Agilent Technologies 856290216 service manual Frequency‘Response Adjustment

9.Frequency‘Response Adjustment

14.Add 67 to the 10 MHz RF gain DAC value and record as the 2 MHz RF gain DAC value.

2 MHz RF gain DAC value

15.Add 62 to the 10 MHz RF gain DAC value and record as the 6 MHz RF gain DAC value. 6 MHz RF gain DAC value

16.Press (ID until 2 MHz is displayed in the active function block. Use the DATA keys to enter the 2 MHz RF gain DAC value recorded in step 14.

17.Press @) until 6 MHz is displayed in the active function block. Use the DATA keys to enter the 6 MHz RF gain DAC value recorded in step 15.

18.Press NEXT BANI) on the HP 85623.

19.Disconnect the HP 8482A and its adapter from the HP 11667B. Connect the HP 8485A to the HP 8902A. Zero and calibrate the HP 8902A/HP 8485A combination. Connect the HP 8485A to the HP 11667B power splitter.

20.Enter the appropriate power sensor calibration factor into the HP 8902A.

21.Set the HP 8340A/B Icw) output to the frequency indicated in the active function area of the HP 85623 display.

22.Adjust the HP 8340A/B POWER LEVEL to place the signal midscreen on the HP 85623 display.

23.On the HP 85623, press PRESEL AUTO CTR.

24.Adjust the HP 8340A/B POWER LEVEL for a -10 dBm reading on the HP 8902A.

25.On the HP 85623, adjust the RF gain DAC value using the knob or keypad until the marker reads -10 dBm fO.10 dB.

26.On the HP 85623, press m to proceed to the next frequency.

27.Repeat steps 20 through 26 for the remaining frequencies in band 1.

28.On the HP 85623, press NEXT BAND to proceed to band 2.

29.Repeat steps 20 through 26 for the remaining frequencies in band 2.

30.Press PFW MENU STORE DATA ,then YES on the HP 85623.

31.Place the WR PROT/WR ENA jumper on the A2 controller assembly in the WR PROT position.

2-46 Adjustment Procedures