TB 9-4931-290-24
10. Dc Voltage
a. Performance Check
(1) Adjust decade resistor to 1 megohm (999.999 ohms on model 336) and connect
across TI output. This connection remains throughout the dc voltage check except where
instructed specifically to change.
(2) Connect multimeter to TI output.
(3) Set multimeter to measure dc volts.
(4) Position controls as listed in (a) through (c) below:
(a) MODE switch to DC POS.
(b) RANGE switch to 100 V.
(c) OUTPUT VOLTAGE controls to TEN0.00.
(5) Measure and record TI output for each RANGE listed in table 4.
Table 4. Dc Voltage
OUTPUT
Multimeter indications (V)
RANGE switch
Adjustments
VOLTAGE control
setting
Min
Max
setting
b(10) through (15)
100 v
TEN0.00
99.7929
100.2070
b(16) and (17)
10 v
TEN.000
9.97928
10.02073
b(18) and (19)
1v
.TEN000
.997905
1.00210
b(20) and (21)
100 mV
TEN0.00
.099768
.100232
b(22) and (23)
10 mV
TEN.000
.009954
.010046
b(24) and (25)
1 mV
.TEN000
.000973
.001027
(6) Analyze recorded indications. If all indications are within specified limits,
proceed to paragraph 11. If error is approximately the same magnitude and polarity on all
ranges, perform b (1) through (10) below. If error is only on individual ranges, perform
adjustments as specified in table 4.
b. Adjustments
(1) Set RANGE switch to 100 V and OUTPUT VOLTAGE controls to TEN0.00.
(2) Adjust R67 DC LEVEL (fig. 1 or 2) for a 100.0-V dc indication on multimeter (R).
(3) Set OUTPUT VOLTAGE controls to 10.00.
10.0 V dc indication on multimeter (R).
NOTE
Omit steps (5) through (9) for TI's with serial numbers below 900.
(5) Set MODE switch to DC NEG.
(6) Note multimeter indication and adjust R83 LIN BALANCE (fig. 1) to eliminate
half the error from 10 V (R).
(7) Adjust R85 DC LIN (fig. 1) for a 10 V indication on multimeter (R).
(8) Set MODE switch to DC POS.