TB 9-6625-2114-35
Test instrument
Calibrator indications (V ac)
Adjustments
RANGE
Indications
switch settings
(V ac)
Min
Max
(R)
1.5 V
1.5
1.4550
1.5450
R5
5V
5
4.850
5.150
R7
15 V
15
14.550
15.450
R141
50 V
50
48.50
51.50
R14
150 V
150
145.50
154.50
R14
500 V
300
285.0
315.0
R14
1Adjust
R14 to provide the best overall compromise for RANGE switch 15 to 500 V ac settings.
b. Adjustments
(1) Adjust R31 (fig. 3) for 0 indication on TI (R).
(2) Fine adjust AC ZERO control for 0 indication on TI.
(3) Adjust calibrator for a 0.5 V indication.
(4) Adjust R3 (fig. 3) for a 0.5 V indication on TI (R).
a. Performance Check
(1) Set RANGE switch to .5V.
(2) Connect AC PROBE tip and ground clip lead together and adjust AC ZERO
for 0 indication on TI.
(3) Connect AC PROBE tip and ground clip lead to calibrator OUTPUT HI and
LO.
(4) Set calibrator output frequency to 400 Hz and amplitude for a .3 V ac
indication on TI.
(5) Press calibrator NEW REF key.
(6) Set calibrator frequency to 20 Hz. Using amplitude output adjustment
controls adjust calibrator amplitude for a .3 V ac indication on TI. Calibrator control
display Error will indicate within 10%.
(7) Repeat (6) above at 90 Hz.
(8) Repeat technique of (6) above at 1 kHz, 100 kHz and 1 MHz. Calibrator
control display Error will indicate within 2%.
(9) Adjust calibrator amplitude for a 0.00 ppm control display Error indication.
Set calibrator to STANDBY and disconnect from TI.
NOTE
If necessary, perform measuring receiver ZERO and
CALIBRATE.