Metrix HI 803 - Dynamic Sensitivity Test

Doc# 0296-0018 • REV R (July 2017) Page 51 of 61
FIG. 5-10 DISPLACEMENT PROBE MOUNTING FIXTURE WITH DIAL MICROMETER
Dynamic Sensivity Test
The test measures the sensivies of the displacement probe at the various gaps, typically; 30, 40, 50
and 60 mils.
Step 1. Turn on the Power Switch.
Step 2. Install the Target by screwing the target into the reference accelerometer unl it is nger ght.
Be sure to use the spanner wrench when installing.
Step 3. Install the displacement probe mounng xture onto the TTS and connect the displacement
probe system as shown in Chapter 3, Installaon, Displacement Probe, pg 3-5.
NOTE: Make sure the Displacement Probe system is a matched set consisng of a Probe, Oscillator/
Demodulator and interconnecng Cable.
Step 4. Install the Probe in the Mounng Fixture (See Fig. 5-10) and set the Probe Gap (distance from
the probe to the target), by reading the DC voltage output listed below. It is important to understand the
electrical gap and the mechanical are dierent. The Probe is encapsulated with protecve material and
epoxy. If a feeler gage is used to set the gap a dierent output voltage could be read.
• 30 Mils = 6 VDC Based on 200 mV/Mil
• 40 Mils = 8 VDC
• 50 Mils = 10 VDC
• 60 Mils = 12 VDC