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Related Manuals for Krohn-Hite 7000
Summary of Contents for Krohn-Hite 7000
- Page 1 Model 7000 Low Noise Differential Preamplifier Operating Manual...
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Page 2: Service And Warranty
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. - Page 3 V1.1 Dated: 01/12 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.
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Page 4: Table Of Contents
TABLE OF CONTENTS SECTION 1 - GENERAL DESCRIPTION ......................5 INTRODUCTION ............................. 5 1.1.1 DESCRIPTION ........................... 5 1.1.2 APPLICATION ..........................5 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 .......................... - Page 5 COMMON MODE REJECTION ......................... 16 DISTORTION CHECK ............................16 AC/DC COUPLING CHECK ..........................17 Figure 1.1 - Model 7000 Low Noise Differential Preamplifier...
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Page 6: Safety And Preparation For Use
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. -
Page 7: Section 1 - General Description
FET instrumentation amplifier and an optional DC (RMS-to-DC converted) output. The Model 7000 has fixed gain settings of x1 (0dB), x10 (20dB), x100 (40dB) and x1000 (60dB) over a selectable bandwidths of 100Hz, 1kHz (HP), 3kHz, 30kHz, 100kHz and 1MHz (LP Off). Noise referred to input is 7nV√Hz and common mode rejection is >100dB at 1kHz. -
Page 8: Filters
1.2.2 FILTERS Filtering: Frequency limited by a switch selectable 12dB/octave filter, with -3dB points of 1kHz, high-pass and 100Hz, 3kHz, 30kHz, 100kHz, low-pass. LP OFF position to turn off low-pass filtering, bandwidth is 1MHz. Wideband Noise (Reffered to input, 2MHz Bandwidth Detector) FILTER OFF 100kHz GAIN... -
Page 9: Front Panel
40kHz 1.2.8 ACCESSORIES Rack Mount Kit: Part No. RK-39 permits the installation of the Model 7000 into a standard, 19" rack spacing. CAB-025: Cable, BNC, 3ft, Low Noise Extended 1 Year Warranty: Part No. EW7000. Specifications subject to change without notice. - Page 10 Notes ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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Page 11: Section 2 - Operation
(please remove the power line from the unit before changing the fuse). TURN-ON PROCEDURE The Model 7000 has been configured for 115V operation and is provided with an AC receptacle for AC line operation. Make sure the POWER switch is in the OFF position. -
Page 12: Replacing The Power Fuse
REPLACING THE POWER FUSE The top cover of the Model 7000 must be removed to replace the line fuse. Figure 2.1 below indicates where the fuse is located. The fuse is part number 021039, 0.2A. Warning! Remove the power cord before removing the top cover of the Model 7000. -
Page 13: Input Coupling
Each connector accepts a maximum of 10V input and provides an impedance of 1M ohm in parallel with a 40pF. The connector shields are isolated from chassis ground. 2.5.4 COUPLING There are two Input Coupling selections, AC and DC. Pushing the COUPLING button located in the INPUTS block on the front panel will switch between AC or DC input coupling. -
Page 14: Optional Rms-To-Dc Output
Pushing [LP FILTER ] when LP OFF is on will have no effect. Pushing [ LP FILTER] when 100 is on will have no effect. When pushing the 1K button, it toggles the 1kHz filter on and off. The LED below 1K on the panel will illuminate, indicating that the filter is active. -
Page 15: Section 3 - Incoming Acceptance
INCOMING ACCEPTANCE INTRODUCTION The following procedure should be used to verify that the Model 7000 preamplifier is operating within specifications. These checks may be used for incoming acceptance and periodic performance checks. Tests must be made with all covers in place and operating for a minimum of 30 minutes to reach operating temperature. -
Page 16: 3.5 Noise Check
Set the meter to read 0dB (dB and REL mode on the Fluke 8920). Connect the meter to the preamplifier’s output. Set the input gain to x 100 (40dB), the meter should read 39.7 to 40.3dB. Connect the meter to the preamplifier’s ‘+’input and set it to volts mode. Set the oscillator to about 10mVrms. -
Page 17: Ac/Dc Coupling Check
3.8 AC/DC COUPLING CHECK Apply a 1Vdc signal to the + INPUT of the preamplifier. Ground the – input of the preamplifier. Set the gain to 0dB. Set the 1 kHz high-pass filter to the off position. In the DC COUPLED mode, the OUTPUT of the preamplifier should be approximately 1Vdc and approximately 0Vdc in the AC COUPLED mode.