TB 9-6625-2043-24
13. dBm Ranging (Model 42BD Only)
a. Performance Check
(1) Connect TI power detector to function/arbitrary generator Output.
(2) Set FULL SCALE range selector switch to 10 mW.
(3) Adjust function/arbitrary generator frequency control to 200 kHz and adjust
output for TI indication of 10 mW.
(4) Set OFF-PWR-dBm switch to dBm. If TI does not indicate between +9.8 and
+10.2 dBm, perform b (1) below.
(5) Reduce function/arbitrary generator output to minimum.
(6) Set FULL SCALE range selector switch to 100 nW and OFF-PWR-dBm switch
to PWR.
(7) Adjust function/arbitrary generator output for TI indication of 100 nW.
(8) Set OFF-PWR-dBm switch to dBm. If TI does not indicate between -39.7 and
-40.3 dBm, perform b (2) below.
(9) Set FULL SCALE range selector switch to 1 mW and OFF-PWR-dBm switch
to PWR.
(10) Adjust function/arbitrary generator output for a TI indication of 1.0 mW.
(11) Set OFF-PWR-dBm switch to dBm. If TI does not indicate between -0.2 and
+0.2 dBm, perform b (3) below. Record TI indication.
(12) Reduce function/arbitrary generator output by 10 dB. If TI does not indicate 10
0.2 dB difference from value recorded in (11) above, perform b (4) below.
b. Adjustments
(1) Adjust R610 (fig. 2) for a +10 dBm indication on TI meter (R).
(2) Adjust R624 (fig. 2) for a 40 dBm indication on TI meter (R).
(3) Adjust R610 (fig. 2) for a 0 dBm indication on TI meter (R).
(4) Adjust R616 (fig. 2) until TI indicates a 10 dB difference from value recorded in
a (11) above (R).
14. RF Calibration Accuracy
a. Performance Check
(1) Connect equipment as shown in figure 4.
