401B04 ICP
®
Sensor Simulator
1. INTRODUCTION AND DESCRIPTION
The Model 401B04 is a unity gain, non-inverting, impedance-converting voltage amplifier with the same
characteristics as the built-in ICP
®
amplifiers provided in most PCB pressure sensors, force sensors, and
accelerometers. This model consists of MOSFET circuitry packaged in a convenient Pomona box with BNC
connectors. When used in conjunction with a signal generator or oscillator, it can be used in place of an ICP
sensor to calibrate ICP
®
sensor signal conditioners, do system verifications and gain adjustments, or check
frequency response of systems with long input cables. (The Model 401B04 simulates the circuit of an ICP
®
sensor while the signal generator takes the place of the sensor’s crystals.)
2. INSTALLATION AND OPERATION
CAUTION: Connect the output only to an ICP
®
type, current-limited signal conditioner.
WARNING: Excessive current may damage this model. Measure the ICP
®
sensor signal conditioner
current prior to connecting the 401B04. The ICP
®
excitation current should be
≤
20 mA.
2.1 CALIBRATION OF ICP
®
SENSOR SIGNAL CONDITIONERS
Refer to the acceptance test procedure for your particular PCB signal conditioner, dual mode charge
amplifier, or digital peak meter model. (Acceptance test procedures are available for most PCB electronic
products. Consult factory for details.)
Connect a signal generator or oscillator to the input jack of the 401B04, after observing the caution and
warning above. Connect the output jack of the 401B04 to the ICP
®
sensor signal conditioner being
tested. (Various cables and adaptors are available from PCB as needed.) Switch on the signal
conditioner and note the output bias voltage on the meter as you would for any ICP
®
sensor. The meter
should read mid scale, indicating that the 401B04 is operational. Follow the acceptance test procedure
for your particular PCB model. The exact gain factor (near unity) of the 401B04 is noted on the
calibration certificate supplied with the unit. The nominal value of Gain = 1.0 is on the housing of the unit.
401B04 Simulator
Frequency Counter
Function Generator
Digital Volt Meter
Oscilloscope
Signal Conditioner
(Unit Under Test)
401B04 Simulator
Frequency Counter
Function Generator
Digital Volt Meter
Oscilloscope
Signal Conditioner
(Unit Under Test)
401B04 Simulator
Frequency Counter
Function Generator
Digital Volt Meter
Oscilloscope
Signal Conditioner
(Unit Under Test)
