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IM 2680/5 083119
19
6.1.3
2680 quick test
This section provides a method to perform a quick functional test using
common laboratory measurement equipment.
Equipment required:
•
28 volt power supply with an output mA meter
•
Digital storage oscilloscope
•
Digital multimeter
1
Apply 28 Volts between pins A (+) and D. and confirm that the
current is within the specifications in table 4.
2
Connect a 10k Ω (minimum) resistor between pins C and D.
3
With a DMM, measure the DC voltage across the 10k Ω resistor. The
voltage should read 2.50 VDC ±3%.
4
Connect a charge-mode piezoelectric accelerometer to the10-32
input connector using low-noise cable.
5
Connect an oscilloscope to either/or Pins B and D or C&D. AC
coupling is recommended if using pins C&D.
6
Tap the base of the accelerometer with a wooden pencil, or a plastic
screwdriver handle.
7
Look for an output response on the oscilloscope screen. Figure 11 is
an example of a response from a hard strike.
8
If a suitable response is observed on the oscilloscope, the test is
complete.
Figure 11: The left
side of the trace
shows the initial
strike followed by
the “ring” from
the accelerometers
resonance. Other
patterns are possible
from a “good” system.