Agilent Technologies E3634A, E3633A User Manual

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Service Guide

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The Agilent E3633A and Agilent E3634A are high performance 200 watt singleoutput dual range programmable DC power supplies with both GPIB and RS232 interfaces. The combination of bench-top and system features in these power supplies provides versatile solutions for your design and test requirements.

Convenient bench-top features

• Single-output dual range

• Easy-to-use knob control settings

• Highly visible vacuum-fluorescent display meters

• High 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

• Front and Rear output terminals

• Retrieving/Scrolling error messages on the display

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 E3633A and E3634A DC Power Supplies

The Front Panel at a Glance

1 8V/20A range selection key (E3633A) 25V/7A range selection key (E3634A) 2 20V/10A range selection key (E3633A) 50V/4A range selection key (E3634A)

3 Overvoltage protection key 4 Overcurrent protection key 5 Display limit key 6 Recall operating state key

7 Store operating state/Local key 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 8V/20A* or 25V/7A** range selection key Selects the 8V/20A or 25V/7A

range and allows the full rated output to 8V/20A or 25V/7A.

2 20V/10A* or 50V/4A** range selection key Selects the 20V/10A or

50V/4A range and allows the full rated output to 20V/10A or 50V/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 Recalls a previously stored operating state from

location ‘‘1’’, ‘‘2’’, or ‘‘3’’.

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.

8 E r ror / Cal ibrate k e y

Displays error codes generated during operation, selftest and calibration / or enables calibration mode (the power supply must be unsecured before performing calibration). See Service Guide for more details on calibration.

9 I/O Configuration / Secure key

Configures the power supply for remote interfaces / or secure or unsecure the power supply for calibration. See Service Guide for more details on how to secure or unsecure the power supply.

10 Output On/Off key Enables or disables the power supply output. 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.

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.

*For Agilent E3633A Model **For Agilent E3634A Model

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 values.

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

power supply.

2 Press the 3 Move the blinking digit to the appropriate position using the resolution

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

4 Set the knob to current control mode by pressing the 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

will go to output monitoring mode automatically to display the voltage and current at the output or the display will go to output monitoring mode immediately by pressing the

Display

key to show the limit values on the display.

Limit

Volt ag e Current

Output

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

On/Off

Output

key again.

On/Off

Display Limit

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

The Agilent E3633A and Agilent E3634A 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. 8V Shows the 8V/20A range is selected. (Agilent E3633A model) 20V Shows the 20V/10A range is selected. (Agilent E3633A model) 25V Shows the 25V/7A range is selected. (Agilent E3634A model) 50V Shows the 50V/4A range is selected. (Agilent E3634A model) 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 interface command errors are detected and

the error bit has not been cleared.

OFF The output of the power supply is disabled (For more information,

see page 52 in the User’s Guide).

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

nor CC).

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

To review the display annunciators, hold down key as you turn on

Display Limit

the power supply.

The Rear Panel at a Glance

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

5 GPIB (IEEE-488) interface connector 6 RS-232 interface connector

7 Rear output terminals

4 Power-line module

Use the front-panel key to:

I/O Config

• Select the GPIB or RS-232 interface (see chapter 3 in User’s Guide).

• Set the GPIB bus address (see chapter 3 in User’s Guide).

• Set the RS-232 baud rate and parity (see chapter 3 in User’s Guide).

In This Book

This is the Service Guide for your Agilent E3633A and E3634A DC power supplies. Unless otherwise stated, the information in this manual applies to both two models.

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

Quick Start Chapter 2 prepares the power supply for use and helps you get 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 co ntains th e po wer sup ply ’s sch ematic s, disasse mbly 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 E3633A or Agilent E3634A 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 1 Specifications

Performance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11 Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

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 - - - - - - - - - - - - - - - - - - - - - - - - 40

Contents

Chapter 3 Calibration Procedures

Agilent Technologies Calibration Services - - - - - - - - - - - - - - - - - 45 Calibration Interval - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 Automating Calibration Procedures - - - - - - - - - - - - - - - - - - - - - - 46 Test Considerations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 Recommended Test Equipment - - - - - - - - - - - - - - - - - - - - - - - - - - 47 Performance Verification Tests - - - - - - - - - - - - - - - - - - - - - - - - - - 48

Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 48 Performance Verification Tests - - - - - - - - - - - - - - - - - - - - - - - 48

Measurement Techniques- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

Setup for Most Tests - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49 Electronic Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49 General Measurement Techniques - - - - - - - - - - - - - - - - - - - - - 50 Current-Monitoring Resistor- - - - - - - - - - - - - - - - - - - - - - - - - - 50 Programming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50

Contents

Chapter 3 Calibration Procedures (Continued)

Constant Voltage (CV) Verifications- - - - - - - - - - - - - - - - - - - - - - - 51

Constant Voltage Test Setup - - - - - - - - - - - - - - - - - - - - - - - - - - 51 Voltage Programming and Readback Accuracy - - - - - - - - - - - 51 CV Load Effect (Load Regulation) - - - - - - - - - - - - - - - - - - - - - 52 CV Source effect (Line Regulation)- - - - - - - - - - - - - - - - - - - - - 53 CV PARD (Ripple and Noise) - - - - - - - - - - - - - - - - - - - - - - - - - 54 Load Transient Response Time - - - - - - - - - - - - - - - - - - - - - - - - 55

Constant Current (CC) Verifications - - - - - - - - - - - - - - - - - - - - - - 56

Constant Current Test Setup - - - - - - - - - - - - - - - - - - - - - - - - - - 56 Current Programming and Readback Accuracy - - - - - - - - - - - 56 CC Load Effect (Load Regulation) - - - - - - - - - - - - - - - - - - - - - 57 CC Source Effect (Line Regulation) - - - - - - - - - - - - - - - - - - - - 58

CC PARD (Ripple and Noise) - - - - - - - - - - - - - - - - - - - - - - - - - 58 Common Mode Current Noise - - - - - - - - - - - - - - - - - - - - - - - - - - - 59 Performance Test Record for Agilent E3633A and E3634A - - - - 60

CV Performance Test Record - - - - - - - - - - - - - - - - - - - - - - - - - 60

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 - 63 Calibration Count - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 64 Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 64 General Calibration/Adjustment Procedure - - - - - - - - - - - - - - - - - 65

Front Panel Voltage and Current Calibration - - - - - - - - - - - - - 66 Aborting a Calibration in Progress - - - - - - - - - - - - - - - - - - - - - - - - 71 Calibration Record for Agilent E3633A/E3634A - - - - - - - - - - - - - 72 Error Messages - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73 An Example program of Excel 97 for Calibration - - - - - - - - - - - - 75

Chapter 4 Theory of Operation

Block Diagram Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 85 AC Input and Bias Supplies- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87 Floating Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88 D-to-A Converter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90 A-to-D Converter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 91 Power Mesh and Control- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 92 Earth-Referenced Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94 Front Panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94

Contents

Chapter 5 Service

Operating Checklist - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97

Is the Power Supply Inoperative? - - - - - - - - - - - - - - - - - - - - - - 97 Does the Power Supply Fail Self-Test?- - - - - - - - - - - - - - - - - - 97

Types of Service Available - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98

Standard Repair Service (worldwide) - - - - - - - - - - - - - - - - - - 98

Express Exchange (U.S.A. only)- - - - - - - - - - - - - - - - - - - - - - - 98 Repacking for Shipment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99 Electrostatic Discharge (ESD) Precautions - - - - - - - - - - - - - - - 100 Surface Mount Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 100 To Replace the Power-Line Fuse - - - - - - - - - - - - - - - - - - - - - - - - 100 To Disconnect the Output Using an External Relay - - - - - - - - - 101

Installation Procedure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 101 Troubleshooting Hints - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 102

Unit is Inoperative - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 102

Unit Reports Errors 740 to 750 - - - - - - - - - - - - - - - - - - - - - - - 102

Unit Fails Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 102

Bias Supplies Problems - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 103 Self-Test Procedures- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104

Power-On Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104

Complete Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104

Contents

Chapter 6 Replaceable Parts

Replaceable Parts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 108

To Order Replaceable Parts - - - - - - - - - - - - - - - - - - - - - - - - - 108

Backdating and Part Changes - - - - - - - - - - - - - - - - - - - - - - - - 108 E3633/E3634-60002 Main PC Assembly - - - - - - - - - - - - - - - - - - - 109 E3633-60003 Front-Panel Display PC Assembly - - - - - - - - - - - - 119 E3633-60011 Front Frame Assembly - - - - - - - - - - - - - - - - - - - - - 120 E3633A/E3634A Power Supply Assembly - - - - - - - - - - - - - - - - - 120 Manufacturer’s List - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 121

Chapter 7 Backdating

Chapter 8 Schematics

Contents

Specifications

The performance specifications are listed in the following pages. Specifications are warranted in the temperature range of 0 to 40°C with a resistive load. Supplemental characteristics, which are not warranted but are descriptions of performance determined either by design or testing. Chapter 3 ‘‘Calibration Procedures’’ contains procedures for verifying the performance specifications.

Chapter 1 Specifications

Performance Specifications

Table 1-1. Performance Specifications

Parameter Agilent E3633A Agilent E3634A Output Ratings

(@ 0 °C - 40 °C)

Programming Accuracy

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

Readback A ccuracy

12 months (over GPIB and RS-232 or front panel with respect to actual output @ 25 °C ± 5 °C), ±(% of output + offset)

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

Load Regulation, ±(% of output + offset)

Line Regulation, ±(% of output + offset)

Programming Resolution Voltage 1 mV 3 mV

Readback Resolution Voltage 0.5 mV 1.5 mV

Front Panel Resolution Voltage 1 mV

[1] [2]

Low Range 0 to +8 V/0 to 20 A 0 to +25 V/0 to 7 A High Range 0 to +20 V/0 to 10 A 0 to +50V/0 to 4 A

[1]

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

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

Normal mode voltage

Normal mode current

Common mode current

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

Current 1 mA 0.5 mA

Current 1 mA (< 10A), 10mA (

<0.35 mV rms and 3 mV p-p

<2 mA rms

<1.5 uA rms

<0.5 mV rms and 3 mV p-p

≥ 10A)

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Chapter 1 Specifications

Performance Specifications

Transient Response Time

Less than 50 msec for output to 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 : Average time for output to start to drop after OVP or OCP

condition occurs.

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

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

OCP <10 msec

Chapter 1 Specifications

Supplemental Characteristics

Table 1-2. Supplemental Characteristics

Parameter Agilent E3633A Agilent E3634A

Output Programming Range

(maximum programmable values)

Voltage Programming Speed: Maximum time required

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

Low Range 0 to +8.24 V/

0 to 20.6 A

High Range 0 to +20.6 V/

0 to 10.3 A

OVP 1 V to 22 V 1 V to 55 V

OCP 0 A to 22 A 0 A to 7.5 A

Full Load No Load Full Load No Load

Up 95 msec 45 msec 80 msec 100 msec

Down 30 msec 450 msec 30 msec 450 msec

0 to +25.75 V/ 0 to 7.21 A

0 to +51.5V/ 0 to 4.12 A

Remote Sensing Capability

Voltage drop Up to 0.7 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 rating.

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

Stability, ±(% of output + offset)

Following 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

Chapter 1 Specifications

Supplemental Characteristics

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

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 (-) sense 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

700 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.

Chapter 1 Specifications

Supplemental Characteristics

Storage Temperature

-20 to 70 °C for storage environment.

Environmental Conditions

Designed for indoor use in an installation category II, pollution degree 2 environment. Designed to operate at a maximum relative humidity of 95 % and at altitudes of up to 2000 meters.

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)

Figure 8-1. Dimensions of Agilent E3633A and E3634A Power Supplies

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

Store

(Local) key if you did not previously send the front-panel lockout

Local

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. 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

20V for the E3633A and 25V or 50V for the E3634A annunciator indicates

or the presently selected range.

• When you press key (the

Display Limit

Limit annunciator flashes), 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 Limit

display time-out after several seconds, the power supply will return the display to the meter mode (the

Limit annunciator turns off). In this mode,

the actual output voltage and current will be displayed.

• The output of the power supply can be enabled or disabled from the front panel by pressing key. When the output is off, the

Output On/Off

OFF 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 8V/20A* or 25V/7A** range and controlled from the front panel, then the

CV and 8V* or 25V** annunciators

will turn on. If, however, the power supply is remotely controlled, the annunciator will also turn on, and when the power supply is being addressed over GPIB interface, the

Adrs annunciator will turn on. See “Display

Annunciators’’ on page 5 for more information.

Rmt

*For Agilent E3633A Model **For Agilent E3634A Model

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.

Power

Output On/Off

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 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 6.3 AT (Agilent part number 2110-1030) and for 230 Vac operation, the correct fuse is

3.15 AT (Agilent part number 2110-1031).

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; the output is disabled (the on); the 8V/20A* or 25V/7A** range is selected (the

OFF annunciator turns

8V* or 25V** annunciator

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

Notice that the

OVP and OCP annunciators also turn on.

4 Enable the outputs.

Output

Press key to enable the outputs. The

On/Off

8V* or 25**, OVP, OCP, and CV annunciators are lit. The flashing digit can be

OFF annunciator turns off and the

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.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 2 Quick Start

To Prepare the Power Supply for Use

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

Install the correct line fuse. Remove the power-line voltage selector from the power-line module.

100 or 115 Vac, 6.3 AT fuse 230 Vac, 3.15 AT fuse

Rotate the power-line voltage selector

until the correct voltage appears.

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 produces its rated voltage output 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; the output is disabled

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

2 Enable the outputs.

OFF annunciator turns off and the 8V* or 25V**, OVP, OCP, and CV

The annunciators are lit. The flashing 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.

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 ‘‘8.0 volts’’* or ‘‘25.0 volts’’**.

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

right or left when setting the voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Power

Output On/Off

Display Limit

Volt ag e Current

Chapter 2 Quick Start

To Check the Rated Currents of the Power Supply

The following procedures check to ensure that the power supply produces 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 margins.

1 Turn on the power supply.

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

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage

control.

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

test lead.

3 Enable the outputs.

OFF annunciator turns off and the 8V* or 25V**, OVP, and OCP

The annunciators turn on. The resistance of the test lead. The flashing 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 the voltage limit to 1.0 volt to assure CC operation. The light.

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

Set the knob to the current control, and turn the knob clockwise or counter clockwise when the display is in the meter mode (the 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).

CV or CC annunciator is lit depending on the

Lmt annunciator will be flashing). Adjust

CC annunciator will

Lmt annunciator is off).

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 2 Quick Start

To Check the Rated Currents of the Power Supply

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 ‘‘20.0 amps’’* or ‘‘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 123 in chapter 5 of the User’s Guide.

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

right or left when setting the voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Power

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; the output is disabled

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

20V,10A 50V,4A

Press * or ** key to operate the power supply in the 20V/10A* or 50V/4A** range before proceeding to the next step. The annunciator turns on.

3 Set the display to the limit mode.

Notice that the

Limit annunciator flashes, 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.

20V* or 50V**

Volt ag e Current

In constant voltage mode, the voltage values between the meter and limit modes 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 the constant voltage mode whenever adjusting the knob.

4 Adjust the knob for the desired current limit.

Check that the

Limit annunciator still flashes. Set the knob for current control.

The second digit of the ammeter will be flashing. The flashing digit can be changed using the resolution selection keys and the flashing digit can be adjusted by turning the knob. Adjust the knob to the desired current limit.

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

right or left when setting current.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 2 Quick Start

To Use the Power Supply in Constant Voltage Mode

Volt ag e Current

5 Adjust the knob for the desired output voltage.

Check that the

Limit annunciator still flashes. Set the knob for voltage control.

The second digit of the voltmeter will be flashing. Change the flashing digit using the resolution selection keys and adjust the knob to the desired output voltage.

Display Limit

6 Return to the meter mode.

Display

Press key or let the display time-out after several seconds to return to

Limit

the meter mode. Notice that the

Limit annunciator turns off and the display

shows “OUTPUT OFF” message.

Output On/Off

7 Enable the output.

OFF annunciator turns off and the 8V* (or 25V**) or 20V* (or 50V**), OVP,

The

OCP and CV 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.

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

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

the limit.

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

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

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

right or left when setting the current.

*For Agilent E3633A Model **For Agilent E3634A Model

Power

Display Limit

Chapter 2 Quick Start

To Use the Power Supply in Constant Current Mode

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

1 Connect a load to the output terminals.

With power-off, connect a load to the (+) and (-) output terminals.

2 Turn on the power supply.

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

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

20V,10A 50V,4A

Press * or ** key to operate the power supply in the 20V/10A* or 50V/4A** range before proceeding to the next step. The annunciator turns on.

3 Set the display to the limit mode.

Notice that the

Limit annunciator flashes, 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.

20V* or 50V**

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

4 Adjust the knob for the desired voltage limit.

Check that the

Limit annunciator still flashes and the second digit of voltmeter

flashes to indicate the knob is selected for voltage control. The flashing digit can be changed using the resolution keys and the flashing digit can be adjusted by turning the knob. Adjust the knob for the desired voltage limit.

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

right or left when setting the voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 2 Quick Start

To Use the Power Supply in Constant Current Mode

Volt ag e Current

5 Adjust the knob for the desired output current.

Check that the

Limit annunciator still flashes. Set the knob for current control.

The second digit of the ammeter will be flashing. Change the flashing digit using the resolution selection keys and adjust the knob to the desired output current.

Display Limit

6 Return to the meter mode.

Display

Press key or let the display time-out after several seconds to return the

Limit

meter mode. Notice that the

Limit annunciator turns off and the display shows

“OUTPUT OFF” message.

Output On/Off

7 Enable the output.

OFF annunciator turns off and the 8V* (or 25V**) or 20V* (or 50V**), OVP,

The

OCP and CC 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.

8 Verify that the power supply is in the constant current mode.

If you operate the power supply in the constant current (CC) mode, verify that

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

the limit.

Note During actual CC operation, if a load change causes the voltage limit to be exceeded,

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

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

right or left when setting the voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Store

Chapter 2 Quick Start

To Store and Recall the Instrument State

You can store up to three different operating states in non-volatile memory. This also enables you to recall the entire instrument configuration with just a few key presses from the front panel.

The memory locations are supplied with the reset states from the factory for front-panel operation. Refer to the description of page 96 in the User’s Guide for more information.

The following steps show you how to store and recall an operating state.

1 Set up the power supply for the desired operating state.

The storage feature “remembers” output range selection, the limit value settings of voltage and current, output on/off state, OVP and OCP on/off state, and OVP and OCP trip levels.

2 Turn on the storage mode.

Three memory locations (numbered 1, 2 and 3) are available to store the operating states. The operating states are stored in non-volatile memory and are remembered when being recalled.

command, starting on

*RST

STORE 1

This message appears on the display for approximately 3 seconds.

3 Store the operating state in memory location “3”.

Turn the knob to the right to specify the memory location 3.

STORE 3

To cancel the store operation, let the display time-out after about 3 seconds or press any other function key except the key. The power supply returns to the normal operating mode and to the function pressed.Save the operating state.

Store

Chapter 2 Quick Start

To Store and Recall the Instrument State

Store

Recall

4 Save the operating state.

The operating state is now stored. To recall the stored state, go to the following steps.

DONE

5 Turn on the recall mode.

Memory location “1” will be displayed in the recall mode.

RECALL 1

This message appears on the display for approximately 3 seconds.

6 Recall the stored operating state.

Turn the knob to the right to change the displayed storage location to 3.

RECALL 3

If this setting is not followed within 3 seconds with key stroke, the power supply returns to normal operating mode and will not recall the instrument state 3 from memory.

7 Restore the operating state.

The power supply should now be configured in the same state as when you stored the state on the previous steps.

Recall

DONE

This message appears on the display for approximately 1 second.

Power

Output On/Off

Over Vol ta ge

Chapter 2 Quick Start

To Program Overvoltage Protection

Overvoltage protection guards the load against output voltages that reach a specified value greater than the programmed protection level. It is accomplished by shorting the output via an internal SCR when the trip level is set to equal or greater than 3 volts, or by programming the output to 1 volt when the trip level is set to less than 3 volts.

The following steps show how to set the OVP trip level, how to check OVP operation, and how to clear overvoltage condition.

Setting the OVP Level and Enable the OVP Circuit

1 Turn on the power supply.

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

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for

2 Enable the output.

OFF annunciator turns off and the display will go to the meter mode.

The

3 Enter the OVP menu and set the trip level.

voltage

control.

Over Vol ta ge

LEVEL 22222.0V (E3633A)

LEVEL 55555.0V (E3634A)

You will see the above message on the display when you enter the OVP menu. Adjust the control knob for the desired OVP trip level.

Note that you cannot set the trip levels to lower than 1.0 volt.

4 Enable the OVP circuit.

OVP ON

You will see the above message after pressing key.

*For Agilent E3633A Model **For Agilent E3634A Model

Over Vol ta ge

Chapter 2 Quick Start

To Program Overvoltage Protection

5 Exit the OVP menu.

CHANGED

The “CHANGED” message is highlighted for a second to show that the new OVP trip level is now in effect. If the OVP settings are not changed, “NO CHANGE” will be displayed. The power supply will exit the OVP menu and the display will return to the meter mode. Check that the

OVP annunciator turns

on.

Checking OVP Operation

To check OVP operation, raise the output voltage to near the trip point. Then very gradually increase the output by turning the knob until the OVP circuit trips. This will cause the power supply output to drop to near zero, the annunciator to blink, and the

CC annunciator to turn on. The “OVP TRIPPED”

message also appears on the display.

Clearing the Overvoltage Condition

When the OVP condition occurs (the “OVP TRIPPED” message is shown on the display), the voltage source such as a battery, disconnect it first. Clear the overvoltage condition by adjusting output voltage level or by adjusting OVP trip level.

The following steps show how to clear the overvoltage condition and get back to normal mode operation. In the following steps, the display will go back to “OVP TRIPPED” if you let the display time out after about several seconds.

• Adjust output voltage level

OVP annunciator flashes. When it was caused by an external

OVP

Display Limit

Over Vol ta ge

1 Lower the output voltage level.

Lower the output voltage level below the OVP trip point after pressing key. The

OVP and Limit annunciators are blinking.

2 Move to the clear mode.

OVP

OVP CLEAR

OVPOVP

Over

Press key twice to move to the OVP CLEAR mode. The “OVP ON”

Vol ta ge

Display Limit

message appears on the display. Turn the knob to the right until the above message appears on the display.

Over Vol ta ge

Chapter 2 Quick Start

To Program Overvoltage Protection

3 Clear the overvoltage condition and exit this menu.

Now, when you press key again, the “DONE” message is displayed for a s ec o nd a n d th e

OVP annunciator will not blink any more. The output will return

Over Vol ta ge

to meter mode.

• Adjust OVP trip level

1 Raise the OVP trip level.

Over

Press key and turn the knob to raise the OVP trip level.

Vol ta ge

2 Move to the OVP CLEAR mode.

OVP

OVP CLEAR

OVPOVP

Over

Press key to move to the OVP CLEAR mode. The “OVP ON” message

Vol ta ge

appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overvoltage condition and exit this menu.

Now, when you press key again, the “DONE’’ message is displayed for a second and the

Over Vol ta ge

OVP annunciator will not blink any more. The output will

return to the meter mode.

Power

Output On/Off

Over Current

Chapter 2 Quick Start

To Program Overcurrent Protection

Overcurrent protection guards the load against output currents that reach a specified value greater than the programmed protection level. It is accomplished by programming the output current to zero.

The following steps show how to set the overcurrent protection trip level, how to check OCP operation and how to clear overcurrent condition.

Setting the OCP Level and Enable the OCP Circuit

1 Turn on the power supply.

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

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

2 Enable the output.

OFF annunciator turns off and the display will go to the meter mode.

The

3 Enter the OCP menu and set the trip level.

Over Current

LEVEL 22222.0 A

LEVEL 7777.5 A

(E3633A)

(E3634A)

You will see the above message on the display when you enter the OCP menu. Adjust the knob for the desired OCP trip level.

4 Enable the OCP circuit.

OCP ON

You will see the above message after pressing the key.

*For Agilent E3633A Model **For Agilent E3634A Model

Over Current

Chapter 2 Quick Start

To Program Overcurrent Protection

5 Exit the OCP menu.

CHANGED

The “CHANGED” message is displayed for a second to show that the new OCP trip level is now in effect. If the OCP settings are not changed, “NO CHANGE” will be displayed. The power supply will exit the OCP menu and the display will return to the meter mode. Check that the

OCP annunciator turns on.

Checking OCP Operation

To check OCP operation, raise the output current to near the trip point. Then very gradually increase the output by turning the knob until the OCP circuit trips. This will cause the power supply’s output current to drop to zero and the

OCP annunciator to blink. The “OCP TRIPPED” message also appears on the

display.

Clearing the Overcurrent Condition

When the OCP condition occurs (the “OCP TRIPPED” message is shown on the display), the voltage sources such as a battery, disconnect it first. Clear the overcurrent condition by adjusting output current level or by adjusting OCP trip level.

The following steps show how to clear the overcurrent condition and get back to normal mode operation. In the following steps, the display will go back to “OCP TRIPPED” if you let the display time out after about several seconds.

OCP annunciator flashes. When it was caused by external

Display Limit

Over Current

• Adjust output current level

1 Lower the output current level.

Display

Press key and set the knob for current control by pressing key,

Limit

Volt ag e Current

then lower the output current level below the OCP trip point.

2 Move to the clear mode.

OCP

OCP CLEAR

OCPOCP

Over

Press key twice to move to the OCP CLEAR mode. The “OCP ON”

Current

message appears on the display. Turn the knob to the right until the above message appears on the display.

Over Current

Chapter 2 Quick Start

To Program Overcurrent Protection

3 Clear the overcurrent condition and exit this menu.

Now, when you press key again, the “DONE’’ message is displayed for a second and the

Over Current

OCP annunciator will not blink any more. The output will

return to meter mode. The knob is selected for current control.

Notice that the power supply is operated in the constant current (CC) mode.

• Adjust OCP trip level

1 Raise the OCP trip level.

Over

Press key and turn the knob to raise the OCP trip level.

Current

2 Move to the OCP CLEAR mode.

OCP

OCP CLEAR

OCPOCP

Over Current

Press the ke y to move to the OCP CLEA R mode. The “OCP ON” me ssage

Over Current

appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overcurrent condition and exit this menu.

Now, when you press key again, the “DONE’’ message is displayed for

Over Current

a second and the OCP annunciator will not blink any more. The output will return to the meter mode.

Chapter 2

Quick Start

To Rack Mount the Power Supply

The power supply can be mounted in a standard 19-inch rack cabinet using one of three optional kits available. A rack-mounting kit for a single instrument is available as Option 1CM (P/N 5063-9243). Installation instructions and hardware are included with each rack-mounting kit. Any Agilent System II instrument of the same size can be rack-mounted beside the Agilent E3633A or E3634A DC power supply.

Remove the front and rear bumpers before rack-mounting the power supply.

To remove the rubber bumper, stretch a corner and then slide it off.

To rack mount a single instrument, order adapter kit 5063-9243.

Chapter 2

Quick Start

To Rack Mount the Power Supply

To rack mount two instruments of the same depth side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9214.

To install two instruments in a sliding support shelf, order support shelf 5063-9256, and slide kit 1494-0015.

Chapter 2 Quick Start

To Rack Mount the Power Supply

Calibration Procedures

This chapter contains procedures for verification of the power supply’s performance and calibration (adjustment). The chapter is divided into the following sections:

• Agilent Technologies Calibration Services, on page 45

• Calibration Interval, on page 45

• Automating Calibration Procedures, on page 46

• Test Considerations, on page 46

• Recommended Test Equipment, on page 47

• Performance Verification Tests, on page 48

• Measurement Techniques, starting on page 49

• Constant Voltage (CV) Verifications, starting on page 51

• Constant Current (CC) Verifications, starting on page 56

• Common Mode Current Noise, on page 59

• Performance Test Record for Agilent E3633A/E3634A, on page 60

• Calibration Security Code, starting on page 61

• Calibration Count, on page 64

• Calibration Message, on page 64

• General Calibration/Adjustment Procedure, starting on page 65

• Aborting a Calibration in Progress, on page 71

• Calibration Record for Agilent E3633A/E3634A, on page 72

• Error Messages, starting on page 73

• An Example Program of Excel 97 for Calibration, starting on page 75

The performance verification tests for constant voltage (CV) and constant current (CC) operations use the power supply’s specifications listed in chapter 1, ‘‘Specifications,’’ starting on page 13.

Chapter 3 Calibration Procedures

Agilent Technologies Calibration Services

Note If you calibrate the power supply over the remote interface, you must send the *RST

command to the power supply or turn the power supply off and on again after performing a calibration to ensure proper power supply operation.

Closed-Case Electronic Calibration The power supply features closedcase electronic calibration since no internal mechanical adjustments are required for normal calibration. The power supply calculates correction factors based upon the input reference value you enter. The new correction factors are stored in non-volatile memory until the next calibration adjustment is performed. (Non-volatile memory does not change when power has been off or after a remote interface reset.)

Agilent Technologies Calibration Services

When your power supply is due for calibration, contact your local Agilent Technologies Service Center for a low-cost calibration. The Agilent E3633A and E3634A power supplies are supported on calibration processes which allow Agilent Technologies to provide this service at competitive prices.

Calibration Interval

The power supply should be calibrated on a regular interval determined by the accuracy requirements of your application. A 1-year interval is adequate for most applications. Agilent Technologies does not recommend extending calibration intervals beyond 1 year for any application. Agilent Technologies recommends that complete re-adjustment should always be performed at the calibration interval. This will increase your confidence that the Agilent E3633A and E3634A will remain within specification for the next calibration interval. This criteria for re-adjustment provides the best long-term stability.

Chapter 3 Calibration Procedures

Automating Calibration Procedures

You can automate the complete verification procedures outlined in this chapter if you have access to programmable test equipment. You can program the instrument configurations specified for each test over the remote interface. You can then enter readback verification data into a test program and compare the results to the appropriate test limit values.

You can also enter calibration constants from the remote interface. Remote operation is similar to the local front-panel procedure. You can use a computer to perform the adjustment by first selecting the required setup. The calibration value is sent to the power supply and then the calibration is initiated over the remote interface. The power supply must be unsecured prior to initiating the calibration procedure. An example program of Excel 97 for calibration over the GPIB interface is listed at the end of this chapter.

For further details on programming the power supply, see chapters 3 and 4 in the Agilent E3633A and E3634A User’s Guide.

Test Considerations

To ensure proper instrument operation, verify that you have selected the correct power-line voltage prior to attempting any test procedure in this chapter. See page 24 in chapter 2 for more information.

Ensure that all connections of terminals (both front panel and rear panel) are removed while the power supply internal self-test is being performed.

For optimum performance verification, all test procedures should comply with the following recommendations:

• Assure that the calibration ambient temperature is stable and between 20°C and 30°C.

• Assure ambient relative humidity is less than 80%.

• Allow a 1-hour warm-up period before verification or calibration.

• Use short cables to connect test set-ups.

Caution The tests should be performed by qualified personnel. During performance

verification tests, hazardous voltages may be present at the outputs of the power supply.

Chapter 3 Calibration Procedures

Recommended Test Equipment

The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, use the accuracy requirements shown to select substitute calibration standards. If you use equipment other than that recommended in Table 3-1, you must recalculate the measurement uncertainties for the actual equipment used.

Table 3-1. Recommended Test Equipment

Instrument Requirements Recommended

GPIB controller Full GPIB or RS-232 capabilities Agilent 82341C

Oscilloscope 100 MHz with 20 MHz bandwidth Agilent 54602B Display transient response

RMS Voltmeter 20 Hz to 20 MHz Measure rms ripple & noise

Coaxial cable Agilent 10502A Measure rms ripple & noise

BNC female to banana plug adapter

Digital Voltmeter Resolution: 0.1 mV

Accuracy: 0.01%

Electronic Load Voltage Range: 60 Vdc

Current Range: 60 Adc

Open and Short Switches

Transient On/Off

(0.4

Resistive Loads

)

Current monitoring Resistor (Shunt)

9, 300 W/2.0 9, 300 W)* Measure ripple and noise

(3.5 9, 300 W/12.5 9, 300 W)**

(0.01

9, 0.01%)

[1]

Model

interface card

Agilent 1251-2277 Measure rms ripple & noise

Agilent 34401A Measure dc voltages

Agilent 60502B Measure load and line

ISOTEK Co.

Model: A-H

Programming and readback accuracy

and ripple & noise waveform

regulations and transient response time.

Constant current test setup

Use

[1]

It is recommended to use a current monitoring resistor after calibration to

find the accurate resistance.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Performance Verification Tests

The performance verification tests use the power supply’s specifications listed in chapter 1, ‘‘Specifications’’, starting on page 13.

You can perform two different levels of performance verification tests:

• Self-Test A series of internal verification tests that provide high confidence that the power supply is operational.

• Performance Verification Tests These tests are used to verify that the power supply is operating as specified in the performance specifications.

Self-Test

A power-on self-test occurs automatically when you turn on the power supply. This limited test assures you that the power supply is operational.

The complete self-test is enabled by holding down key (actually any front panel keys except key) as you turn on the power supply and hold down

Error

the key until you hear a long beep. The self-test will begin when you release the key following the beep. The complete self-test takes approximately two seconds to execute.

You can also perform a self-test from the remote interface (see chapter 3 in the Agilent E3633A and E3634A User’s Guide).

• If the self-test is successful, ‘‘PASS’’ is displayed on the front panel.

• If the self-test fails, ‘‘FAIL’’ is displayed and the on. If repair is required, see chapter 5, ‘‘Service’’, for further details.

• If self-test passes, you have a high confidence that the power supply is operational.

Recall

ERROR annunciator turns

Performance Verification Tests

These tests should be used to verify the power supply’s specifications following repairs to specific circuits. The following sections explain all verification procedures in detail. All of the performance test limits are shown in each test.

Chapter 3 Calibration Procedures

Measurement Techniques

Setup for Most Tests

Most tests are performed at the front terminals as shown in the following figure. Measure the dc voltage directly at the (+) and (-) terminals on the front panel.

Figure 3-1. Performance Verification Test Setup

Electronic Load

Many of the test procedures requ ire the use of a var iable load resistor c apab le of dissipating the required power. Using a variable load resistor requires that switches should be used to connect, disconnect, and short the load resistor. An electronic load, if available, can be used in place of a variable load resistor and switches. The electronic load is considerably easier to use than load resistors. It eliminates the need for connecting resistors or rheostats in parallel to handle power, it is much more stable than carbon-pile load, and it makes easy work of switching between load conditions as is required for the load regulation and load response tests. Substitution of the electronic load requires minor changes to the test procedures in this chapter.

Chapter 3 Calibration Procedures

Measurement Techniques

General Measurement Techniques

To achieve best results when measuring load regulation, peak to peak voltage, and transient response time of the power supply, measuring devices must be connected through the hole in the neck of the binding post at (A) while the load resistor is plugged into the front of the output terminals at (B). A measurement made across the load includes the impedance of the leads to the load. The impedance of the load leads can easily be several orders of the magnitude greater than the power supply impedance and thus invalidate the measurement. To avoid mutual coupling effects, each measuring device must be connected directly to the output terminals by separate pairs of leads.

Figure 3-2. Front Panel Terminal Connections (Side View)

Current-Monitoring Resistor

To eliminate output current measurement error caused by the voltage drops in the leads and connections, connect the current monitoring resistor between the (-) output terminal and the load as a four-terminal device. Connect the current-monitoring leads inside the load-lead connections directly at the monitoring points on the resistor element (see R

in Figure 3-1).

Programming

Most performance tests can be performed from the front panel. However, an GPIB or RS-232 controller is required to perform the voltage and current programming accuracy and readback accuracy tests.

The test procedures are written assuming that you know how to program the power supply either from the front panel or from an GPIB or RS-232 controller. Complete instructions on front panel and remote programming are given in the Agilent E3633A and E3634A User’s Guide.

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

Constant Voltage Test Setup

If more than one meter or if a meter and an oscilloscope are used, connect each to the (+) and (-) terminals by a separate pair of leads to avoid mutual coupling effects. Use coaxial cable or shielded 2-wire cable to avoid noise pickup on the test leads.

Voltage Programming and Readback Accuracy

This test verifies that the voltage programming and GPIB or RS-232 readback functions are within specifications. Note that the readback values over the remote interface should be identical to those displayed on the front panel.

You should program the power supply over the remote interface for this test to avoid round off errors.

1 Turn off the power supply and connect a digital voltmeter between the (+) and

(-) terminals of the output to be tested as shown in Figure 3-1.

2 Turn on the power supply. Select the 20V/10A* or 50V/4A** range and enable

the output by sending the commands:

VOLT:RANG P20V (E3633A)

VOLT:RANG P50V (E3634A)

OUTP ON

3 Program the output voltage to zero volt and current to full rated value

(10.0 A)* or (4.0 A)** by sending the commands:

VOLT 0

CURR 10 (E3633A)

CURR 4 (E3634A)

4 Record the ou tput voltage r eading o n the digital v oltmeter (DVM) . The reading

should be within the limit of (0 V ± 10 mV). Also, note that the

Rmt annunciators are on.

and

5 Readback the output voltage over the remote interface by sending the

command:

MEAS:VOLT?

6 Record the value displayed on the controller. This value should be within the

limit of (DVM ±5 mV).

CV, Adrs, Limit,

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

7 Program the output voltage to full rated value (20.0 V)* or (50.0 V)** by sending

the command:

VOLT 20.0 (E3633A)

VOLT 50.0 (E3634A)

8 Record the ou tput voltage r eading o n the digital v oltmeter (DVM) . The reading

should be within the limit of (20 V ± 20 mV)* or (50 V ± 35mV)**.

9 Readback the output voltage over the remote interface by sending the

command:

MEAS:VOLT?

10 Record the value displayed on the controller. This value should be within the

limit of (DVM ± 15 mV)* or (DVM ± 30 mV)**.

CV Load Effect (Load Regulation)

This test measures the change in the output voltage resulting from a change in the output current from full to no load.

1 Turn off the power supply and connect a digital voltmeter between the (+) and

(-) terminals of the output as shown in Figure 3-1.

2 Turn on the power supply. Select the 20V/10A* or 50V/4A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the output current to the full rated value (10.0 A)* or (4.0 A)** and the voltage to the full rated value (20.0 V)* or (50.0 V)**.

3 Operate the electronic load in constant current mode and set its current to

(10.0 A)* or (4.0 A)**. Check that the front panel If not lit, adjust the load so that the output current drops slightly until the annunciator lights. Record the output voltage reading on the digital voltmeter.

4 Operate the electronic load in open mode (input off). Record the output voltage

reading on the digital voltmeter again. The difference between the digital voltmeter readings in steps (3) and (4) is the CV load regulation. The difference of the readings should be within the limit of (4 mV)* or (7 mV)**.

CV annunciator remains lit.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

CV Source effect (Line Regulation)

This test measures the change in output voltage that results from a change in ac line voltage from the minimum value (10% below the nominal input voltage) to maximum value (10% above the nominal input voltage).

1 Turn off the power supply and connect a digital voltmeter between the (+) and

(-) terminals of the output to be tested as shown in Figure 3-1.

2 Connect the ac power line through a variable voltage transformer.

3 Turn on the power supply. Select the 20V/10A* or 50V/4A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the current to the full rated value (10.0 A)* or (4.0 A)** and the voltage to full rated value (20.0 V)* or (50.0 V)**.

4 Operate the electronic load in constant current mode and set its current to

(10.0 A)* or (4.0 A)**. Check that the adjust the load so that the output current drops slightly until the annunciator lights.

5 Adjust the transformer to low line voltage limit (104 Vac for nominal 115 Vac,

90 Vac for nominal 100 Vac, or 207 Vac for nominal 230 Vac). Record the output reading on the digital voltmeter.

6 Adjust the transformer to high line voltage (127 Vac for nominal 115 Vac, 110

Vac for nominal 100 Vac, or 253 Vac for nominal 230 Vac). Record the voltage reading on the digital voltmeter. The difference between the digital voltmeter readings in steps (5) and (6) is the CV line regulation. The difference of the readings should be within the limit of (4 mV)* or (7 mV)**.

CV annunciator remains lit. If not lit,

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

CV PARD (Ripple and Noise)

Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage superimposed on the dc output voltage. CV PARD is specified as the rms or peak-to-peak output voltage in the frequency range from 20 Hz to 20 Mhz.

• VRMS measurement techniques:

When measuring Vrms ripple and noise, the monitoring device should be p lu g ge d i nt o th e fr on t of th e te rm i na ls a t ( B) in F i gu r e 3 -2 . Us e t h e c oa xi a l c ab le and BNC female to banana plug adapter to connect the monitor device to the power supply. To reduce the measurement error caused by common mode noise, it is recommended that you use a common mode choke between the cable and the BNC adapter. The common mode choke is constructed by inserting coaxial cable into Ferrite Toroidal core. The load resistor should be connected to the terminal at (A) in Figure 3-2. Twisted leads between the load resistor and the power supply helps reduce noise pickup for these measurements.

1 Turn off the power supply and connect the output to be tested as shown in

Figure 3-1 to an oscilloscope (ac coupled) between (+) and (-) terminals. Set the oscilloscope to AC mode and bandwidth limit to 20 MHz. Connect a resistive load (2.0

2 Turn on the power supply. Select the 20V/10A* or 50V/4A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the current to the full rated value (10.0 A)* or (4.0 A)** and the voltage to the full rated value (20.0 V)* or (50.0 V)**.

3 Check that the front panel

down slightly.

4 Note that the waveform on the oscilloscope does not exceed the peak-to-peak

limit of 3 mV.

5 Disconnect the oscilloscope and connect the ac rms voltmeter in its place

according to the VRMS measurement techniques above. The rms voltage reading does not exceed the rms limit of 0.35 mV* or 0.5 mV**.

)* or (12.5 )** to the terminal at (A) in Figure 3-2.

CV annunciator remains lit. If not lit, adjust the load

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Voltage (CV) Verifications

Load Transient Response Time

This test measures the time for the output voltage to recover to within 15 mV of nominal output voltage following a load change from full load to half load, or half load to full load.

1 Turn off the power supply and connect the output to be tested as shown in

Figure 3-1 with an oscilloscope. Operate the electronic load in constant current mode.

2 Turn on the power supply. Select 20V/10A* or 50V/4A** range, enable the

3 Set the electronic load to transient operation mode between one half of the

output’s full rated value and the output’s full rated value at a 1 kHz rate with 50% duty cycle.

4 Set the oscilloscope for ac coupling, internal sync, and lock on either the

positive or negative load transient.

5 Adjust the oscilloscope to display transients as shown in Figure 3-3. Note that

the pulse width (t2 - t1) of the transients at 15 mV from the base line is no more than 50

msec for the output.

Figure 3-3. Transient Response Time

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Current (CC) Verifications

Constant Current Test Setup

Follow the general setup instructions in the ‘‘Measurement Techniques’’ section, starting on page 50 and the specific instructions will be given in the following paragraphs.

Current Programming and Readback Accuracy

This test verifies that the current programming and GPIB or RS-232 readback functions are within specifications. Note that the readback values over the remote interface should be identical to those displayed on the front panel. The accuracy of the current monitoring resistor must be 0.01% or better.

You should program the power supply over the remote interface for this test to avoid round off errors.

1 Turn off the power supply and connect a 0.01

) across the output to be tested and a digital voltmeter across the current

monitoring resistor (R

2 Turn on the power supply. Select the 8V/20A* or 25V/7A** range and enable

the output by sending the commands:

VOLT:RANG P8V (E3633A)

VOLT:RANG P25V (E3634A)

OUTP ON

3 Program the output voltage to full rated voltage (8.0 V)* or (25.0 V)** and

output current to zero amps by sending the commands:

VOLT 8 (E3633A)

VOLT 25 (E3634A)

CURR 0

4 Divide the voltage drop (DVM reading) across the current monitoring resistor

) by its resistance to convert to amps and record this value (IO). This value

should be within the limit of (0 A ± 10 mA). Also, note that the

Rmt annunciators are on.

and

5 Readback the output current over the remote interface by sending the

command:

MEAS:CURR?

 current monitoring resistor

CC, Adrs, Limit,

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Current (CC) Verifications

6 Record the value displayed on the controller. This value should be within the

limit of (I

7 Program the output current to the full rated value (20.0 A)* or (7.0 A)** by

sending the command:

CURR 20.0 (E3633A)

CURR 7.0 (E3634A)

8 Divide the voltage drop (DVM reading) across the current monitoring resistor

should be within the limit of (20 A ± 50 mA)* or (7A ± 24 mA)**.

9 Readback the output current over the remote interface by sending the

command:

MEAS:CURR?

10 Record the value displayed on the controller. This value should be within the

limit of (I

± 5 mA).

) by its resistance to convert to amps and record this value (IO). This value

± 35 mA)* or (IO ± 15.5 mA)**.

CC Load Effect (Load Regulation)

Th is test m e asures th e change in ou tput curr ent r e sulti ng fr om a change in th e load from full rated output voltage to short circuit.

1 Turn off the power supply and connect the output to tested as shown in

Figure 3-1 with the digital voltmeter connected across the 0.01 monitoring resistor (R

2 Turn on the power supply. Select the 8V/20A* or 25V/7A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the output voltage to the full rated value (8.0 V)* or (25.0 V)** and the output current to the full rated value (20.0 A)* or (7.0 A)**.

3 Set the voltage of the electronic load to (6.0 V)* or (23.0 V)** to operate it in

constant voltage mode since a voltage drop occurs on the load wires when (20.0 A)* or (7.0 A)** flows on the load wires. Check that the i s o n. If it i s n o t, ad ju st th e l oa d so th at th e o u tp u t v ol ta g e d ro ps s li gh tl y. Re c or d the current reading by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor.

4 Operate the electronic load in short (input short) mode. Record the current

reading again by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor. The difference between the current readings in step (3) and (4) is the load regulation current. The difference of the readings should be within the limit of (2.25 mA)* or (0.95 mA)**.

 current

CC annunciator

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Constant Current (CC) Verifications

CC Source Effect (Line Regulation)

This test measures the change in output current that results from a change in ac line voltage from the minimum value (10% below the nominal input voltage) to the maximum value (10% above nominal voltage).

1 Turn off the power supply and connect the output to be tested as shown in

Figure 3-1 with the digital voltmeter connected across the current monitoring resistor (R

2 Connect the ac power line through a variable voltage transformer.

3 Turn on the power supply. Select the 8V/20A* or 25V/7A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the voltage to the full rated value (8.0 V)* or (25.0 V)** and the current to the full rated value (20.0 A)* or (7.0 A)**.

4 Operate the electronic load in constant voltage mode and set its voltage to

(8.0 V)* or (25.0 V)**. Check that the adjust the load so that the output voltage drops slightly until the annunciator lights.

5 Adjust the transformer to low line voltage limit (104 Vac for nominal 115 Vac,

90 Vac for nominal 100 Vac, or 207 Vac for nominal 230 Vac). Record the output current reading by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor.

6 Adjust the transformer to 10% above the nominal line voltage (127 Vac for a

115 Vac nominal input, 110 Vac for a 100 Vac nominal input or 253 Vac for a 230 Vac nominal input). Record the current reading again by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor. The difference between the current readings in step (5) and (6) is the load regulation current. The difference of the readings should be within the limit of (2.25 mA)* or (0.95 mA)**.

CC annunciator remains lit. If not lit,

CC PARD (Ripple and Noise)

Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac current, as well, as an ac voltage superimposed on the dc output. CC PARD is specified as the rms output current in a fr eq ue nc y ra ng e 2 0 H z t o 2 0 M Hz wi th th e p ow er su pply in co ns ta nt cu rr ent operation.

1 Turn off the power supply and connect the output to be tested as shown in

Figure 3-1 with a load resistor (0.4 Connect a rms voltmeter across the current monitoring resistor 0.01 only a resistive load for this test.

*For Agilent E3633A Model **For Agilent E3634A Model

)* or (3.5 )** across output terminals.

. Use

Chapter 3 Calibration Procedures

Common Mode Current Noise

2 Turn on the power supply. Select the 8V/20A* or 25V/7A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the current to full rated value (20.0 A)* or (7.0 A)** and the voltage to the full rated value (8.0 V)* or (25.0 V)**.

3 The output current should be at the full rated rating with the CC annunciator

on. If not lit, adjust the load so that the output voltage drops slightly until the

CC annunciator lights.

4 Divide the reading on the rms voltmeter by the load resistance to obtain rms

current. The readings should be within the limit of 2 mA.

Common Mode Current Noise

The common mode current is that ac current component which exists between the output or output lines and chassis ground. Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground. When a circuit is referenced to earth ground, a low level line-related ac current will flow from the output terminals to earth ground. Any impedance to earth ground will create a voltage drop equal to the output current flow multiplied by the impedance.

1 Turn off the power supply and connect a 100 k

capacitor in parallel between the (-) terminal and chassis ground.

2 Connect a digital voltmeter across R

3 Turn on the power supply. Select the 8V/20A* or 25V/7A** range, enable the

output, and set the display to the limit mode. When the display is in the limit mode, program the output to the full rated value (8.0 V and 20.0 A)* or (25.0 V and 7.0 A)**.

4 Record the voltage across R

resistance (DVM reading/100 k

and convert it to current by dividing by the

). Note that the current is less than 1.5 A.

 resistor (R

) and a 2200 pF

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Calibration Procedures

Performance Test Record for Agilent E3633A and E3634A

CV Performance Test Record

Test Description Models Actual Result

CV Programming Accuracy @ 0 volts (DVM reading)

CV Readback Accuracy @ 0 volts both DVM + 0.0050 V DVM - 0.0050 V

CV Programming Accuracy @ Full Scale (DVM reading)

CV Readback Accuracy @ Full Scale (E3633A) DVM + 0.0150 V DVM - 0.0150 V

CV Load Effect (Load Regulation) Maximum change: < (4 mV)* or (7 mV)**

CV Source Effect (Line Regulation) Maximum change: < (4 mV)* or (7 mV)**

CV PARD (Normal mode) < 3 mV p-p, (350 mV)* or (500 mV)** rms

Load Transient Response Time both < 50 msec

both +0.0100 V -0.0100 V

(E3633A) +20.0200 V 19.9800 V

(E3634A) +50.0350 V 49.9650 V

(E3634A) DVM + 0.0300 V DVM - 0.0300 V

Upper Limit Lower Limit

Specifications

CC Performance Test Record

Test Description Models Actual Result

CC Programming Accuracy @ 0 amps (I

CC Readback Accuracy @ 0 amps both I

CC Programming Accuracy @ Full Scale (I

CC Readback Accuracy @ Full Scale (E3633A) I

CC Load Effect (Load Regulation) Maximum change: < (2.25 mA)* or (0.95 mA)**

CC Source Effect (Line Regulation) Maximum change: < (2.25 mA)* or (0.95 mA)**

CC PARD (Normal mode) both < 2 mA rms

CC PARD (Common mode) both < 1.5 mA rms

)

*For Agilent E3633A Model **For Agilent E3634A Model

both +0.0100 A -0.0100 A

(E3633A) 20.0500 A 19.9500 A

(E3634A) 7.0230 A 6.9770 A

(E3634A) I

Upper Limit Lower Limit

+ 0.0050 A IO - 0.0050 A

+ 0.0350 A IO - 0.0350 A

+ 0.0155 A IO - 0.0155 A

Specifications

Chapter 3 Calibration Procedures

Calibration Security Code

This feature allows you to enter a security code (electronic key) to prevent accidental or unauthorized calibrations of the power supply. When you first receive your power supply, it is secured. Before you can calibrate the power supply, you must unsecure it by entering the correct security code. A procedure to unsecure the power supply is given on the following page.

• The security code is set to ‘‘HP003633’’* or ‘‘HP003634’’** when the power supply is shipped from the factory. The security code is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset.

• To secure the power supply from the remote interface, the security code may contain up to 12 alphanumeric characters as shown below. The first character must be a letter, but the remaining characters can be letters or numbers. You do not have to use all 12 characters but the first character must always be a letter.

A _ _ _ _ _ _ _ _ _ _ _ (12 characters)

• To secure the power supply from the remote interface so that it can be unsecured from the front panel, use the eight-character format shown below. The first two characters must be ‘‘H P’’ and the remaining characters must be numbers. Only the last six characters are recognized from the front panel, but all eight characters are required. To unsecure the power supply

from the front panel, omit the ‘‘HP’’ and enter the remaining numbers as shown on the following pages.

HP _ _ _ _ _ _ (8 characters)

• If you forget your security code, you can disable the security feature by adding a jumper inside the power supply, and then entering a new code.

See the procedure on page 63.

*For Agilent E3633A Model **For Agilent E3634A Model

Error

Calibrate

Chapter 3 Calibration Procedures

Calibration Security Code

To Unsecure the Power Supply for Calibration

The power supply can use a calibration security code to prevent unauthorized or accidental calibration. This procedure shows you how to unsecure the power supply for calibration from the front panel.

1 Turn on the front-panel calibration mode.

SECURED

I/O

Config

Secure

Turn on the calibration mode by holding down (Calibrate) key as you

Error

Calibrate

turn on the power supply and hold down the key until you hear a long beep.

If the power supply is secured, you will see the above message from the front panel for approximately one second. The ‘‘CAL MODE’’ message is then displayed on the front panel.

I/O

2 Move to the security code by pressing (Secure) key.

Config

Secure

000000000 CODE

3 Enter the security code using the knob and resolution selection keys.

003633 CODE

003634 CODE

The security code is set to ‘‘HP003633’’* or ‘‘HP003634’’** when the power supply is shipped from the factory. The security code is stored in non-volatile memory and does not change when the power has been off or after a remote interface reset.

• To enter the security code from the front panel, enter only the last six digits.

• To enter the security code from the remote interface, you may enter up to 12 characters.

Use the resolution selection keys to move left or right between digits. Use the knob to change the digits. Notice that the security code may be different if the security code has been changed from the default setting.

(E3633A)

(E3634A)

*For Agilent E3633A Model **For Agilent E3634A Model

I/O

Config

Secure

Power

Chapter 3 Calibration Procedures

Calibration Security Code

4 Unsecure the power supply.

UNSECURED

I/O

The power supply is unsecured when you press (Secure) key. You will

Config

Secure

se e the above message from th e front pa nel f or one seco nd. T h e ‘‘CAL MOD E ’’ message is displayed on the front panel after above message.

5 Turn off the calibration mode.

Turn off the power supply to exit the calibration mode.

To re-secure the power supply (following calibration), perform this procedure again.

To Unsecure the Power Supply Without the Security Code

To unsecure the power supply without the correct security code (when you forget the security code), follow the steps below. See ‘‘Electrostatic Discharge (ESD) Precautions’’ in chapter 5 before beginning this procedure.

1 Disconnect the power cord and all load connections from the power supply.

2 Remove the instrument cover. Refer to the disassembly drawing on page 127.

3 Connect the power cord and turn on the calibration mode by holding down

Error

(Calibrate) key as you turn on the power supply and hold down the key

Calibrate

until you hear a long beep. Be careful not to touch the power line connections.

4 Apply a short between the two exposed metal pads on JP5 (located near U13).

The JP5 is outlined with a circle on the component locator drawing on page 128.

5 While maintainin g the short, move to the security c ode and e nter any un secure

code in the calibration mode. The power supply is now unsecured.

6 Remove the short at JP5. (An error occurs if not removed.)

7 Turn off and reassemble the power supply.

Now you can enter a new security code. Be sure you take note of the new security code.

Chapter 3 Calibration Procedures

Calibration Count

The calibration count feature provides an independent ‘‘serialization’’ of your calibrations. You can determine the number of times that your power supply has been calibrated. By monitoring the calibration count, you can determine whether an unauthorized calibration has been performed. Since the value increments by one for each calibration parameter (see Table 3-2 on the next page), a complete calibration increases the value by 5 counts.

• The calibration count is stored in non-volatile memory and does not change when power has been off or after a remote interface reset. Your power supply was calibrated before it left the factory. When you receive the power supply, read the calibration count to determine its value.

• The calibration count increments up to a maximum of 32,767 after which it wraps around to 0. No way is provided to program or reset the calibration count.

Calibration Message

You can use the calibration message feature to record calibration information about your power supply. For example, you can store such information as the last calibration date, the next calibration due date, the power supply’s serial number, or even the name and phone number of the person to contact for a new calibration.

You can record and read information in the calibration message from the remote interface only.

• The calibration message may contain up to 40 characters.

• The calibration message is stored in non-volatile memory and does not change when power has been off or after a remote interface reset.

• Remote Interface Operation

CAL:SEC:STAT {OFF|ON},

CAL:SEC:CODE

CAL:STR

CAL:STR?

See “Calibration Overview”, starting on page 68 in chapter 3 of the User’s Guide for more details.

<new code> Change the security code

<quoted string> Store the calibration message

<code> Secure or unsecure the power supply

Query the calibration information

Chapter 3 Calibration Procedures

General Calibration/Adjustment Procedure

The calibration procedures from the front panel are described in this section. For voltage calibration, disconnect all loads from the power supply and connect a DVM across the output terminals. For current calibration, disconnect all loads from the power supply, connect an appropriate current monitoring resistor 0.01 across the terminals of the monitoring resistor.

Note that the power supply should be calibrated after 1-hour warm-up with no load connected.

The following table shows calibration parameters and points which should be used to calibrate the output voltage and current.

Table 3-2. Parameters for Calibration

Calibration

Parameter

CAL SETUP 1 Voltage

CAL SETUP 2 OVP None

CAL SETUP 3 Current

CAL SETUP 4 OCP None

9 across the output terminals, and connect a DVM

Voltage/

Current

Calibration Point

mnemonic

V LO

V MI

V HI

I LO

I MI

I HI

Note You can terminate any CAL SETUP without changing its calibration constants by

turning off power.

Note Perform the voltage calibration prior to the OVP calibration and the current

calibration prior to the OCP calibration.

Error

Calibrate

Chapter 3 Calibration Procedures

General Calibration/Adjustment Procedure

Front Panel Voltage and Current Calibration

1 Unsecure the power supply.

To calibrate the voltage and current, you must unsecure the power supply according to the procedure given on page 62.

2 Disconnect all loads from the power supply and connect a DVM across

output terminals.

3 Turn on the calibration mode.

CAL MODE

Error

Calibrate

Error

Calibrate

Turn on the calibration mode by holding down (Calibrate) key as you

Error

Calibrate

turn on the power supply and hold down the key until you hear a long beep. Make sure that the power supply is in ‘‘CV’’ mode. If the power supply is not in ‘‘CV’’ mode, an error occurs.

Voltage and OVP Calibration

4 Move down a level to the voltage calibration mode.

CAL SETUP 1

The display shows the above message to indicate that the power supply is ready for voltage calibration.

5 Calibrate DAC and select the low voltage calibration point.

30 LEFT

The ‘‘START BITCAL’’ message is displayed for about 3 seconds to indicate that the power supply is ready for DAC calibration. Then it counts down numbers from 30 to 0.

V LO 0.5555000 V

Then, the display shows the low voltage calibration point.

Chapter 3 Calibration Procedures

General Calibration/Adjustment Procedure

6 Read the DVM and change the low voltage value on the display to match

the measured voltage.

For example, if the DVM reading is 0.4500 V, adjust the voltage to 0.4500 V using the knob and resolution selection keys.

V LO 0.4500 V

Error

Calibrate

Error

Calibrate

7 Pressing (Calibrate) key saves the change and selects the middle

Error

Calibrate

voltage calibration point. (‘‘V MI 25.000V’’ - E3634A model)

V MI 10000.000 V (E3633A)

If th e entered number is within an acceptabl e range, a n ‘‘E NTERED’’ message appears for one second. If the entered number is not correct, an ‘‘MIN VALUE’’ or ‘‘MAX VALUE’’ message appears for one second and the display shows the low voltage calibration point again. The display now shows the middle voltage calibration point.

8 Read the DVM and change the middle voltage value on the display to

match the measured voltage.

For example, if the DVM reads 10.001 V, adjust the voltage to 10.001 V using the knob and arrow keys.

V MI 10.001 V

9 Pressing (Calibrate) key saves the changes and selects the high

voltage calibration point. (‘‘V HI 49.500 V’’ - E3634A model)

Error

Calibrate

V HI 19999.500 V (E3633A)

If th e entered number is within an acceptabl e range, a n ‘‘E NTERED’’ message appears for one second. If the entered number is not correct, an ‘‘MIN VALUE’’ or ‘‘MAX VALUE’’ message appears for one second and the display shows the middle voltage calibration point again. The display now shows the high voltage calibration point.

Chapter 3 Calibration Procedures

General Calibration/Adjustment Procedure

10 Read the DVM and change the high voltage value on the display to match

the measured voltage.

For example, if the DVM reads 19.495 V, adjust the voltage to 19.495 V using the knob and arrow keys.

V HI 19.495 V

Error

Calibrate

Error

Calibrate

11 Pressing (Calibrate) key saves the new voltage calibration

Error

Calibrate

constants, and goes to the OVP calibration mode.

CAL SETUP 2

A ‘‘CALIBRATING’’ message appears for one second to indicate that the voltage calibration is progressing and new voltage calibration constants of ‘‘SETUP 1’’ are stored. Then, the display shows above message to indicate that the power supply is ready for the OVP calibration.

If th e c al ib ra tion fa il s, a ‘ ‘D AC C AL FAI L’’ or ‘‘ AD C CA L FA IL’ ’ m es sa ge app ea rs for one second and the display shows the ‘‘CAL SETUP 1’’ for voltage calibration again.

Current and OCP Calibration

12 Pressing (Calibrate) key saves the new calibration constants for

Error

Calibrate

OVP circuit and goes to the current calibration mode.

CAL SETUP 3

A ‘‘CALIBRATING’’ message appears for about several seconds to indicate that the OVP calibration is progressing and new calibration constants of ‘‘SETUP 2’’ are stored. Then, the display shows the above message to indicate that the power supply is ready for the current calibration.

Connect an appropriate shunt 0.01 9 across the output terminals, and connect a digital voltmeter across the shunt resistor for the current calibration.

Error

Calibrate

Chapter 3 Calibration Procedures

General Calibration/Adjustment Procedure

If the calib ration fa ils, a ‘‘ OVP CAL FAIL’’ mess age appea rs fo r one secon d and the display shows the ‘‘CAL SETUP 2’’ for OVP calibration again.

13 Select the low current calibration point.

(‘‘I LO 0.200 A’’ - E3634A model)

I LO 0.500 A (E3633A)

The display shows the low current calibration point.

Error

Calibrate

14 Read the DVM and change the low current value on the display to match

the computed current (DVM reading

 by shunt resistance).

For example, if the computed value is 0.499 A, adjust the current to 0.499 A using the knob and arrow keys.

Notice that you should wait for the DVM reading to stabilize for accurate calibration.

I LO 0.499 A

15 Pressing the ‘‘Calibrate’’ key saves the change and selects the middle

current calibration point. (‘‘I MI 3.500 A’’ - E3634A model)

I MI 10.000 A (E3633A)

If th e entered number is within an acceptabl e range, a n ‘‘E NTERED’’ message appears for one second. If the entered number is not correct, an ‘‘MIN VALUE’’ or ‘‘MAX VALUE’’ message appears for one second and the display shows the low current calibration point again. The display now shows the middle current calibration point.

16 Read the DVM and change the middle current value on the display to

match the computed current (DVM reading

For example, if the computed value is 9.999 A, adjust the current to 9.999 A using the knob and arrow keys.

Notice that you should wait for the DVM reading to stabilize for accurate calibration.

by shunt resistance).

I MI 9.999 A

Error

Calibrate

Chapter 3 Calibration Procedures

General Calibration/Adjustment Procedure

17 Pressing the ‘‘Calibrate’’ key saves the change and selects the high

current calibration point. (‘‘I HI 6.900 A’’ - E3634A model)

I HI 19.500 A (E3633A)

If th e entered number is within an acceptabl e range, a n ‘‘E NTERED’’ message appears for one second. If the entered number is not correct, an ‘‘MIN VALUE’’ or ‘‘MAX VALUE’’ message appears for one second and the display shows the m id dl e c u rr e nt ca li b ra ti on p oi nt ag a in . T he di sp l ay no w s h ow s t he h ig h c ur r en t calibration point

18 Read the DVM and change the high current value on the display to

match the computed current (DVM reading ¸ by shunt resistance).

For example, if the computed value is 19.499 A, adjust the current to 19.499 A using the knob and arrow keys.

Notice that you should wait for the DVM reading to stabilize for accurate calibration.

Error

Calibrate

I HI 19.499 A

19 Pressing the ‘‘Calibrate’’ key saves the new calibration constants for

the output current and goes to the OCP calibration mode.

CAL SETUP 4

A ‘‘CALIBRATING’’ message appears for one second to indicate that the current calibration is progressing and new calibration constants of ‘‘SETUP 3’’ are stored. Then, the display shows the above message to indicate that the power supply is ready for the OCP calibration.

If the calibration fails, an ‘‘DAC CAL FAIL’’ or ‘‘ADC CAL FAIL’’ message appears for one second and the display shows the ‘‘CAL SETUP 3’’ for current calibration again.

Error

Calibrate

Power

Chapter 3 Calibration Procedures

Aborting a Calibration in Progress

20 Pressing the ‘‘Calibrate’’ key saves the new OCP calibration constants

and return to the calibration mode.

CAL MODE

A ‘‘CALIBRATING’’ message appears for several seconds to indicate that the OCP calibration is progressing and new OCP calibration constants of ‘‘SETUP 4’’ are stored. Then the display will return to the calibration mode.

If the calibration fails, a ‘‘OCP CAL FAIL’’ message appears for one second and the display shows the ‘‘CAL SETUP 4’’ for OCP calibration again.

Turn off the power supply to exit the calibration mode.

Aborting a Calibration in Progress

Sometimes it may be necessary to abort a calibration after the procedure has already been initiated. You can abort a calibration at any time by turning the power supply off from the front panel. When performing a calibration from the remote interface, you can abort a calibration by issuing a remote interface device clear message or by pressing the front-panel ‘‘Local’’ key.

Chapter 3 Calibration Procedures

Calibration Record for Agilent E3633A/E3634A

Step Calibration Description

1 Unsecure the power supply (see page 62).

Turn on ‘‘CAL MODE’’ (hold down ‘‘Calibrate’’ and ‘‘Power’’ keys as

you turn on the power supply until you hear a long beeps).

3 Move down menu to ‘‘CAL SETUP 1’’ (press ‘‘Calibrate’’ key). Voltage Calibration

Calibrate DAC and select the low point for voltage calibration; ‘‘START BITCAL’’ appears for about 3 seconds and the display counts down

numbers from 30 to 0. Then, ‘‘V LO 0.5000 V’’ appears on the display (press ‘‘Calibrate’’ key and wait about 30 seconds; then change the display to match the DVM reading).

‘‘V MI 10.000 V’’* or ‘‘V MI 25.000 V’’** appears on the display (press

‘‘Calibrate’’ key; then change the display to match the DVM reading).

‘‘V HI 19.500 V’’* or ‘‘V HI 49.500 V’’** appears on the display (press

‘‘Calibrate’’ key; then change the display to match the DVM reading).

7 ‘‘CAL SETUP 2’’ now appears on the display (press ‘‘Calibrate’’ key). V OVP calibration

‘‘CAL SETUP 3’’ now appears on the display (press ‘‘Calibrate’’ key;

then connect 0.01

‘‘I LO 0.500 A’’* or ‘‘I LO 0.200 A’’** appears on the display (press

‘‘Calibrate’’ key; then change the display to match the computed current through the resistor).

‘‘I MI 10.00 A’’* or ‘‘I MI 3.500 A’’** appears on the display (press

‘‘Calibrate’’ key; then change the display to match the computed current through the resistor).

9 resistor across the output terminals).

Measurement

Mode (DVM)

Supply Being

Adjusted

DAC and low voltage

point calibration

Middle voltage point

calibration

High voltage point

calibration

Current calibration

Low current point

calibration

Middle current point

calibration

‘‘I HI 19.5000 A’’* or ‘‘I HI 6.900 A’’** appears on the display (press

‘‘Calibrate’’ key; then change the display to match the computed current through the resistor).

12 ‘‘CAL SETUP 4’’ now appears on the display (press ‘‘Calibrate’’ key). A OCP calibration

13 Press ‘‘Calibrate’’ key, then press ‘‘Power’’ switch. Exit CAL MODE

*For Agilent E3633A Model **For Agilent E3634A Model

High current point

calibration

Chapter 3 Calibration Procedures

Error Messages

The following tables are abbreviated lists of error messages for the E3633A and E3634A. The errors listed are the most likely errors to be encountered during calibration and adjustment. A more complete list of error messages and descriptions is contained in chapter 5 of the E3633A and E3634A User’s Guide.

System Error Messages

Error Error Messages

-330 Self-test failed

-350 Too many errors

501 Isolator UART framing error

502 Isolator UART overrun error

511 RS-232 framing error

512 RS-232 overrun error

513 RS-232 parity error

514 Command allowed only with RS-232

521 Input buffer overflow

522 Output buffer overflow

550 Command not allowed in local

Self-Test Error Messages

Error Error Messages

601 Front panel does not respond

602 RAM read/write failed

603 A/D sync stuck

604 A/D slope convergence failed

605 Cannot calibrate rundown gain

606 Rundown gain out of range

607 Rundown too noisy

608 Serial configuration readback failed

624 Unable to sense line frequency

625 I/O processor does not respond

626 I/O processor failed self-test

630 Fan test failed

631 System DAC test failed

632 Hardware test failed

Chapter 3 Calibration Procedures

Error Messages

Calibration Error Messages

Error Error Messages

701 Cal security disabled by jumper

702 Cal secured

703 Invalid secure code

704 Secure code too long

705 Cal aborted

708 Cal output disabled

712 Bad DAC cal data

713 Bad readback cal data

714 Bad OVP cal data

715 Bad OCP cal data

716 Bad DAC DNL error correction data

717 Cal OVP or OCP status enabled

718 Gain out of range for gain error correction

740 Cal checksum failed, secure state

741 Cal checksum failed, string data

742 Cal checksum failed, store/recall data in location 0

743 Cal checksum failed, store/recall data in location 1

744 Cal checksum failed, store/recall data in location 2

745 Cal checksum failed, store/recall data in location 3

746 Cal checksum failed, DAC cal constants

747 Cal checksum failed, readback cal constants

748 Cal checksum failed, GPIB address

749 Cal checksum failed, internal data

750 Cal checksum failed, DAC DNL error correction data

Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

This section contains an Excel Macros (Visual BasicÒ for Applications) program for calibration over the GPIB interface. This program makes software adjustments to the E3633A power supply using a current shunt and a digital multimeter which is connected to the controller. In this program a 0.001 ohm current shunt is used. Be sure to change the value of the variable ‘‘shunt’’ to the value of the current shunt used and the GPIB address for the power supply and the digital voltmeter.

'************************************************************************************** 'This program was written on a PC with Excel Macros (Visual Basic 'for Windows 95 or Windows NT 4.0. It will make software adjustments to the E3633A 'Power Supply on the GPIB bus using a Agilent 34401A Digital Multimeter and a current 'shunt. In the program a 0.001 ohm current shunt is used to measure current. Be sure to 'change the value of the variable ‘shunt’ to the value of the current shunt used. '************************************************************************************** Global id_power As Long Global id_DMM As Long Global power As Long Global DMM As Long Global Const VI_SUCCESS = &H0& Global Const VoltageMin = 0 Global Const VoltageMid = 1 Global Const VoltageMax = 2 Global Const CurrentMin = 3 Global Const CurrentMid = 4 Global Const CurrentMax = 5

Sub Calibration_Click()

Dim shunt As Single 'Current shunt value in Ohms Dim UserAnswer 'User response Range("B4:B6").ClearContents

If OpenPort = False Then ClosePort Exit Sub

End If

InitializeDevice

EnableOVPandOCP False

If CheckSecurity = False Then ClosePort Exit Sub

End If

for Applications)

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Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

If DacErrorCorrection = False Then ClosePort Exit Sub

End If

shunt = 0.001 'Change the current shunt value

UserAnswer = MsgBox("Voltage & OVP calibration. Connect the output to the DMM", vbYesNo + vbQuestion, "E3633A Calibration")

If UserAnswer = vbNo Then ClosePort Exit Sub End If

Range("B4").Select ActiveCell.Value = "Begin Voltage Calibration" StartCalibration VoltageMin, True, shunt 'Set output to minimum voltage cal ActiveCell.Value = "End Minimum Voltage Calibration" StartCalibration VoltageMid, True, shunt 'Set output to middle voltage cal ActiveCell.Value = "End Middle Voltage Calibration" StartCalibration VoltageMax, True, shunt 'Set output to maximum voltage cal ActiveCell.Value = "End Maximum Voltage Calibration" Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then ActiveCell.Value = "Voltage Calibration Complete" Else ActiveCell.Value = Message ClosePort Exit Sub End If

OVPandOCPCalibration True UserAnswer = MsgBox("Connect the Current shunt to the DMM input to measure a current. Connect the output to the shunt.", vbYesNo + vbQuestion, "E3633A Calibration") If UserAnswer = vbNo Then ClosePort Exit Sub End If

ActiveCell.Value = "Begin Current Calibration" StartCalibration CurrentMin, False, shunt 'Set output to minimum current cal ActiveCell.Value = "End Minimum Current Calibration" StartCalibration CurrentMid, False, shunt 'Set output to middle current cal

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Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

ActiveCell.Value = "End Middle Current Calibration" StartCalibration CurrentMax, False, shunt 'Set output to maximum current cal ActiveCell.Value = "End Maximum Current Calibration" OVPandOCPCalibration False Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then ActiveCell.Value = "Current Calibration Complete" Else ActiveCell.Value = Message ClosePort Exit Sub End If EnableOVPandOCP True SaveDate ActiveCell.Value = "Calibration Complete" Message = SendSCPI(power, "*RST") ClosePort End Sub

Private Function OpenPort() As Boolean 'Open communications on GPIB Dim Power_Address As String Dim DMM_Address As String Dim Error As Long

Power_Address = "5" 'Select power supply GPIB address between 0 to 30 DMM_Address = "22" 'Select DMM GPIB address between 0 to 30 Error = viOpenDefaultRM(id_power) 'Open the power supply VISA session If OpenPort = CheckError(Error, "Open ID Error to Power Supply") Then Exit Function End If Error = viOpenDefaultRM(id_DMM) 'Open the DMM VISA session If OpenPort = CheckError(Error, "Open ID Error to Digital Multi Meter") Then Exit Function End If Error = viOpen(id_power, "GPIB0::" & Power_Address & "::INSTR", 0, 1000, power) If OpenPort = CheckError(Error, "Unable Open to Power Supply") Then Exit Function End If Error = viOpen(id_DMM, "GPIB0::" & DMM_Address & "::INSTR", 0, 1000, DMM) If OpenPort = CheckError(Error, "Unable Open to Digital Multi Meter") Then Exit Function End If OpenPort = True End Function

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Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

Private Function InitializeDevice() SendSCPI power, "*Cls" SendSCPI DMM, "*Rst" 'Set power-on condition for DMM SendSCPI power, "*Rst" 'Set power-on condition for power supply End Function

Private Function CheckError(Error As Long, Message As String) As Boolean If Error < VI_SUCCESS Then ActiveCell.Value = Message CheckError = False 'Exit Calibration Else CheckError = True End If End Function

Private Function ClosePort() Dim Error As Long Error = viClose(power) Error = viClose(id_power) Error = viClose(DMM) Error = viClose(id_DMM) End Function

Private Function EnableOVPandOCP(bEnable As Boolean) If bEnable Then SendSCPI power, "Volt:Prot:Stat On" SendSCPI power, "Curr:Prot:Stat On" Else SendSCPI power, "Volt:Prot:Stat Off" SendSCPI power, "Curr:Prot:Stat Off" End If End Function

'This routine send a SCPI command string to the GPIB port. 'If the command contains a question mark, the response is read, and returned

Private Function SendSCPI(device As Long, command As String) As String Dim commandString As String Dim ReturnString As String Dim crlfpos As Integer Dim ReadBuffer As String * 512 Dim actual As Long Dim Error As Long commandString = command & Chr$(10)

Continued on next page

Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

Error = viWrite(device, ByVal commandString, Len(commandString), actual) If InStr(commandString, "?") Then Error = viRead(device, ByVal ReadBuffer, 512, actual) ReturnString = ReadBuffer crlfpos = InStr(ReturnString, Chr$(0)) If crlfpos Then ReturnString = Left(ReturnString, crlfpos - 2) End If SendSCPI = ReturnString End If End Function

Private Function delay(delay_time As Single) 'This routine is used to create delays Dim Finish As Single Finish = Timer + delay_time Do Loop Until Finish <= Timer End Function

Private Function CheckSecurity() As Boolean Dim Message As String Dim SecurityCode As String Message = SendSCPI(power, "Cal:Str?") Range("B5").Select ActiveCell.Value = Message Message = SendSCPI(power, "Cal:Count?") Range("B6").Select ActiveCell.Value = Message Range("B4").Select SecurityCode = "HP003633" SendSCPI power, "Cal:Sec:Stat Off," & SecurityCode Message = SendSCPI(power, "Cal:Sec:Stat?")

If InStr(Message, "1") Then ActiveCell.Value = "Unable to Unsecure the Power Supply" CheckSecurity = False Else Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then CheckSecurity = True Else ActiveCell.Value = Message CheckSecurity = False End If

End If End Function

Continued on next page

Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

Private Function DacErrorCorrection() As Boolean Dim Message As String SendSCPI power, "Output On" 'Turn on the power supply output SendSCPI power, "Cal:Dac:Error" For I = 1 To 27 delay 1 ActiveCell.Value = "Waitting for " & Str$(27 - I) & "secs" Next I SendSCPI power, "Output Off" 'Turn off the power supply output Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then ActiveCell.Value = "DAC DNL Error Correction completed for power supply" DacErrorCorrection = True Else ActiveCell.Value = Message DacErrorCorrection = False End If End Function

Private Function StartCalibration(mode As Integer, bVolt As Boolean, shunt As Single) Dim DMMdata As Single

SendSCPI power, "Output On" 'Turn on the power supply output Select Case mode Case VoltageMin SendSCPI power, "Cal:Volt:Level Min" 'Set output to minimum cal value Case VoltageMid SendSCPI power, "Cal:Volt:Level Mid" 'Set output to middle cal value Case VoltageMax SendSCPI power, "Cal:Volt:Level Max" 'Set output to maximum cal value Case CurrentMin SendSCPI power, "Cal:Curr:Level Min" 'Set output to minimum cal value Case CurrentMid SendSCPI power, "Cal:Curr:Level Mid" 'Set output to middle cal value Case CurrentMax SendSCPI power, "Cal:Curr:Level Max" 'Set output to maximum cal value End Select

delay 4 DMMdata = SendSCPI(DMM, "Meas:Volt:DC?") 'measure output

Continued on next page

Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

If bVolt Then

'Send the measured voltage value to the power supply SendSCPI power, "Cal:Volt:Data " & Str(DMMdata) Else 'Send the measured current value to the power supply

SendSCPI power, "Cal:Curr:Data " & Str(DMMdata / shunt) End If SendSCPI power, "Output Off" 'Turn off the power supply output End Function

Private Function OVPandOCPCalibration(bVolt As Boolean) SendSCPI power, "Output On" 'Turn on the power supply output If bVolt Then ActiveCell.Value = " Begin OVP Calibration" SendSCPI power, "Cal:Volt:Prot" 'Perform OVP circuit calibration Else ActiveCell.Value = " Begin OCP Calibration" SendSCPI power, "Cal:Curr:Prot" 'Perform OCP circuit calibration End If delay 9 SendSCPI power, "Output Off" 'Turn off the power supply output End Function

Private Function SaveDate() Dim Message As String 'calibration string enclosed in quotes Message = "Cal:Str " & Chr(34) & Date & Chr(34) SendSCPI power, Message Message = SendSCPI(power, "Cal:Str?") Range("B5").Select ActiveCell.Value = Message Message = SendSCPI(power, "Cal:Count?") Range("B6").Select ActiveCell.Value = Message

Range("B4").Select

End Function

End of Program

Chapter 3 Calibration Procedures

An Example program of Excel 97 for Calibration

Declaration for Windows 95/NT 4.0

Declare Function viOpenDefaultRM Lib "visa32.dll" (instrumentHandle As Long) As Long

Declare Function viOpen Lib "visa32.dll" (ByVal instrumentHandle As Long, _

ByVal viDesc As String, ByVal mode As Long, ByVal timeout As Long, _ vi As Long) As Long

Declare Function viClose Lib "visa32.dll" (ByVal vi As Long) As Long

Declare Function viWrite Lib "visa32.dll" (ByVal vi As Long, ByVal Buffer As String, ByVal count As Long, retCount As Long) As Long

Declare Function viRead Lib "visa32.dll" (ByVal vi As Long, ByVal Buffer As String, _ ByVal count As Long, retCount As Long) As Long

Theory of Operation

This chapter provides block diagram level descriptions of the power supply. The descriptions provide a basic understanding of circuit operation and are intended as an aid in troubleshooting. It is assumed in the following discussions that you are familiar with the operating and programming instructions presented in the E3633A and E3634A User’s Guide. Subjects covered include the following:

• Block Diagram Overview, starting on page 85

• AC Input and Bias Supplies, on page 87

• Floating Logic, starting on page 88

• D-to-A Converter, on page 90

• A-to-D Converter, on page 91

• Power Mesh and Control, starting on page 92

• Earth-Referenced Logic, on page 94

• Front Panel, on page 94

Chapter 4 Theory of Operation

Block Diagram Overview

This discussion pertains to the block diagram on the next page. The power supply’s circuitry is divided into two major blocks: the floating circuitry and the earth referenced circuitry. All power mesh and control circuits, display circuit, and digital circuits are contained in the floating circuitry. This circuitry also contains the power supply’s main controller. The earth referenced circuitry provides the interface between the user and the power supply.

The floating circuitry can be viewed in four pieces; the DAC system, the digital logic section (floating logic), the power mesh and control section, and the front panel (display and keyboard) section.

The floating logic receives digital signals from the earth-referenced logic and the DAC converts them to analog signals which are sent to the power control circuits in order to program the power supply’s output voltage and current. The power supply can also be commanded to send measurement and status data back to the remote interface controller and/or the VFD (vacuum fluorescent display) display on the front panel. The data is processed and sent back via the floating logic and earth-referenced logic.

The power mesh and control circuits contains voltage and current control circuits which allows the power supply to operate in either the constant voltage (CV) or constant current (CC) mode. The control circuits compare the power supply’s output voltage or current with the programmed value and generates a control signal which varies the conduction of the series pass transistor to raise or lower the output as required.

The front panel circuits consist of VFD control, display high voltage drivers, and keyboard scanning. Communication between the front panel and floating logic circuits is accomplished through a 4-wire bi-directional serial interface.

The earth referenced circuitry uses a controller configured as a slave to the main controller. This controller establishes external I/O communication with the main controller through a bi-directional, optically isolated, serial communications link. The earth referenced controller controls low-level GPIB (IEEE-488) and RS-232 interface operation.

Separate reference and bias supplies are provided for the floating and ground reference circuitry. The front panel operates from the floating circuitry with its logic common different from the main controller logic common.

Chapter 4 Theory of Operation

Block Diagram Overview

Block Diagram

Chapter 4 Theory of Operation

AC Input and Bias Supplies

Referring to the schematic shown on pages 129 and 130, the ac mains are connected by a fused power module. This module incorporates the functions of mains connection, fusing, and line voltage selection (100/115/230 Vac). The line voltage selection function of the module selects which primary winding of power transformer is energized. The transformer secondary windings are connected to the main pc board through connectors.

The bias supplies are consists of three sections; +5 Vdc and -5.1 Vdc for the power circuits and floating logic; ±17.4 Vdc for the display; and +5 Vdc for the earth referenced logic. Power-on reset signals are provided by the +5 Vdc supply of the floating logic.

The ±17.4 Vdc for the display circuits are produced by rectifier CR8, filter capacitors C18 and C19, and voltage regulators U12 and U16. A separate winding of transformer provides a center tapped 6 Vrms filament supply for the display.

The floating +5 Vdc is produced from the separate winding of transformer. The +5_REF signal is derived from +15 Vdc supply and the TURN_ON RESET signal is derived from +5 Vdc supply. The FAN FAIL signal is asserted when the fan current through R20 is not detected. The TURN_ON RESET signal holds the main controller and other logic in a reset state until the +5 Vdc logic power is fully operational. This signal is generally active only following application of line power to the instrument.

The +5V dc earth referenced supply is produced by rectifier CR4, filter capacitor C23, and regulator U9. The GPIB (IEEE-488) and RS-232 computer interfaces are powered from this supply.

Chapter 4 Theory of Operation

Floating Logic

Referring to the schematic shown on page 132, the floating common logic controls operation of the entire instrument. All output functions and bus command interpretation is performed in the main controller U19. The front panel and the earth referenced logic operate as slaves to U19. The floating common logic is comprised of the main controller U19, custom gate array U20, the program ROM U13, RAM U14, calibration EEPROM U15, and the 12 MHz clock oscillator. Non-volatile EEPROM U15 stores calibration constants, calibration secure code, calibration count, and store/recall variables. Poweron reset is provided to the main controller by the voltage regulator U10.

The main controller U19 is a 16-bit micro controller. It controls such features as receive and transmit serial port, timer/counter ports, and selectable input 10-bit successive approximation A-to-D converter ports.

A conventional address/data bus is used to transfer data between the main controller and external ROM and RAM. When the address latch enable (ALE) signal goes high, address data is present on the address/data bus. ASIC U20 latches the address data and decodes the correct chip enable (low true) for external ROM and RAM accesses and for read/write accesses to the internal registers of U20. The system memory map is shown below.

0000H - 1FF7

- 1FFF

1FF8

2000

- FFFF

U14 32k x 8 RAM U20 Gate Array U13 Program ROM

Program ROM U13 contains four 64k x 8 data banks of data. Banks are selected by controlling A16 and A17 ROM address bits directly from the main controller port bits.

Custom gate array U20 performs address latching and memory map decoding functions as discussed above. In addition, U20 contains a variety of internal read/write registers. The read (XRD) and write (XWR) signals transfer data out of and into U20 when it is addressed. There are four internal registers in U20: an internal configuration register, an 8 bit counter register, a serial transmit/ receive register, and an internal status register.

Th e c ou nt er r eg is te r is u se d t o ca pt ur e t he A DC slo pe co un t at th e C OM P i np ut . The COMP input functions as both a clocked comparator and the slope counter input for the ADC. In both cases the counter register captures the lower 8 bits of a 24-bit counter. The upper 16 bits of the count are captured by the SYNC input to U19.

Chapter 4 Theory of Operation

Floating Logic

The serial register is used to send and receive serial data bytes from the main controller to the DAC system, or to communicate with the front panel controller. The serial register is multiplexed to these two circuits. The transmission rate is selected to 1.5 M bits/second for the DAC system and

93.75 k bits/second for communication with the front panel controller. The general serial interface is a 3-bit interface as shown below.

U20 Internal Signal Configuration Signals Front Panel Signals

Serial Clock SERCK XFPSK

Data OUT (send) SERDAT FPDI

Data IN (receive) SERRBK FPDO

Serial data is received simultaneously as serial data is clocked out. Front panel data is exchanged in both directions whenever a byte is sent from U20. The input data of DAC is strobed to outputs by U19 signal SERSTB. Interrupts from the front panel are detected by U20 and signaled to the CHINT. The main controller FPINT signals the front panel controller that U20 has data to send.

The power supply’s calibration data are stored in a 256 x 16 bit non-volatile electrically erasable ROM U15. This non-volatile ROM read/write data is accessed by a 4-bit serial protocol controlled by U19.

The main controller has an on-chip 10-bit successive approximation ADC. The FLASH input is used to sample the residual charge on the main integrating ADC output of U25.

Port bits are also configured to measure the input power line frequency (LSENSE). Frequencies from 55 Hz to 66 Hz are measured as 60 Hz. All other line input frequencies are assumed to be 50 Hz.

The main controller communicates with the earth referenced controller U1 through an optically isolated (U2 and U5) asynchronous serial link. Data is sent in an 11-bit frame at a rate of 187.5 k bits/ second. When the RS-232 interface is selected, data is sent across the isolated link at 93.75 k bits/second. The 11bit data frame is configured for one start bit, eight data bits, one control bit, and one stop bit.

Chapter 4 Theory of Operation

D-to-A Converter

Referring to the schematic shown on page 131, all reference voltages of power circuits are derived from the internal voltage reference of system DAC U22. The system DAC track/hold amplifier outputs are used to provide controllable reference voltages to power circuits. The system DAC is programmed and responds to the main controller via internal 3-wire serial data bus SERCLK, SERRBK, and SERSTB. The system DAC is multiplexed to 6 track/hold amplifiers through U26. Each track/hold amplifier is refreshed approximately every 1 msec to maintain its output setting. Changes to track/hold amplifier outputs are accomplished by dwelling on that position for an extended period.

Chapter 4 Theory of Operation

A-to-D Converter

Referring to the schematic shown on page 131, the analog-to-digital converter (ADC) is used to change dc voltages into digital information. The circuitry consists of an integrator amplifier (U25 and U28), current steering switch U32, resistors (R72, R73, and R98), voltage reference U31, ADC controller U20, and residue ADC in U19.

The ADC method used by the power supply is called multislope III. Multislope III is a charge balancing continuously integrating analog-to-digital converter. The input voltage continuously forces charge onto the integrator capacitors C50 and C52 through R73.

Switch U32 steers fixed positive or negative reference currents onto the integrator capacitors to cancel, or balance the accumulated input charge. The l e ve l s hi f t ed (R 9 9 a n d R 10 0 ) o ut p u t o f t he i n te g ra t o r i s c h ec k e d e v er y 2 . 66 m s ec by the U20 COMP input. Logic state machines in U20 control the U32 current steering to continuously seek an approximate 2.5 V level on the integrator amplifier output, FLASH. If the ADC input voltage is between ±15 V, the integrator output (FLASH) will remain within the 0 V to 5 V range of the U19 on-chip ADC. The U19 ADC input (FLASH) is clamped to 0 V or 5 V by R47 and CR14 to protect U19.

The integrator amplifier is formed by U25 and U28. Resistors R60 and R61 affect the amplifier stability. Amplifier oscillation may occur if their values are incorrect. Amplifier U28 improves the offset voltage characteristics of integrator amplifier U25.

Each analog-to-digital conversion occurs continuously. The ADC starts by clearing the integrator slope count in U20. At the end of the integration period, the slope count is latched. The slope count provides the most significant bits of the input volta ge conversion. The lea st significant bits are converte d by the on-chip ADC of U19.

U40 provides a stable +5 V reference voltage for ADC. U31A amplifies the voltage reference to +10 V while amplifier U31B inverts the +10 V reference to

-10 V. The reference voltage forces precision slope currents for the integrating ADC through R72 and R98.

Chapter 4 Theory of Operation

Power Mesh and Control

Refer to the schematics shown on page 129.

For the power mesh and control circuit, the preregulator which is controlled by the phase control circuits is added ahead of the series pass transistor to minimize the power dissipated at the series pass transistor by controlling the dc level across the input filter capacitor, depending on the output voltage.

For the dual range of output, a controlled transformer tap switching is used. It is accomplished by two SCR and one bridge diode and the SCR control circuit in t he po we r c ir cui t; C R1 7, CR 19, an d C R4 4. By tu rn in g o n o r off th e S CR , t he se circuits allow the input capacitors (C39, C46, and C74) to charge to one of two discrete voltage levels, depending on the output voltage required. When all SCR’s are not fired, the bridge diode conducts and the lowest voltage of two discrete voltage levels is developed across the input filter capacitors.

The SCR control circuit determines whether SCR is to be fired by monitoring the output voltage and comparing this value against internally derived reference levels.

The series pass transistor is part of the feedback loop which consists of the driver and the Constant Voltage/Constant Current error amplifier. This feedback loop provides ‘’fine and fast’’ regulation of the output while the feedback loop which is controlled by transformer tap switching handles large, relatively slow, and regulation demands.

The series pass transistor is made to alter its conduction to maintain a constant output voltage or current. The voltage developed across the current sampling resistors is the input to the constant current error amplifier. The constant voltage error amplifier obtains its input from differential amplifier which senses the output voltage. Any changes in output voltage or current are detected and amplified by the constant voltage or constant current error circuit and applied to the series pass transistor in the correct phase and amplitude to counteract the change in output voltage or current.

Chapter 4 Theory of Operation

Power Mesh and Control

Two error amplifiers are included in a CV/CC supply, one for controlling output voltage, the other for controlling output current. Since the constant voltage amplifier tends to achieve zero output impedance and alters the output current whenever the load resistance changes, while the constant current amplifier causes the output impedance to be infinite and changes the output voltage in response to any load resistance change, it is obvious that the two amplifiers can not operate simultaneously. For any given value of load resistance, the power supply must act either as a constant voltage source or as a constant current source - it can not be both; transfer between these two modes is accomplished at a value of load resistance equal to the ratio of the output voltage control setting to the output current control setting.

Full protection against any overload condition is inherent in the Constant Voltage/Constant Current design principle since there is not any load condition that can cause an output which lies outside the operating region. For either constant voltage or constant current operation, the proper choice of front panel voltage and current limit settings insures optimum protection for the load device as well as full protection for the power supply.

The diodes connected across the output terminals in reverse polarity protect the output electrolytic capacitor and the series pass transistors from the effects of a reverse voltage applied across the output terminals.

Chapter 4 Theory of Operation

Earth-Referenced Logic

Referring to the schematic shown on page 133, the earth referenced logic circuits schematic provides all rear panel input/output capability. Microprocessor U1 handles GPIB (IEEE-488) control through bus interface chip U6 and bus receiver/driver chips U3 and U11. The RS-232 interface is also controlled through microprocessor U1. RS-232 transceiver chip U19 provides the required level shifting to approximate ±9 volt logic levels through on-chip charge-pump power supplies using C3 and C9. Communication between the earth referenced logic interface circuits and the floating logic is accomplished through an optically-isolated bi-directional serial interface. Isolator U5 couples data from U1 to processor U19. Isolator U2 couples data from U19 to microprocessor U1.

Front Panel

Referring to the schematic shown on page 135, the front panel circuits consist of vacuum fluorescent display control, display high voltage drivers, and keyboard scanning. Communication between the front panel and floating logic circuits is accomplished through a 4-wire bi-directional serial interface. The main controller U19 can cause a hardware reset to front-panel controller by signal IGFPRES. The front panel logic operates from -12.4 volts (logic 1) and -

17.4 volts (logic 0). The front panel logic high supply (-12.4 volts) is produced by the -17.4 volts bias supply and the voltage regulator U2 on the front panel board. The four serial communication signals are level shifted by the comparator U8 from the floating logic 0 V to 5 V levels to the -17.4 V to -12.4 V levels present on the front panel assembly. U2 acts as the serial shift register interface for the front-panel controller U5 on the front panel board.

Display anode and grid voltages are +17.4 volts for an ‘’on’’ segment and -17.4 volts for an ‘’off’’ segment. The -11.2 V cathode bias for the display is provided by filament winding center tap bias circuit VR1, R18, and C25 on the main board. Keyboard scanning is accomplished through a conventional scanned row-column key matrix. Keys are scanned by outputting data at front-panel controller U5 port pins P0.0 through P0.3 to poll each key column for a key press. Column read-back data are read by the microprocessor at port pins P1.0 through P1.3 for decoding and communication to the floating logic circuits.

Service

This chapter discusses the procedures involved for returning a failed power supply to Agilent Technologies for service or repair. Subjects covered include the following:

• Operating Checklist, on page 97

• Types of Service Available, starting on page 98

• Repacking for shipment, on page 99

• Electrostatic Discharge (ESD) Precautions, on page 100

• Surface Mount Repair, on page 100

• To Replace the Power-Line Fuse, on page 100

• To Disconnect the Output Using an External Relay, on page 101

• Troubleshooting Hints, starting on page 102

• Self-Test Procedures, starting on page 104

Chapter 5 Service

Operating Checklist

Before returning your power supply to Agilent Technologies for service or repair check the following items:

Is the Power Supply Inoperative?

Verify that the ac power cord is connected to the power supply.

Verify that the front-panel power switch is depressed.

Verify that the power-line fuse is installed:

Use the 6.3 AT, 250 V fuse for 100 or 115 Vac operation.

Use the 3.15 AT, 250 V fuse for 230 Vac operation.

Verify the power-line voltage setting.

See ‘‘To prepare the power supply for use’’ on page 23.

Does the Power Supply Fail Self-Test?

Verify that the correct power-line voltage is selected.

See ‘‘To prepare the power supply for use’’ on page 23.

Remove all load connections to the power supply.

Ensure that all terminal connections are removed while the self-test is

performed.

Chapter 5 Service

Types of Service Available

If your power supply fails within three years of original purchase, Agilent Technologies will repair or replace it free of charge. If your unit fails after your three year warranty expires, Agilent will repair or replace it as a very competitive price. Agilent will make the decision locally whether to repair or replace your unit.

Standard Repair Service (worldwide)

Contact your nearest Agilent Service Center. They will arrange to have your power supply repaired or replaced.

Express Exchange (U.S.A. only)

You can receive a replacement Agilent E3633A or E3634A via overnight shipment for low downtime.

1 Call 1-800-258-5165 and ask for ‘‘Express Exchange.’’

• You will be asked for your shipping address and a credit card number to guarantee return of your failed power supply.

• If you do not return your failed power supply within 45 days, your credit card will be billed for a new Agilent E3633A or E3634A.

• If you choose not to supply a credit card number, you will be asked to send your failed unit to a designated Agilent Service Center. After the failed unit is received, Agilent will send your replacement unit.

2 Agilent will immediately send a replacement Agilent E3633A or

E3634A to you via overnight shipment.

• The replacement unit will have a different serial number than your failed unit.

• If you can not accept a new serial number for the replacement unit, use the Standard Repair Service option described above.

• If your failed unit was ‘‘in-warranty,’’ your replacement unit continues the original three year warranty period. You will not be billed for the replacement unit as long as the failed unit is received by Agilent.

• If your three year warranty has expired, Agilent will bill you for the Agilent E3633A or E3634A exchange price - less than a new unit price. Agilent warrants exchange units against defects for 90 days.

Chapter 5 Service

Repacking for Shipment

For the Express Exchange Service described on the previous page, return your failed Agilent E3633A or E3634A to the designated Agilent Service Center using the shipping carton of the exchange unit. A shipping label will be supplied. Agilent will notify you when your failed unit has been received.

If the instrument is to be shipped to Agilent for service or repair, be sure to:

• Attach a tag to the power supply identifying the owner and indicating the required service or repair. Include the instrument model number and full serial number.

• Place the power supply in its original container with appropriate packaging material.

• Secure the container with strong tape or metal bands.

If the original shipping container is not available, place your unit in a container which will ensure at least 4 inches of compressible packaging material around all sides for the power supply. Use static-free packaging materials to avoid additional damage to your unit.

Agilent Technologies recommends that you always insure shipments.

Agilent Technologies E3634A, E3633A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

The Front Panel at a Glance

Front-Panel Voltage and Current Limit Settings

Display Annunciators

The Rear Panel at a Glance

In This Book

Contents

Specifications

Performance Specifications

Supplemental Characteristics

Quick Start

To Prepare the Power Supply for Use

To Check the Rated Voltages of the Power Supply

To Check the Rated Currents of the Power Supply

To Use the Power Supply in Constant Voltage Mode

To Use the Power Supply in Constant Current Mode

To Store and Recall the Instrument State

To Program Overvoltage Protection

Setting the OVP Level and Enable the OVP Circuit

Checking OVP Operation

Clearing the Overvoltage Condition

To Program Overcurrent Protection

Setting the OCP Level and Enable the OCP Circuit

Checking OCP Operation

Clearing the Overcurrent Condition

To Rack Mount the Power Supply

Calibration Procedures

Agilent Technologies Calibration Services

Calibration Interval

Automating Calibration Procedures

Test Considerations

Recommended Test Equipment

Performance Verification Tests

Performance Verification Tests

Self-Test

Measurement Techniques

Setup for Most Tests

Electronic Load

General Measurement Techniques

Current-Monitoring Resistor

Programming

Constant Voltage (CV) Verifications

Constant Voltage Test Setup

Voltage Programming and Readback Accuracy

CV Load Effect (Load Regulation)

CV Source effect (Line Regulation)

CV PARD (Ripple and Noise)

Load Transient Response Time

Constant Current (CC) Verifications

Constant Current Test Setup

Current Programming and Readback Accuracy

CC Load Effect (Load Regulation)

CC Source Effect (Line Regulation)

CC PARD (Ripple and Noise)

Common Mode Current Noise

Performance Test Record for Agilent E3633A and E3634A

CV Performance Test Record

CC Performance Test Record

Calibration Security Code

To Unsecure the Power Supply for Calibration

To Unsecure the Power Supply Without the Security Code

Calibration Count

Calibration Message

General Calibration/Adjustment Procedure

Front Panel Voltage and Current Calibration

Aborting a Calibration in Progress

Calibration Record for Agilent E3633A/E3634A

Error Messages

An Example program of Excel 97 for Calibration

Theory of Operation

Block Diagram Overview

AC Input and Bias Supplies

Floating Logic

D-to-A Converter

A-to-D Converter

Power Mesh and Control

Earth-Referenced Logic