previously stored in the same location will be overwritten.
Select
In the SaveRecall field, enter a
location from 0 to 1, and press
Select. Select Save to save the
state or Recall to recall a state.
model number, serial number, installed
.
SYST:CHAN:MOD? (@1)
SYST:CHAN:OPT? (@1)
.
.
To save a state:
*SAV <n>
To recall a state:
*RCL <n>
When shipped from the factory, the power system is configured to
automatically recall the reset (*RST) settings at power-on. However, you
can configure the power system to use the settings stored in memory
location 0 at power-on.
Select
Select Recall State 0, then press
Select.
.
4 Operating the Power System
96 Keysight N6700 User’s Guide
Output Groups
NOTE
lowest
Front Panel:
SCPI Command:
System\Groups
Front Panel:
SCPI Command:
System\Groups
Front Panel:
SCPI Command:
SYST:REB
Output grouping does not apply to Keysight Models N678xA SMU.
Output channels can be configured or “grouped” to create a single
output with higher current and power capability. Almost all instrument
functionality is supported by grouped channels, including voltage and
current programming, measurements, status, step and list transients.
The following conditions apply:
Up to four output channels can be grouped per mainframe.
Output channels that are grouped must also be connected in
parallel as described in Chapter 2.
Grouped channels do not have to be adjacent, but they must have
identical model numbers and options installed.
The maximum output current is the sum of the maximum of each
channel in the group.
Low current measurement ranges should not be used with grouped
channels, otherwise a measurement overload error will occur. Low
current output ranges, however, can be used.
Over-current protection delay has a slightly slower response time
(~10 ms) and slightly less resolution than an ungrouped channel.
When output channels have been grouped, they are addressed
using the channel number of the
Power limiting should not be used when Keysight N673xB, N674xB,
and N677xA
power modules are grouped. Refer to Appendix C.
channel in the group.
Select
.
In the matrix that appears,
select the channels you want
to group. Each row defines a
To configure a group of channels:
SYST:GRO:DEF (@2,3,4)
This groups channels 2 through 4. To
address the group, use channel 2.
separate group.
To return grouped channels back to an ungrouped state, first remove the
parallel connections between channels and proceed as follows:
Select
.
In the matrix, place each
To ungroup all channels:
SYST:GRO:DEL:ALL
output channel in its own
separate group.
Reboot the unit for the changes to take effect.
Cycle AC power.
Operating the Power System 4
Keysight N6700 User’s Guide 97
Front Panel Keys
Lockout
Front Panel:
SCPI Command:
System\Preferences\Lock
NOTE
Keys
Front Panel:
SCPI Command:
System\Preferences\Keys
Front Panel:
SCPI Command:
System\Preferences\Keys
You can lock the front panel keys to prevent unwanted control of the
instrument from the front panel. This is the most secure way of locking
the front panel keys because you need a password to unlock the front
panel. The lockout setting is saved in non-volatile memory so that the
front panel remains locked even after AC power is cycled.
Select
In the dialog box, enter the password
to unlock the front panel. Then select
Lock.
The menu to unlock the front panel
appears every time a key is pressed.
Enter the password to unlock the front
panel.
If the password is lost, the SYSTem:PASSword:FPANel:RESet command
can reset the front panel lockout password. Refer to the Programmer’s
Reference Help file on your Keysight N6700 Product Reference CD for
more information.
The SYSTem:COMMunicate:RLSTate RWLock command can also lock
and unlock the front panel. This command is completely independent of
the front panel lockout function. If you use this command to lock the
front panel, the front panel will be unlocked when AC power is cycled.
Not Available
You can enable or disable the front panel key clicks.
Select
Check Enable key clicks to enable key
clicks. Uncheck to disable key clicks.
You can configure the On/Off key to enable or disable ALL outputs.
Select
Check On/Off key affects all channels.
The ON/Off key will now be active on
ALL channels.
.
Not Available
Not Available
4 Operating the Power System
98 Keysight N6700 User’s Guide
Front Panel Display
Screen Saver
Front Panel:
SCPI Command:
System\Preferences\Display\Saver
Contrast
Front Panel:
SCPI Command:
System\Preferences\Display\Contrast
View
Front Panel:
SCPI Command:
System\Preferences\Display\View
The power system has a front panel screen saver that significantly
increases the life of the LCD display by turning it off during periods of
inactivity. The delay can be set from 30 to 999 minutes in 1 minute
increments. As shipped from the factory, the screen saver comes on one
hour after activity on the front panel or interface has ceased.
When the screen saver is active, the front panel display turns off, and the
LED next to the Line switch changes from green to amber. To restore the
front panel display, simply press one of the front panel keys. The first
action of the key turns the display on. Subsequently, the key will revert
to its normal function.
If the Wake on I/O function is selected, the display is restored whenever
there is activity on the remote interface. This also resets the timer on the
screen saver. As shipped, Wake on I/O is active.
Select
Enable or disable the screen saver by
checking or unchecking the Screen Saver
checkbox. Then Press Select.
Enter a value in minutes in the Saver Delay
field to specify the time when the screen
saver will activate.
Check Wake on I/O to activate the display
with I/O bus activity.
Not Available.
You can set the contrast of the front panel display to compensate for
ambient lighting conditions. The contrast can be set from 0% to 100% in
increments of 1%. As-shipped, the contrast is set to 50%.
Select
Enter a contrast value in the Contrast box.
Then Press Select.
Not Available.
You can specify how the output channels are displayed at turn on.
This appendix lists the supplemental characteristics of the Keysight
N6700 Modular Power System. A dimensional line drawing of the
mainframe is included at the end of the chapter.
Supplemental characteristics are not warranted but are descriptions of
performance determined either by design or type testing. All
supplemental characteristics are typical unless otherwise noted.
Complete specifications and supplemental characteristics information
for all power modules are included in the Keysight N6700 Modular
Power System Family Specifications Guide. This document is available
on the Keysight N6700 Product Reference CD that is shipped along with
your instrument as well as on the web at www.keysight.com/find/N6700
Appendix A Specifications
100 Keysight N6700 User’s Guide
Keysight N6700B, N6701A, N6702A MPS Mainframes
Supplemental Characteristics
N6700B, N6701A, N6702A
Maximum Power Available for Modules:
Internal Flash Memory:
Protection Response Characteristics:
Command Processing Time:
Digital Control Characteristics:
Interface Capabilities:
Regulatory Compliance:
(sum of total module output power)
8 Mbyte
400 W (for N6700B mainframes)
600 W (for N6701A mainframes)
1200 W (for N6702A mainframes)
INH input
Fault on coupled outputs
≤ 1 ms from receipt of command to start of output change
Pins 1 - 7 as digital/trigger inputs
and pin 3 as INH input
(pin 8 = common)
GPIB
LXI Compliance
USB 2.0
10/100 LAN
Built-in Web server
5 µs from receipt of inhibit to start of shutdown
< 10 µs from receipt of fault to start of shutdown
+16.5 VDC/− 5 VDC between pins
(pin 8 is internally connected to chassis ground).
Maximum low-level output voltage = 0.5 V @ 4 mA
Maximum low-level sink current = 4 mA
Typical high-level leakage current = 1 mA @ 16.5 VDC
Maximum low-level output voltage = 0.5 V @ 4 mA;1 V @ 50 mA; 1.75 V @ 100 mA
Maximum low-level sink current = 100 mA
Typical high-level leakage current = 0.8 mA @ 16.5 VDC
Maximum low-level input voltage = 0.8 V
Minimum high-level input voltage = 2 V
Typical low-level current = 2 mA @ 0 V (internal 2.2k pull-up)
Typical high-level leakage current = 0.12 mA @ 16.5 VDC
SCPI - 1993, IEEE 488.2 compliant interface
Class C (only applies to units with LXI label on front panel)
Requires Keysight IO Library version M.01.01 or 14.0 and up
Requires Keysight IO Library version L.01.01 or 14.0 and up
Requires Internet Explorer 7+ or Firefox 2+
EMC
Safety
Complies with European EMC Directive for test and measurement
products.
● IEC/EN 61326-1
● CISPR 11, Group 1, class A
● AS/NZS CISPR 11
● ICES/NMB-001
Complies with Australian standard and carries C-Tick mark.
This ISM device complies with Canadian ICES-001.
Cet appareil ISM est conforme à la norme NMB-001 du Canada.
Complies with European Low Voltage Directive and carries the CEmarking.
Conforms to UL 61010-1 and CSA C22.2 61010-1.
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