8.1 Testing C.D. Powered Tachometers:
Do not exceed maximum input voltage
of the tachometer and observe proper polarity.
8.11
Place the TEST switch to the INSTRUMENT position and
the MEASUREMENT switch to PEAK VOLTS.
8.12
Set the output test voltage to be supplied to the tachometer
by adjusting the VOLTAGE SET potentiometer.
8.13
Place the MEASUREMENT switch to the MISSING
PULSE position. The ACCUTEK III will display “60” (Hz)
while the tachometer being tested should be functioning
and displaying a calibration R.P.M. on the tachometer.
Tachometers usually have a switch bank on the back which
determines the R.P.M. displayed for a given input frequency.
Verify that the displayed R.P.M. agrees with the manufactur-
er’s specs (at 60 Hz) for your switch setting. If the reading
disagrees with the manufacturer’s specs, recheck the switch
settings and input voltage before replacing the tachometer.
8.2 Testing other CD powered instruments:
Perform Step 8.11 to 8.13
In this case, the ACCUTEK III will only be providing power to the C.D.
powered instrument. The input signal (eg. thermocouple) to the device
under test must also be supplied to the instrument and must be verified
for proper operation as per instrument manufacturer’s instructions.
Devices that can be powered include most capacitive discharge powered
pyrometer heads, frequency counters, pressure indicators, timing indica-
tors and most other CD powered instruments.
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