TB 9-4920-452-35
WARNING
Do not exceed maximum input VOLTAGE to frequency
counter. Ensure frequency counter CHANNEL A 50Ω/1 MΩ
switch is set to 1MΩ and CHECK/COMA/SEP switch is set to
SEP.
(3) Adjust calibrator for a 28 V output level and a frequency setting of 200 Hz as
indicated on TI frequency meter.
(4) Observe indication on frequency counter.
Frequency counter will indicate
between 196.5 and 203.5 Hz.
(5) Repeat (3) and (4) above while adjusting output frequency on calibrator as
indicated in table 3 and maintaining a voltage output level at 28 V. Frequency counter will
indicate within limits specified in table 5.
b. Adjustments. No adjustments can be made.
Table 5. Frequency Meter Accuracy
Calibrator
frequency (Hz)
setting as
indicated on
Frequency counter indications
test instrument
(Hz)
frequency meter
Min
Max
220
216.5
223.5
240
236.5
243.5
260
256.5
263.5
280
276.5
283.5
300
296.5
303.5
10. Pyrometer
a. Performance Check
(2) Set calibrator controls for a minimum output and resistance standard to 1.0Ω.
(3) With no voltage applied (momentarily disconnect one lead), set TI indication to
red line.
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