Krohn-Hite 522 User manual

Model 522
Manual/Remote Controlled (GPIB Programmable)
DC Voltage/Current Calibrator
Operating Manual

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PROGRAMMABLE
VOLTAGE
DC CURRENT CALIBRATOR
Model 522
Serial No.______________

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522
OPERATORS
MANUAL
Copyright © 1999
Electronic Development Company
Division of KROHN-HITE
15 Jonathan Drive Unit 4
Brockton, Massachusetts 02301
E-mail: [email protected]
www.krohn-hite.com
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in
any form by any means, electronic, mechanical photocopying, recording, or otherwise, without the prior written
permission of Electronic Development Company
Printed in U.S.A.
Version 3.27
Revised January 2003
Information furnished in this manual is believed to be accurate and reliable. However, no responsibility is assumed
by Electronic Development Company for its use; nor for any infringements of patents or other rights of third
parties which may result from its use.

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522 TABLE OF CONTENTS
SECTION TITLE
iList of Drawings
ii Limited Warranty
iii Factory Service Request and Authorization
iv Packing Suggestions
I DESCRIPTION AND SPECIFICATIONS
1.1.0 General Description
1.2.0 Features and Applications
1.2.1 Features
1.2.2 Applications
1.3.0 Output Specifications
1.4.0 General Specifications
1.5.0 Mechanical Specifications
1.6.0 General Information
II INSTALLATION
2.1.0 Mounting
2.2.0 Mating Connectors
2.3.0 IEEE 488 Cables
2.4.0 AC Power Input Considerations
2.5.0 Thermal Considerations
III OPERATION OF THE INSTRUMENT
3.1.0 Front Panel Controls
3.2.0 Front Panel Indicators
3.3.0 Output Connections
3.4.0 Remote Programming with the IEEE 488 Bus
3.5.0 Remote Programming with the RS-232 Option
3.6.0 Voltage Compliance Limit Control
3.7.0 Operating Voltage Conversion
IV THEORY OF OPERATION
4.1.0 Introduction
4.2.0 Control Board
4.3.0 Microprocessor Circuits
4.4.0 Digital Board IEEE 488 Logic
4.5.0 Digital to Analog Converter
4.6.0 Output Amplifier
4.7.0 Output Switching
4.8.0 Range Logic

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TABLE OF CONTENTS (Continued)
V CERTIFICATION AND TESTING
5.1.0 Recommended Equipment
5.2.0 Calibration Procedure
VI OPTIONS - (If Installed)
6.1.0 1 Volt Option RA-7
6.2.0 Calibration. of the RA-7 option.
VII PARTS LIST
7.0.0 Replacement Parts for Model 522
NOTE: Errata and addendum (if any) will appear in the back of this manual.

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522 MANUAL
LIST OF DRAWINGS
DESCRIPTION DRAWING #
MPU Flow Chart A-4634 Rev. A
IEEE-488 Logic Schematic A-4610 Rev. D
1V Range Board Schematic - Option RA-7 A-4636 Rev. F
1V Range Board Layout - Option RA-7 A-4817 Rev. F
System Block Diagram B-4633 Rev. A
Power Supply Schematic B-4615 Rev. B
522 Control Board Schematic (Displays ) B-4819 Rev. A
522 Control Board Schematic (Switches) B-4820 Rev. A
MPU Board Schematic B-4763 Rev. A
DAC Schematic C-4614 Rev. C
Range Logic Schematic B-4611 Rev. B
Output Amplifier Schematic B-4613 Rev. B
Output Switching Schematic B-4612 Rev. C
522 Control Board Layout B-4822 Rev. A
MPU Board Layout B-4765 Rev. A
Motherboard Layout B-4630 Rev. I
Motherboard Layout B-4631 Rev. I
Reference Drawing 930727A
Front or Rear Terminal Connector CB-4718

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LIMITED WARRANTY
The ELECTRONIC DEVELOPMENT COMPANY (E.D.C.) warrants to the original
purchaser each instrument manufactured by them to be free from defects in material and
workmanship. This warranty is limited to servicing, repairing and/or replacing any instrument or
part thereof returned to the E.D.C. factory for that purpose in accordance with the instructions set
forth below; and furthermore to repair or replace all materials, except tubes, fuses, transistors and
other semiconductor devices which shall within ONE YEAR of shipment to the original purchaser
be returned to the E.D.C. factory and upon examination be deemed defective.
E.D.C. instruments may not be returned to the factory under the terms of this warranty
without the prior authorization of the E.D.C. Service Department. All instruments returned to
E.D.C. for service hereunder should be carefully packed and shipped. All transportation charges
shall be paid by the purchaser.
EDC reserves the right to discontinue instruments without notice and to make changes to
any instrument at any time without incurring any obligation to so modify instruments previously
sold.
This warranty is expressly in lieu of all other obligations or liabilities on the part of EDC.
No other person or persons is authorized to assume in the behalf of EDC any liability in the
connection with the sale of its instruments.
CAUTION:The instrument you have purchased is a precision instrument
manufactured under exacting standards. Any attempts to repair, modify or
otherwise tamper with the instrument by anyone other than an EDC employee or
authorized representative may result in this warranty becoming void.

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FACTORY SERVICE REQUEST
AND
AUTHORIZATION
WARRANTY SERVICE
Instruments may be returned only on prior authorization. Please
obtain a RETURN AUTHORIZATION NUMBER either directly from the
factory or from an authorized E.D.C. Representative. (See General
Information below.)
CHARGEABLE REPAIRS
If requested, an estimate of charges will be submitted prior to
repairs. We suggest that you request a RETURN AUTHORIZATION NUMBER
to facilitate handling.
GENERAL INFORMATION
A) Please provide the following information in order to expedite
the repair:
1) Indicate MODEL
2) Serial Number
3 Complete description of the trouble:
Symptoms, measurements taken, equipment used, lash-up
procedures, attempted repairs, suspected location of
failure and any other pertinent information.
B) Freight Charges must be PREPAID.
C) The RETURN AUTHORIZATION NUMBER should be noted on your
documentation.
D) See Packing Suggestions - next page.

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PACKING SUGGESTION
Although your E.D.C. instrument is built for laboratory, production environment and some field
environment, it is NOT ruggedized. Therefore ...
1. Be sure the carton is STRONG enough to carry the weight of the instrument, e.g. use
double wall corrugation.
2. Be sure the carton is LARGE enough to allow for sufficient packing material, e.g., at least
2 inches all around the instrument. The packing material should be able to be compressed
and then return to its approximate original volume.
3. For better handling, the shipment should always be by AIR FREIGHT (expect for short
distances). You might use either UPS "blue label" or common air freight carrier, second
day air.
Please do not bounce it across the country in a truck. It may not hurt it, but it certainly is
not going to do a laboratory instrument much good.
4. QUESTIONS? Just contact us. We will be pleased to help you.