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special considerations
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High source capacitance may degrade the performance of the differential charge amp (source
capacitance is the input capacitance defined as transducer capac cable capacitance). In
particular, noise may increase and high frequency response may decrease as source capacitance
increases.
Use with high temperature sensors
The differential 422 series have been specifically designed to operate with the lower insulation
resistance values which piezoelectric sensors may exhibit when subjected to very high temperatures
(generally greater than 500
°
F). Both units will operate with insulation resistances as low as 50k
Ω
.
Note: Because of its high sensitivity value, the 422M180 has a longer turn on time than typical charge
amplifiers designed for use with sensors with high insulation resistance. Consult the specifications for
details.
Caution! Excessive accumulated charges on the input cables can destroy the field effect transistor
(FET) in the amplifier. These charges can be grounded by shorting the center pin on the cable
connector plug to its knurled nut with any metallic object.
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Summary of Contents for 422M183
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