TB 9-4931-533-40
(6) Press MEASUREMENT - ON pushbutton. TI display will indicate the
measured insertion loss (dB) maximum uncertainty as listed in test report for the
attenuator.
NOTE
Small fluctuations in RF power level set in (3) above will
cause out-of-tolerance reading.
(7) Repeat (5) and (6) above substituting 20 and 30 dB attenuator.
(8) Repeat (1) through (4) above changing RESOLUTION to .1 dB.
(9) Press MEASUREMENT STOP pushbutton. Connect variable attenuator and
30 dB attenuator in series and connect combination in attenuator insertion point (fig. 3).
(10) Set variable attenuator to 0.0 DB. Press MEASUREMENT ON and observe TI
VM-4A LOCKED light is on.
(11) Increase variable attenuator setting in 1 dB steps until VM-4A LOCKED light
starts blinking, then decrease setting until light remains on.
(12) TI display reading must be greater than 60 dB (55 dB at frequencies above 9 GHz).
(13) Repeat (1) through (12) above at frequencies of 1.5, 3.0, 5.6, 9.7, 11.0, 15.0 and
17 GHz. Substitute high band probes for low band probes and signal generator No. 2 for
signal generator No. 1 at frequencies above 2 GHz.
b. Adjustments. No adjustments can be made.
11. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
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