TB 9-6625-2247-40
(34) Connect synthesized signal generator RF output cable to INPUT 1. RED LED
NOTE
If techniques (32) through (34) above fail,
repeat techniques (29) through (31) above.
11. Input 1 Sensitivity Test (18 to 40 GHz)
a. Performance Check
Figure 4. Sensitivity test (18 to 26.5 GHz) - equipment setup.
(2) Ensure AUTO key on FUNCTION DATA keyboard is pressed.
(3) Set variable attenuator No. 1 to 0 dB.
controls for a -10 dBm indication on power meter.
(5) Slowly increase variable attenuator No. 1 attenuation until TI loses stable count.
(6) Slowly decrease variable attenuator No. 1 attenuation until TI just begins to
indicate a stable count.
(7) Add 10 dB (directional coupler No. 1 coupling factor) to power meter indication.
Record sum.
(8) Subtract 0.5 dB (waveguide to coaxial adapter insertion loss (max)) from
variable attenuator No. 1 correction chart value. Record difference.
(9) Subtract difference recorded in technique (8) above from sum recorded in
technique (7) above. If the difference is not at least -25 dBm minimum, prepare a test
report using the actual sensitivity value for test frequency.