Krohn-Hite FMB3002 User manual

Model FMB3002
2 Channel Filter/Amplifier
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.

2 Channel, AC/DC Powered
Filter/Amplifier Module Box
OPERATING MANUAL
Unit 4, 15 Jonathan Drive, Brockton, MA 02301-5566
Tel: [phone]; Fax: [phone]
E-mail: [e-mail]; Web: www.krohn-hite.com
V2.1 Dated: 6-30-11
Copyright © 2011 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.

TABLE OF CONTENTS
1.0 GENERAL DESCRIPTION ................................................................................................................ 1
1.1 Description ............................................................................................................................ 1
AC/Battery Power.................................................................................................................. 1
Differential and Single-ended Operation............................................................................... 1
Battery Powered.................................................................................................................... 1
Applications........................................................................................................................... 1
1.2 Specifications ........................................................................................................................ 2
1.2.1 Filter Module Characteristics ................................................................................... 2
1.2.2 Input Amplifier Characteristics ................................................................................. 2
1.2.2.1 Single-Ended Input .................................................................................... 2
1.2.2.2 Differential Input......................................................................................... 2
1.2.3 Output Amplifier Characteristics .............................................................................. 3
1.2.4 General .................................................................................................................... 3
1.2.5 Options ..................................................................................................................... 3
1.2.6 Accessories.............................................................................................................. 4
2.0 OPERATION ...................................................................................................................................... 7
2.1 Introduction ........................................................................................................................... 7
2.2 Power Requirements............................................................................................................. 7
2.3 Turn-on Procedure ................................................................................................................ 7
2.3.1 AC Operation (FMB3002AC) ................................................................................... 7
2.3.2 DC Operation (FMB3002DC)................................................................................... 7
2.3.3 Battery Operation ..................................................................................................... 8
2.4 Front Panel Controls and Connections ................................................................................. 8
2.4.1 Active LED ............................................................................................................... 9
2.4.2 Input BNC Connectors ............................................................................................. 9
2.4.3 3-Terminal Connectors ............................................................................................ 9
2.4.4 Input DC Offset Adjust ............................................................................................. 9
2.4.5 Output DC Offset Adjust .......................................................................................... 9
2.4.6 Power LED Indicator ................................................................................................ 9
2.4.7 G1, Optional Input Gain Switch................................................................................ 9
2.4.8 G2, Optional Output Gain Switch............................................................................. 9
2.4.9 Output BNC Connector ............................................................................................ 9
2.4.10 Power Switch ........................................................................................................... 9
2.5 FMB3002AC Rear Panel....................................................................................................... 9
2.6 FMB3002DC Rear Panel ...................................................................................................... 9

2.7 Operation ...............................................................................................................................10
2.7.1 Input Single-Ended Operation ..................................................................................10
2.7.2 Input Differential Operation.......................................................................................11
2.7.3 DC Offset Adjust.......................................................................................................12
2.5.3.1 Single-Ended Input.....................................................................................12
2.5.3.2 Differential Input .........................................................................................12
2.7.4 Optional G1 and G2 Front Panel Gain Switches......................................................13
2.7.5 SE and DIFF Options ...............................................................................................13
Addendum .........................................................................................................................................14
Figure 1.1 Model FMB3002 Filter/Amplifier

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1
SECTION 1
GENERAL DESCRIPTION
1.1 DESCRIPTION
The Krohn-Hite Model FMB3002 is a two channel, compact filter chassis that provides housing for Krohn-Hite 3F
Fixed Frequency Filter/Amplifier Modules. The unit comes completely assembled from the factory with 3F customer
specified filter/amplifier module(s) installed in a one or two channel configuration. BNC (single-ended) or screw
terminal block (differential) input connectors, as well as BNC output connectors, are provided. Modules are factory
installed into sockets making updating to different type filter/amplifiers efficient and easy.
AC/BATTERY POWER
The FMB3002 is an ac powered chassis. A rear panel 3-terminal power receptacle is provided for attaching ac source.
An ac line switch provided for selecting the proper input line requirement of 120V and 240V. The FMB3002 is also a
battery operated chassis that can be powered by two 9V, high energy, lithium batteries. Battery life using the high
energy batteries is up to 8 hours when 2 filter modules are installed. Standard alkaline batteries can be used, but the
life is typically 2 hours.
DIFFERENTIAL AND SINGLE-ENDED OPERATION
The FMB3002 has front panel screw-terminals for applications requiring a differential input connection when working
with low level signals which may be ideal for improving the signal-to-noise ratio. This connection can also always be
used for single-ended operation by simply shorting the minus terminal to ground.
A BNC connection is also available for single-ended operation applications.
BATTERY POWERED
When the FMB3002AC or FMB3002DC is battery operated, two 9V, high energy, lithium batteries are required. High
energy batteries are recommended for extended operation. Battery life using the high energy batteries is up to 8 hours
when two 3F modules are installed. Standard alkaline battery life is typically 2 hours.
APPLICATIONS
Applications for the FMB3002 includes: anti-alias filtering, data acquisition systems, aerospace (sonar and
navigation), sound and vibration testing, medical electronics, communication systems, real and compressed time data
analysis, noise elimination and signal reconstruction and more.

Section 1 – General Desciption ------------------------------------------------------------------------------------------------------------
2
1.2 SPECIFICATIONS
Specifications apply at ±15Vdc or 120V/240V line unless otherwise noted.
Number of Channels: 1 or 2.
Power Supply Voltage (±Vs):
Operating Range: ±11Vdc to ±16Vdc.
Maximum Safe Voltage: ±18Vdc.
Note: Modules plugged into the FMB3002 chassis and the chassis has the Gain Option installed, must be of the same
input type configuration (differential or single-ended). They must not be mixed or the gain function will not work
correctly.
1.2.1 Filter Module Characteristics
The Filter Characteristics are defined by the module installed into the sockets of the FMB3002.
The specifications below apply to all modules that may be installed (specials may vary).
Functions (customer defined): Low-pass, high-pass or band-pass.
Number of Poles (slope, customer defined): 1 to 8 and 16-pole.
Type (customer defined): Butterworth or Bessel.
Cutoff Frequency (customer defined): Any specified fixed value between 1Hz to 1MHz, low-pass and band-pass;
1Hz to 600kHz, high-pass. Maximum frequency range is determined by maximum gain selected, consult factory for
further details for frequencies above 200kHz.
Passband Flatness: 10Hz to 200kHz, 0.2dB.
Relative Gain at fc: -3dB.
Noise (input shorted to ground and 300kHz bandwidth): 25μV rms typical, 50μV rms max referred to input.
Noise Spectral Density (100Hz to 300kHz): 40nV/√Hz typical, 100nV/√Hz max.
Signal-To-Noise Ratio (at 7V rms): >100dB.
1.2.2 Input Amplifier Characteristics
1.2.2.1 Single-Ended Input
Maximum Input: ±10V peak.
Coupling: DC.
Impedance: 1M ohm in parallel with a 50pF.
Gain (customer defined): Any fixed value from 1 (0dB0 to 100 (40dB), ±3% up to 200kHz. Consult factory for gain
bandwidth limitations above 200kHz.
Option G1 (input gain switch): Switch selectable, 0dB to 40dB in 10dB steps, ±3%. Custom values are
available. Maximum gain is determined by cutoff frequency. Consult factory for gain bandwidth limitations
above 200kHz.
1.2.2.2 Differential Input
In addition to the above specifications, use the following specifications for differential modules.
CMRR: >80dB to 1kHz.

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3
Maximum Common Mode Voltage: Equation to determine the max gain available for differential modules up to
200kHz.
For battery operation up to 200kHz, the maximum Common Mode Voltage is less than 9Vdc.
Consult factory for gain bandwidth limitations above 200kHz.
1.2.3 Output Amplifier Characteristics
Maximum Output Voltage: ±10V peak.
Maximum Output Voltage: 2Vp x (1MHz/f) for 1MHz.
Impedance: 50 ohms.
Gain (customer defined): Any fixed value 1 (0dB) to 100 (40dB), ±3%. Consult factory for gain bandwidth limitations
above 200kHz.
Option G2 (output gain switch): Switch selectable, 0dB to 16dB in 2dB steps and a final step of 20dB, ±3%.
Custom values are available. Maximum gain is determined by cutoff frequency. Consult factory for gain
bandwidth limitations above 200kHz.
Offset Voltage: Adjustable to zero.
1.2.4 General
Battery Powered Operation: Internal connectors are made available for battery power operation. Recommended
batteries are 9V high energy lithium batteries (8 hours) or 9V alkaline (2 hours).
Output Short Circuit Protection: Limited to short duration.
Operating Temperature Range: 0ºC to +50ºC.
Storage Temperature Range: -25ºC to +85ºC.
Dimensions: 8” (20.32cm) x 6.3” (16.02cm) x 2.5” (6.35cm).
Weights: 4 lbs (0.9kg).
1.2.5 Options
G1 (input gain control switch):
Switch selectable, 0dB to 40dB in 10dB steps, ±3% up to 200kHz. Custom values are available. Maximum gain
is determined by cutoff frequency. Consult factory for gain bandwidth limitations above 200kHz.
Note: Input type must be selected as differential or single-ended. Modules must not be mixed for gain control to
function properly.
G2 (output gain control switch):
Switch selectable, 0dB to 20dB in 2dB steps to 16dB and 20dB, ±3% up to 200kHz. Custom values are
available. Maximum gain is determined by cutoff frequency. Contact factory for gain bandwidth limitations above
200kHz. Note: Input type must be selected as differential or single-ended. Modules must not be mixed for gain
control to function properly.
SE (defined only when G1/G2 gain switch option is installed):
The SE (single-ended only) option must be specified when G1 and G2 gain switch option is installed. If a
differential filter/amplifier module is installed with the G1 and/or G2 option, the switched gain values will not be
correct.

Section 1 – General Desciption ------------------------------------------------------------------------------------------------------------
4
DIFF (defined only when G1/G2 gain switch option is installed):
The DIFF (differential only) option must be specified when G1 and G2 gain switch option is installed. If a single-
ended filter/amplifier module is installed with the G1 and/or G2 option, the switched gain values will not be
correct.
1.2.6 Accessories
3F Series (plug-in filter/amplifier modules)
Fixed frequency plug-in filter/amplifier module
for the FMB3002.
CON-045
Mating connector for differential input,
output and rear panel dc power (on
FMB3002DC only) connections.
HEBAT
High energy 9V lithium batteries.
CAB-018
Cable, BNC, 3’.
FUSE, Part No. 021033
Wickman Siemes 374, 0.125A,
slow-blow.