TB 9-4920-359-35
Test instrument
FIELD AMPS
Calibrator Indications (A dc)
meter indications
(A dc)
Min
Max
3
2.8
3.2
5
4.8
5.2
b. Adjustments. No adjustments can be made.
12. Timer Time Delay
a. Performance Check
(1) Connect dc power supply (+) to TI J1 pin J and (-) to pin S. Set dc power supply
ON and adjust for 28 V dc output.
NOTE
Use multimeter to set voltage and then disconnect multimeter
from dc power supply. Set dc power supply to OFF instead of
adjusting output to minimum when directed. This eliminates
the need to readjust to proper voltages when turned on again in
later checks.
CAUTION
Be aware that high voltage pulses are measured in the
following checks.
Ensure that proper frequency counter
settings are utilized.
(2) Connect frequency counter A input to J2 TRIG and B input to J4 T2 CAL.
(3) Position frequency counter controls to preset settings except as listed in (a)
through (i) below for time interval measurement:
(a) Function to TIME A - B.
(b) Press MEASUREMENT TIME and set to minimum (80 nsec).
(c) Press MEASUREMENT SINGLE (SINGLE appears in display).
(d) Set INPUT A and INPUT B 50Ω/1MΩ to 1MΩ.
(e) Press TRIGGER LEVEL AUTO key to deactivate auto trigger (AUTO
removed from display).
(f) Set INPUT A and INPUT B 1X/10X to 10X.
(g) Set INPUT A and INPUT B TRIGGER LEVEL SET A and SET B levels
to 8.00 V.
NOTE
At the time of dynamic evaluation, this manually set trigger
level was utilized to achieve correct readings from TI. These
manually set levels may have to be varied to obtain an in-
tolerance condition on pulse readings.
(h) Set INPUT A and INPUT B AC/DC to DC.
