HP 8672S Operating And Service Manual page 54

Models 8672S/86720A Adjustment
5-6. LOW BAND ADJUSTMENTS (16 MHz to 2 GHz) (cont'd)
Procedure
28. Set the Signal Generator to 0 dBm and repeat steps 19 through 27 until less than
(cont'd)
±0.1 dBm improvement is obtained on each successive adjustment.
29. Press LOCAL on the FEU and verify the LOCAL indicator lights. Set the OUT¬
PUT VERNIER for a power reading of 0.5 dBm on the FEU front panel meter.
CAUTION
Do not adjust A10R109 (MW) completely CCWas this can cause damage
to transistor Qll.
30. Connect the voltmeter to A10TP7. Adjust A10R109 (MW) for a voltage reading of
0.0 ± 5 mVdc.
31. Connect the voltmeter to A10TP1. Adjust A10R32 (DRF) for a voltage reading of
3.0 Vdc ± 5 mVdc.
32. Verify the CW LED on the FEU is lit. Adjust the OUTPUT VERNIER for a 0 dBm
reading on the power meter. Record the output power (it should be very close to
zero).
_0 dBm
33. Press CW/PULSE and than Jl_ / _TL. Verify the PULSE and ~LT LEDs are lit.
34. Adjust A10R91 (DS/H) for the same power reading recorded in step 32 (±0.1 dBm).