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Service Guide

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The Agilent Technologies E3631A is a high performance 80 watt-triple output DC power supply with GPIB and RS-232 interfaces. The combination of benchtop and system features in this power supply provides versatile solutions for your design and test requirements.

Convenient bench-top features

• Triple output

• Easy-to-use knob control for voltage and current settings

• Highly visible vacuum-fluorescent display for voltage and current meters

• Tracking operation for ±25V outputs

• Excellent load and line regulation and low ripple and noise

• Operating states storage

• Portable, ruggedized case with non-skid feet

Flexible system features

• GPIB (IEEE-488) and RS-232 interfaces are standard

• SCPI (Standard Commands for Programmable Instruments) compatibility

• I/O setup easily done from front-panel

Agilent E3631A Triple Output DC Power Supply

The Front Panel at a Glance

1 Meter and adjust selection keys 2 Tracking enable/disable key 3 Display limit key 4 Recall operating state key 5 Store operating state/Local key 6 Error/Calibrate key

7 I/O Configuration / Secure key 8 Output On/Off key 9 Control knob 10 Resolution selection keys 11 Voltage/current adjust selection key

1 Meter and adjust selection keys Select the output voltage and current of any one

supply (+6V, +25V, or -25V output) to be monitored on the display and allow knob adjustment of that supply.

2 Tracking enable / disable key Enables / disables the track mode of

±25V supplies.

3 Display limit key Shows the voltage and current limit values on the display and allows

knob adjustment for setting limit values.

4 Recall operating state key Re calls a prev iously stor ed ope r atin g stat e from locati on

"1", "2", or "3".

5 Store operating state / Local key

Stores an operating state in location "1", "2", or

"3" / or returns the power supply to local mode from remote interface mode.

6 Error / Calibrate key

Displays error codes generated during operations, self-test and calibration / or enables calibration mode (the power supply must be unsecured before performing calibration).

7 I/O Configuration / Secure key

Configures the power supply for remote interfaces

/ or secure and unsecure the power supply for calibration.

8 Output On/Off key Enables or disables all three power supply outputs. This key

toggles between two states.

9 Control knob Increases or decreases the value of the blinking digit by turning

clockwise or counter clockwise.

10 Resolution selection keys Move the flashing digit to the right or left.

11 Voltage/current adjust selection key Selects the knob function to voltage control

or current control.

The key can be used as the "Local" key when the power supply is in the remote

interface mode.

You can enable the "calibration mode" by holding down this key when you turn on

the power supply.

You can use it as the "Secure" or "Unsecure" key when the power supply is in the

calibration mode.

Front-Panel Voltage and Current Settings

You can set the voltage and current from the front panel using the following method.

Use the voltage/current adjust selection key, the resolution selection keys, and the control knob to change the limiting or limitings value of voltage or current.

1 Press the key after turning on the power supply.

2 Set the knob to the voltage control mode or current control mode using the voltage/

current adjust selection key.

3 Move the blinking digit to the appropriate position using the resolution selection keys.

4 Change the blinking digit to the desired value using the control knob.

5 Press the key to enable the output. After about 5 seconds, the

display will go to the output monitor mode automatically to display the voltage and current at the output.

Display Limit

Output On/Off

Note All front panel keys and controls can be disabled with remote interface commands.

The Agilent E3631A must be in "Local" mode for the front panel keys and controls to function.

Display Annunciators

Adrs Power supply is addressed to listen or talk over a remote interface. Rmt Power supply is in remote interface mode. +6V Displays the output voltage and current for +6V supply. Knob is active for

+6V supply.

+25V Displays the output voltage and current for +25V supply. Knob is active for

-25V Displays the output voltage and current for -25V supply. Knob is active for

CAL power supply is in calibration mode. Track The outputs of +25V and -25V supplies are in track mode. Limit The display shows the voltage and current limit value of a selected supply. ERROR Hardware or remote interface command errors are detected and also the

OFF The three ouputs of the power supply are disabled. Unreg The displayed output is unregulated (output is neither CV nor CC). CV The displayed output is in constant-voltage mode. CC The displayed output is in constant-current mode.

+25V supply.

-25V supply.

error bit has not been.

To review the display annunciators, hold down key as you

Display Limit

turn on the power supply.

The Rear Panel at a Glance

1 Power-line voltage setting 2 Power-line fuse-holder assembly 3 AC inlet

Use the front-panel key to:

• Select the GPIB or RS-232 interface (see chapter 3).

• Set the GPIB bus address (see chapter 3).

• Set the RS-232 baud rate and parity (see chapter 3).

I/O Config

4 Power-line module 5 GPIB (IEEE-488) interface connector 6 RS-232 interface connector

In This Book

Specifications Chapter 1 lists the power supply’s specifications and describes how to interpret these specifications.

Quick Start

familiar with the front-panel features.

Calibration Procedures Chapter 3 provides performance verification and calibration procedures.

Theory of Operation Chapter 4 describes block and circuit level theory related to the operation of the power supply.

Service Chapter 5 provides guidelines for returning your power supply to Agilent Technologies for servicing, or for servicing it yourself.

Replaceable Parts Chapter 6 contains a detailed parts list of the power supply.

Backdating Chapter 7 describes the difference between this manual and older issues of this manual.

Chapter 2 prepares the power supply for use and helps you get

Schematics Chapter 8 contains the power supply's schematics, disassembly drawings, and component locator drawings.

If you have questions relating to the operation of the power supply, call 1-800-452-4844 in the United States, or contact your nearest Agilent Technologies Sales Office.

Chapter 1 Specifications

Performance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15 Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Chapter 2 Quick Start

To prepare the power supply for use - - - - - - - - - - - - - - - - - - - - - - 23 To check the rated voltages of the power supply - - - - - - - - - - - - 25 To check the rated currents of the power supply - - - - - - - - - - - - 27 To use the power supply in constant voltage mode - - - - - - - - - - 29 To use the power supply in constant current mode - - - - - - - - - - 31 To use the power supply in track mode- - - - - - - - - - - - - - - - - - - - 33 To store and recall the instrument state - - - - - - - - - - - - - - - - - - - 34 To rack mount the power supply - - - - - - - - - - - - - - - - - - - - - - - - - 36

Chapter 3 Calibration Procedures

Agilent Technologies Calibration Services - - - - - - - - - - - - - - - - - 41 Calibration Interval- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 41 Automating Calibration Procedures - - - - - - - - - - - - - - - - - - - - - - 42 Recommended Test Equipment - - - - - - - - - - - - - - - - - - - - - - - - - - 42 Test Considerations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43 Performance Verification Tests - - - - - - - - - - - - - - - - - - - - - - - - - - 44

Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 Performance Verification Tests- - - - - - - - - - - - - - - - - - - - - - - - - 44

Measurement Techniques- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45

Setup for Most Tests - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 Electronic Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 Current-Monitoring Resistor - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 Programming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 Voltage and Current Values - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46

Constant Voltage (CV) Verifications - - - - - - - - - - - - - - - - - - - - - - 47

Constant Voltage Test Setup - - - - - - - - - - - - - - - - - - - - - - - - - - - 47 Voltage Programming and Readback Accuracy - - - - - - - - - - - - 47 CV Load Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49 CV Line Regulation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50 Normal Mode Voltage Noise (CV Ripple and Noise) - - - - - - - - 51 Common Mode Current Noise- - - - - - - - - - - - - - - - - - - - - - - - - - 52 Load Transient Response Time - - - - - - - - - - - - - - - - - - - - - - - - - 53

Contents

Chapter 3 Calibration Procedures (continued)

Constant Current (CC) Verifications - - - - - - - - - - - - - - - - - - - - - - 54

Constant Current Test Setup - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 Current Programming and Readback Accuracy - - - - - - - - - - - - 54 CC Load Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56 CC Line Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 Normal Mode Current Noise (CC Ripple and Noise) - - - - - - - - 58

Performance Test Record for Agilent E3631A - - - - - - - - - - - - - - - 59

CV Performance Test Record- - - - - - - - - - - - - - - - - - - - - - - - - - - 59 CC Performance Test Record- - - - - - - - - - - - - - - - - - - - - - - - - - - 60

Calibration Security Code - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61

To Unsecure the Power Supply for Calibration - - - - - - - - - - - - 62

To Unsecure the Power Supply Without the Security Code - - - 64 Calibration Count - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65 Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65 General Calibration/Adjustment Procedure - - - - - - - - - - - - - - - - - 66 Aborting a Calibration in Progress - - - - - - - - - - - - - - - - - - - - - - - - 71 Calibration Record for Agilent E3631A - - - - - - - - - - - - - - - - - - - - 72 Error Messages - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73 Calibration Program - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 75

Chapter 4 Theory of Operation

Block Diagram Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 81 AC Input and Bias Supplies - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 83 Floating Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 84 D-to-A Converter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 86 A-to-D Converter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87 Power Mesh and Control- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88 Earth-Referenced Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90 Front Panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90

Chapter 5 Service

Operating Checklist - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 93

Is the Power Supply Inoperative? - - - - - - - - - - - - - - - - - - - - - - - 93

Does the Power Supply Fail Self-Test? - - - - - - - - - - - - - - - - - - - 93 Types of Service Available - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94

Standard Repair Service (worldwide) - - - - - - - - - - - - - - - - - - - - 94

Express Exchange (U.S.A. only) - - - - - - - - - - - - - - - - - - - - - - - - 94

Contents

Chapter 5 Service (continued)

Repacking for Shipment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 95 Electrostatic Discharge (ESD) Precautions - - - - - - - - - - - - - - - - 96 Surface Mount Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96 To Replace the Power-Line Fuse - - - - - - - - - - - - - - - - - - - - - - - - - 96 Troubleshooting Hints - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97

Unit is Inoperative - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97 Unit Reports Errors 740 to 748 - - - - - - - - - - - - - - - - - - - - - - - - - 97 Unit Fails Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97 Bias Supplies Problems - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98

Self-Test Procedures- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99

Power-On Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99 Complete Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99

Chapter 6 Replaceable Parts

Replaceable Parts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104

To Order Replaceable Parts- - - - - - - - - - - - - - - - - - - - - - - - - - - 104 Backdating and Parts Changes - - - - - - - - - - - - - - - - - - - - - - - - 104 E3631-60002 Top PCB Assembly - - - - - - - - - - - - - - - - - - - - - - - 105 E3631-60003 VFD Assembly- - - - - - - - - - - - - - - - - - - - - - - - - - - 111 E3631-60002 Bottom PCB Assembly - - - - - - - - - - - - - - - - - - - - 112 E3631-60002 Front Frame Assembly - - - - - - - - - - - - - - - - - - - - 116 E3631A Power Supply Assembly - - - - - - - - - - - - - - - - - - - - - - - 116 Manufacturer’s List - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 117

Chapter 7 Backdating - - - - - - - - - - - - - - - - - - - - - - - - - 119

Chapter 8 Schematics

Mechanical Disassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 123 E3631-60002 Component Locator - - - - - - - - - - - - - - - - - - - - - - - 124 E3631-60003 Component Locator - - - - - - - - - - - - - - - - - - - - - - - 125 E3631-60004 Component Locator - - - - - - - - - - - - - - - - - - - - - - - 126 AC Input and Bias Supplies Schematic - - - - - - - - - - - - - - - - - - - 127 Floating Logic Schematic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 128 ADC and DAC Schematic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 129 25V Power Circuit Schematic- - - - - - - - - - - - - - - - - - - - - - - - - - - 130 +6V Power Circuit and Isolation Schematic - - - - - - - - - - - - - - - 131 Earth-Referenced Logic Schematic - - - - - - - - - - - - - - - - - - - - - - 132 Display and Keyboard Schematic - - - - - - - - - - - - - - - - - - - - - - - 133

Contents

Specifications

The

performance

are warranted in the temperature range of 0 to 40°C with a resistive load.

Supplemental

performance determined either by design or testing. Chapter 3 "Calibration Procedures" contains procedures for verifying the performance specifications. All specifications apply to the three outputs unless otherwise specified.

specifications are listed in the following pages. Specifications

characteristics, which are not warranted but are descriptions of

Chapter 1 Specifications

Performance Specifications

Output Ratings (@ 0°C - 40°C) +6V Output 0 to +6 V ; 0 to 5 A

+25V Output 0 to +25 V ; 0 to 1 A

-25V Output 0 to -25 V ; 0 to 1 A

[1]

Programming Accuracy

+6V Output

Voltage 0.1% + 5 mV 0.05% + 20 mV 0.05% + 20 mV Current 0.2% + 10 mA 0.15% + 4 mA 0.15% + 4 mA

12 months (@ 25°C ± 5°C), ±(% of output + offset)

+25V Output -25V Output

Readback Accuracy

to actual output @ 25°C ± 5°C), ±(% of output + offset)

Voltage 0.1% + 5 mV 0.05% + 10 mV 0.05% + 10 mV Current 0.2% + 10 mA 0.15% + 4 mA 0.15% + 4 mA

Ripple and Noise (with outputs ungrounded, or with either output terminal grounded, 20 Hz to 20 MHz)

Voltage <0.35 mV rms <0.35 mV rms <0.35 mV rms

Current <2 mA rms <500 mA rms <500 mA rms Common mode current <1.5 mA rms

Load Regulation, Change in output voltage or current for any load change within ratings Voltage <0.01% + 2 mV

Current <0.01% + 250 mA

Line Regulation, Change in output voltage and current for any line change within ratings Voltage <0.01% + 2 mV

Current <0.01% + 250 mA

[1]

12 months (over GPIB and RS-232 or front panel with respect

+6V Output

<2 mV p-p <2 mV p-p <2 mV p-p

+25V Output -25V Output

±(% of output + offset)

[1]

Accuracy specifications are after an 1-hour warm-up and calibration at 25°C

Chapter 1 Specifications

Performance Specifications

Programming Resolution

+6V Output

Voltage 0.5 mV 1.5 mV 1.5 mV Current 0.5 mA 0.1 mA 0.1 mA

Readback Resolution

+6V Output

Voltage 0.5 mV 1.5 mV 1.5 mV Current 0.5 mA 0.1 mA 0.1 mA

Meter Resolution

+6V Output

Voltage 1 mV 10 mV 10 mV Current 1 mA 1 mA 1 mA

Transient Response Time

Less than 50 msec for output recover to within 15 mV following a change in output current from full load to half load or vice versa

+25V Output -25V Output

Command Processing Time

Programming Commands : Maximum time for output to change after receipt of APPLy and SOURce commands : <50 msec

Readback Command : Maximum time to readback output by MEASure? command : <100 msec

The Other Commands : < 50 msec

Tracking Accuracy

±25V outputs track each other within ± (0.2% of output + 20 mV).

The

Chapter 1

Specifications

Supplemental Characteristics

Output Programming Range (maximum programmable values)

+6V Output +25V Output -25V Output

Voltage 0 to 6.18 V 0 to 25.75 V 0 to -25.75 V Current 0 to 5.15 A 0 to 1.03 A 0 to 1.03 A

Temperature Coefficient, ±(% of output + offset) Maximum change in output/readback per °C after a 30-minute warm-up

+6V Output +25V Output -25V Output

Voltage 0.01% + 2 mV 0.01% + 3 mV 0.01% + 3 mV Current 0.02% + 3 mA 0.02% + 0.5 mA 0.02% + 0.5 mA

Stability, ±(% of output + offset) Following a 30-minute warm-up, change in output over 8 hours under constant load,

line, and ambient temperature

+6V Output +25V Output -25V Output

Voltage 0.03% + 1 mV 0.02% + 2 mV 0.02% + 2 mV Current 0.1% + 3 mA 0.05% + 1 mA 0.05% + 1 mA

Voltage Programming Speed

Maximum time required for output voltage to settle within 1% of its total excursion (for resistive load). Excludes command processing time.

+6V Output +25V Output -25V Output

Full load Up 11 msec 50 msec 50 msec Full load Down 13 msec 45 msec 45 msec

No load Up 10 msec 20 msec 20 msec No load Down 200 msec 400 msec 400 msec

Isolation

The 0-6V supply is isolated from the ±25V supply up to ±240 Vdc. Maximum isolation voltage from any terminal to chassis ground ±240 Vdc.

AC Input Ratings (selectable via rear panel selector) std 115 Vac ± 10%, 47 to 63 Hz

opt 0E3 230 Vac ± 10%, 47 to 63 Hz opt 0E9 100 Vac ± 10%, 47 to 63 Hz

Maximum Input Power

350 VA with full load

Chapter 1 Specifications

Supplemental Characteristics

Cooling

Fan cooled

Operating Temperature

0 to 40°C for full rated output. At higher temperatures, the output current is derated linearly to 50% at 55°C maximum temperature.

Output Voltage Overshoot

During turn-on or turn-off of ac power, output plus overshoot will not exceed 1 V if the output control is set to less than 1 V. If the output control is set to 1 V or higher, there is no overshoot.

Programming Language

SCPI (Standard Commands for Programmable Instruments)

State Storage Memory

Three (3) user-configurable stored states

Recommended Calibration Interval

1 year

Dimensions

212.6 mmW x 132.6 mmH x 348.2 mmD (8.4 x 5.2 x 13.7 in)

*See the next page for detailed information.

Weight

Net 8.2 kg (18 lb) Shipping 11 kg (24 lb)

Chapter 1 Specifications

Supplemental Characteristics

Figure 1-1. Dimensions of Agilent E3631A Power Supply

Chapter 1 Specifications

Supplemental Characteristics

Quick Start

One of the first things you will want to do with your power supply is to become acquainted with its front panel. Written procedures in this chapter prepare the power supply for use and familiarize you with most front-panel operations.

• The power supply is shipped from the factory configured in the front-panel

operation mode. At power-on, the power supply is automatically set to operate in the front-panel operation mode. When in this mode, the frontpanel keys can be used. When the power supply is in remote operation mode, you can return to front-panel operation mode at any time by pressing the

Local

key if you did not previously send the front-panel lockout command. A change between front-panel and remote operation modes will not result in a change in the output parameters.

• When you press the key (the Lmt annunciator blinks), the

display of the power supply goes to the limit mode and the present limit values of the selected supply will be displayed. In this mode, you can also observe the change of the limit values when adjusting the knob. If you press

Display Limit

the key again or let the display time-out after several seconds, the power supply will return the display to the meter mode (the Lmt annunciator turns off). In this mode, the actual output voltage and current will be displayed.

• All outputs of the power supply can be enabled or disabled from the front panel using the key. When the output of the power supply is off, the OFF annunciator turns on and the three outputs are disabled.

• The display provides the present operating status of the power supply with annunciators and also informs the user of error codes. For example, the +6V supply is operating in CV mode and controlled from the front panel, then the CV and +6V annunciators will turn on. If, however, the power supply is remotely controlled, the Rmt annunciator will also turn on, and when the power supply is being addressed over GPIB interface, the Adrs annunciator will turn on. see

Display Limit

Output On/Off

"Display Annunciators"

on page 5 for more information.

Throughout this chapter the key to be pressed is shown in the left margin.

Power

Output On/Off

Chapter 2 Quick Start

To prepare the power supply for use

The following steps help you verify that the power supply is ready for use.

1 Check the list of supplied items.

Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Agilent Technologies Sales Office.

One appropriate power cord for your location.

One User's Guide.

This Service Guide.

Certificate of Calibration.

2 Verify that the correct power-line voltage setting is selected and that

the correct power-line fuse is installed.

The line voltage is set to 100, 115 or 230 Vac from the factory according to the input power option selected when you ordered the power supply. Change the voltage setting if it is not correct for your location (see the next page for detailed information). For 100 or 115 Vac operation, the correct fuse is 2.5 AT (Agilent part number 2110-0913) and for 230 Vac operation, the correct fuse is 2 AT (Agilent part number 2110-0587).

3 Connect the power cord and turn on the power supply.

A power-on self-test occurs automatically when you turn on the power supply. The front-panel display will light up while the power supply performs its power-on self- test. After performing the self-test, the power supply will go into the power-on / reset state; a ll outp u ts are d i sabled (the OFF annunciator turns on); the display is selected for the +6V supply (the +6V annunciator turns on); the knob is selected for voltage control.

4 Enable the outputs

Press the key to enable the outputs. The OFF annunciator turns off and the +6V and CV annunciators are lit. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. "Meter mode" means that the display shows the actual output voltage and current.

Output On/Off

Chapter 2 Quick Start

To prepare the power supply for use

1 Remove the power cord.

Remove the fuse-holder assembly with a flat-blade screwdriver from the rear panel.

3 Rotate the power-line voltage

selector until the correct voltage appears.

2 Install the corect line fuse.

Remove the power-line voltage selector from the power-line

100 or 115 Vac, 2.5 AT fuse 230 Vac, 2 AT fuse

4 Replace the power-line voltage

selector and the fuse-holder assembly in the rear panel.

100, 115 or 230 Vac

Install the correct fuse and verify that the correct line voltage appears in the window.

Power

Output On/Off

Chapter 2 Quick Start

To check the rated voltages of the power supply

The following procedures check to ensure that the power supply develops its rated voltage outputs with no load and properly responds to operation from the front panel.

For each step, use the keys shown on the left margins.

1 Turn on the power supply.

The power supply will go into the power-on / reset state; all outputs are disabled (the OFF annunciator turns on); the display is selected for the +6V supply (the

+6V annunciator turns on); and the knob is selected for voltage control.

2 Enable the outputs.

The OFF annunciator turns off and the +6V and CV annunciators are lit. The

blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. "Meter mode" means that the display shows the actual output voltage and current.

3 Check that the front-panel voltmeter properly responds to knob

control for +6V supply.

Turn the knob clockwise or counter clockwise to check that the voltmeter responds to knob control and the ammeter indicates nearly zero.

4 Ensure that the voltage can be adjusted from zero to the maximum

rated value.

Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until the voltmeter indicates 6.0 volts.

You can use the resolution selection keys to move the blinking digit to the right or

left when setting the voltage.

Chapter 2 Quick Start

To check the rated voltages of the power supply

+25V

-25V

5 Check the voltage function for the +25V supply.

Select the meter and adjust selection key for the +25V supply. The CV annunciator is still lit and the +25V annunciator will turn on. Repeat steps (3) and (4) to check the voltage function for the +25V supply.

6 Check the voltage function for the -25V supply.

Select the meter and adjust selection key for the -25V supply. The CV annunciator is still lit and the -25V annunciator will turn on. Repeat steps (3) and (4) to check the voltage function for the -25V supply.

Power

Output On/Off

Display Limit

Vol/Cur

Chapter 2 Quick Start

To check the rated currents of the power supply

The following procedures check to ensure that the power supply develops its rated current outputs with a short and properly responds to operation from the front panel.

For each step, use the keys shown on the left margin.

1 Turn on the power supply.

The power supply will go into the power-on / reset state; all outputs are disabled (the OFF annunciator turns on); the display is selected for the +6V supply (the

+6V annunciator turns on); and the knob is selected for voltage control.

2 Connect a short across (+) and (-) output terminals of +6V supply with

an insulated test lead.

3 Enable the outputs.

The OFF annunciator turns off and the +6V annunciator turns on. The CV or CC ann un ci at or is li t d ep en din g o n t he re si st an ce of th e t es t l ea d. Th e blinking

digit can be adjusted by turning the knob. Notice that the display is in the meter mode. "Meter mode" means that the display shows the actual output voltage and current.

4 Adjust the voltage limit value to 1.0 volt.

Set the display to the limit mode (the Lmt annunciator will be blinking). Adjust the voltage limit to 1.0 volt to assure CC operation. The CC annunciator will light.

5 Check that the front-panel ammeter properly responds to knob control

for the +6V supply.

Set the knob to the current control, and turn the knob clockwise or counter clockwise when the display is in the meter mode (the Lmt annunciator is off). Check that the ammeter responds to knob control and the voltmeter indicates nearly zero (actually, the voltmeter will show the voltage drop caused by the test lead).

Chapter 2 Quick Start

To check the rated currents of the power supply

+25V

-25V

Note

6 Ensure that the current can be adjusted from zero to the maximum

rated value.

Adjust the knob until the ammeter indicates 0 amps and then until the ammeter indicates 5.0 amps.

7 Check the current function for the +25V supply.

Disable the outputs by pressing the key and connect a short

Output On/Off

across (+) and (COM) output terminals of the ±25V supply with an insulated test lead. Repeat steps (3) through (6) after selecting the meter and adjust selection key for the +25V supply.

8 Check the current function for the -25V supply.

Disable the outputs by pressing the key and connect a short

Output On/Off

across (-) and (COM) output terminals of the ±25V supply with an insulated test lead. Repeat steps (3) through (6) after selecting the meter and adjust selection key for the -25V supply.

If an error has been detected during the output checkout procedures, the ERROR annunciator will turn on. See "Error Messages" for more information, starting on page 113 in chapter 5 of the User's Guide.

You can use the resolution selection keys to move the blinking digit to the

right or left when setting the current.

Power

Output On/Off

Display Limit

Chapter 2 Quick Start

To use the power supply in constant voltage mode

To set up the power supply for constant voltage (CV) operation, proceed as follows.

For each step, use the keys shown on the left margin.

1 Connect a load to the desired output terminals.

With power-off, connect a load to the desired output terminals.

2 Turn on the power supply.

The power supply will go into the power-on / reset state; all outputs are disabled (the OFF annunciator turns on); the display is selected for the +6V supply (the

+6V annunciator turns on); and the knob is selected for voltage control.

3 Enable the outputs.

The OFF annunciator turns off and the +6V and CV annunciators are lit. The

blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. "Meter mode" means that the display shows the actual output voltage and current.

To set up the power supply for +25V supply or -25V supply operation, you should press the or key to select the display and adjust for +25V supply or -25V supply before proceeding to the next step.

4 Set the display for the limit mode.

Notice that the Lmt annunciator blinks, indicating that the display is in the limit mode. When the disp lay is in the limit mode, you can see the voltage and current limit values of the selected supply.

+25V -25V

In constant voltage mode, the voltage values between meter mode and limit mode are the same, but the current values are not. Further if the display is in the meter mode, you cannot see the change of current limit value when adjusting the knob. We recommend that you should set the display to "limit" mode to see the change of current limit value in constant voltage mode whenever adjusting the knob.

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