TB 9-6625-2020-35
Table 11. Ac Voltage - Continued
Test instrument
Calibrator
Test instrument
range
output settings
indications (V)
pushbuttons
Voltage
Min
Max
20 V
18
V
50 Hz
17.83
V
18.17
V
20 V
18
V
20 kHz
17.83
V
18.17
V
200 V
180
V
20 Hz
176.7
V
183.3
V
200 V
180
V
50 Hz
178.3
V
181.7
V
200 V
180
V
20 kHz
178.3
V
181.7
V
500 VAC
500
V
50 Hz
491
V
509
V
500 VAC
500
V
20 kHz
491
V
509
V
b. Adjustments
(1) Set calibrator to STANDBY and disconnect from TI.
(2) Short TI VOLTS/Ω and LOW.
(3) Press TI 200 mV range pushbutton. Adjust R1204 (fig. 2) until TI indicates
00.0.
(4) Remove short from VOLTS/Ω and LOW.
(5) Connect calibrator OUTPUT HI and LO to TI VOLTS/Ω and LOW.
(6) Press TI 2 V range pushbutton.
(7) Set calibrator for a 1.8 V, 100 Hz output.
Adjust R1108 (fig. 2) until TI
indicates 1.800 V (R).
(8) Press TI 20 V range pushbutton.
(9) Set calibrator for a 18 V, 10 kHz output.
Adjust C1215 (fig. 2) until TI
indicates 18.00 V (R).
20. Ac Decibels
a. Performance Check
(1) Position dBm/dBV jumper (fig. 2) in dBm position.
(2) Press TI VOLTS AC TRUE RMS, dB, and 200 V pushbuttons.
(3) Connect calibrator OUTPUT HI and LO to TI VOLTS/Ω and LOW.
(4) Set calibrator for a 77.46 V, 100 Hz output. If TI does not indicate between
+39.5 and +40.5, perform b below.
(5) Set calibrator for a 77.46 mV, 100 Hz output.
(6) Press TI 200 mV pushbutton. If TI does not indicate between 19.5 and 20.5,
perform b below.
(7) Set calibrator for a 0.7746 mV, 100 Hz output. If TI does not indicate between
59.5 and 60.5, perform b below.
