TB 9-6625-086-24
11. Range and Tracking Check Without Power Calibrator
a.
Performance Check
(1)
Connect the equipment as shown in figure 3.
DC POWER SUPPLY
RESISTANCE STANDARD
Positive
Negative
DECADE RESISTOR
TEST INSTRUMENT
THERMISTOR MOUNT
DC CALIBRATION AND
50-OHM TERMINATION
SUBSTITUTION (REAR
PANEL)
Figure 3. Range and tracking check without power meter calibrator.
(2) Set decade resistor to 10 k . This 10 k
value can be decreased as necessary to
obtain full scale indication on TI.
(3) Set resistance standard to 1000 ohms.
(4) Set the TI MOUNT RES switch to agree with the thermistor mount
being used.
(5) Set the TI RANGE switch to .01 MW and null and zero the meter.
(6) Adjust dc power supply for a full-scale (0.01 mw) indication on the TI.
If
multimeter indication is not within the limits specified in table 4, perform b below.
Table 4. Range and tracking Performance Check (Without Power Meter Calibrator)
Test
Multimeter indications (Vdc)
Adjustments (fig. 3)
Test
instrument
200 ohm mount
100 ohm mount
instrument
200 ohm
100 ohm
switch
indication
mount
mount
Min
Max
Min
Max
settings
.01
.01
.438
.456
.619
.645
R14
R1
.03
.03
.763
.787
1.08
1.12
R13
R2
.1
.1
1.40
1.42
1.98
2.02
R12
R3
.3
.3
2.43
2.47
3.43
3.49
R11
R4
1
1
4.43
4.51
6.26
6.38
R10
R5