HP 8340B Manual page 204

5-15. ALC ADJUSTMENTS (Cont'd)
ADJUST AM OFFSET
27. Connect the Power Sensor to the OUT's RF OUTPUT. Press [INSTRPRESET]. Press [CW] and
enter [1] The power level should be 0 dBm. Disconnect any AM inputs. Access Calibration
[GHz].
Constant Number 43 by entering the following: [SHIFT][GHz][4] [3] [Hz] [SHIFT][MHz][1] [2]
[Hz] [SHIFT][kHz] [2] [2]
change in power meter indication when turning AM on then off.
AM GAIN ADJUSTMENT
28. Set up the following equipment as shown in Figure 5-50 with the power supply set to 0 Vdc. Allow
the equipment to warm up for at least 30 minutes.
DUT
29. Calibrate the power meter and then set the calibration factor switch for a 1.5 GHz measurement.
Connect the power sensor to the OUT's RF output.
30. Press the following key sequence on the OUT:
[INSTRPRESET]
[CW] [1] [5] [GHz]
[.]
[POWERLEVEL] [—] [5] [dBm]
[AM].
31. Adjust the power supply for 0 Vdc. Press dB [REF]on the power meter (the power meter will now
indicate the power level changes from this reference).
5-98 Adjustments
Adjust Calibration Constant Number 43 for no more than 0.05 dB
[Hz].
BNC
TEE
Figure 5-50. AM GAINAdjustment Test Setup
POWER METER
ADAPTER
APC—3.5(f)
to N(m)
HP 8340B/41B