Unholtz Dickie Corp

Model D33 Signal Conditioner

The D33PM Series Signal Conditioner provides virtually all the standard features and many of the optional features of earlier single channel UD signal conditioners in a smaller chassis and at a lower total cost. Independent power supplies are used so that stand-alone operation, as well as multiple channel operation is possible. The power transformers are electro-statically and electro-magnetically shielded so that power frequency components are virtually absent in the output signals. Separable references for the input and output circuits allow an internal differential circuit to remove common mode ground voltages caused by grounding the transducer case at the point of measurement.

Download Instrumentation Bulletins

Overview

  • .5 Digit LED meter for displaying peak sine and TRMS
  • Operates with piezo accelerometers, remote charge pre-amps, single strain gages and self-amplified accelerometers
  • Switchable 10, 100 mV/g (or mV/U) output for controllers
  • Switchable four pole filtering
  • Dial-A-Gain input sensitivity normalization
  • High output current
  • Low cost per channel

Front panel push-button controls and signal circuitry are contained on two printed circuit cards, which reduces internal wiring greatly and contributes to overall simplicity in layout.

Dial-A-Gain input sensitivity normalization, originated by UD, allows all outputs to be normalized for transducer sensitivities from 0.3 to 100 mV/unit, or pC/unit.

High frequency performance and slew rate performance have been improved to provide accurate high frequency shock measurements. Low frequency performance has also been improved to allow accurate measurements of classical shock tests. The droop in the measurement of the peak value of a 40 ms half-sine shock pulse is typically 5%.

Input signals are accepted by direct connection from piezoelectric accelerometers of force gages, or from accelerometers with internal amplifiers requiring two-wire constant current power source. The adjustable constant current source can also be used for exciting a single strain gage used for AC measurements.

Specifications

General

Enclosed modules with separate power supplies and rear mounted connectors.

Inputs

Outputs

Input Sensitivity Normalization

Provided by a range switch (10 or 100 mV-pC/g max) and a precision 10 turn dial (actual ranges are 0.3 to 10.3 and 3 to 103 pC-mV/g). For dynamic (AC) strain gage inputs, input sensitivity is (gage factor) x (DC voltage across gage) in mV/1000µL.

Noise

Front Panel Controls

Physical