Agilent 6611C Users Guide

USER’S GUIDE

Dynamic Measurement DC Source

HP Model 66312A

System DC Power Supply

HP 6611C, 6612C, 6613C and 6614C

For instruments with Serial Numbers:

HP 66312A: US36310891 and up
HP 6611C: US37450101 and up
HP 6612C: US37460101 and up
HP 6613C: US37460101 and up
HP 6614C: US37460101 and up

HP Part No. 5962-8194

Microfiche No. 5962-8195

Printed in USA: July 1999

Warranty Information

CERTIFICATION

Hewlett-Packard Company certifies that this product met its published specifications at time of shipment
from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the
United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to
the calibration facilities of other International Standards Organization members.

WARRANTY

This Hewlett-Packard hardware product is warranted against defects in material and workmanship for a
period of three years from date of delivery. HP software and firmware products, which are designated by
HP for use with a hardware product and when properly installed on that hardware product, are warranted
not to fail to execute their programming instructions due to defects in material and workmanship for a
period of 90 days from date of delivery. During the warranty period Hewlett-Packard Company will, at its
option, either repair or replace products which prove to be defective. HP does not warrant that the
operation for the software firmware, or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service
facility designated by HP. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for
products returned to HP for warranty service. Except for products returned to Customer from another
country, HP shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in HP's product price, only if
Customer pays HP international prices (defined as destination local currency price, or U.S. or Geneva
Export price).

If HP is unable, within a reasonable time to repair or replace any product to condition as warranted, the
Customer shall be entitled to a refund of the purchase price upon return of the product to HP.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by
the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation
outside of the environmental specifications for the product, or improper site preparation and maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. HP
SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Warranty options, extended support
contacts, product maintenance agreements and customer assistance agreements are also available.
Contact your nearest Hewlett-Packard Sales and Service office for further information on HP's full line of
Support Programs.

2

Safety Summary

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 elsewhere in this manual violates safety

standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assumes no

liability for the customer's failure to comply with these requirements.

GENERAL

This product is a Safety Class 1 instrument (provided with a protective earth terminal). The protective features of
this product may be impaired if it is used in a manner not specified in the operation instructions.

Any LEDs used in this product are Class 1 LEDs as per IEC 825-1.

ENVIRONMENTAL CONDITIONS

This instrument is intended for indoor use in an installation category II, pollution degree 2 environment. It is
designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the
specifications tables for the ac mains voltage requirements and ambient operating temperature range.

BEFORE APPLYING POWER

Verify that the product is set to match the available line voltage, the correct fuse is installed, and all safety
precautions are taken. Note the instrument's external markings described under "Safety Symbols".

GROUND THE INSTRUMENT

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.

ATTENTION: Un circuit de terre continu est essentiel en vue du fonctionnement sécuritaire de l'appareil.
Ne jamais mettre l'appareil en marche lorsque le conducteur de mise … la terre est d‚branch‚.

FUSES

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be
used. Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

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

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must
be made only by qualified service personnel.

Instruments that appear damaged or defective should be made inoperative and secured against unintended
operation until they can be repaired by qualified service personnel.

3

SAFETY SYMBOLS

Direct current

Alternating current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

Terminal is at earth potential. Used for measurement and control circuits designed to be operated
with one terminal at earth potential.

Terminal for Neutral conductor on permanently installed equipment

WARNING

Caution

Terminal for Line conductor on permanently installed equipment

On (supply)

Off (supply)

Standby (supply). Units with this symbol are not completely disconnected from ac mains when
this switch is off. To completely disconnect the unit from ac mains, either disconnect the power
cord or have a qualified electrician install an external switch.

In position of a bi-stable push control

Out position of a bi-stable push control

Caution, risk of electric shock

Caution, hot surface

Caution (refer to accompanying documents)

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like,
which, if not correctly performed or adhered to, could result in personal injury. Do not proceed
beyond a WARNING sign until the indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like,
which, if not correctly performed or adhered to, could result in damage to or destruction of part
or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are
fully understood and met.

4

Declaration Page

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer's Name: Hewlett-Packard Company

Manufacturer's Address: 150 Green Pond Road

Rockaway, New Jersey 07866
U.S.A.

declares that the Product

Product Name: a) Dynamic Measurement DC Source

b) System DC Power Supply

Model Number: a) HP 66312A, 66312B

b) HP 6612B, 6611C, 6612C, 6613C, 6614C

conforms to the following Product Specifications:

Safety: IEC 1010-1:1990+A1(1992) / EN 61010-1:1993

EMC: CISPR 11:1990 / EN 55011:1991 - Group 1 Class B

IEC 801-2:1991 / EN 50082-1:1992 - 4 kV CD, 8 kV AD
IEC 801-3:1984 / EN 50082-1:1992 - 3 V / m
IEC 801-4:1988 / EN 50082-1:1992 - 0.5 kV Signal Lines
1 kV Power Lines

Supplementary Information:

The product herewith complies with the requirements of the Low Voltage Directive
73/23/EEC and the EMC Directive 89/336/EEC and carries the CE-marking accordingly.

New Jersey January 1997 ______
Location Date Bruce Krueger / Quality Manager

European Contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH,
Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:[phone])

5

Acoustic Noise Information

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der
Maschinenläminformationsverordnung vom 18 Januar 1991.

* Schalldruckpegel Lp <70 dB(A)
* Am Arbeitsplatz
* Normaler Betrieb
* Nach EN 27779 (Typprüfung).

Manufacturer's Declaration

This statement is provided to comply with the requirements of the German Sound Emission Directive, from
18 January 1991.

* Sound Pressure Lp <70 dB(A)
* At Operator Position
* Normal Operation
* According to EN 27779 (Type Test).

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual
containing minor corrections and updates may have the same printing date. Revised editions are
identified by a new printing date. A revised edition incorporates all new or corrected material since
the previous printing date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the
manual. In some cases, the manual change applies only to specific instruments. Instructions
provided on the change sheet will indicate if a particular change applies only to certain instruments.

This document contains proprietary information protected by copyright. All rights are reserved.
No part of this document may be photocopied, reproduced, or translated into another language
without the prior consent of Hewlett-Packard Company. The information contained in this
document is subject to change without notice.

 Copyright 1997 Hewlett-Packard Company Edition 1 __________November, 1997

6

Table of Contents

Warranty Information 2

Safety Summary 3
Declaration Page 5
Acoustic Noise Information 6
Printing History 6
Table of Contents 7

1 - QUICK REFERENCE 9

HP 66312A Dynamic Measurement DC Source and
HP 6611C/6612C/6613C/6614C System DC Power Supply 9
The Front Panel - At a Glance 10
Front Panel Number Entry 11
Front Panel Annunciators 12
Immediate Action Keys 12
Front Panel Menus - At a Glance 13
SCPI Programming Commands - At a Glance 14
The Rear Panel - At a Glance 15

2 - GENERAL INFORMATION 17

Document Orientation 17
Safety Considerations 18
Options and Accessories 18
Description 19

Capabilities 19
Front Panel Controls 19
Remote Programming 19
Output Characteristic 20

3 - INSTALLATION 21

Inspection 21

Damage 21
Packaging Material 21
Items Supplied 21
Cleaning 21

Location 22

Bench Operation 22
Rack Mounting 22

Input Connections 23

Connect the Power Cord 23

Output Connections 23

Wire Considerations 23
Current Ratings 23
Voltage Drops 24
Multiple Load Connections 24

Remote Sense Connections 25

Sense Leads 25
Stability 26

OVP Considerations 26
INH/FLT Connections 26
Controller Connections 28

HP-IB Interface 28
RS-232 Interface 29

7

4 - TURN-ON CHECKOUT 31

Introduction 31
Using the Keypad 31
Checkout Procedure 32
In Case of Trouble 34

Error Messages 34
Line Fuse 34

5 - FRONT PANEL OPERATION 35

Introduction 35
Front Panel Description 35
System Keys 37
Function Keys 38

Immediate Action Keys 38
Scrolling Keys 38
Metering Keys 39
Output Control Keys 40

Entry Keys 41
Examples of Front Panel Programming 42

1 - Setting the Output Voltage and Current 42
2 - Querying and Clearing Output Protection 43
3 - Making Front Panel Measurements 43
4 - Programming the Digital Output Port 45
5 - Programming the Output Relay (option 760 only) 46
6 - Setting the HP-IB Address and RS-232 Parameters 46
7 - Saving and Recalling Operating States 47

A - SPECIFICATIONS 49

Specifications 49
Supplemental Characteristics 50

B - VERIFICATION AND CALIBRATION 53

Introduction 53

Equipment Required 53
Test Setup 53

Performing the Verification Tests 54

Turn-On Checkout 55
Voltage Programming and Measurement Accuracy 55
Current Programming and Measurement Accuracy 55

Performing the Calibration Procedure 59

Front Panel Calibration Menu 59
Front Panel Calibration 60

Calibration Error Messages 62
Changing the Calibration Password 62
Calibration Over the HP-IB 63

C - ERROR MESSAGES 65

Error Number List 65

D - LINE VOLTAGE CONVERSION 69

Open the Unit 69
Configure the Power Transformer 69
Install the Correct Line Fuse 70
Close the Unit 70

INDEX 71

8

Quick Reference - 1

1

Quick Reference

HP 66312A Dynamic Measurement DC Source and
HP 6611C/6612C/6613C/6614C System DC Power Supply

The HP 66312A is a 40 Watt, high performance dc power supply that provides dynamic
measurement and analysis of voltage and current waveforms. It is designed to simplify the testing
of digital cellular and mobile phones. For example, data acquired using its dynamic measurement
capability can be used in determining the battery operating time of digital wireless communications
products.

The HP 6611C, 6612C, 6613C and 6614C are 40 and 50 Watt, high performance dc power
supplies with output current measurement capability in the microampere range. They are well
suited for testing portable battery-powered products.

Additionally, the combination of bench-top and system features in these dc sources provide
versatile solutions for your design and test requirements.

Convenient bench-top features

♦ Up to 50 Watts output power
♦ Easy to use knob for voltage and current settings
♦ Highly visible vacuum-fluorescent front panel display
♦ Excellent load and line regulation; low ripple and noise
♦ Measurement capability down to microampere levels
♦ Current sinking up to 30% of the rated current
♦ Instrument state storage
♦ Portable case

Flexible system features

♦ HP-IB (IEEE-488) and RS-232 interfaces are standard
♦ SCPI (Standard Commands for Programmable Instruments) compatibility
♦ Triggered acquisition of digitized output current and voltage waveforms (HP 66312A only)
♦ I/O setup easily done from the front panel

9

1 - Quick Reference

The Front Panel - At a Glance

j14-character

display shows output
measurements and
programmed values.

1

kAnnunciators

indicate operating
modes and status
conditions.

2

lRotary control

sets voltage, current,
and menu parameters.

Use and
to set the resolution;
then adjust the value
with the knob.

âá

3

mFront panel output

connectors.

4

5 6

nTurns the dc source

on and off.

o System keys:

♦ return to Local

mode

♦ set the HP-IB

address

♦ set the RS-232

interface

♦ display SCPI

error codes

♦ save and recall

instrument states.

7

p Function keys:

♦ enable/disable

output

♦ select metering

functions

♦ program voltage

and current

♦ set and clear

protection
functions

♦ and

scroll through the
front panel menu
commands.

•‚

8

qEntry keys:

♦ enter values
♦ increment or

decrement values

♦ and

select front panel
menu parameters.

♦ and

select a digit in
the numeric entry
field.

ãä

âá

10

Quick Reference - 1

Front Panel Number Entry

Enter numbers from the front panel using one of the following methods:

Use the arrow keys and knob to change voltage or current settings

NOTE The output must be ON to see the displayed values change in Meter mode.

Use the Function keys and knob to change the displayed settings

Use the arrow keys to edit individual digits in the displayed setting

Increments the flashing digit

Decrements the flashing digit

Moves the flashing digit to the right

Moves the flashing digit to the left

Enters the value when editing is complete

Use the Function keys and Entry keys to enter a new value

NOTE If you make a mistake, use the Backspace key to delete the number, or press the

Meter key to return to meter mode.

11

1 - Quick Reference

On/Off

Front Panel Annunciators

CV
CC
Unr
Dis

OCP

Prot

Cal

Shift
Rmt

Addr
Err

The output is operating in constant voltage mode.
The output is operating in constant current mode.
The output is unregulated.
The output is OFF. Press the Output On/Off key to turn the

output on.
The over-current protection state is ON. Press the OCP key to

turn over-current protection off.
Indicates that the output has been disabled by one of the

protection features. Press the Prot Clear key to clear the
protection condition.

Calibration mode is ON. Scroll to the Cal Off command and
press the Enter key to exit the calibration mode.

The Shift key has been pressed.
The selected Remote programming interface (either HP-IB or

RS-232) is active. Press the Local key to return the unit to
front panel control.

The interface is addressed to talk or listen.
There is an error in the SCPI error queue. Press the Error key

to view the error code.

SRQ

The interface is requesting service.

Immediate Action Keys

Output

Local

Prot ClrShift

OCPShift

12

A toggle switch that turns the output of the dc source on
or off.

Activates front panel control when the unit is in remote
mode (unless a Lockout command is in effect).

Resets the protection circuit and allows the unit to return
to its last programmed state.

A toggle switch that enables or disables overcurrent
protection.

Front Panel Menus - At a Glance

Address

Recall

Voltage

Meter

ADDRESS 7 Sets the HP-IB Address

‚
‚
‚
‚
‚

INTF HPIB Selects an interface (HPIB or RS232)
BAUDRATE 300 Selects baud rate (300, 600, 1200, 2400, 4800, 9600)
PARITY NONE Selects message parity (NONE, EVEN, ODD, MARK, SPACE)
FLOW NONE Selects flow control (XON-XOFF, RTS-CTS, DTR-DSR, NONE)
LANG SCPI Selects language (SCPI or COMP)

*RCL 0 Recalls instrument state

Quick Reference - 1

Meter

Current
Protect

Output

SaveShift
ErrorShift

*SAV 0 Saves present instrument state
ERROR 0 Displays errors in SCPI error queue

12.000V 0.204A Measures output voltage and current

‚
‚
‚
‚
‚
‚
‚
‚
‚
‚

12.500V MAX Measures peak output voltage

1.000V MIN Measures minimum output voltage

12.330V HIGH Measures the high level of a voltage pulse waveform

0.080V LOW Measures the low level of a voltage pulse waveform

12.000V RMS Measures rms voltage

0.350A MAX Measures peak output current

0.050A MIN Measures minimum output current

0.400A HIGH Measures the high level of a current pulse waveform

0.012A LOW Measures the low level of a current pulse waveform

0.210A RMS Measures rms current

1

1

1

1

1

1

1

1

1

1

VOLT 20.000 Sets the output voltage
CURR 2.000 Sets the output current
OC -- -- -- -- Protection status (example shows overcurrent tripped)
*RST Places the dc source in the factory-default state

‚
‚
‚
‚
‚
‚
‚
‚
‚

PON:STATE RST Select the power-on state command (RST or RCL0)
PROT:DLY 0.08 Sets the output protection delay in seconds
RI LATCHING Sets the remote inhibit mode (LATCHING, LIVE, or OFF)
DFI OFF Sets the discrete fault indicator state (ON or OFF)
DFI:SOUR OFF Selects the DFI source (QUES, OPER, ESB, RQS, or OFF)
PORT RIDFI Sets the output port functions (RIDFI or DIGIO)
DIGIO 7 Sets and reads the I/O port value (0 through 7)
RELAY ON Sets the output relay state (ON or OFF)
RELAY NORM Sets the output relay polarity (NORM or REV)

2

2

Shift
Shift Input

Use and to select menu parameters. Use to exit any menu and return to metering mode.

1

Not available on HP 6611C – 6614C or in Compatibility mode. 2Not available on HP 66312A.

OV

‚

CalShift

VOLT:PROT 22 Sets overvoltage protection level
CURR:RANG HIGH Sets current range (HIGH, LOW, or AUTO)

CURR:DET ACDC Sets current measurement detector (ACDC or DC)
CAL ON Accesses calibration menu (See User’s Guide).

ãä

1

13

1 - Quick Reference

SCPI Programming Commands - At a Glance

NOTE Most [optional] commands have been omitted for clarity. Refer to the

Programming Guide for a complete description of all programming commands.

ABORt SENSe
CALibrate

:CURRent [:POSitive] :DETector ACDC | DC

:MEASure :LOWRange :FUNCtion “VOLT” | “CURR”

1

:AC
:DATA <n> :POINts <n>
:LEVel P1 | P2 | P3 | P4 :TINTerval <n>
:PASSword <n> [SOURce:] CURRent <n>
:SAVE :TRIGgered <n>
:STATe <bool> [, <n>] :PROTection :STATe <bool>
:VOLTage :PROTection DIGital :DATA <n>

DISPlay

<bool> VOLTage <n>
:MODE NORMal | TEXT :TRIGgered <n>
:TEXT <display_string> :PROTection <n>

INITiate STATus

:SEQuence[1|21] :PRESet
:NAME TRANsient | ACQuire

1

:CONTinuous :SEQuence[1], <bool> :CONDition?

:NAME TRANsient, <bool> :ENABle <n>

MEASure | FETCh

:ARRay :CURRent?

2

:VOLTage?

1

1

[:CURRent][:DC]? :CONDition?

1

:ACDC?

1

:HIGH?

1

:LOW?

1

:MAX?

1

:MIN?

:VOLTage [:DC]? :LANGuage SCPI | COMPatibility

1

:ACDC?

1

:HIGH?

1

:LOW?

1

:MAX?

1

:MIN?

OUTPut

<bool> :COUNt :CURRent <n>
:DFI <bool> :VOLTage <n>
:SOURce QUES | OPER | ESB | RQS | OFF :HYSTeresis:CURRent <n>
:PON :STATe RST | RCL0 :VOLTage <n>
:PROTection :CLEar :LEVel :CURRent <n>

:DELay <n> :VOLTage <n>

:RELay [:STATe] <bool>

:POLarity NORM | REV

3

3

:RI :MODE LATCHing | LIVE | OFF :SOURce BUS | INTernal

1

Not available on HP 6611C - 6614C. :SOURce BUS

2

Fetch commands not available on HP 6611C – 6614C :SEQuence1 :DEFine TRANsient

3

Not available on HP 66312A :SEQuence2 :DEFine ACQuire

:CURRent :RANGe <n>

:SWEep :OFFSet :POINts <n>

:FUNCtion RIDF | DIG

:OPERation [:EVENt]?

:NTRansition <n>
:PTRansition <n>

:QUEStionable [:EVENt]?

:ENABle <n>
:NTRansition <n>
:PTRansition <n>

SYSTem

:ERRor?

:VERSion?
:LOCal
:REMote
:RWLock

TRIGger

:SEQuence 2 | :ACQuire [:IMMediate]

:SLOPe :CURRent POS | NEG | EITH

:VOLTage POS | NEG | EITH

[:SEQuence1 | :TRANsient][:IMMediate]

1

1

1

1

1

1

1

1

1

1

1

1

1

1

14

The Rear Panel - At a Glance

Quick Reference - 1

jHP-IB (IEEE-488)

interface connector

kRS-232 interface

connector

1

lINH/FLT (remote

INHibit / internal
FauLT) connector.
Connector plug is
removable.

2

mOutput and Remote

sense connector.
Connector plug is
removable.

3

5

nRemote or Local

sense switch

4

oFuse holder pPower cord

connector (IEC 320)

Use the front panel Address menu to

♦ Select the HP-IB or RS-232 interface (see chapter 4 in User’s Guide)
♦ Select the HP-IB bus address (see chapter 4 in User’s Guide)
♦ Configure the RS-232 interface (see chapter 4 in User’s Guide)

6

7

15

2

General Information

Document Orientation

This manual describes the operation of the HP Model 66312A Dynamic Measurement DC Source
and the HP Model 6611C, 6612C 6613C and 6614C System DC Power Supplies. Unless
otherwise noted, all units will be referred to by the description "dc source" throughout this manual.
The following documents and software are shipped with your dc source:

♦ a User's Guide (this document), contains installation, checkout, and front panel information
♦ a Programming Guide, contains detailed HP-IB programming information
♦ an HP VXIplug&play instrument driver, for Windows 95 and Windows NT 4.0

The following Getting Started Map will help you find the information you need to complete the
specific task that you want to accomplish. Refer to the table of contents or index of each guide for
a complete list of the information contained within.

Getting Started Map

Task Where to find information

Installing the unit

Line voltage connections
Computer connections
Load connections

Checking out the unit

Verifying proper operation
Using the front panel
Calibrating the unit

Using the front panel

Front panel keys
Front panel examples

Using the programming interface

HP-IB interface
RS-232 interface

Programming the unit using SCPI (and Compatibility)
commands

SCPI commands
SCPI programming examples
Compatibility language

Programming the unit using the HP VXIplug&play
instrument driver

Installing the instrument driver
Instrument driver functions
C/C++ example programs
Visual BASIC example programs
LabVIEW example programs
HP VEE example programs

User’s Guide

User’s Guide

User’s Guide

User’s Guide
Programming Guide

Programming Guide

HP VXIplug&play installation sheet
and on-line help

NOTE:
The driver must be installed on your computer to
access the on-line information.

Drivers for HP-UX are available on the web at
www.hp.com/go/power

17

2 - General Information

Safety Considerations

This dc source 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 dc source and review this guide for safety
warnings and instructions. Safety warnings for specific procedures are located at appropriate
places in the guide.

Options and Accessories

Table 2-1. Options

Option Description

100
220
230
760 Isolation and polarity reversal relays (not available on HP 66312A)

1

1CM

1

AXS

AXU Rack mount and slide kit for 2 side-by-side units of different depth. Consists of:

AXV Rack mount, slide kit, and support shelf for mounting one unit. Consists of:

1

Support rails are required when rack mounting units. Use E3663A support rails for HP rack cabinets, and

E3664A for non-HP rack cabinets.

0BN Service manual with extra operating manuals

87−106 Vac, 47−63 Hz
191−233 Vac, 47−63 Hz
207−253 Vac, 47−63 Hz

Rack mount kit for one unit (HP p/n 5062-3972)
Rack mount kit for 2 side-by-side units. Consists of:

Lock-link kit (HP p/n 5061-9694) and Flange kit (HP p/n 5062-3974)

Support shelf (HP p/n 5062-3996) and Slide kit (HP p/n 1494-0015)

Fill panel (HP p/n 5062-4022), Support shelf (HP p/n 5062-3996), and
Slide kit (HP p/n 1494-0015)

Table 2-2. Accessories

Item HP Part Number

HP-IB cables

1.0 meter (3.3 ft) 10833A

2.0 meters (6.6 ft) 10833B

4.0 meters (13.2 ft) 10833C

0.5 meters (1.6 ft) 10833D

RS-232 cable 34398A

(9-pin F to 9-pin F, 2.5 meter, null modem/printer cable
with one 9-pin M to 25-pin F adapter

RS-232 adapter kit (contains 4 adapters) 34399A

9-pin M to 25-pin M for pc or printer
9-pin M to 25-pin M for pc or printer
9-pin M to 25-pin M for modem
9-pin M to 9-pin M for modem

18

General Information - 2

Description

Both the HP 66312A Dynamic Measurement DC Source and the HP 6611C, 6612C, 6613C and
6614C System DC Power Supplies combine two instruments in one unit. They include a dc
source, which produces dc output with programmable voltage and current amplitude, and a
highly accurate voltage and current meter, with the capability to measure very low-level currents.
Additionally, the HP 66312A Dynamic Measurement DC Source has the ability to measure and
characterize output voltage and current of pulse or ac waveforms.

Capabilities

♦ Output Voltage and Current control with 12-bit programming resolution
♦ Extensive measurement capability:

dc voltage and current.
rms and peak voltage and current (HP 66312A only).
16-bit measurement resolution (low range accurate down to 2 microamperes).
Triggered acquisition of digitized current and voltage waveforms (HP 66312A

only).

♦ Front panel control with 14-character vacuum fluorescent display, keypad, and rotary

control for voltage and current settings.

♦ Built-in HP-IB and RS-232 interface programming with SCPI command language.
♦ Non-volatile state storage and recall with SCPI command language.
♦ Over-voltage, over-current, over-temperature, and RI/DFI protection features.
♦ Extensive selftest, status reporting, and software calibration.

Front Panel Controls

The front panel has both rotary (RPG) and keypad controls for setting the output voltage and
current. The panel display provides digital readouts of a number of output measurements.
Annunciators display the operating status of the dc source. System keys let you perform system
functions such as setting the HP-IB address and recalling operating states. Front panel Function
keys access the dc source function menus. Front panel Entry keys let you select and enter
parameter values. Refer to chapter 5 for a complete description of the front panel controls.

Remote Programming

NOTE: When shipped, all units are set to the SCPI programming language. The language

setting is saved in non-volatile memory.
To change the programming language from SCPI to Compatibility language,
press the front panel
press

Ì

to select SCPI, then press Enter. Refer to the Programming Guide

supplied with your dc source for further information about remote programming.

The dc source may be remotely programmed via the HP-IB bus and/or from an RS-232 serial
port. HP-IB programming is with SCPI commands (Standard Commands for Programmable
Instruments), which make the dc source programs compatible with those of other HP-IB
instruments. Compatibility commands are also included to make the dc source compatible with
the HP 6632A, 6633A, and 6634A Series dc power supplies (refer to appendix D in the the

Address key, use ô to scroll to the LANG command,

19

2 - General Information

Programming Guide). Dc source status registers allow remote monitoring of a wide variety of dc
source operating conditions.

Output Characteristic

The dc source’s output characteristic is shown in the following figure. The output of the dc
source may be adjusted to any value within the boundaries shown.

Output
Voltage

CV operating line

Vmax

VSET

-Isink

(60% Imax)

0

1

ISET

2

Imax

CC operating line

+-

Output

Current

Figure 2-1. Dc Source Output Characteristic

The dc source can operate in either constant voltage (CV) or constant current (CC) over the rated
output voltage and current. Although the dc source can operate in either mode, it is designed as a
constant voltage source. This means that the unit turns on in constant voltage mode with the
output voltage rising to its Vset value. There is no command for constant current operation. The
only way to turn the unit on in constant current mode is by placing a short across the output and
then enabling or turning the output on.

Note that the dc source cannot be programmed to operate in a specific mode. After initial turn­on, the operating mode of the unit will be determined by the voltage setting, the current setting,
and the load resistance. In figure 2-1, operating point 1 is defined by the load line traversing the
positive operating quadrant in the constant voltage region. Operating point 2 is defined by the
load line traversing the positive operating quadrant in the constant current region.

Figure 2-1 also shows a single range − two quadrant capability. This means that the dc source is
capable of sourcing as well as sinking current over the output voltage range from zero volts to the
rated maximum. The negative current sinking capability of the dc source is not programmable,
and is fixed at a maximum of approximately 60% of Imax.

NOTE: If you attempt to operate the dc source beyond its output ratings, the output of

the unit will become unregulated. This is indicated by the UNR annunciator on
the front panel. The output may also become unregulated if the ac input voltage
drops below the minimum rating specified in Appendix A.

Appendix A documents the dc source’s specifications and supplemental characteristics.

20

3

Installation

Inspection

Damage

When you receive your dc source, inspect it for any obvious damage that may have occurred
during shipment. If there is damage, notify the shipping carrier and the nearest HP Sales and
Support Office immediately. The list of HP Sales and Support Offices is at the back of this guide.
Warranty information is printed in the front of this guide.

Packaging Material

Until you have checked out the dc source, save the shipping carton and packing materials in case
the unit has to be returned. If you return the dc source for service, attach a tag identifying the
model number and the owner. Also include a brief description of the problem.

Items Supplied

The following user-replaceable items are included with your dc source. Some of these items are
installed in the unit.

Table 3-1. Items Supplied

Item Part Number Description

Power Cord contact nearest

HP Sales and

Support Office
Digital connector 1252-1488A 4-terminal digital plug that connects to the back of the unit.
Output connector 0360-2604A 5-terminal plug that connects to the back of the unit.
Line Fuse 2110-0303

2110-0007
Feet 5041-8801 feet for bench mounting
User's Guide 5962-8194 Contains installation, checkout, and front panel information.
Programming Guide 5962-8198 Contains detailed HP-IB programming information.

A power cord appropriate for your location.

2 A slow-blow for 100/120 Vac operation
1 A slow-blow for 220/230 Vac operation

Cleaning

Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not
attempt to clean internally.

WARNING: To prevent electric shock, unplug the unit before cleaning.

21

3 - Installation

17.5 (66312A only)

16.8 (66312A only)

Location

The outline diagram in figure 3-1 gives the dimensions of your dc source. The dc source must be
installed in a location that allows sufficient space at the sides and back of the unit for adequate air
circulation (see Bench Operation).

Bench Operation

A fan cools the dc source by drawing air in through the sides and exhausting it out the back.
Minimum clearances for bench operation are 1 inch (25 mm) along the sides.

Do not block the fan exhaust at the rear of the unit.

Rack Mounting

The dc source can be mounted in a standard 19-inch rack panel or cabinet. Table 2-1 documents
the HP part numbers for the various rack mounting options that are available for the dc source.
Installation instructions are included with each rack mount option.

NOTE: Support rails or an instrument shelf is required when rack mounting units.

368.3 mm

14.5 (6611C-6614C)

444.4 mm

350.5 mm

13.8 (6611C-6614C)

425.8 mm

Figure 3-1. Outline Diagram

22

Installation - 3

Input Connections

Connect the Power Cord

1. Unscrew the line fuse cap from the rear panel and verify that the fuse rating matches what is

specified on the FUSES label on the rear panel. Reinstall the fuse. (See table 3-1 for fuse part
numbers.)

2. 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 HP Sales and Support Office (refer to
the list at the back of this guide) to obtain the correct cord.

Output Connections

The output connector has a termination for the + and − output, the + and − sense terminals, and an
earth ground terminal. The 5-pin connector is removable and accepts wires sizes from AWG 22 to
AWG 12. Disconnect the mating plug from the unit by pulling it straight back.

Front panel binding posts are available to connect load wires for bench operation. The front panel
binding posts are paralleled with the rear panel + and − connections. Before using the front panel

binding posts, make sure that the sense switch on the back of the unit is set to Local.

NOTE: Front panel binding posts are provided for convenience. Only the rear panel

terminals are optimized for noise, regulation, and transient response as
documented in Appendix A.

Wire Considerations

To minimize the possibility of instability on the output,

♦ keep load leads as short as possible
♦ bundle or twist the leads tightly together to minimize inductance

Current Ratings

Fire Hazard To satisfy safety requirements, load wires must be large enough not to overheat

when carrying the maximum short-circuit current of the dc source. If there is more
than one load, then any pair of load wires must be capable of safely carrying the
full-rated current of the dc source.

The following table lists the characteristics of AWG (American Wire Gage) copper wire.

Table 3-2. Ampacity and Resistance of Stranded Copper Conductors

AWG No. Ampacity (in free air) Resistance (at 20 deg. C)

Ω/m Ω/ft

20 8.33 0.0345 0.01054
18 15.4 0.0217 0.00663
16 19.4 0.0137 0.00417
14 31.2 0.0086 0.00262
12 40 0.0054 0.00165

23

3 - Installation

Voltage Drops

The load wires must also be large enough to avoid excessive voltage drops due to the impedance of
the wires. In general, if the wires are heavy enough to carry the maximum short circuit current
without overheating, excessive voltage drops will not be a problem. The voltage drops across the
load wires should be limited to less than two volts. Refer to Table 3-2 to calculate the voltage drop
for some commonly used AWG copper wire.

Multiple Load Connections

When the unit is in local sensing mode and you are connecting multiple loads to the output, connect
each load to the output terminals using separate load leads. This minimizes mutual coupling
effects and takes full advantage of the dc source's low output impedance. Each pair of wires should
be as short as possible and twisted or bundled to reduce lead inductance and noise pickup.

If cabling considerations require the use of distribution terminals that are located remotely from the
dc source, connect the dc source’s 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, sense directly at the critical load.

NOTE: Connector

is removable

-S

- +

+S

. . . . .

+

50VDC MAX TO

-

-

+

+

LOAD 1

LOAD 2

LOAD 3

SENSE

Local
Remote

twist or bundle

each pair

24

Figure 3-2. Multiple Load Connections

Installation - 3

Remote Sense Connections

Under normal operation, the dc source senses the output voltage at the output terminals on the back
of the unit. External sense terminals are available on the back of the unit that allow the output
voltages to be sensed at the load, compensating for impedance losses in the load wiring. You

cannot remote sense at the front panel binding posts.

The output connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug
to make your wiring connections. When the sense wire connections are complete, set the
Remote/Local switch on the back of the unit to Remote (switch is out).

Sense Leads

The sense leads are part of the dc source's feedback path and must be kept at a low resistance (less
than several ohms) to maintain optimal performance. Connect the sense leads carefully so that they
do not become open-circuited. If the sense leads are left unconnected or become open during
operation, the dc source will regulate at the output terminals, resulting in a 3% to 5% increase in
output over the programmed value. Shorting the sense leads trips the OVP circuit.

NOTE: It is good engineering practice to twist and shield all signal wires to and from the

sense connectors. Connect the shield at the dc source end only. Do not use the
shield as one of the sensing conductors.

NOTE: Connector

is removable

twisted or

shielded pair

-S

-

+

. . . . .

+

50VDC MAX TO

-

-S

- +

+S

+S

SENSE

Local

Remote

sense

switch out

+

LOAD

-

Figure 3-3. Remote Sense Connections

25

3 - Installation

The overvoltage protection circuit senses voltage near the output terminals, not at the load.
Therefore the signal sensed by the OVP circuit can be significantly higher than the actual voltage
at the load. When using remote sensing, you must program the OVP trip voltage high enough to
compensate for the voltage drop between the output terminals and the load. Also, if the sum of the
programmed voltage and the load-lead drop exceeds the dc source's maximum voltage rating, this
may also trip the OV protection circuit.

Stability

When the unit is configured for remote sensing, it is possible for the impedance of the load wires
and the capacitance of the load to form a filter, which becomes part of the unit's feedback loop.
This can degrade the unit's stability and result in poor transient response performance. In extreme
cases it may also cause oscillations. The wiring guidelines previously discussed under "Wire
Considerations" will eliminate most stability problems associated with load lead inductance. If
additional measures are required:

♦ keep the load capacitance as small as possible
♦ use larger diameter load wires to reduce resistance

OVP Considerations

The dc source's OVP circuit contains a crowbar SCR, which effectively shorts the output of the dc
source whenever the OVP trips. If an external voltage source such as a battery is connected across
the output and the OVP is inadvertently triggered, the SCR will continuously sink a large current
from the battery, possibly damaging the dc source.

To avoid this, program the OVP setting to its maximum value to prevent it from inadvertently
tripping. Additionally, an internal fuse is connected in series with the SCR. This fuse will open to
prevent large currents from damaging the SCR. If this internal fuse has opened, The FS status
annunciator will be set. Refer to the Service Manual for instructions about replacing this fuse.

In addition, the OVP circuit's SCR crowbar has been designed to discharge capacitances up to a
specific limit. This limit is:

HP 6611C
HP 6612C and 66312A

If your load capacitance approaches this limit, it is recommended that you do not intentionally trip
the OVP and discharge the capacitance through the SCR as part of your normal testing procedure,
as this may lead to long-term failure of some components.

127,000 µF.
50,000 µF.

HP 6613C
HP 6614C

20,000 µF.
10,000 µF.

INH/FLT Connections

This rear panel connector, has a fault output port and an inhibit input port. The fault (FLT) output,
also referred to as the DFI (discrete fault indicator) signal in the front panel and SCPI commands,
is an open collector circuit that pulls the positive output low with respect to the negative (chassis­referenced) common. The high impedance inhibit (INH) input, also referred to as the RI (remote
inhibit) signal in the front panel and SCPI commands, is used to shut down the power supply
output whenever the INH + is pulled low with respect to the INH (chassis-referenced) common.

26

Installation - 3

B) FLT Example with Multiple Units

The connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug to make
your wire connections.

NOTE: It is good engineering practice to twist and shield all signal wires to and from the

digital connectors. If shielded wire is used, connect only one end of the shield to
chassis ground to prevent ground loops.

Figure 3-4 shows how you can connect the FLT/INH circuits of the dc source.
In example A, the INH input connects to a switch that shorts the Inhibit pin (+) to common

whenever it is necessary to disable output of the unit. This activates the remote inhibit (RI) circuit,
which turns off the dc output. The front panel Prot annunciator comes on and the RI bit is set in
the Questionable Status Event register. To re-enable the unit, first open the connection between
pins INH + and common and then clear the protection circuit. This can be done either from the
front panel or over the HP-IB/RS-232.

In example B, the FLT output of one unit is connected to the INH input of another unit. A fault
condition in one of the units will disable all of them without intervention either by the controller or
external circuitry. The controller can be made aware of the fault via a service request (SRQ)
generated by the Questionable Status summary bit. Note that the FLT output can also be used to
drive an external relay circuit or signal other devices whenever a user-definable fault occurs.

NOTE: Connectors

INH FLT

. . . .

+ - +

are removable

INH Input

INH Common

A) INH Example with One Unit

Figure 3-4. FLT/INH Examples

Switch

(Normally

Open)

INH FLT

. . . .

+ - +

INH
Input

INH
Input

FLT
Output

FLT
Output

27

3 - Installation

B) Digital Interface Circuits

A) Relay Circuits

INH FLT

. . . .

NOTE: Connectors

are removable

+ - +

Digital Input

Port 2

Relay Driver

Ports 0, 1, 2

(

contains internal

clamp diodes for

inductive

flyback)

Digital Output

Ports 0, 1, 2

TTL, AS, CMOS, HC

+16.5V Max.

Digital I/O Connections

As shown in Table 3-3 and Figure 3-5, the FLT/INH connector can also be configured as a digital
I/O port. Information on programming the digital I/O port is found in chapter 5 and under
[SOURce:]DIGital:DATA and [SOURce:]DIGital: FUNCtion commands in the Programming
Guide. The electrical characteristics of the digital connector are described in appendix A.

Table 3-3. FLT/INH DIGital I/O Connector

PIN FAULT/INHIBIT DIGITAL I/O

1 FLT Output Output 0
2 FLT Common Output 1
3 INH Input Input/Output 2
4 INH Common Common

Coil Current

0.25A Max.

Controller Connections

The dc source connects to a controller either through an HP-IB or an RS-232 connector.

HP-IB Interface

Each dc source has its own HP-IB bus address, which can be set using the front panel Address
key as described in chapter 5. HP-IB address data is stored in non-volatile memory. The dc source
is shipped with its HP-IB address set to 5.

Dc sources may be connected to the HP-IB interface in series configuration, star configuration, or
a combination of the two, provided the following rules are observed:

28

Figure 3-5. Digital I/O Examples

Installation - 3

♦ The total number of devices including the controller is no more than 15.
♦ The total length of all cables used is no more than 2 meters times the number of devices

connected together, up to a maximum of 20 meters. (Refer to table 2-2 for a list of HP-IB
cables available from Hewlett-Packard.)

♦ Do not stack more than three connector blocks together on any HP-IB connector.
♦ Make sure all connectors are fully seated and the lock screws are firmly finger-tightened.

RS-232 Interface

The dc source has an RS-232 programming interface, which is activated by commands located in
the front panel Address menu. All SCPI and COMPatibility commands are available through RS­232 programming. When the RS-232 interface is selected, the HP-IB interface is disabled.

The RS-232 connector is a DB-9, male connector. Adapters are available to connect the dc source
to any computer or terminal with a properly configured DB-25 connector (see Table 2-2).

1 2 3 4 5

6 7 8 9

Figure 3-6. RS-232 Connector

Pin Input/Output Description

1 - no connection

2 Input Receive Data (RxD)

3 Output Transmit Data (TxD)

4 Output Data Terminal Ready (DTR)

5 Common Signal ground

6 Input Data Set Ready (DSR)

7 Output Request to Send (RQS)

8 Input Clear to Send (CTS)

9 - no connection

29

4

Turn-On Checkout

Introduction

Successful tests in this chapter provide a high degree of confidence that the dc source is operating
properly. For verification tests, see appendix B. Complete performance tests are given in the
Service Guide.

NOTE: This chapter provides a preliminary introduction to the dc source front panel. See

chapter 5 for more details.

Using the Keypad

(shift) Some of the front panel keys perform two functions, one labeled in black and the

other in blue. You access the blue function by first pressing the blue shift key.
Release the key after you press it. The Shift annunciator will be on, indicating that
you have access to any key's shifted function.

Enter Number

and These keys let you scroll up and down through the choices in the presently selected

p

and These keys let you select the previous or the next parameter for a specific command. If

and

Back space

Enter

q

Used to access a third level key function, the numeric entry keys. These third level
function keys are labeled in green.

function menu. All menu lists are circular; you can return to the starting position by
continuously pressing either key.

äã

the command has a numeric range, these keys increment or decrement the existing
value. In meter mode, these keys can be used to adjust the magnitude of the output
voltage or current. Only the flashing digit is changed by these keys. Use the á and
â keys to move the flashing digit.

These Entry keys move the flashing digit in a numeric entry field to the right or left.

âá

This lets you increment or decrement a specific digit in the entry field using the ã
and ä keys or the rotary control knob.

The backspace key is an erase key. If you make a mistake entering a digit and have
not yet pressed Enter, you can delete the digit by pressing Backspace. Delete more
digits by repeatedly pressing this key.

Executes the entered value or parameter of the presently accessed command. Until you
press this key, the parameters you enter with the other keys are displayed but not
entered into the dc source. After pressing Enter, the dc source returns to Meter mode.

31

4 - Turn-On Checkout

Checkout Procedure

The tests in this section checks for output voltage and current on the dc source.
NOTE: To perform the checkout procedure, you will need a wire for shorting the output

terminals together.

The following procedure assumes that the unit turns on in the factory-default state. If you need
more information about the factory default state, refer to the *RST command in chapter 4 of the
Programming Guide. Note that the values shown in the Display column may not exactly match the
values that appear on the front panel of your unit.

If you have not already done so, connect the power cord to the unit and plug it in.

Table 4-1. Checkout Programming Values

Model Voltage OV Prot Current Note:

6611C

6612C/66312A

6613C
6614C

Procedure Display Explanation

8
20
50

100

12
22
55

110

5
2
1

0.5

The checkout procedure is written for models
6612C and 66312A. If you have another
model, enter the correct values from the table
where the procedure calls for an <input>.

1. Turn the unit on. The dc
source undergoes a self­test when you first turn it
on.

**********

ADDRESS 5

0.002V .0006A

During selftest, all display segments are briefly
lit, followed by the HP-IB Address.

The display then goes into meter mode with the
Dis annunciator on, and all others off. In Meter
mode the *****V digits indicate the output
voltage and the *****A digits indicate the
output current. The flashing digit on the display
indicates the digit that will be affected if changes
are made to the displayed values using the rotary
control or the ã and ä keys. You will only see
the changes if the output is ON.

NOTE: Press the Meter key to exit a menu at any time and return to meter mode. If the Err

annunciator on the display is on, press the Shift key followed by the Error key to
see the error number. See table 4-2 at the end of this chapter.

2. Check that the dc source
fan is on

3. Press Voltage,

Enter Number,
<2, 0>, Enter

VOLT 0.000
VOLT <20>

You should be able to hear the fan and feel the
air coming from the back of the unit.

Programs the output to 20 volts. After the value
is entered, the display returns to Meter mode.
Because the output has not been enabled, the
meter still indicates approximately 0 volts.

4. Press Output On/Off <20.003>V

0.0006A

5. Press Shift, OV VOLT:PROT

<22.00>

32

Turns the output on. The Dis annunciator should
be off and CV should be on.

Display shows the overvoltage protection trip
voltage for your unit.

Procedure Display Explanation

Turn-On Checkout - 4

6. Press Enter Number,
8, Enter

7. Press Shift, OV,
Enter Number,
<2, 2>, Enter

8. Press Shift, Prot Clear <20.003>V

9. Press Output on/off Turn the output off.

10. Connect a jumper wire
across the + and - output
terminals.

11. Press Output on/off. 0.0005V

VOLT:PROT 8

0.449V 0.145A

VOLT:PROT <22> Programs the OVP to a value greater than the

0.0034A

<0.2005>A

Programs the OVP to 8 volts, which is less than
the previously set output voltage.

Because the OVP voltage entered was less than
the output voltage, the OVP circuit tripped. The
output dropped to zero, CV turned off, and Prot
turned on.

output voltage setting of the unit. This prevents
the OV circuit from tripping again when the
protection condition is cleared.

Clears the protection condition, thus restoring
the output of the unit. Prot turns off and CV
turns on.

Shorts the output of the unit.

The CC annunciator is on, indicating that the
unit is in constant current mode. The unit is
sourcing output current at 10% of the maximum
rating (the default output current limit setting).

12. Press Current,

Enter Number,
<2>, Enter.

13. Press Shift, OCP 0.0005V 0.0003A You enabled the overcurrent protection circuit.

14. Press Shift, OCP 0.0005V 0.0003A You have disabled the overcurrent protection

15. Press Shift, Prot Clear 0.0452V

16. Turn the unit off and
remove the shorting wire
from the output terminals.

0.0452V

<1.998>A

<1.998>A

Programs the output current to <2> ampere.

The circuit then tripped because the unit was
operating in constant current mode. The CC
annunciator turns off and the OCP and Prot
annunciators come on.

circuit. The OCP annunciator turns off.

Restores the output. The Prot annunciator turns
off. CC is on.

The next time the unit turns on it will be
restored to the *RST or factory default state.

33

4 - Turn-On Checkout

In Case of Trouble

Error Messages

Dc source failure may occur during power-on selftest or during operation. In either case, the
display may show an error message that indicates the reason for the failure.

Selftest Errors

Pressing the Shift, Error keys will show the error number. Selftest error messages appear as:
ERROR <n> where "n" is a number listed in the following table. If this occurs, turn the power off
and then back on to see if the error persists. If the error message persists, the dc source requires
service.

Table 4-2. Power-On Selftest Errors

Error No. Failed Test

Error 0 No error
Error 1 Non-volatile RAM RD0 section checksum failed
Error 2 Non-volatile RAM CONFIG section checksum failed
Error 3 Non-volatile RAM CAL section checksum failed
Error 4 Non-volatile RAM STATE section checksum failed
Error 5 Non-volatile RST section checksum failed
Error 10 RAM selftest
Error 11 to 14 VDAC/IDAC selftest 1 to 4
Error 15 OVDAC selftest
Error 80 Digital I/O selftest error

Runtime Error Messages

Appendix C lists other error messages that may appear at runtime. If the front panel display shows
OVLD , this indicates that the output voltage or current is beyond the range of the meter readback
circuit. If the front panel display indicates -- -- -- -- -- -- , an HP-IB measurement is in progress.

Line Fuse

If the dc source appears "dead" with a blank display and the fan not running, check your power
source to be certain line voltage is being supplied to the dc source. If the power source is normal,
the dc source fuse may be defective.

1. Turn off the front panel power switch and unplug the power cord.

2. Remove the fuse from the rear panel.

3. If the fuse is defective, replace it with a fuse of the same type (see "Input Connections" in

chapter 3).

4. Turn on the dc source and check the operation.

NOTE: If the dc source has a defective fuse, replace it only once. If it fails again, the dc

source requires service.

34

Front Panel Operation

Introduction

Here is what you will find in this chapter:

♦ a complete description of the front panel controls
♦ front panel programming examples

NOTE: The dc source must be in set to Local mode to use the front panel controls. Press

the Local key on the front panel to put the unit in local mode.

Front Panel Description

5

1

5 6

2

7

Figure 5-1. Front Panel, Overall View

3

4

8

35

5 - Front Panel Operation

j Display

k Annunciators

l Rotary Control

m Output

Connectors

14-character vacuum fluorescent display for showing output measurements
and programmed values.

Annunciators light to indicate operating modes and status conditions:

CV The dc source output is in constant-voltage mode.
CC The dc source output is in constant-current mode.
Unr The dc source output is in an unregulated state.
Dis The dc source output is disabled (off).
OCP The overcurrent protection state is enabled.
Prot One of the dc source's output protection features is activated.
Cal The dc source is in calibration mode.
Shift The Shift key is pressed to access an alternate key function.
Rmt The selected interface (HP-IB or RS-232) is in a remote state.
Addr The interface is addressed to talk or to listen.
Err There is a message in the SCPI error queue.
SRQ The interface is requesting service from the controller.

The rotary control lets you set the output voltage or current as well as menu
parameters. Press á and â to select the resolution, then adjust the value
with the knob.

Front panel binding posts let you connect loads to the front of the unit.
Before using the front panel binding posts, make sure that the sense switch
on the back of the unit is set to Local.

n Line
o System Keys

p Function Keys

q Entry Keys

This turns the dc source on or off.
The system keys let you:

Return to Local mode (front panel control)
Set the dc source HP-IB address
Set the RS-232 interface communication baud rate and parity bit
Display SCPI error codes and clear the error queue
Save and recall up to 4 instrument operating configurations

Function access command menus that let you:

Enable or disable the output
Select metering functions
Program output voltage and current
Display the protection status state
Set and clear protection functions
Set the output state at power-on
Calibrate the dc source

p and q scroll through the front panel menu commands
Entry keys let you:

Enter programming values
Increment or decrement programming values
ã and ä select the front panel menu parameters

36

Front Panel Operation - 5

Local

Address

qpã

ä

Recall

System Keys

Refer to the examples later in this chapter for more details on the use of these keys.

SYSTEM

Error

Local

Figure 5-2. System Keys

Address

Save

Recall

This is the blue, unlabeled key, which is also shown as in this guide.

Shift

Pressing this key accesses the alternate or shifted function of a key (such as

ERROR ). Release the key after you press it. The Shift annunciator is lit,

indicating that the shifted keys are active.
Press to change the dc source's selected interface from remote operation to local

(front panel) operation. Pressing the key will have no effect if the interface state is
already Local, Local-with-Lockout, or Remote-with-Lockout.

Press to access the system address menu. This menu lets you configure the dc
source's interface. Address Menu entries are stored in non-volatile memory.

Display Command Function

ADDRESS <value> Sets the HP-IB Address
INTF <char> Selects an interface (HPIB or RS232)
BAUDRATE<value> Selects baud rate (300, 600, 1200, 2400, 4800, 9600)
PARITY <char> Message parity (NONE, EVEN, ODD, MARK, SPACE)
FLOW <char> Flow control (XON-XOFF, RTS-CTS, DTR-DSR, NONE)
LANG <char>I Selects language (SCPI or COMP)

value = a numeric value
char = a character string parameter
Use and to scroll through the command list.
Use and to scroll through the parameter list.

Shift

Error

SaveShift

Press to place the dc source into a previously stored state. You can recall up to 4
(0 through 3) previously stored states.

Press to display the system error codes stored in the SCPI error queue. This action
also clears the queue. If there is no error in the queue, 0 is displayed.

Press to store an existing dc source state in non-volatile memory. The parameters
saved are listed under *SAV in the dc source Programming Guide. You can save
up to 4 states (0 through 3).

37

5 - Front Panel Operation

On/Off

Function Keys

Refer to the examples later in this chapter for more details on the use of these keys.

FUNCTION

Input

OV

Meter

Protect

Voltage

Current

Output

CalOCPProt Cir

Output
On/Off

Figure 5-3. Function Keys

Immediate Action Keys

Immediate action keys immediately execute their corresponding function when pressed. Other
function keys have commands underneath them that are accessed when the key is pressed.

Output

Prot ClrShift

OCPShift

This key toggles the output of the dc source between the on and off states. It
immediately executes its function as soon as you press it. When off, the dc source
output is disabled and the Dis annunciator is on.

Press this key to reset the protection circuit and allow the unit to return to its last
programmed state. The condition that caused the protection circuit to become
active must be removed prior to pressing this key, or the unit will shut down
again and display the Prot annunciator again. (If FS protection is displayed on
the front panel, the unit must be opened and an internal fuse replaced as
described in the Service manual.)

Press this key to toggle between OCP enabled and disabled. If OCP is enabled
the output will become disabled if the output mode changes from CV to CC
mode. The OCP annunciator indicates the state of OCP.

Scrolling Keys

Scrolling keys let you move through the commands in the presently selected function menu.

• ‚

38

Press to bring up the next command in the list. Press to go back
to the previous command in the list. Function menus are circular; you can return
to the starting position by continuously pressing either key. The following
example shows the commands in the Input function menu:

q
q

CURR:RANGE <char>
CURR:DET <char>

pq

Front Panel Operation - 5

qpãäá

â

Metering Keys

Metering keys control the metering functions of the dc source. When the unit is operating in front
panel meter mode, all front panel measurements are calculated from a total of 2048 readings taken
at a 46.8 microsecond sampling rate. Therefore, the total acquisition time for a single front panel
measurement is about 100 milliseconds. Refer to “Making Front Panel Measurements” for more
information.

NOTE: You can vary the both the sampling rate and the number of data points in each

measurement when controlling the unit over the HP-IB interface. (Refer to chapter
3 in the Programming Guide).

Meter

Shift Input

Press this key to access the meter menu list. Also use this key to exit a menu at
any time and return to meter mode.

Display Measurement

<reading>V
<reading>A

<reading>V MAX Measures peak output voltage
<reading>V MIN Measures minimum output voltage
<reading>V HIGH Measures the high level of a voltage pulse waveform
<reading>V LOW Measures the low level of a voltage pulse waveform
<reading>V RMS Measures rms voltage
<reading>A MAX Measures peak output current
<reading>A MIN Measures minimum output current
<reading>A HIGH Measures the high level of a current pulse waveform
<reading>A LOW Measures the low level of a current pulse waveform
<reading>A RMS Measures rms current

Measures output dc voltage and current

1

1

1

1

1

1

1

1

1

1

Press this key to access the following metering functions.

Display Command Function

CURR:RANGE <char> Select current range (AUTO, LOW or HIGH)
CURR:DET <char> Select current measurement bandwidth (ACDC or DC)

Notes:

1

Not available on HP 6611C - 6614C or in Compatibility mode
reading = the returned measurement
value = a numeric value
char = a character string parameter
Use and to scroll through the menu commands.
Use and to scroll through the menu parameters.
Use and to select a digit in a numeric entry field.

1

39

5 - Front Panel Operation

qpãäá

â

Current

Output Control Keys

Output control keys control the output functions of the dc source.

Voltage

Press this key to access the voltage menu.

Display Command Function

VOLT <value> Sets the output voltage

Press this key to access the current menu.

Display Command Function

CURR <value> Sets the output current

Output

Protect

Press this key to access the output menu list.

Display Command Function

*RST Places the dc source in the factory-default state
PON:STATE <char> Select the power-on state command (RST or RCL0)
RI <char> Sets the remote inhibit mode (LATCHING, LIVE, or OFF)

1

1

DFI <char> Sets the discrete fault indicator state (ON or OFF)
DFI:SOUR <char> Selects the DFI source (QUES, OPER, ESB, RQS, or OFF)
PORT <char> Sets the output port functions (RIDFI or DIGIO)

1

2

DIGIO <char> Sets and reads the I/O port value (0 through 7)
RELAY <char>
REL:POL <char>

Set relay state independent of output (``ON'' or ``OFF'')
Set relay polarity (``NORM'' or ``REV'')

3

3

PROT:DLY <value> Sets the output protection delay in seconds

Press this key to display protection status.

Display Command Function

OC OT OV RI FS Status of the protection features (example shows all tripped)

-- -- -- -- -- Status of the protection features (example shows none tripped)

40

OVShift

CalShift

Notes:

Press this key to access the overvoltage protection menu.

Display Command Function

VOLT:PROT <value> Sets overvoltage protection level

This key accesses the calibration menu (Refer to Appendix B for details).

1

These parameters are stored in non-volatile memory

2

These status summary bits are explained in chapter 3 of the Programming Guide

3

Not available on HP 66312A
value = a numeric value
char = a character string parameter
Use and to scroll through the menu commands.
Use and to scroll through the menu parameters.
Use and to select a digit in a numeric entry field.

Front Panel Operation - 5

Entry Keys

Refer to the examples later in this chapter for more details on the use of these keys.

Cir Entry

Enter

-

1

Enter Number

­ ,

.

Back space

Shift
Clear Entry

Enter

2 3 4 5

6

7

8 9 0

Figure 5-4. Entry Keys

äã

These keys let you scroll through choices in a parameter list that apply to a
specific command. Parameter lists are circular; you can return to the starting
position by continuously pressing either key. If the command has a numeric
range, these keys increment or decrement the existing value. In meter mode, these
keys can be used to adjust the magnitude of the output voltage or current. Only
the flashing digit is changed by these keys. Use the á and â keys to move
the flashing digit.

âá

These keys move the flashing digit in a numeric entry field to the right or left.
This lets you increment or decrement a specific digit in the entry field using the

ã and ä keys or the RPG knob.

Used only to access a third level key function - the numeric entry keys. These
third level function keys are labeled in green.

90

−

0 through 9 are used for entering numeric values. . is the decimal point. − is the

minus sign. For example, to enter 33.6 press: Enter Number, 3, 3, . , 6,

Enter.

The backspace key deletes the last digit entered from the keypad. This key lets
you correct one or more wrong digits before they are entered.

This key aborts a keypad entry by clearing the value. This key is convenient for
correcting a wrong value or aborting a value entry. The display then returns to
the previously set function.

This key executes the entered value or parameter of the presently accessed
command. Until you press this key, the parameters you enter with the other Entry
keys are displayed but not entered into the dc source. Before pressing Enter, you
can change or abort anything previously entered into the display. After Enter is
pressed, the dc source returns to Meter mode.

.

Number

Enter

ENTRY

Backspace

41

5 - Front Panel Operation

Examples of Front Panel Programming

You will find these examples on the following pages:
1 Setting the output voltage and current
2 Querying and clearing output protection
3 Making front panel measurements
4 Programming the digital port
5 Programming the output relay (option 760 only)
6 Setting the HP-IB address or RS-232 parameters
7 Saving and recalling operating states
Similar examples are given in the dc source Programming Guide using SCPI commands.

1 - Setting the Output Voltage and Current

Set the output voltage

Action Display

1. To enter an approximate value without using the voltage menu: On the Entry

keypad, press á or â to select the 1's digit in the voltage field. Then rotate
the front panel RPG knob to obtain 7 V.

If the unit is in CC mode, you won't see the output voltage change until the
voltage setting is low enough to cause the unit to go into CV mode.

7.003V 0.004A

2. The easiest way to enter an accurate value: On the Function keypad, press

Voltage. On the Entry keypad, press 7, Enter.

3. To make minor changes to an existing value: On the Function keypad, press

Voltage. On the Entry keypad, press á or â to select the digit in the
numeric field that you wish to change. For example, move the flashing digit
to the ones column to change a value in this column. Then, press ã to scroll
from 7.000 to 8.000. Then press Enter.

Set the output current

Action Display

1. To enter an approximate value without using the current menu: On the Entry

keypad, press á or â to select the tenths digit in the current field. Rotate the
front panel RPG knob to obtain 0.4A.

If the unit is in CV mode, you won't see the output current change until the
current setting is low enough to cause the unit to go into CC mode.

2. The easiest way to enter an accurate value: On the Function keypad, press

Current. On the Entry keypad, press ., 4, Enter.

3. To make minor changes to an existing value: On the Function keypad, press

Current. On the Entry keypad, press á or â to select the digit in the
numeric field that you wish to change. For example, move the flashing digit
to the tenths column to change a value in this column. Then, press ã to
scroll from 0.400 to 0.500. Then press Enter.

VOLT 7.000

VOLT 8.000

8.003V 0.400A

CURR 0.400

CURR 0.500

Enable the output

Action Display

1. On the Function keypad, press Output On/Off to enable the output. The

Dis annunciator will go off, indicating that the voltage is now applied to the
output terminals. The A display indicates the actual output current.

42

8.003V 0.500A

Front Panel Operation - 5

2 - Querying and Clearing Output Protection

The dc source will disable its output if it detects an overvoltage or overcurrent fault condition.
Other automatic fault conditions (such as overtemperature) also will disable the output.

Query and clear the dc source overcurrent protection feature as follows:

Action Display

1. On the Function keypad, press Protect. In this example, OC indicates that

an overcurrent condition has occurred. Other protection indicators are: OT
(overtemperature), OV (overvoltage), RI (remote inhibit), and FS (internal
fuse is open).

2. On the Function keypad, press Current. This displays the present output

current limit. (10% of the maximum rating is the default current limit
setting).

3. To restore normal operation after the cause of the overcurrent condition has

been removed, press Shift, Prot Clr. The OCP annunciator then will go
off.

OC -- -- -- --

CURR 0.2045

(2 amp unit)

3 - Making Front Panel Measurements

When the dc source is operating in front panel meter mode, all front panel measurements are
calculated from a total of 2048 readings taken at a 46.8 microsecond sampling rate. The unit
alternates between voltage and current measurements. Therefore, the data acquisition time for a
single front panel voltage or current measurement is about 100 milliseconds. The sample rate and
number of data points are fixed, and there are no trigger controls for front panel measurements.
This fixed sampling rate and data acquisition time combined with a built-in windowing function,
reduces errors due to sampling a non-integral number of cycles of a waveform for frequencies of
25 Hz or greater. Note that the windowing function is less accurate when measuring output
waveforms for frequencies less than 25 Hz, causing the front panel meter to jitter.

When controlling the unit over the HP-IB interface, you can vary both the sampling rate and the
number of data points in each measurement. If you are using the HP 66312A dc source to measure
waveform data, the HP-IB interface also lets you qualify the triggers that initiate the
measurements. With this flexibility, measurement accuracy can be improved for waveforms with
frequencies as low as several Hertz. Refer to chapter 3 in the Programming Guide for more
information.

Two current measurement ranges can be selected in the Input menu. A high current range is
available for measuring output currents up to 30% higher than the maximum rating of the dc
source. A low current range is available for improved resolution when measuring output currents
below 20 milliamperes. The low current measurement range is accurate to 0.1% of the reading
±2.5 microamperes. When the current Range is set to AUTO, the unit automatically selects the
range that provides the best measurement resolution.

NOTE: If the front panel display indicates OVLD, the output has exceeded the

measurement capability of the instrument. If the front panel display indicates

-- -- -- -- -- -- , an HP-IB measurement is in progress.

43

5 - Front Panel Operation

As previously mentioned, the HP 66312A dc source has the capability of measuring output
waveform parameters such as peak, minimum, high level, and low level as illustrated in the
following figure.

V or A MAX

V or A HIGH

V or A LOW

V or A MIN

100 millisecond
acquisition time

46.8 microsecond
sampling rate

NOTE:

Measurement samples may not
coincide with the actual maximum

or minimum point of the waveform.

Figure 5-5. Front Panel Pulse Measurement Parameters (HP 66312A only)

Use the Meter menu for making front panel measurements:

Action Display

1. For current measurements, press Shift, Input. Then press ä until you

obtain the CURR:RANG AUTO command. Press Enter to activate
autoranging. Two other selections are also available. Select the High
range when measuring currents above 20 mA. Select the Low range for
improved resolution when measuring currents below 20 mA.

CURR:RANG AUTO

2. For output waveform measurements, press Shift, Input. Then press q

CURR:DET ACDC
until you obtain the CURR:DET command. Check to make sure that the
ACDC current detector is selected. This provides the best accuracy for
waveform measurements. Only select the DC current detector if you are
making dc current measurements and you require a dc measurement
offset better than 1mA on the High current measurement range.

Note: In the Low current measurement range, the current detector is fixed at DC. With

the current detector in dc, accurate current measurements cannot be made on
waveforms with frequency contents over a few kilohertz.

3. On the Function keypad press Meter and press q repeatedly

to access the following measurement parameters:

♦ dc voltage and current
♦ peak voltage
♦ minimum voltage

1

1

♦ high level of a voltage pulse waveform
♦ low level of a voltage pulse waveform
♦ rms voltage
♦ peak current
♦ minimum current

1

1

1

♦ high level of a current pulse waveform
♦ low level of a current pulse waveform
♦ rms current

1

HP 66312A only

1

1

1

1

1

<reading>V <reading>A
<reading>V MAX
<reading>V MIN
<reading>V HIGH
<reading>V LOW
<reading>V RMS
<reading>A MAX
<reading>A MIN
<reading>A HIGH
<reading>A LOW
<reading>A RMS

44

Front Panel Operation - 5

4 - Programming the Digital Output Port

Your dc source is shipped with the output port function set to RIDFI mode. In this mode the port
functions as a remote inhibit input with a discrete fault indicator output signal. You can also
configure the port to act as a Digital Input/Output device.

To configure the RIDFI mode of the port, proceed as follows:

Action Display

1. On the Function keypad, press Output. *RST

2. Scroll through the Output menu by pressing q . The PORT command

lets you select either the RIDFI or the DIGIO function.

3. Scroll to the RI command to configure the Remote INHibit indicator.

Use the ã and ä keys to select either LIVE or LATCHING, either of
which enable the RI indicator. With RI enabled, a low-true on the INH
input will disable the output of the unit. LIVE causes the output of the
unit to track the state of the INH input. LATCHING latches the output
of the unit off in response to the inhibit signal.

4. Access the Output menu again and scroll through the menu. The DFI

command lets you enable the Discrete Fault Indicator. Use the ä key
and select ON to enable the FLT output. With the FLT output enabled,
the open-collector logic signal can be used to signal external devices
when a fault condition is detected.

5. Scroll to the DFI:SOUR command to select the internal source that

drives this signal. Use the ä key to select from the RQS or ESB bits, or
the Operation or Questionable status registers. Status summary bits are
explained in chapter 3 of the Programming Guide.

PORT RIDFI

RI LIVE

RI LATCHING

DFI ON

DFI:SOUR RQS

DFI:SOUR ESB

DFI:SOUR OPER

DFI:SOUR QUES

To configure the DIGIO mode of the port, proceed as follows:

Action Display

1. On the Function keypad, press Output. *RST

2. Scroll through the Output menu by pressing q. The PORT command

lets you select either the RIDFI or the DIGIO function.

PORT DIGIO

3. Scroll to the DIGIO command to set and read the Digital Input/Output

Port. Press Enter Number and enter a number from 0 to 7 to program
the four bits (0 programs all bits low; 7 programs all bits high). Press
Enter when done.

DIGIO 5

45

5 - Front Panel Operation

5 - Programming the Output Relay (option 760 only)

Units with option 760 have isolation and polarity reversal relays connected to the output and sense
terminals. (Option 760 is not available on HP 66312A units.)

To control the relays independently of the Output On/Off switch, proceed as follows:

Action Display

1. On the Function keypad, press Output, and scroll through the Output

menu until you get to the RELAY command. The display indicates
whether the relay is presently closed (ON), or open (OFF).

2. Use the ã and ä keys to select either ON to close the relay or OFF to

open the relay. Note that the output relays always open or close

whenever the Output On/Off key is pressed.

RELAY ON

RELAY OFF

To control the polarity of the output relays, proceed as follows:

Action Display

1. On the Function keypad, press Output, and scroll through the Output

menu until you get to the REL:POL command. The display indicates the
present condition of the relay (either normal or reversed).

2. Use the ã and ä keys to select either NORM or REV. NORMal causes

the relay polarity to be the same as the dc source output REVerse causes
the relay polarity to be opposite to that of the dc source output.

REL:POL NORM

RELAY OFF

6 - Setting the HP-IB Address and RS-232 Parameters

Your dc source is shipped with the HP-IB address set to 5 This address can only be changed from
the front panel using the Address menu located under the Address key. This menu is also used to
select the RS-232 interface and specify RS-232 parameters such baud rate and parity.

Set the HP-IB address as follows:

Action Display

1. On the System keypad, press Address. ADDRESS 5

2. Enter the new address. For example, Press Enter Number, 7, Enter. ADDRESS 7

Configure the RS-232 interface as follows:

Action Display

1. On the System keypad, press Address. ADDRESS 5

2. Scroll through the Address menu by pressing q. The interface command

lets you select the RS-232 interface. The baudrate command lets you
select the baudrate. The parity command lets you select the parity. The
flow command selects the flow control options.

3. The ã and ä keys let you select the command parameters.

INTF RS232
BAUDRATE 9600
PARITY EVEN
XON-XOFF

46

Front Panel Operation - 5

7 - Saving and Recalling Operating States

NOTE: This capability is only available when the unit is set to the SCPI programming

language.

You can save up to 4 states (from location 0 to location 3) in non-volatile memory and recall them
from the front panel. All programmable settings are saved.

Save an operating state in location 1 as follows:

Action Display

1. Set the instrument to the operating state that you want to save.

2. Save this state to location 1. Press Save, Enter Number, 1, Enter. *SAV 1

Recall a saved state as follows:

Action Display

1. Recall the state saved in location 1 by pressing Recall, Enter Number,
1, Enter

*RCL 1

Select the power-on state of the dc source as follows:

Action Display

1. On the Function keypad, press Output, and scroll through the Output
menu until you get to the PON state command.

2. Use the ã and ä keys to select either RST or RCL0. RST sets the power­on state of the unit as defined by the *RST command. RCL0 sets the
power-on state of the unit to the state saved in *RCL location 0.

PON:STATE RST

Clear the non-volatile memory of the dc source as follows:

Action Display

1. On the Function keypad, press Output, Enter. This returns the unit to

the factory-default settings.

2. Save these settings to location 1. Press Save, Enter Number, 1,

Enter.

3. Repeat step #2 for memory locations 2 through 4.. *SAV 2

*RST

*SAV 1

*SAV 3
*SAV 4

47

A

Specifications

Specifications

Table A-1 lists the specifications of the dc source. Specifications are warranted over the ambient
temperature range of 0 to 55 °C. Unless otherwise noted, specifications apply when measured at
the rear terminals after a 30-minute warm-up period.

Table A-1. Performance Specifications

Parameter HP 6611C HP 6612C

HP 66312A

Output Ratings

Programming Accuracy

(@ 25°C ±5°C)

DC Measurement
Accuracy

(via HP-IB or front panel

Voltage:

Current:

Voltage: 0.05% +

+Current: 0.05% +

Voltage: 0.03% +

Low Current range

−20 mA to +20 mA: 0.1% +

0 – 8 V

0-5 A
5 mV
2 mA

2 mV

2.5 µA

0 − 20 V

0 − 2 A

10 mV

1 mA

1

2

3 mV

2.5 µA

meters with respect to
actual output @ 25°C
±5°C)

Ripple and Noise

(in the range of 20 Hz to

High Current range

+20 mA to +rated I: 0.2% +

−20 mA to − rated I: 0.2% +

Voltage (rms/p-p):

Current (rms):

3

0.5mA

1.1mA

0.5 mV/3 mV
2 mA

0.25 mA

0.85 mA

0.5 mV/3 mV
1 mA

20 MHz with outputs
ungrounded or with
either terminal grounded)

Load Regulation

5

(change in output voltage

Voltage:

Current:

2 mV
1 mA

2 mV

0.5 mA

or current for any load
change within ratings)

Line Regulation

(change in output voltage

Voltage:

Current:

0.5 mV

0.5 mA

0.5 mV

0.5 mA

or current for any line
change within ratings)

Transient Response

5

Time

(for the output voltage to recover to its previous level within 0.1% of the voltage rating of the unit or 20 millivolts
following a change in load current of up to 50% of the output current rating)

1

Applies for output voltages greater than 10mV (HP 6611C/12C), 25mV (HP 6613C), and 50mV (HP 6614C).

2

This specification may degrade slightly when the unit is subjected to an RF field ≥3 V/meter.

3

Applies in SCPI mode, with current detector set to DC. With current detector set to ACDC, accuracy is 0.2% + four times the fixed

error value. In COMPatibility mode, accuracy is 0.2% + six times the fixed error value.

4

For HP 66312A (from 1 MHz to 20 MHz ) = 0.5mV/15mV.

5

Applies at rear terminals with unit set to remote sensing and with sense terminals externally jumpered to their respective output

terminals.

HP 6613C HP 6614C

0 – 50 V

0 –1 A
20 mV

0.75 mA

1

2

3

4

< 100 µs

1

6 mV

2

2.5 uA

0.2 mA

0.8 mA

0.5 mV/4 mV
1 mA

4 mV

0.5 mA

1 mV

0.25 mA

3

0 – 100 V

0 – 0.5 A

50 mV

0.5 mA

12 mV

2.5 µA

0.1 mA

0.7 mA

0.5 mV/5 mV
1 mA

5 mV

0.5 mA

1 mV

0.25 mA

1

2

3

49

A - Specifications

Supplemental Characteristics

Table A-2 lists the supplemental characteristics, which are not warranted but are descriptions of
typical performance determined either by design or type testing.

Table A-2. Supplemental Characteristics

Parameter HP 6611C HP6612C

HP 66312A

Input Rating 100 Vac

mains:

47 – 63 Hz (87-106 Vac)
(at full load)

115 Vac mains:

(104-127 Vac)

220 Vac mains:

(191-233 Vac)

230 Vac mains:

(207-253 Vac)

Output Programming Voltage:
Range Currrent:

OVP:

Average Programming Voltage:
Resolution Current:

OVP:

OVP Accuracy 2.4 % +
Maximum Current Measurement 7 A 2.43 A 1.28 A 0.7 A

Average Current High Range:
Measurement Low Range:
Resolution
Sink Current
Programming Accuracy Voltage: 0.01% +
Temperature Coefficient Current: 0.01%

+ (change/ C
+

Readback Accuracy Voltage: 0.01% +
Temperature Coefficient

(change/C
Current (ACDC): 0.05% +
Current (Low Range): 0.01% +

Drift3 Voltage: 0.01% +

Current: 0.01% +

Output Voltage Rise/Fall Time

(for a change from 10% to 90% or
90% to 10% of the total excursion)

Output Voltage Settling Time

(to settle within 1 LSB or 0.025% times
the rated voltage of the final value)

1

HP 6611C Option 760 = 2.4% + 500mV.

2

The sink current does not track the programmed current.

3

Following a 30 minute warm-up, the change in output over 8 hours, under constant ambient, load and line operating conditions.

2

O

) OVP: 0.015%

O

) Current (DC): 0.02% +

2.2 A, 120 W

2 A, 120 W

1.1 A, 120 W

1 A, 120 W

0 – 8.190 V
0 – 5.118 A

12 V

2 mV

1.25 mA
60 mV

1

200 mV

213 uA

0.6 uA

- 3 A - 1.2 A - 0.6 A - 0.3 A

0.15 mV

30 uA

2 mV

60 uV

25 uA

160 uA

0.3 uA

0.25 mV

50 uA

1.6 A, 100 W

1.4 A, 100 W

0.8A, 100 W

0.75 A, 100 W

0 – 20.475 V
0 – 2.0475 A

0 – 22 V

5 mV

0.5 mA
100 mV
240 mV 600 mV 1.2 V

74 uA

0.6 uA

0.25 mV
12 uA

4 mV

150 uV

10 uA
80 uA

0.3 uA

0.5 mV
20 uA

HP 6613C HP 6614C

1.6 A, 100 W

1.4 A, 100 W

0.8A, 100 W

0.75 A, 100 W

0 – 51.188 V
0 – 1.0238 A

0-55 V

12.5 mV

0.25 mA
250 mV

39 uA

0.6 uA

0.5 mV

6 uA

10 mV

500 uV

5 uA

40 uA

0.3 uA
1 mV

10 uA

2 ms

6 ms

1.6 A, 100 W

1.4 A, 100 W

0.8A, 100 W

0.75 A, 100 W

0 - 102.38 V

0 – 0.5118 A

0 – 110 V

25 mV

0.125 mA
500 mV

21 uA

0.6 uA

1 mV

3 uA

20 mV

700 uV

3 uA

20 uA

0.3 uA
1 mV

10 uA

50

Table A-2. Supplemental Characteristics (continued)

Specifications - A

Parameter HP 66312A

Dynamic Measurement
Accuracy

Dynamic Measurement
System

Measurement Time

(voltage or current)

Command Processing
Time

Remote Sense Capability

Savable Instrument States

(applies only in SCPI mode)

RS-232 Interface
Capabilities

HP-IB Interface
Capabilities

Instantaneous Voltage:

Instantaneous Current:

Buffer Length:

Sampling Rate Range:

Baud rates:

Data formats:

Language:
Language:

Interface:

HP 6611C - 6614C

0.03% + 5 mV

0.6% + 1 mA
4096 points

1

not applicable

not applicable

15.6µs−31,200s
50 ms average

(includes the default time of 30 ms

2

for acquiring

data, and a 20 ms data processing overhead)

4 ms average

(for output to begin to change

following receipt of digital data)

Up to 2 V can be dropped across each load lead.

(add 2 mV to the voltage load regulation

specification for each 1 V change in the positive

output lead due to load current change.)

4 (in locations 0 to 3)

300 600 1200 2400 4800 9600

7 bits even or odd parity; 8 bits without parity

SCPI or COMPatibility

SCPI or COMPatibility

3

3

AH1, C0, DC1, DT1, E1, L4, PP0, RL1, SH1,

SR1, T6

INH/FLT Characteristics

Maximum ratings:

16.5 Vdc between terminals 1 and 2; 3 and 4; and
from terminals 1 or 2 to chassis ground

FLT Terminals:

Low-level output current = 1.25 mA max.

Low-level output voltage = 0.5 V max.

INH Terminals:

Low-level input voltage = 0.8 V max.

High-level input voltage = 2 V min.

Low-level input current = 1 mA

Pulse width = 100 µs min.
Time delay = 4 ms typical

Digital I/O Characteristics

Maximum ratings:

Digital OUT Port 0,1,2

(open collector)

same as INH/FLT Characteristics

Output leakage @ 16V = 0.1 mA (ports 0,1)

= 12.5 mA (port 2)

Output leakage @ 5V = 0.1 mA (ports 0,1)

= 0.25 mA (port 2)

Low-level output sink current @ 0.5 V = 4 mA

Low-level output sink current @ 1 V = 50 mA

1

For full scale current changes with a risetime of 20 µs, an additional 0.5% error exists in the first data point in the buffer after the

change. The error percentage increases proportionally with the decrease in risetime.

2

This time may be reduced by changing the default conditions of 2048 data points, however, measurement accuracy will be reduced.

3

COMPatibility language is used to program the HP 663xA Series power supplies.

51

A - Specifications

Table A-2. Supplemental Characteristics (continued)

Parameter HP 66312A

Digital I/O Characteristics

(continued)

Isolation to Ground

(Maximum from either
output terminal to chassis)

Recommended Calibration
Interval

Regulatory Compliance

Dimensions

(see figure 3-1)

Net weight
Shipping weight

Digital IN Port 2:

(internal pull-up)

Listing pending:

Certified to:

Conforms to:

Complies with:

Height:

Width:
Depth:

HP 6611C - 6614C

Low-level input current @ 0.4 V = 1.25 mA

High-level input current @ 5 V = 0.25 mA

Low-level input voltage = 0.8 V max.
High level input voltage = 2.0 V min.

50 Vdc 240 Vdc

1 year

(from the date the unit is put into service)

UL 3111-1

CSA 22.2 No. 1010.1

IEC 1010-1

EMC directive 89/336/EEC (ISM Group1 Class B)

88.1 mm (3.5in.)

212.8 mm (8.4in.)

444.4 mm (17.5 in.)

8.8 kg (19.5 lbs.) 8.2 kg (18.16 lbs.)

11.1 kg (24.5 lbs.) 10.6 kg (23.5 lbs.)

88.1 mm (3.5in.)

212.8 mm (8.4in.)

368.3 mm (14.5 in.)

52

B

Verification and Calibration

Introduction

This appendix includes verification and calibration procedures for the HP 66312A, 6611C, 6612C,
6613C and 6614C dc source. Instructions are given for performing the procedures either from the
front panel or from a controller over the HP-IB.

The verification procedures do not check all the operating parameters, but verify that the dc source
is performing properly. Performance Tests, which check all the specifications of the dc source, are
given in the applicable dc source Service Manual.

Important Perform the verification procedures before calibrating your dc source. If the dc

source passes the verification procedures, the unit is operating within its
calibration limits and does not need to be recalibrated.

Equipment Required

The equipment listed in the following table, or the equivalent to this equipment, is required for
verification and calibration.

Table B-1. Equipment Required

Equipment Characteristics Recommended Model

Digital Voltmeter

Current Monitor
Load Resistor

(3 W min. TC=20ppm/°C)

Power Supply
HP-IB Controller

1

The 4- terminal current shunt is used to eliminate output current measurement error caused by voltage
drops in the load leads and connections. It has special current-monitoring terminals inside the load
connection terminals. Connect the voltmeter directly to these current-monitoring terminals.

1

Resolution: 10 nV @ 1 V
Readout: 8.5 digits
Accuracy: >20 ppm

15 A (0.1 Ω), ±0.04%, TC=5ppm/°C
400 Ω (HP 6611C calibration and all

models verification.)

1.1 kΩ (HP 6612C & 66312A calibration)
2500 Ω (HP 6613C calibration)
5000 Ω (HP 6614C calibration)

8 V @ 5 A HP 6611C or HP 6631B
Full HP-IB capabilities HP Series 200/300 or equivalent

HP 3458A

Guildline 9230/15
HP p/n 0811-2878

Test Setup

Figure B-1 shows the setup for the tests. Be certain to use load leads of sufficient wire gauge to
carry the full output current (see chapter 3).

53

B - Verification and Calibration

-S-+

+S

+

-S-+

+S

-

A.

B.

C.

-S-+

+S

DC

Voltmeter

DC

Ampmeter

NOTE: Connector

is removable

-

+

NOTE: Connector

is removable

+

Current
monitor

+

­50VDC MAX TO

+

­50VDC MAX TO

­External

DC supply

resistor

400 ohm

+

Load

SENSE

Local

Remote

Set to

Remote

SENSE

Local

Remote

Set to

Remote

DC

Ampmeter

NOTE: Connector

is removable

-

Calibration Load Resistor

400 6611C

1.1K 6612C & 66312A

2.5 K 6613C
5 K 6614C

+

­50VDC MAX TO

Load

Resistor

SENSE

Local

Remote

Set to

Remote

Figure B-1. Verification & Calibration Test Setup

Performing the Verification Tests

NOTE: The verification procedure can only be performed using the SCPI language

commands. Use either the front panel Address key to access the LANG
command, or use the SYSTem:LANGuage command to change the programming
language to SCPI.

The following procedures assume you understand how to operate the dc source from the front
panel as explained in chapter 5.

When performing the verification tests from an HP-IB controller, you may have to consider the
relatively slow settling times and slew rates of the dc source as compared to computer and system
voltmeters. Suitable WAIT statements can be inserted into the test program to give the dc source
time to respond to the test commands.

Perform the following tests for operation verification in the order indicated.

1. Turn-On Checkout

2. Voltage Programming and Measurement Accuracy

3. Current Programming and Measurement Accuracy

54

Verification and Calibration - B

Table B-2. Verification Programming Values

Full scale

Voltage

6611C 8 5 5.1188 - 3 A

6612C/66312A 20 2 2.0475 - 1.2 A

6613C 50 1 1.0238 - 0.6 A
6614C 100 0.5 0.5118 - 0.3 A

Full Scale

Current

Imax Isink

Turn-On Checkout

Perform the Turn-On Checkout as directed in chapter 4.
NOTE: The dc source must pass turn-on selftest before you can proceed with the

verification tests.

Voltage Programming and Measurement Accuracy

This test verifies the voltage programming, HP-IB measurement, and front panel meter functions.
Values read back over the HP-IB should be the same as those displayed on the front panel.
Measure the dc output voltage at the output terminals. Make sure the sense switch is set to remote
and the sense terminals are directly jumpered to the output terminals.

Action Normal Result

1. Turn off the dc source and connect a DMM to the output
terminals.

2. Turn on the dc source with no load on the output. Set the output
voltage to 0 V and the output current to full scale (see table B-2).
Press Output On/Off to enable the output.

3. Record voltage readings at the DMM and on the front panel
display.

4. Set the output voltage to the full scale rated voltage
(see table B-2).

5. Record voltage readings at the DMM and on the front panel
display.

Output voltage near 0 V.
Output current near 0 A.

Readings within low voltage

limits (see table B-3, 4, 5 or 6).

Output voltage near full scale.

Readings within high voltage

limits (see table B-3, 4, 5 or 6).

Current Programming and Measurement Accuracy

This test verifies the current programming and measurement. Connect the appropriate current
monitor (see table B-1) as shown in figure B-1A.

Current Programming and Measurement (High Range)

Action Normal Result

1. Turn off the dc source and connect the DMM and current monitor
as shown in figure B-1A.

2. Turn on the dc source, access the Input menu, and set the current
sense detector to DC.

3. Set the output voltage to 5 V and the current to 0 A. Press
Output On/Off to enable the output.

CURR:DET DC

Output current near 0 A.

55

B - Verification and Calibration

4. Divide the voltage drop across the current monitor by its
resistance to convert the value to amperes. Record the value.

5. Set the output current to full scale (see table B-2)..

6. Divide the voltage drop across the current monitor by its
resistance to convert the value to amperes. Record this value and
the current reading on the front panel display.

Readings within low current

limits (see table B-3, 4, 5 or 6).

Readings within high current

limits (see table B-3, 4, 5 or 6).

Current Measurement (Low Range)

Action Normal Result

7. Turn off and connect the dc source as shown in Figure B-1B

using the 400 ohm load resistor. Set the DMM to operate in
current mode.

8. Turn on the dc source, access the Input menu, and set the

current range to LOW.

9. Set the output voltage to 0 V and the current to full scale (see

table B-2). Press Output On/Off to enable the output.

10. Record the current reading from the DMM as well as from the

front panel display. Enter the difference between the two
readings in the appropriate table.

11. Set the output voltage to 8 V. Output current near +20 mA.

CURR:RANG LOW

Output current near 0 A.

Readings within low current

measurement (see table B-3, 4,

5 or 6).

12. Record the current reading from the DMM as well as from the

front panel display. Enter the difference between the two
readings in the table.

Readings within high current

measurement (see table B-3, 4,

5 or 6).

Current Sink Measurement

Action Normal Result

13. Turn off the dc source and connect an external supply to the

output of the unit as shown in figure B-1C using the 400 ohm
load resistor. Set the DMM to operate in current mode.

14. Turn on the dc source, access the Input menu, and set the

current range to LOW.

15. Access the Input menu and set the current sense detector to DC. CURR:DET DC

Turn on the external supply and program it to 8 volts and 5 A.

16.

Program the dc source to 0 V and 1 A.
Press Output On/Off to enable the output.

17. Record the current reading from the DMM as well as from the

front panel display. Enter the difference between the two
readings in the table.

18. Access the Input menu and set the current range to HIGH. CURR:RANG HIGH

19. Short out the load resistor by connecting a jumper across it.

CURR:RANG LOW

Output current near −20 mA.

Readings within low current

sink measurement

(see table B-3, 4, 5 or 6).

Output current near −Isink (see

table B-2)

20. Record the current reading from the DMM as well as from the

front panel display. Enter the difference between the two
readings in the table.

56

Readings within high current

sink measurement

(see table B-3, 4, 5 or 6).

Verification and Calibration - B

Table B-3. Verification Test Record for HP 6611C

Model HP 6611C Report No.____________ Date_____________
Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement
High Voltage V

out

Front Panel measurement

−5 mV

V

−2 mV

out

7.991 V _______V 8.009 V

V

−4.4 mV

out

Current Programming and Measurement (High Range)

Low Current I
High Current I

out

out

Front Panel measurement

−2 mA

4.9955 A _______A 5.0045 A

I

−10.5 mA

out

Current Measurement (Low Range)

Low Current measurement
High Current measurement

I

−2.5 µA _____µA I

out

I

−22.5 µA _____µA I

out

Current Sink Measurement

Low Current Sink measurement
High Current Sink measurement

I

−22.5 µA _____µA I

sink

I

−11.1 mA

sink

Recorded Results Maximum

Specification

_______V +5 mV

_____mV V

_____mV V

+2 mV

out

+4.4 mV

out

_______A 2 mA

_____mA I

_____mA I

+10.5 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sink

+11.1 mA

sink

Table B-4. Verification Test Record for HP 66312A or HP 6612C

Model HP______________________ Report No.____________ Date_____________

Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement
High Voltage V

out

Front Panel measurement

−10 mV

V

−3 mV

out

19.980 V _______V 20.020 V

V

−9 mV

out

Current Programming and Measurement (High Range)

Low Current I
High Current I

out

out

Front Panel measurement

−1 mA

1.998 A _______A 2.002 A

I

−4.5 mA

out

Current Measurement (Low Range)

Low Current measurement
High Current measurement

I

−2.5 µA _____µA I

out

I

−22.5 µA _____µA I

out

Current Sink Measurement

Low Current Sink measurement
High Current Sink measurement

I

−22.5 µA _____µA I

sink

I

−4.85 mA

sink

Recorded Results Maximum

_______V +10 mV

_____mV V

_____mV V

_______A 1 mA

_____mA I

_____mA I

Specification

+3 mV

out

+9 mV

out

+4.5 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sink

+4.85 mA

sink

57

B - Verification and Calibration

Table B-5. Verification Test Record for HP 6613C

Model HP 6613C Report No.____________ Date_____________
Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement
High Voltage V

out

Front Panel measurement

−20 mV

V

−6 mV

out

49.955 V _______V 20.045 V

V

−21 mV

out

Current Programming and Measurement (High Range)

Low Current I
High Current I

out

out

Front Panel measurement

−0.5 mA

0.999 A _______A 1.001 A

I

−2.2 mA

out

Current Measurement (Low Range)

Low Current measurement
High Current measurement

I

−2.5 µA _____µA I

out

I

−22.5 µA _____µA I

out

Current Sink Measurement

Low Current Sink measurement
High Current Sink measurement

I

−22.5 µA _____µA I

sink

I

−2.8 mA

sink

Recorded Results Maximum

Specification

_______V +20 mV

_____mV V

_____mV V

+6 mV

out

+21 mV

out

_______A 0.5 mA

_____mA I

_____mA I

+2.2 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sink

+2.8 mA

sink

Table B-6. Verification Test Record for HP 6614C

Model HP 6614C Report No.____________ Date_____________
Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement
High Voltage V

out

Front Panel measurement

−50 mV

V

−12 mV

out

99.900 V _______V 100.100 V

V

−42 mV

out

Current Programming and Measurement (High Range)

Low Current I
High Current I

out

out

Front Panel measurement

−0.25 mA

0.4995 A _______A 0.5005 A

I

−1.1 mA

out

Current Measurement (Low Range)

Low Current measurement
High Current measurement

I

−2.5 µA _____µA I

out

I

−22.5 µA _____µA I

out

Current Sink Measurement

Low Current Sink measurement
High Current Sink measurement

I

−22.5 µA _____µA I

sink

I

−1.7 mA

sink

Recorded Results Maximum

Specification

_______V +50 mV

_____mV V

_____mV V

+12 mV

out

+42 mV

out

_______A 0.25 mA

_____mA I

_____mA I

+1.1 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sink

+1.7 mA

sink

58

Verification and Calibration - B

Performing the Calibration Procedure

NOTE: The calibration procedure can only be performed using the SCPI language

commands. Use either the front panel Address key to access the LANG
command, or use the SYSTem:LANGuage command to change the programming
language to SCPI.

Table B-1 lists the equipment required for calibration. Figure B-1 shows the test setup.
You do not have to do a complete calibration each time. If appropriate, you may calibrate only the

voltage or current and proceed to "Saving the Calibration Constants". However, the voltage or
current calibration sequence must be performed in its entirety. The following parameters may be
calibrated:

♦ voltage programming and measurement
♦ overvoltage protection (OVP)
♦ current programming and measurement
♦ low range measurement
♦ ac current measurement

Front Panel Calibration Menu

The Entry keypad is used for calibration functions.

CalShift

Press this key to access the calibration menu.

Display Command Function

CAL ON <value> Turns calibration mode on when the correct password

value is entered.

CAL OFF Turns calibration mode off
CAL:LEV <char> Advance to next step in sequence (P1 or P2).
CAL:DATA <value> Enter an external calibration measurement.

CAL:VOLT Begin voltage calibration sequence
CAL:VOLT:PROT Begin voltage protection calibration
CAL:CURR Begin high range current calibration sequence
CAL:CURR:MEAS:LOW Begin low range current measurement calibration
CAL:CURR:MEAS:AC Begin ac current calibration sequence
CAL:SAVE Saves the calibration constants in non-volatile memory.
CAL:PASS <value> Set new calibration password.

Notes:

value = a numeric value
char = a character string parameter
Use and to scroll through the menu commands.

ã ä

Use and to scroll through the menu parameters.

á â

Use and to select a digit in a numeric entry field.

qp

59

B - Verification and Calibration

Front Panel Calibration

These procedures assume you understand how to operate front panel keys (see chapter 5).

Enable Calibration Mode

Action Display

1. Reset the unit by selecting Output, scrolling to *RST and pressing
Enter.

2. Press Output On/Off to enable the output. 00.003V 0.0006A

3. To begin calibration press Shift Cal, scroll to CAL ON and press
Enter.

4. Enter the calibration password from Entry keypad and press Enter. lf
the password is correct the Cal annunciator will come on.
If CAL DENIED appears, then an internal switch has been set to
prevent the calibration from being changed. (See the Service Manual.)
lf the password is incorrect, an error occurs. If the active password is
lost, the calibration function can be recovered by setting an internal
switch that defeats password protection. (See the Service Manual.)

*RST

CAL ON 0.0

CAL DENIED

OUT OF RANGE

Voltage Programming and Measurement Calibration

Action Display

5. Connect the DMM (dc volts mode) directly to the dc source. Do not

connect the load resistor or current shunt.

6. Press Shift Cal, scroll to CAL VOLT, and press Enter. CAL:VOLT

7. Press Shift Cal, scroll to CAL LEV, and press Enter to select the

first calibration point.

CAL:LEV P1

8. Press Shift Cal, scroll to CAL DATA, press Enter Number, and

enter the voltage value displayed on the DMM.

9. Press Shift Cal, scroll to CAL LEV, use ä to scroll to P2 (the

second calibration point), and press Enter.

10. Press Shift Cal, scroll to CAL DATA, press Enter Number, and

enter the second voltage value displayed on the DMM.

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

Overvoltage Protection Calibration

Action Display

11. Press Shift Cal, scroll to CAL VOLT PROT, and press Enter. CAL:VOLT:PROT

12. Wait for the dc source to compute the OVP calibration constant.

The display returns to Meter mode when the calculation is
complete.

60

Verification and Calibration - B

Current Programming and High-Range Measurement Calibration

Action Display

13. Connect the appropriate current monitor as shown in figure B-1A.

Connect the DMM (in dc mode) across the current shunt.

14.

Press Shift Cal, scroll to CAL CURR, and press Enter.

15.

Press Shift Cal, scroll to CAL LEV, and press Enter to select the
first calibration point.

16.

Press Shift Cal and scroll to CAL DATA. Wait for the DMM reading
to stabilize. Then read the DMM and compute the first current value
(DMM reading ÷ shunt resistance). Press Enter Number and enter
the first current value.

17.

Press Shift Cal, scroll to CAL LEV, use Ì to scroll to P2 (the
second calibration point), and press Enter.

18.

Press Shift Cal and scroll to CAL DATA. Wait for the DMM reading
to stabilize. Then read the DMM and compute the second current
value (DMM reading ÷ shunt resistance). Press Enter Number and
enter the second current value.

Low-Range Current Measurement Calibration

Action Display

19.

Press Shift Cal, scroll to CAL CURR MEAS LOW, and press
Enter.

20. Connect the appropriate calibration load resistor as shown in

figure B-1B. Connect the DMM (in current mode) in series with
the load.

CAL:CURR:MEAS:LOW

CAL:CURR

CAL:LEV P1

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

21.

Press Shift Cal, scroll to CAL LEV, and press Enter to select the
first calibration point.

22.

Press Shift Cal and scroll to CAL DATA. Wait for the DMM
reading to stabilize. Then press Enter Number and enter the
current reading displayed on the DMM.

AC Current Measurement Calibration (HP 66312A only)

Action Display

23. Disconnect all loads from the dc source.

24.

Press Shift Cal, scroll to CAL CURR MEAS AC, and press
Enter.

25. Wait for the dc source to compute the ac current calibration

constant. The display returns to Meter mode when the calculation
is complete.

CAL:CURR:MEAS AC

CAL:LEV P1

CAL:DATA 0.00

61

B - Verification and Calibration

Saving the Calibration Constants

WARNING: Storing calibration constants overwrites the existing ones in non-volatile memory.

If you are not sure you want to permanently store the new constants, omit this
step. The dc source calibration will then remain unchanged.

Action Display

26. Press Shift Cal, scroll to CAL SAVE, and press Enter. CAL:SAVE

27. Press Shift Cal, select CAL OFF, and press Enter to exit Calibration

mode. *RST and *RCL will also set the calibration state to OFF.

Calibration Error Messages

Errors that can occur during calibration are shown in the following table.

Table B-6. HP-IB Calibration Error Messages

Error Meaning

401 CAL switch prevents calibration (This is a hardware disable, see the Service Manual.)
402 CAL password is incorrect
403 CAL not enabled
404 Computed readback cal constants are incorrect
405 Computed programming cal constants are incorrect
406 Incorrect sequence of calibration commands

Changing the Calibration Password

CAL OFF

The factory default password is 0. You can change the password when the dc source is in
calibration mode (which requires you to enter the existing password). Proceed as follows:

Action Display

1. Begin by pressing Shift Cal and scrolling to the CAL ON command. CAL ON 0.0

2. Enter the existing password from Entry keypad and press Enter

3. Press Shift Cal and scroll to the CAL PASS command. CAL:PASS 0

4. Enter the new password from the keypad. You can use any number with up

to six digits and an optional decimal point. If you want the calibration
function to operate without requiring any password, change the password to
0 (zero).

NOTE: If you want the calibration function to operate without requiring any password,

change the password to 0 (zero).

62

Verification and Calibration - B

Calibration Over the HP-IB

You can calibrate the dc source by using SCPI commands within your controller programming
statements. Be sure you are familiar with calibration from the front panel before you calibrate from
a controller. Each front panel calibration command has a corresponding SCPI command. When
you write your calibration program, perform the calibration procedure in the same order as the
front panel procedure documented in this appendix.

The SCPI calibration commands are explained in chapter 3 of the dc source Programming Guide.
Calibration error messages that can occur during HP-IB calibration are shown in table B-3.

63

C

Error Messages

Error Number List

This appendix gives the error numbers and descriptions that are returned by the dc source. Error
numbers are returned in two ways:

♦ Error numbers are displayed on the front panel
♦ Error numbers and messages are read back with the SYSTem:ERRor? query.

SYSTem:ERRor? returns the error number into a variable and returns two parameters: an
NR1 and a string.

The following table lists the errors that are associated with SCPI syntax errors and interface
problems. It also lists the device dependent errors. Information inside the brackets is not part of the
standard error message, but is included for clarification.

When errors occur, the Standard Event Status register records them in bit 2, 3, 4, or 5 as described
in the following table:

Table C-1. Error Numbers

Error
Number

–100 Command error [generic]
–101 Invalid character
–102 Syntax error [unrecognized command or data type]
–103 Invalid separator
–104 Data type error [e.g., "numeric or string expected, got block data"]
–105 GET not allowed
–108 Parameter not allowed [too many parameters]
–109 Missing parameter [too few parameters]
–112 Program mnemonic too long [maximum 12 characters]
–113 Undefined header [operation not allowed for this device]
–121 Invalid character in number [includes "9" in octal data, etc.]
–123 Numeric overflow [exponent too large; exponent magnitude >32 k]
–124 Too many digits [number too long; more than 255 digits received]
–128 Numeric data not allowed

Error String [Description/Explanation/Examples]

Command Errors –100 through –199 (sets Standard Event Status Register bit #5)

65

C - Error Messages

–131 Invalid suffix [unrecognized units, or units not appropriate]
–138 Suffix not allowed
–141 Invalid character data [bad character, or unrecognized]
–144 Character data too long
–148 Character data not allowed
–150 String data error
–151 Invalid string data [e.g., END received before close quote]
–158 String data not allowed
–160 Block data error
–161 Invalid block data [e.g., END received before length satisfied]
–168 Block data not allowed
–170 Expression error
–171 Invalid expression
–178 Expression data not allowed

Execution Errors –200 through –299 (sets Standard Event Status Register bit #4)

–200 Execution error [generic]
–222 Data out of range [e.g., too large for this device]
–223 Too much data [out of memory; block, string, or expression too long]
–224 Illegal parameter value [device-specific]
–225 Out of memory
–270 Macro error
–272 Macro execution error
–273 Illegal macro label
–276 Macro recursion error
–277 Macro redefinition not allowed

System Errors –300 through –399 (sets Standard Event Status Register bit #3)

–310 System error [generic]
–350 Too many errors [errors beyond 9 lost due to queue overflow]

Query Errors –400 through –499 (sets Standard Event Status Register bit #2)

–400 Query error [generic]
–410 Query INTERRUPTED [query followed by DAB or GET before response complete]
–420 Query UNTERMINATED [addressed to talk, incomplete programming message received]
–430 Query DEADLOCKED [too many queries in command string]
–440 Query UNTERMINATED [after indefinite response]

66

Selftest Errors 0 through 99 (sets Standard Event Status Register bit #3)

0 No error
1 Non-volatile RAM RD0 section checksum failed
2 Non-volatile RAM CONFIG section checksum failed
3 Non-volatile RAM CAL section checksum failed
4 Non-volatile RAM STATE section checksum failed
5 Non-volatile RST section checksum failed
10 RAM selftest
11 VDAC/IDAC selftest 1
12 VDAC/IDAC selftest 2
13 VDAC/IDAC selftest 3
14 VDAC/IDAC selftest 4
15 OVDAC selftest
80 Digital I/O selftest error

Device-Dependent Errors 100 through 32767 (sets Standard Event Status Register bit
#3)

Error Messages - C

213 Ingrd receiver buffer overrun
216 RS-232 receiver framing error
217 RS-232 receiver parity error
218 RS-232 receiver overrun error
220 Front panel uart overrun
221 Front panel uart framing
222 Front panel uart parity
223 Front panel buffer overrun
224 Front panel timeout
401 CAL switch prevents calibration
402 CAL password is incorrect
403 CAL not enabled
404 Computed readback cal constants are incorrect
405 Computed programming cal constants are incorrect
406 Incorrect sequence of calibration commands
407 CV or CC status is incorrect for this command
408 Output mode switch must be in NORMAL position
601 Too many sweep points
602 Command only applies to RS-232 interface
603 CURRent or VOLTage fetch incompatible with last acquisition
604 Measurement overrange

67

D

white/red/grey

Line Voltage Conversion

WARNING: Shock Hazard Operating personnel must not remove instrument covers.

Component replacement and internal adjustments must be made only by
qualified service personnel.

Open the Unit

♦ Turn off ac power and disconnect the power cord from the unit.
♦ Loosen the two screws on the rear bezel and remove the bezel (use a #15 Torx drive).
♦ Remove the two screws on the bottom of the unit (use a #15 Torx drive).
♦ Pull the cover back to remove it from the unit.

Configure the Power Transformer

♦ Locate the ac input wiring harness on the left side of the transformer
♦ Use a needlenose pliers and connect the ac input wiring harness according to the information in

the following figure:

white/red/grey

grey

grey

grey

orange

orange

white/yellow

white/violet

orange

white/red/grey

grey

orange

orange

white/yellow
white/violet

orange

white/red/grey

Figure D-1, Power Transformer AC Input Connections

orange

(spare)

white/yellow
white/violet

orange

(spare)

white/yellow

white/violet

69

D - Line Voltage Conversion

Install the Correct Line Fuse

♦ Unscrew the line fuse cap from the rear panel and install the correct fuse.

For 100/120 Vac operation: 2 A slow-blow; HP part number 2110-0303
For 220/230 Vac operation: 1 A slow-blow; HP part number 2110-0007

♦ Mark the voltage setting that the unit has been set to on the rear panel label.

Close the Unit

♦ Replace the outer cover.
♦ Reconnect the power cord and turn on the unit.

70

Index

— —

-- -- -- -- -- --, 43

—+—

+/- terminals, 23
+S/-S terminals, 23

—0—

0 ... 9, 41

—A—

ac line conversion, 69
accessories, 18
ACDC current detector, 44
airflow, 22
annunciators

Addr, 36
Cal, 36
CC, 36
CV, 36
Dis, 36
Err, 36
OCP, 36
Prot, 36
Rmt, 36
Shift, 36
SRQ, 36
Unr, 36

AWG ratings, 23

—C—

cables, 18
calibration, 59

current programming - high range, 61
current programming - low range, 61
enable, 60
equipment, 53
error messages, 62
menu, 59
OVP, 60
password, 62
peak current, 61
saving, 62
setup, 53
voltage measurement, 60

voltage programming, 60
capacitor discharge limit, 26
CC mode, 20, 42
checkout procedure, 32

cleaning, 21
clear protection, 43
controller connections, 28
controls and indicators, 19
conversion, ac line, 69
crowbar circuit, 26
current measurement range, 43
CV mode, 20, 42

—D—

damage, 21
DC current detector, 44
DFI signal, 26
DIGIO, 45
digital connector, 21, 26
digital I/O, 28
digital output port, 45
dimensions, 22
disabling multiple units, 27

—E—

enable output, 42
enter value, 42
entry keys, 41

á, 41

0 ... 9, 41
Backspace, 41
Clear Entry, 41

Enter Number, 41
error messages, 34
error numbers, 65

—F—

features, 19
FLT, 45
FLT output, 26
front panel, 19, 35

annuncuiators, 36

connections, 23

controls and indicators, 35

keys, 36
FS, 38, 43
FS status, 26
function keys, 38

p, 38

Cal, 40

Current, 40

immediate action, 38

Input, 39

Meter, 39

OCP, 38

Output, 40

71

Index

Output On/Off, 38
OV, 40
Prot Clear, 38
Protect, 40
Voltage, 40

fuses, 23

—G—

ground, earth, 18
guide, programming, 17
guide, user’s, 17

—H—

history, 6
HP-IB, 46

address, 46
connections, 28
interface, 28

—I—

INH, 45
INH input, 26
input

connections, 23
power, 18

inspection, 21

—L—

line fuse

replacing, 34
line voltage conversion, 69
load line, 20
load voltage drops, 24
location, 22

—M—

making measurements, 43
manuals, 21
measurement ranges, 43
multiple loads, 24

—N—

non-volatile memory

clearing, 47

storing, 37, 40

—O—

OC, 43
operating features, 19
option 760, 46
options, 18
OT, 43

output

characteristic, 20
connections, 23
connector, 21
control keys, 40
current setting, 42
enable, 42
rating, 20

voltage setting, 42
output relay, 46
OV, 43
OVLD, 34, 43
OVP

capacitor discharge limit, 26

circuit, 26

—P—

power cord, 21, 23
power receptacle, 18
preliminary checkout, 31
print date, 6
protection

FS, 43

OC, 43

OT, 43

OV, 43

RI, 43

—Q—

query protection, 43

—R—

rack mount kit, 18
rack mounting, 22
rear panel

connections, 26, 28, 29
recalling operating states, 47
remote programming, 19
remote sensing, 25

stability, 26
repacking, 21
RI, 43

signal, 26
RIDFI, 45
RS-232, 46

connections, 29

interface, 29

—S—

safety class, 18
safety warning, 18
saving operating states, 47
selftest errors, 34
sense connections, 25
service guide, 18

72

Index

setting voltage/current, 42
shift annunciator, 31
shift key, 31
shorting switch, 27
specifications, 49
stability with remote sensing, 26
supplemental characteristics, 50
system errors, 65
system keys, 37

Address, 37
Error, 37
Interface, 37
Local, 37
RCL, 37
Save, 37
Shift, 37

—T—

turn-on checkout, 31, 55

—V—

verification

current measurement accuracy, 55

current programming, 55

equipment, 53

setup, 53

test record, 57

voltage measurement accuracy, 55

voltage programming, 55
verification tests, 31

—W—

warranty, 2
wire

current ratings, 23
wiring considerations, 23

73

HP Sales and Support Offices

For more information, call your local HP sales office listed in your telephone directory or an HP
regional office listed below for location of your nearest sales/support office.

United States of America: Europe:

Hewlett-Packard Company Hewlett-Packard
Test and Measurement Organization European Marketing Center
5301 Stevens Creek Blvd P.O. Box 999
Bldg 51L-5C 1180 AZ Amstelveen
Santa Clara, CA 95052-8059 The Netherlands
[phone]

Japan:

Asia Pacific: Yokogawa Hewlett-Packard Ltd.

Hewlett-Packard Asia Pacific Ltd. Measurement Assistance Center
17-21/F Shell Tower, Time Square 9-1, Takakura-Cho, Hachioji-Shi,
1 Matheson Street, Causeway Bay, Tokyo, 192, Japan
Hong Kong (81) 426 48 3860
(852) 2599 7070

Latin America:

Australia/New Zealand: Hewlett-Packard

Hewlett-Packard Australia Ltd. Latin American Region Headquarters
31-41 Joseph Street 5200 Blue Lagoon Drive
Blackburn, Victoria 3130 9th Floor
Australia Miami, Florida 33126
131 347 ext. 2902 U.S.A.

[phone]/4220

Canada:

Hewlett-Packard Canada Ltd.
5150 Spectrum Way
Mississauga, Ontario L4W 5Gl
[phone]

74

Manual Updates

The following updates have been made to this manual since the November 1997 printing
indicated on the Printing History page.

7/8/99

The Isink rating referred to on page 20 has been corrected. Additional information about CV mode
operation has also been added to this page.

Notes have been added to Table A-1 for the Ripple and Noise specifications as well as the DC
Measurement Accuracy Voltage specification.

A note has been added to table A-2 for the OVP Accuracy characteristic, and the Isolation to Ground
characteristic has been corrected.

Steps 19 and 20 on page 61 under Low Range Current Measurement Calibration have been switched.