Agilent E3632A Specifications Sheet

Service Guide

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The Agilent E3632A is a high performance 120 watt-dual range DC power
supply with GPIB and RS-232 interfaces. The combination of bench-top and
system features in this power supply provides versatile solutions for your
design and test requirements.

Convenient bench-top features

• Dual range

• Easy-to-use knob control settings

• Highly visible vacuum-fluorescent display meters

• Hghl accuracy and high resolution

• Remote voltage sensing

• Overvoltage and overcurrent protection

• Output on/off

• 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

• Software calibration, no internal adjustments required

Agilent E3632A
DC Power Supply

The Front Panel at a Glance

1 15V/7A range selection key
2 30V/4A range selection key
3 Overvoltage protection key
4 Overcurrent protection key
5 Display limit key
6 Recall operating state key
7 Store operating state/Local key

2

8 Error/Calibrate key
9 I/O Configuration/Secure key

10 Output On/Off key
11 Control knob
12 Resolution selection keys
13 Voltage/current adjust selection key

1 15V/7A range selection key Selects the 15V/7A range and allows the full rated output

to 15V7A.

2 30V/4A range selection key Selects the 30V/4A range and allows the full rated output

to 30V/4A.

3 Overvoltage protection key Enables or disables the overvoltage protection function,

sets trip voltage level, and clears the overvoltage condition.

4 Overcurrent protection key Enables or disables the overcurrent protection function,

sets trip current level, and clears the overcurrent condition.

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

knob adjustment for setting limit values.

6 Recall operating state key Reca l ls a p revio usly stored operati ng st ate fr om lo cation

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

1

7 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.

2

8 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).

3

9 I/O Configuration / Secure key

Configures the power supply for remote interfaces

/ or secure or unsecure the power supply for calibration.

10 Output On/Off key Enables or disables the power supply outputs. This key toggles

between on and off.

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

clockwise or counter clockwise.

12 Resolution selection keys Move the blinking digit to the right or left.

13 Voltage/current adjust selection key Selects the knob control function for voltage

or current adjustment.

1

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

interface mode.

2

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

the power supply.

3

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

calibration mode.

3

Front-Panel Voltage and Current Limit Settings

You can set the voltage and current limit values 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 voltage and current limit value.

1 Select the desired range using the range selection keys after turning on the power

supply.

2 Press the key to show the limit values on the display.

3 Move the

and change the blinking digit value to the desired vltage limit by turning the control
knob. If the display limit times out, press the key again.

4 Set the knob to current control mode using the voltage/current adjust selection key.

5 Move the blinking digit to the appropriate position using the resolution selection keys

and change the blinking digit value to the desired current limit by turning the control
knob.

6 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 or the display will go to the monitor mode immediately by pressing
the

Display Limit

blinking digit to the appropriate position using the resolution selection keys

Display Limit

Output On/Off

Output On/Off

key again.

Note

All front panel keys and controls can be disabled with remote interface
commands. The Agilent E3632A must be in "Local" mode for the front panel
keys and controls to function.

4

Display Annunciators

Adrs Power supply is addressed to listen or talk over a remote interface.
Rmt Power supply is in remote interface mode.
15V Shows the 15V/7A range is selected.
30V Shows the 30V/4A range is selected.
OVP The overvoltage protection function is enabled when the annunciator

turns on or the overvoltage protection circuit has caused the power
supply to shutdown when the annunciator blinks.

OCP The overcurrent protection function is enabled when the annunciator

turns on or the overcurrent protection circuit has caused the power
supply to shutdown when the annunciator blinks.

CAL The power supply is in calibration mode.
Limit The display shows the limit values of voltage and current.
ERROR Hardware or remote interf ace command errors are detected a nd the error

OFF The output of the power supply is disabled (See

Unreg The output of the power supply is unregulated (output is neither CV

CV The power supply is in constant voltage mode.
CC The power supply is in constant current mode.

bit has not been cleared.

information

nor CC).

).

page 52 for more

To review the display annunciators, hold down key as you

Display Limit

turn on the power supply.

5

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

6

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.

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.

If your Agilent E3632A fails within three years of purchase, Agilent will
repair or replace it free of charge. Call 1-800-258-5165 ("Express
Exchange") in the United States, or contact your nearest Agilent
Technologies Sales Office.

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

7

8

Contents

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 26
To Use the Power Supply in Constant Voltage Mode 28
To Use the Power Supply in Constant Current Mode 30
To Store and Recall the Instrument State 32
To Program Overvoltage Protection 34

Setting the OVP Level and Enable the OVP Circuit 34
Checking OVP Operation 35
Clearing the Overvoltage Condition 35

To Program Overcurrent Protection 37

Setting the OCP Level and Enable the OCP Circuit 37
Checking OCP Operation 38
Clearing the Overcurrent Condition 38

To Rack Mount the Power Supply 39

Contents

Chapter 3 Calibration Procedures

Agilent Technologies Calibration Services 43
Calibration Interval 43
Automating Calibration Procedures 44
Recommended Test Equipment 44
Test Considerations 45
Performance Verification Tests 46

Self-Test 46
Performance Verification Tests 46

Measurement Techniques 47

Setup for Most Tests 47
Electronic Load 48
Current-Monitoring Resistor 48
Programming 48

9

Contents

Contents

Chapter 3 Calibration Procedures (continued)

Constant Voltage (CV) Verifications 49

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

Constant Current (CC) Verifications 53

Constant Current Test Setup 53
Current Programming and Readback Accuracy 53
CC Load Regulation 54
CC Line Regulation 55
Normal Mode Current Noise (CC Ripple and Noise) 55
Common Mode Current Noise 56

Performance Test Record for Agilent Technologies E3632A 57

CV Performance Test Record 57
CC Performance Test Record 57

Calibration Security Code 58

To Unsecure the Power Supply for Calibration 59

To Unsecure the Power Supply Without the Security Code 60
Calibration Count 61
Calibration Message 61
General Calibration/Adjustment Procedure 62

Voltage and OVP Calibration 63

Current and OCP Calibration 65
Aborting a Calibration in Progress 68
Calibration Record for Agilent Technologies E3632A 69
Error Messages 70
Calibration Program 72

10

Chapter 4 Theory of Operation

Block Diagram Overview 79
AC Input and Bias Supplies 81
Floating Logic 82
D-to-A Converter 84
A-to-D Converter 85
Power Mesh and Control 86
Earth-Referenced Logic 88
Front Panel 88

Contents

Chapter 5 Service

Operating Checklist 91
Types of Service Available 92
Repacking for Shipment 93
Electrostatic Discharge (ESD) Precautions 94
Surface Mount Repair 94
To Replace the Power-Line Fuse 94
To Disconnect the Output Using an External Relay 95
Troubleshooting Hints 96
Self-Test Procedures 98

Chapter 6 Replaceable Parts

Replaceable Parts 102

To Order Replaceable Parts 102

Backdating and Part Changes 102
E3632-60002 Main PC Assembly 103
E3632-60004 Front-Panel Display PC Assembly 111
E3632-60005 Front Frame Assembly 112
E3632A Power Supply Assembly 112
Manufacturer’s List 113

Contents

Chapter 7 Backdating

Chapter 8

Mechanical Disassembly 103
Component Locator 120
Power Circuit and Protection Circuit Schematic 121
Bias Supply Schematic 122
ADC and DAC System Schematic 123
Floating Logic Schematic 124
Earth-Referenced Logic Schematic 125
Display and Keyboard Schematic 126

11

Contents

Contents

12

1

1

Specifications

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.

specifications are listed in the following pages. Specifications

characteristics, which are not warranted but are descriptions of

14

Chapter 1 Specifications

Performance Specifications

Performance Specifications

Output Ratings (@ 0°C - 40°C)

Low range 0 to +15 V/0 to 7 A
High range 0 to +30 V/0 to 4 A

[1]

Programming Accuracy

Voltage 0.05% + 10 mV
Current 0.2% + 10 mA

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

1

Readback Accuracy

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

Voltage 0.05% + 5 mV
Current 0.15 % + 5 mA

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

Normal mode voltage <0.35 mV rms and 2 mV p-p
Current <2 mA rms
Common mode current <1.5 mA rms

Load Regulation, ±(% of output + offset)

Change in output voltage or current for any load change within ratings with remote
sensing connected.

Voltage <0.01% + 2 mV
Current <0.01% + 250 mA

Line Regulation, ±(% of output + offset)

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

[1]

Accuracy specifications are after an 1-hour warm-up with no load and calibration at

25°C

15

Chapter 1 Specifications

Performance Specifications

Programming Resolution

Voltage 1 mV
Current 0.5 mA

Readback Resolution

Voltage 0.5 mV
Current 0.1 mA

Front Panel Resolution

Voltage 1 mV
Current 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

Command Processing Time

Average time for output voltage to begin to change after receipt of digital data when
the power supply is connected directly to the GPIB or RS-232 is less than 100 msec.

OVP and OCP Accuracy, (% of output + offset)

OVP 0.5% + 0.5 V
OCP 0.5% + 0.5 A

Activation time
occurs.

OVP <1.5 msec when the trip voltage is equal or greater than 3 V

OCP <10 msec

: Average time for output to start to drop after OVP or OCP condition

<10 msec when the trip voltage is less than 3 V

16

Chapter 1 Specifications

Supplemental Characteristics

Supplemental Characteristics

Output Programming Range (maximum programmable values)

Low range 0 to 15.45 V/0 to 7.21 A
High range 0 to 30.9 V/0 to 4.12 A
OVP 1 V to 32 V
OCP 0 A 7.5 A

Remote Sensing Capability

Voltage drop Up to 1 V per each lead
Load regulation Add 5 mV to spec for each 1-volt change in the + output lead

due to load current changes.

Load voltage Subtract voltage drop in load leads from specified output

voltage atiing.

Temperature Coefficient, ±(% of output + offset)

Maximum change in output/readback per °C after a 30-minute warm-up

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

1

Stability, ±(% of output + offset)

Following a 1 hour warm-up, change in output over 8 hours under constant load, line,
and ambient temperature

Voltage 0.02% + 1 mV
Current 0.1% + 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.

Full load

Up 50 msec 20 msec
Down 45 msec 400 msec

No load

17

Chapter 1 Specifications

Supplemental Characteristics

Output Terminal Isolation (maximum, from chassis ground)

±60 Vdc when connecting shorting conductors without insulation to the (+) output to
the (+) sense and the (-) output and the (-) sense terminals.

±240 Vdc when connecting insulated shorting conductors to the (+) output to the (+)
sense and the (-) output and the (-) sene terminals.

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

500 VA with full load

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

18

Chapter 1 Specifications

Supplemental Characteristics

Dimensions

213 mmW x 133 mmH x 348 mmD (8.4 x 5.2 x 13.7 in)

*See below for detailed information.

Weight

Net 9.5 kg (21 lb)
Shipping 12 kg (26 lb)

*

1

Figure 1-1. Dimensions of Agilent E3632A Power Supply

19

Chapter 1 Specifications

Supplemental Characteristics

20

2

2

Quick Start

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.

• The power supply has two output ranges of 15V/7A or 30V/4A. This feature
allows more voltage at a lower current or more current at a lower voltage.
The desired output range is selected from the front panel or over the remote
interfaces. The
range.

• When you press the key (the
display of the power supply goes to the limit mode and the present limit
values will be displayed. In this mode, you can also observe the change of
the limit values when adjusting the knob. If you press the
key again or let the display time-out after several seconds, the power supply
will return the display to the meter mode (the
In this mode, the actual output voltage and current will be displayed.

• The outputs of the power supply can be enabled or disabled from the front
panel using the key. When the output is off, the
annunciator turns on and the output is 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
power supply is operating in CV mode in the 15V/7A range and controlled
from the front panel, then the
however, the power supply is remotely controlled, the
also turn on, and when the power supply is being addressed over GPIB
interface, the
page 6 for more information.

15V or 30V annunciator indicates the presently selected

Display Limit

Output On/Off

CV and +15V annunciators will turn on. If,

Adrs annunciator will turn on. see “Display Annunciators”, on

Limit annunciator blinks), the

Display Limit

Limit annunciator turns off).

OFF

Rmt annunciator will

22

Chapter 2 Quick Start

To Prepare the Power Supply for Use

To Prepare the Power Supply for Use

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

Power

Check the list of supplied items.

1

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.

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

2

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 4 AT
(Agilent part number 2110-0996) and for 230 Vac operation, the correct fuse is

2.5 AT (Agilent part number 2110-0999).

Connect the power cord and turn on the power supply.

3

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; all outputs are disabled (the
on); the 15V/7A rage is selected (the +
selected for voltage control. Notice that the
turn on.

15V annunciator turns on); the knob is

OVP and OCP annunciators also

OFF annunciator turns

2

Output On/Off

Enable the outputs.

4

Press the key to enable the outputs. The
turns off and the
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

15V, OVP, OCP a nd CV annunc iato rs are li t. The blinking digit

OFF annunciator

23

Chapter 2 Quick Start

To Prepare the Power Supply for Use

1 Remove the power cord. Rem ove

the fuse-holder assembly with a flat­blade screwdriver from the rear

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 module.

100 or 115 Vac, 4 AT fuse
230 Vac, 2.5 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.

24

Chapter 2 Quick Start

To Check the Rated Voltages of the Power Supply

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.

2

Power

Output On/Off

Turn on the power supply.

1

The power supply will go into the power-on / reset state; the output is disabled

OFF annunciator turns on); the 15V/7A range is selected (the +15V

(the
annunciator turns on); and the knob is selected for voltage control.

Enable the outputs.

2

OFF annunciator turns off and the 15V, OVP, O CP and CV annunciators are

The
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.

Check that the front-panel voltmeter properly responds to knob

3

control.

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

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

4

rated value.

Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob
until the voltmeter indicates 15.0 volts.

1

1

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

left when setting the voltage.

25

Chapter 2 Quick Start

To Check the Rated Currents of the Power Supply

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.

Power

Output On/Off

Display Limit

Volt/Curr

Turn on the power supply.

1

The power supply will go into the power-on / reset state; the output is disabled

OFF annunciator turns on); the 15V/7A range is selected (the 15V

(the
annunciator turns on); and the knob is selected for voltage control.

Connect a short across (+) and (-) output terminals with an insulated

2

test lead.

Enable the outputs.

3

OFF annunciator turns off and the 15V, OVP and OCP annunciator turns

The
on. The

CV or CC annunciator is lit depending on the resistance of the test lead.

The blinking di g it can be adju sted by tu r ning the kno b. N otice th at t he displ ay
is in the meter mode. "Meter mode" means that the display shows the actual
output voltage and current.

Adjust the voltage limit value to 1.0 volt.

4

Set the display to the limit mode (the
the voltage limit to 1.0 volt to assure CC operation. The

Lmt annunciator will be blinking). Adjust

CC annunciator will

light.

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

5

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).

26

Chapter 2 Quick Start

To Check the Rated Currents of the Power Supply

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

6

rated value.

Adjust the knob until the ammeter indicates 0 amps and then until the ammeter
indicates 7.0 amps.

Note 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 121 in chapter 5 of the User's Guide.

1

2

1

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

right or left when setting the current.

27

Chapter 2 Quick Start

To Use the Power Supply in Constant Voltage Mode

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.

Connect a load to the desired output terminals.

1

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

Power

Display Limit

Volt/Curr

Turn on the power supply.

2

The power supply will go into the power-on / reset state; output is disabled (the

OFF annunciator turns on); the 15V/7A range is selected (the 15V annunciator

turns on); and the knob is selected for voltage control.

To operate the power supply in the 30V/4A range, press the key before

30V,4A

proceeding to the next step. The 30V annunciator turns on.

Set the display for the limit mode.

3

Notice that the

Limit 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 power supply.

In constant voltage mode, the voltage values between meter mode and
limit mode are the same, but the current values are not. Moreover 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.

Adjust the knob for the desired current limit.

4

1

Check that the Lmt annunciator still blinks. Set the knob for current control.
The second digit of ammeter will be blinking. The blinking digit can be changed
using the resolution selection keys and the blinking digit can be adjusted by
turning the knob. Adjust the knob to the desired current limit.

1

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

left when setting current.

28

Chapter 2 Quick Start

To Use the Power Supply in Constant Voltage Mode

Volt/Curr

Adjust the knob for the desired output voltage.

5

1

Check that the Limit annunciator still blinks. Set the knob for voltage control.
The second digit of the voltmeter will be blinking. Change the blinking digit
using the resolution selection keys and adjust the knob to the desired output
voltage.

Display Limit

Return to the meter mode.

6

Press the key or let the display time-out after several seconds
to return to the meter mode. Notice that the

Display Limit

Limit annunciator turns off and

the display shows "OUTPUT OFF" message.

Output On/Off

Enable the outputs

7

OFF annunciator turns off and the 15V or 30V, OVP, OCP, and CV

The
annunciators are lit. Notice that the display is in the meter mode. In the meter
mode, the display shows the actual output voltage and current.

Verify that the power supply is in the constant voltage mode.

8

If you operate the power supply in the constant voltage (CV) mode, verify that

CV annunciator is lit. If the CC annunciator is lit, choose a higher current limit.

Note During actual CV operation, if a load change causes the current limit to be exceeded,

the power supply will automatically crossover to constant current mode at the preset
current limit and the output voltage will drop proportionately.

2

1

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

left when setting voltage.

29