Stanford Research Systems PS350, PS325, PS310 User Manual
SERIES PS300
HIGH VOLTAGE
POWER SUPPLIES
MODEL PS310
MODEL PS325
MODEL PS350
1290-D Reamwood Ave.
Sunnyvale, CA 94089 U.S.A.
Phone: (408) 744-9040, Fax: (408) 744-9049
Copyright © 1998, 2000
Stanford Research Systems, Inc.
Al Rights Reserved
Revision 2.9
08/2004
TABLE OF CONTENTS
Safety and Preparation for Use
Series PS300 Specifications
Instrument Overview
Front Panel Summary 7
Power Button 7
High Voltage Enable Switch 7
LED Displays 7
Select, Enter, and Clear 7
Numeric and Cursor Keys 8
Instrument Status 8
Other Keys 8
Store and Recall 8
Rear Panel Summary 9
Power Entry Module 9
High Voltage Output Connector 9
High Voltage Polarity Selector 9
Analog Outputs 9
IEEE-488 Port 10
Guide to Operation
Setting Output Voltage 11
Setting Voltage Limit 11
Setting Current Limit 11
Setting Current Trip 11
Primary Trip 11
Reset Mode 11
Store and Recall 12
Error Messages 12
Analog Programming and Monitor 12
Default Setup 12
Guide to Programming
Remote Programming 13
Command Syntax 13
Detailed Command List 13
Output Control Commands 13
Setting Control Command 14
Interface Control Commands 14
Status Reporting Commands 15
Status Reporting 15
Serial Poll Status Byte 15
Standard Event Status Byte 16
GPIB Error Messages 16
Program Examples 17
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Example 1 - IBM PC, Microsoft Basic,
Via Capitol Equipment Corp GPIB 17
Example 2 - IBM PC, Microsoft C 4.0,
Via Capitol Equipment Corp GPIB 19
Example 3 - IBM PC, Microsoft C 4.0,
Via National Instruments GPIB 21
Troubleshooting
Power On Reset 23
Stuck Keys 23
No High Voltage 23
Repeated Trips 23
Rear Panel Voltage Set 23
Front Panel Test 23
Calibration 24
Circuit Description
Introduction 25
Voltage Control 25
Low Voltage Pre-Regulator and
High Frequency Inverter 25
Limits and Trips 26
A/D's and D/A's 26
Microprocessor Control 26
GPIB and Front Panel Interface 26
Low Voltage Power Supplies 27
Front Panel 27
High Voltage Section 27
Component List
Main Board 29
Front Panel 35
HV Board - PS310, PS325, PS350 36
Miscellaneous Parts 40
Schematics
Voltage Control 1/11
High Voltage Drive 2/11
Limits and Trips 3/11
Analog Voltages and A/D 4/11
Microprocessor Section 5/11
GPIB and Front Panel 6/11
Low Voltage Power Supply 7/11
HV Front Panel 8/11
Model PS310 - 1250 V, 20 mA 9/11
Model PS325 - 2500 V, 10 mA 10/11
Model PS350 - 5000 V, 5 mA 11/11
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SAFETY AND PREPARATION FOR USE
**********WARNING **********
This unit contains hazardous high voltages.
Please make certain that the high voltage is
completely discharged before removing the high
voltage cable. High voltage cables can store
charge if they are disconnected from the supply
while the high voltage is on. The charge on
the cable can cause injury or damage even after
the cable is disconnected from the unit.
Do not change the high voltage polarity unless
the power is off.
***********CAUTION **********
This instrument may be damaged if operated
with the LINE VOLTAGESELECTOR set for
the wrong AC line voltage or if the wrong fuse is
installed.
Line Voltage Section
The PS300 series operates from 100, 120, 220 or
240 Volts nominal AC power source with a line
frequency of 50 or 60 Hz. Before connecting the
power cord to a power source, verify that the
LINE VOLTAGE SELECTOR card, located in
the rear panel fuse holder, is set so the correct
AC input voltage is visible.
Conversion to other AC input voltages requires a
change in the fuse holder voltage card position
and fuse value. Disconnect the power cord, open the
fuse holder cover door, and rotate the fuse-pull lever
to remove the fuse. Remove the small printed circuit
board. Select the operating voltage by orienting the
printed circuit board. Press the circuit board firmly
into its slot, so the desired voltage is visible. Rotate
the fuse-pull lever back into its normal position.
Insert the correct fuse into the fuse holder.
Line Fuse
Verify that the correct line fuse is installed before
connecting the line cord. For 100 V / 120 V, use a 1
Amp fuse and for 220 V / 240 V, use a 1/2 Amp fuse.
Line Cord
The PS300 series use a detachable, three-wire power
cord for connection to the power source and to a
protective ground. The exposed metal parts of the
instrument are connected to the outlet ground which
provides protection against electrical shock. Always
use an outlet which has a properly connected
protective ground.
Connection to Other Instruments
The back panel BNC shields are connected to the
chassis ground and the AC power source ground via
the power cord. Do not apply any voltage to the
shield. The high voltage SHV connector is also
connected to the chassis ground and CANNOT be
floated away from ground.
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SERIES PS300 SPECIFICATIONS
General Information
The PS300 series are programmable precision high voltage power supplies for use in laboratory or test
applications. They feature reversible polarity, excellent regulation and low output voltage ripple. The digital
displays provide accurate readings of voltage and current. Also, digital entry of the current and voltage
provides accurate resettability. Output voltage can be set from either the front panel, the remote analog voltage,
or over the optional GPIB interface. Voltage and current signals are also available for remote monitoring.
Electrical Specifications
Model Output Voltage Maximum Output Current
PS310 50 to ±1250 Volts 20 mA
PS325 50 to ±2500 Volts 10 mA
PS350 50 to ±5000 Volts 5 mA
Voltage Set Accuracy 0.01% + 0.05% of full scale
Voltage Display Accuracy V Set Accuracy ±1 Volt, typ ( ±2 Volt, max)
Voltage Resolution 1 Volt (set and display)
Voltage Resettability 1 Volt
Voltage Limit Range 0 to 100% of full scale
Voltage Regulation (*) Line: 0.001% for ±10% line voltage change
Load: 0.005% for 100% load change, typ
Output Ripple < 0.0015% of full scale, Vrms, typ
< 0.002% of full scale, Vrms, max
Current Limit and Trip Range 0 to 105% of full scale
Current Set accuracy 0.01% + 0.05% of full scale
Current Resolution PS310: 10 µA
PS325: 10 µA
PS350: 1 µA
Current Display Accuracy PS350: I Set Accuracy ±1 µA, typ ( ±2 µA, max)
PS325 or PS310: Accuracy ±10 µA, typ ( ±20 µA, max)
Stability 0.01% per hour, < 0.03% per 8 hours
Temperature Drift 50 ppm / °C, 0° to 50° C, typ
Protection Arc and short circuit protected; programmable voltage and
current limits and current trip.
(*) Regulation specifications apply for > 0.5% (full load) or 1.0% (no load) of full scale Voltage.
Below these values the unit may not regulate correctly.
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Recovery Time 12 ms for 40% step change in load current, typ
Discharge Time <6 sec (to < 1% of full scale voltage with no load, typ)
Trip Response Time <10 µs
Minimum Trip Current 10 µA
Monitor Outputs Output Scale: 0 to +10 Volts for 0 to full scale output
regardless of polarity
Current Rating: 10 mA, max
Output Impedance: < 1 Ω
Accuracy:0.2% of full scale
Update Rate: 8 Hz
External Voltage Set Input Scale: 0 to +10 Volts for 0 to full scale output
regardless of polarity
Input Impedance: 1 MΩ
Accuracy:0.2% of full scale
Update Rate: 16 Hz
Output Slew Rate: < 0.3 sec for 0 to full scale under full load
Mechanical Specifications
Dimensions 16.0" x 8.1" x 3.5" (L x W x H)
The PS300 series are 1/2 rack width (19 inch standard rack). Optional rack
mounting kits are available for single or double rack mounts. The single
rack mount provides mounting for one supply. The double rack mount
provides side by side mounting for 2 supplies.
Weight 8 lbs
Input power 50 watts, 100, 120, 220, 240 VAC ±10%, 50 or 60 Hz
Output High Voltage Connector SHV male (Kings Type 1704-1 or equivalent, not included)
Mating High Voltage Connector SHV female (Kings Type 1705-14 or equivalent, not included)
Warranty One year parts and labor on materials and workmanship
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INSTRUMENT OVERVIEW
Front Panel Su m mary
Power Button
The PS300 series are turned on by depressing the
POWER button. The unit always powers up with
the high voltage OFF. All instrument settings are
stored in nonvolatile memory and are saved when
power is turned off. The model number (310, 325,
or 350), firmware version, and serial number are
displayed when power is turned on. If an error
appears on power on, then the stored settings were
lost and the default settings are used. If the default
settings are desired, hold down the CLR (clear) key
while turning on the power.
High Voltage Enable Switch
This is a three position switch that performs several
functions. In the down position, the high voltage is
off and all trips are cleared. In this position the
high voltage is locked OFF and cannot be turned
on by computer control. The up position is
momentary and turns on the high voltage for
manual or rear panel analog control. In the middle
position the high voltage is enabled (but not
necessarily on) and can be turned on by computer.
The large red LED above the switch indicates that
the high voltage is on; the yellow LED below it
indicates a trip has occurred.
LED Displays
The two large displays show output voltage and
current to four significant places. Polarity is
displayed on the left of the voltage display. The
smaller center display shows the value of the
parameter that is being entered or adjusted. That
parameter is indicated by the row of LEDs directly
below the center display.
Select, Enter, and Clear
The SELECT key is used to choose which
parameter is being displayed in the center display.
The ENTER key enters the parameter shown in the
center display. The clear (CLR) key erases the
value in the middle display and recalls the last
value that was entered. To adjust a value, the
SELECT key is pressed until the appropriate LED
is lit. When the value is being changed, that LED
will flash to indicate that the value in the center
display is not the current unit setting. If an
incorrect value is entered, press CLR (clear) to start
over. When the desired value is in the center
display, pressing the ENTER key updates the unit's
actual setting and stops the LED's flashing.
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Numeric and Cursor Keys
Other Keys
All parameters may be adjusted using the cursor or
numeric keys. When using the cursors, the digit
being adjusted in the center display will flash. The
UP and DOWN keys increment and decrement the
digit. The LEFT and RIGHT keys select the
flashing digit. When using direct numerical entry,
simply press the number and decimal point keys
until the desired value appears on the center
display. Note that the current is specified in mA.
Instrument Status
Three LED's indicate the instrument's status. The
LIMIT LED is on when the unit is in current limit.
REM is on when the front panel is locked out.
SRQ is on when a GPIB service request is pending.
RESET sets the reset mode to either AUTO or
MAN (manual).
GPIB displays the GPIB address in the center
display so it can be adjusted. It is also the LOCAL
key when the unit is in the remote mode.
Store and Recall
STO (store) and RCL (recall) allow up to 9
complete instrument settings to be saved in
nonvolatile memory. RCL 0 recalls the default
settings.
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Rear Panel Summary
Power Entry Module
The power entry module is used to fuse the line,
select the line voltage, and block high frequency
noise from entering or exiting the unit. Refer to
the first page of the manual for instructions on
selecting the correct line voltage and fuse.
High Voltage Output Connector
WARNING: This unit contains hazardous
voltages. Please make certain that the high voltage
is completely discharged before removing or
connecting the high voltage cable. High voltage
cables can store charge if they are disconnected
from the supply while high voltage is present
which can cause injury or damage the unit.
The high voltage output connector is an SHV male
connector (Kings type 1704-1). Please make
certain that the high voltage is completely
discharged before changing the cable.
A 10 feet SHV-SHV or SHV-MHV cable is
available from SRS.
High Voltage Polarity Selector
WARNING: The unit must be turned off and the
high voltage should be completely discharged
before reversing the polarity. Failure to do this can
cause injury or damage the unit.
Polarity is indicated by the screwdriver slot on the
polarity switch as well as on the front panel's
voltage display. To reverse the polarity, turn the
unit off and allow the high voltage to completely
discharge. Then turn the polarity switch with a
large flathead screwdriver (clockwise for + to - and
counterclockwise for - to + ).
Analog Outputs
The two BNC's provide voltage and current
monitor signals, or an external voltage set and
current monitor. When the voltage select switch is
in the MON (monitor) position, both are 0 to +10
Volt outputs corresponding to 0 to full scale. When
the voltage select switch is in the SET position, the
current signal acts the same, but the voltage BNC
is an input, setting the the high voltage over the
same scale. When the switch is in the SET position,
the REAR LED on the front panel is lit, indicating
that the high voltage is under analog control and
cannot be adjusted from the keypad. All signals are
positive voltages, independent of output voltage
polarity.
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IEEE-488 Std Port (optional)
The 24 pin IEEE-488 (GPIB) connector allows
computer control of PS300 series supplies. The
address is set from the front panel using the GPIB
key.
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GUIDE TO OPERATION
Setting Output Voltage
The voltage set can be changed with the high
voltage on or off.
To set the high voltage output, press the SELECT
key until the VOLTAGE SET LED is lit. The
present value of the set voltage will be displayed in
the center window. To change the value, enter the
desired voltage by either the numeric or cursor
keys. After the new value has been entered into the
center display, press ENTER to update the output
voltage. The VOLTAGE SET LED will flash until
ENTER or CLR is pressed to remind you that the
displayed value is not the actual programmed
value. If an 'Err2' message appears (illegal
parameter entered), check the voltage limit to see
that it is greater than or equal to the desired set
voltage. Use the CLR key to clear any error
message.
If the REAR LED is lit, the high voltage is
programmed from the analog set input on the rear
panel. In this mode, when the center display is
showing VOLTAGE SET, the display is the
present programmed value of the high voltage and
cannot be adjusted from the front panel.
Setting Voltage Limit
The voltage limit is a protection feature to prevent
the output voltage from being set too high or
overshooting because of dramatic load changes.
The output voltage cannot be set higher than the
voltage limit. In addition, if the output ever
exceeds the limit by more than 10% of full scale,
the unit trips and the high voltage is disabled. If
this occurs, a 'VTRP'(voltage trip) message appears
in the middle display.
After a trip it is not necessary to clear the trip
before turning the high voltage back on. If it is
necessary to change a parameter before turning the
high voltage back on, pressing CLR or putting the
high voltage switch in the off position will clear the
trip.
To set the voltage limit, press the SELECT key
until the VOLTAGE LIMIT LED is lit. The present
value of the voltage limit is displayed in the center
window. Change it with either the numeric or
cursor keys and press ENTER to update the actual
limit value. If an 'Err2' message appears (illegal
parameter entered), check to see that the output
voltage is less than or equal to the voltage limit.
Setting Current Limit
Current limiting varies the output voltage to limit
the output current to less than or equal to the
programmed current limit value. When the unit is
current limited, the LIMIT LED is lit.
The current limit is set in the same fashion as the
voltage limit, by SELECTing the present value on
the center window, changing it and then
ENTERing the new value.
Setting Current Trip
The current trip shuts off the high voltage when the
output current exceeds the trip value. The current
trip value is set in the same fashion as the voltage
and current limits. After a current trip occurs, the
'ITRP' (current trip) message will appear in the
middle display. Current trips are cleared in the
same fashion as voltage trips.
Primary Trip
A PTRP (primary trip) message will occur if the
current through the primary side of the high
voltage transformer and the switching MOSFET's
exceeds about 5.3 Amps. This feature is included
to protect the transformer and FET's. The trip level
is not user programmable and may be cleared in the
same manner as the voltage and current trips. If
repeated PTRP's occur, see the troubleshooting
section.
Reset Mode
The reset mode determines how the unit responds
after a voltage or current trip.
MAN (manual) Mode: The high voltage remains
off after a trip and requires that the operator turn it
back on.
AUTO (automatic) Mode: The unit waits until
the output voltage has fallen to 1/50 of its full scale
value and then turns the high voltage back on. This
is useful when dealing with loads that occasionally
short circuit but recover after removing the high
voltage.
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