HP 431B, Calibration Procedure

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TB 9-6625-086-35
10
(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 Dc Voltmeter Indications (vdc) (Readings Adjustments for Model
Instrument Instrument for Model 431B are in Parenthesis) 431C (fig. 3)
Switch Indication 200-Ohm Mount 100-Ohm Mount 200-Ohm 100-Ohm
Settings Min Max Min Max Mount Mount
.01 .01 .438
(.434)
.456
(.460)
.619
(.613)
.645
(.651)
R14 R1
.03 .03 .763
(.752)
.787
(.798)
1.08
(1.06)
1.12
(1.13)
R13 R2
.1 .1 1.40
(1.37)
1.42
(1.45)
1.98
(1.94)
2.02
(2.06)
R12 R3
.3 .3 2.43
(2.38)
2.47
(2.52)
3.43
(3.36)
3.49
(3.56)
R11 R4
1 1 4.43
(4.34)
4.51
(4.60)
6.26
(6.13)
6.38
(6.51)
R10 R5