8. First LO Distribution Amplifier Adjustment
4. Set the HP 3456A controls as follows:
FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCVOLTS RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1OV RESOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lmV
5.Turn the HP 8560A m switch on.
6.Adjust A14R628 GATE BIAS for a DVM reading within 5% of the GATE BIAS voltage printed on the A7 LO Distribution Amplifier label.
7.Zero and calibrate the HP 8902A/HP 8485A in LOG mode (power levels read in dBm). Enter the power sensor 1 GHz Cal Factor into the HP 8902A.
8.Connect the power sensor to the 1ST LO OUTPUT on the HP 8560A.
9.On the HP 8560A, press (PRESET) (SPAN) ZERO SPAN (w) 1.0893 (GHz).
10.Connect the positive DVM lead to A14J18 pin 13.
11.Note the LO SENSE voltage printed on the A7 LODA label. Adjust A14R621 LO AMPTD until the DVM reads 6 mV more negative than the LO SENSE voltage printed on the A7 LODA label. For example, if the LO SENSE voltage is
12.Check that the HP 8902A power level reads greater than +15.2 dBm.
13.Disconnect the power sensor from the 1ST LO OUTPUT and reconnect the 5052 termination.
14.Disconnect the DVM leads from A14J18.
Adjustment Procedures