Krohn-Hite 7000 Operating Manual

Model 7000
Low Noise Differential Preamplifier

Operating Manual

Service and Warranty

Krohn-Hite Instruments are designed and manufactured in accordance with sound engineering practices and should

give long trouble-free service under normal operating conditions. If your instrument fails to provide satisfactory

service, and you are unable to locate the source of trouble, contact our Service Department at [phone], giving

all the information available concerning the failure.

DO NOT return the instrument without our written or verbal authorization to do so. After contacting us, we will issue

a Return Authorization Number which should be referenced on the packing slip and purchase order. In most cases, we

will be able to supply you with the information necessary to repair the instrument, avoiding any transportation

problems and costs. When it becomes necessary to return the instrument to the factory, kindly pack it carefully and

ship it to us prepaid.

All Krohn-Hite products are warranted against defective materials and workmanship. This warranty applies for a

period of one year from the date of delivery to the Original Purchaser. Any instrument that is found within the one

year warranty period not to meet these standards will be repaired or replaced. This warranty does not apply to fuses

or batteries. No other warranty is expressed or implied.

Krohn-Hite Corporation reserves the right to make design changes at any time without incurring any obligation to

incorporate these changes in instruments previously purchased.

Modifications to this instrument must not be made without the written consent of an authorized employee of Krohn-

Hite Corporation.

Model 7000

Low Noise Differential Preamplifier

OPERATING MANUAL

Unit 4, 15 Jonathan Drive, Brockton, MA 02301-5566

E-mail: [e-mail]; Web: www.krohn-hite.com

Copyright © 2012 Krohn-Hite Corporation. 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 Krohn-Hite Corporation.

Tel: [phone]; Fax: [phone]

V1.1 Dated: 01/12

1

TABLE OF CONTENTS

1.0 SECTION 1 - GENERAL DESCRIPTION ......................................................................................................... 5

1.1 INTRODUCTION ..................................................................................................................................... 5

1.1.1 DESCRIPTION ........................................................................................................................... 5

1.1.2 APPLICATION ............................................................................................................................ 5

1.2 SPECIFICATIONS ................................................................................................................................... 5

1.2.1 INPUT ......................................................................................................................................... 5

1.2.2 FILTERS ..................................................................................................................................... 6

1.2.3 OUTPUT ..................................................................................................................................... 6

1.2.4 GENERAL ................................................................................................................................... 7

1.2.5 FRONT PANEL .......................................................................................................................... 7

1.2.6 REAR PANEL ............................................................................................................................. 7

1.2.7 OPTIONS .................................................................................................................................... 7

1.2.8 ACCESSORIES .......................................................................................................................... 7

2.0 SECTION 2 – OPERATION .............................................................................................................................. 9

2.1 INTRODUCTION ..................................................................................................................................... 9

2.2 POWER REQUIREMENTS ..................................................................................................................... 9

2.3 TURN-ON PROCEDURE ........................................................................................................................ 9

2.4 REPLACING THE POWER FUSE .......................................................................................................... 10

2.5 FRONT PANEL CONTROLS .................................................................................................................. 10

2.5.1 GAIN ........................................................................................................................................... 10

2.5.2 DC OFFSET ............................................................................................................................... 10

2.5.3 INPUT CONNECTIONS ............................................................................................................. 11

2.5.4 INPUT COUPLING ..................................................................................................................... 11

2.5.5 INPUT + AND – BNC CONNECTORS ....................................................................................... 11

2.5.6 BANDWIDTH (FILTERS) ............................................................................................................ 11

2.5.7 OUTPUT CONNECTIONS ......................................................................................................... 12

2.5.8 OPTIONAL RMS-TO-DC OUTPUT ............................................................................................ 12

3.0 SECTION 3 – INCOMING ACCEPTANCE ....................................................................................................... 15

3.1 INTRODUCTION ..................................................................................................................................... 15

3.2 TEST EQUIPMENT REQUIRED ............................................................................................................. 15

3.3 CUTOFF FREQUENCY ACCURACY ...................................................................................................... 15

3.4 GAIN ACCURACY ................................................................................................................................... 15

3.5 NOISE CHECK ........................................................................................................................................ 16

2

3.6 COMMON MODE REJECTION ......................................................................................................................... 16

3.7 DISTORTION CHECK ....................................................................................................................................... 16

3.8 AC/DC COUPLING CHECK .............................................................................................................................. 17

Figure 1.1 - Model 7000 Low Noise Differential Preamplifier

3

Certification

Krohn-Hite Corporation certifies that this product meets its published specifications at the time of shipment.

Warranty

This Krohn-Hite Corporation product is warranted against defects in materials and workmanship for a period of one (1)
year from the date of shipment.

Service

For warranty or repair service, this product must be returned to a Krohn-Hite Corporation authorized service facility or
to Krohn-Hite directly. Contact must be made with Krohn-Hite Corporation or an authorized representative to receive a
Return Authorization before returning this product for repair.

Safety and Preparation for Use

Dangerous voltages, capable of causing injury or death, are present in this instrument.

Warning! Use extreme caution whenever the instrument covers are removed. Do not remove the covers while the
unit is plugged into a live outlet.

Line Voltage

The Model 7000 accommodates any voltage in the range 105Vac to 132Vac or 210Vac to 264Vac, with a frequency in
the range 50Hz to 60Hz.

Line Fuse

The line fuse is internal on the Model 7000 and may be accessed at the rear panel AC receptacle. The fuse is a 0.2A
slow-blow.

Line Cord

The Model 7000 has a detachable, three-wire power cord for connection to the power source and to a protective
ground. The exposed metal parts of the instrument are connected to the outlet ground to protect against electrical
shock. Always use an outlet which has a properly connected protective ground.

Service

Do not attempt to service or adjust this instrument unless another person, capable of providing first aid or
resuscitation, is present. Do not install substitute parts or perform any unauthorized modifications to this instrument.
Contact the factory for instructions on how to return the instrument for authorized service and adjustment. The Model
7000 is not intended for hot-swapping applications. Be certain to switch power off before inserting or removing plug-in
cards in the chassis.

4