HP 431B Calibration Procedure page 14

TB 9-6625-086-35
(4) Set the TI MOUNT RES switch to agree with the thermistor mount (A8) being
used.
(5) Set the TI RANGE switch to .01 MW and null and zero the meter.
(6) Adjust dc power supply (A2) for a full-scale (.01 mw) indication on the TI. If dc
voltmeter (A3) indication is not within the limits specified in table 5, perform b below.
Figure 4. Range and tracking check without power meter calibrator.
Table 5. Range and tracking Performance Check (Without Power Meter Calibrator)
Test Test
Instrument Instrument
Switch Indication
Settings
.01 .01
.03 .03
.1 .1
.3 .3
1 1
10
Dc Voltmeter Indications (vdc) (Readings
for Model 431B are in Parenthesis)
200-Ohm Mount
Min Max
.438 .456
(.434) (.460)
.763 .787
(.752) (.798)
1.40 1.42
(1.37) (1.45)
2.43 2.47
(2.38) (2.52)
4.43 4.51
(4.34) (4.60)
100-Ohm Mount
Min Max
.619 .645
(.613) (.651)
1.08 1.12
(1.06) (1.13)
1.98 2.02
(1.94) (2.06)
3.43 3.49
(3.36) (3.56)
6.26 6.38
(6.13) (6.51)
Adjustments for Model
431C (fig. 3)
200-Ohm 100-Ohm
Mount Mount
R14 R1
R13 R2
R12 R3
R11 R4
R10 R5