model flx-icp4 - Krohn
4-Channel Plug-In ICP Filter/Amplifier Carrier Card
for Piezoelectric Signal Conditioning
4-Channels per Card
Excitation Current: Selectable, 4mA/ 8mA
Excitation Voltage: 24Vdc
Differential Input for Improved Noise Rejection
Common Mode Rejection: >80dB.
Fixed Cutoff Frequency: Customer defined
from 1Hz to 200kHz
Gain: Customer defined 1 to 10,000
Plugs Into FLX-3006 Chassis
The Krohn-Hite Model FLX-ICP4 is a four-channel filter/amplifier Carrier Card is a flexible signal conditioning card
used in ICP sensor and other sensor/transducer applications requiring a constant excitation current. A user
selectable 4mA or 8mA constant current is provided for excitation power to the input of the ICP sensor, while the
return AC signal is conditioned through a differential fixed filter/amplifier.
The FLX-IPC4 can be populated with up to 4 independent channels, including a fixed low-pass Butterworth or
Bessel filtering from 1Hz to 200kHz and a fixed low noise gain up to 10,000. Filter and amplifier characteristics are
made to customer defined requirements which may be changed at a later time by replacing the filter/amplifier plugin module for each channel.
The FLX-ICP4 provides differential input configuration for improved noise rejection with a typical common-moderejection of >80dB and a signal-to-noise ratio of >100dB. Single-ended operation can be configured for simple input
applications. Typical noise is <10µV referred to the input.
The FLX-ICP4 is one of many plug-in cards available for the FLX-3007, 7-slot Chassis System.
Specifications apply at 25ºC, ±5ºC.
Number of Channels: Customer defined, 1 to 4.
Excitation Output
Voltage: 24V.
Current: 4mA or 8mA, -0% +20%, jumper selectable.
Filter Characteristics
Input Type (customer defined): Butterworth or Bessel.
Function: Low-pass.
Number of Poles (customer defined): 1 to 8.
Maximum Input: ±10V peak.
Coupling: AC, 0.8Hz.
Input Impedance: 150k ohm or greater.
Cutoff Frequency (customer defined): Any specified fixed between 1Hz to 200kHz. Maximum frequency
range is determined by gain selected, consult factory.
Passband Flatness: 10Hz to 200kHz, 0.2dB.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301 U.S.A.
Tel: 508-580-1660; Fax: 508-583-8989; email:
Page 1 of 2 - FLX-3006Data.doc Oct/2012 V2.2
Amplifier Characteristics
Maximum Output Voltage: ±10Vpeak.
Impedance: 50 ohms.
CMRR: typically >80dB to 1kHz.
Gain (customer defined): Any specified value 1-10,000, 3%.
Maximum Common Mode Voltage: (diff signal x gain) + (Vcm) < ±10V.
Output DC Offset Voltage: <1mV.
Noise (input shorted): 10µVrms typical, 20µVrms max referred to input.
Noise Spectral Density (100Hz to 300kHz): 40nV/√Hz typical, 100nV/√Hz max.
Signal-to-Noise (7Vrms): >100dB.
Power Consumption: -15V, 166ma; +15V, 225mA (4mA excitation), 250mA (8mA excitation). A maximum 5
ICP4 cards can be plug into the FLX-3006 Chassis.
Operating Temperature: 0ºC to +45ºC.
Storage Temperature: -25ºC to +70ºC.
Dimensions: 0.93” wide, 5” high, 10.5” deep.
Weight: 2 lbs.
Part No. CON-055: 8 pin, output mating screw-terminal block plug.
Part No. CON-056: 12 pin, input mating screw-terminal block plug.
Other FLX-3007 Chassis Family of Cards
Has a maximum 7-slots. Other family of
FLX cards available are:.
FLX-302: 2 Channel Differential
Filter/Amplifier Carrier Card.
FLX-303: 3 Channel Single-Ended Filter
Amplifier Carrier Card.
FLX-306: 6 Channel Differential/SingleEnded Filter/Amplifier Carrier Card.
FLX-700: High Gain Preamplifier Carrier
Specifications subject to change without notice.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301 U.S.A.
Tel: 508-580-1660; Fax: 508-583-8989; email:
Page 2 of 2 - FLX-3006Data.doc Oct/2012 V2.2
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