HP 6002A - User Manual

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HP 6002A

Power Supply

HP 1000

Computer

HEWLETT'

PACKARD

Programming

Guide

Device Introduction

The

6002A

Power

Supply1

employs a unique ex-

tended range technique which allows it to furnish maximum

output power over a wide range of

voltage

and

current com-

binations. The supply can provide a full 200 watts of output

from

20V, 10A to 50V,

4A.

The output

fully adjustable

through the enti

operating range of

+50

volts and 0

to 10 amps

front-panel voltage

and

current controls.

Option 001,

the HP-IB interface allows the supply

digitally controlled from a calculator, computer,

other con-

troller.

Either

the

output

voltage

current

can be

programmed.

A pair of switches on the rear

panel of the supply allows

selection of anyone of three modes of operation: local, HP-IB

constant voltage (CV),

HP-IB constant current (CC). The

6002A acts only as a listener on the bus.

Addressing

Before the 6002A can accept programming information, it

must

addressed to listen. The 6002A has listener capabil-

ity only. The switches which allow the 6002A to

addressed

a listener are located on the rear panel. They are

the

upper right hand-corner of the box, just to the right of the

HP-IB connector.

There are seven switches, but

only the left five are used.

Note that the

6002A address cannot

read directly off of the

rear

panel

binary. The least significant bit is farthest

the

left

shown in figure 9-1. The octal address shown

Constant voltage (CV) or constant current (CC) operation

must

also

set (also shown

figure 9-1). The HP-IB option

001

circuits are factory adjusted for CV operation

. See the

"Programming" section for more details.

The

6002A Operating and Service Manual (06002-90001), the

HP-IB Power Supply Interface Guide (5952-3990), and Application

Note

401-1 (5953-2800) should

used with this note.

2Constant current

(GG)

adjustments are also discussed

Appendix

the 6002A Operating and Service Manual (06002-90001).

Application Note 401-9

System Preparations

Assignment

One logical unit should

assigned to the 6002A. Assuming

the switches are set to

address of 5

shown

figure 9-1,

the

assignment may

performed from File Manager,

:SYLU,17,10,S8

This statement would assign

17 to equipment table

10.

The device address associated with

17 would

ADDRESS

SWITCH

-7

IGNORED

D D

Figure 9-1. 6002A Listen Address and Mode Switches

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features (Calibration/Adjustment)

The HP 6002A DC Power Supply is a versatile and programmable power supply designed for use with an HP 1000 Computer, enabling digital control via an HP-IB (Hewlett-Packard Interface Bus) interface (Option 001). It is primarily used for testing electronic components and providing stimulus to process control equipment.

Function Description:

The HP 6002A utilizes a unique extended range technique to deliver a maximum output power of 200 watts across a wide range of voltage and current combinations. It can provide output from 20V at 10A to 50V at 4A. The output voltage is fully adjustable from +0 to +50 volts, and the current is adjustable from 0 to 10 amps using front-panel controls.

When equipped with the HP-IB interface (Option 001), the supply can be digitally controlled by a calculator, computer, or other controller. It functions as a "listener" on the bus, meaning it receives programming commands but does not initiate communication. The HP-IB option essentially acts as a digital-to-analog converter (DAC) that voltage-programs the power supply's constant voltage (CV) or constant current (CC) output in either a high or low range. The DAC automatically provides a voltage-programming output as soon as four digits are received, and this output is maintained until the next four digits are received. The DAC is programmed using magnitude digits in BCD, where 000 equals 00.0% of full range, 500 equals 50.0% of full range, and 999 equals 99.9% of full range.

The supply offers three modes of operation, selectable via rear-panel switches:

Local: Manual control using front-panel knobs.
HP-IB Constant Voltage (CV): The output voltage is programmed digitally, and the supply maintains a constant voltage. If the load current exceeds a preset limit, the supply automatically transitions to constant current operation.
HP-IB Constant Current (CC): The output current is programmed digitally, and the supply maintains a constant current. If the load voltage exceeds a preset limit, the supply automatically transitions to constant voltage operation.

Important Technical Specifications:

Output Power: 200 watts maximum.
Voltage Range: +0 to +50 volts.
Current Range: 0 to 10 amps.
Programmable Output Ranges (Magnitude Digits 0-999):
- Low Range CV: 0 to 9.99V (99.9% of 10V)
- High Range CV: 0 to 49.95V (99.9% of 50V)
- Low Range CC: 0 to 1.998A (99.9% of 2A)
- High Range CC: 0 to 9.99A (99.9% of 10A)
Programming Data Word Format: Four ASCII characters (digits).
- D1 (First Digit): Specifies range (1 for low range, 2 for high range).
- D2, D3, D4 (Next Three Digits): Specify desired magnitude (000-999, representing percentage of full scale).
Response Time:
- Programming from 0 to 99.9% of maximum rated output voltage: Less than 100 milliseconds (independent of load).
- Programming down from 100% to 0.1% of maximum rated output: Approximately 400 milliseconds without load, approximately 200 milliseconds with full load. The slower time without load is due to the output capacitor discharging more slowly.

Usage Features:

HP-IB Interface (Option 001): Allows for digital control of output voltage or current, making it suitable for automated test setups.
Listener-Only Device: Simplifies bus communication as it only responds to commands.
Addressability: The device address is set via rear-panel switches. The least significant bit is the leftmost switch.
Mode Selection: Rear-panel switches allow selection between local, HP-IB CV, and HP-IB CC modes.
Configuration for HP-IB: Requires specific configuration for the HP 1000, including Logical Unit (LU) assignment and ensuring proper handling of record terminators. The 6002A expects four ASCII characters without an end-of-record terminator (CRLF will confuse it). An underline character ("_") must be appended to output records from FORTRAN to suppress CRLF.
Buffering: The buffering option for the 6002A EQT should be turned off until valid operation is confirmed.
Time-out Handling: The operating system typically handles time-out errors, as the 6002A either listens and accepts data or an error condition exists.
SRQ and DMA: SRQ (Service Request) is not applicable, and DMA (Direct Memory Access) is not usually allocated for the 6002A.

Maintenance Features (Calibration/Adjustment):

The manual details a procedure for adjusting the HP-IB option 001 for CC operation, which involves several steps:

Test Setup: Use a constant current test setup with specific load resistors (RL1, RL2) and a current sampling resistor (RS).
Warm-up: Allow a 30-minute warm-up period after connecting the power supply to the HP 1000 and turning it on.
CC Zero Output Adjustment:
- Connect an oscilloscope to the +S and -S terminals.
- Alternately program data words 2000 (zero high range) and 1000 (zero low range) with a 50msec delay.
- Adjust the ZERO ADJUST potentiometer (A300R19) and the ZERO BALANCE ADJUST potentiometer (A300R4) simultaneously to achieve a straight line at zero on the oscilloscope.
CC High Range Full Scale Output Adjustment:
- Program data word 2999.
- Adjust A300R7 for a reading of 0.0999V on a digital voltmeter connected across R(S).
CC Low Range Full Scale Output Adjustment:
- Program data word 1999.
- Adjust A300R9 for a reading of 0.01998V on a digital voltmeter connected across R(S).
Recheck Adjustments: Repeat steps e through g if necessary.
Operational Setup: After adjustments, turn off the supply, connect a short across the rear output terminals, set mode switches to CC, and turn on the supply. Program the desired output current and adjust the front panel VOLTAGE control for the desired maximum output voltage.

The manual includes a diagram (Figure 9-6) showing component adjustment locations for these potentiometers and other internal components. Further details on range programming and adjustments can be found in Appendix A of the 6002A Operating and Service Manual.