AM Gain

This calibration adjusts the gain of the AM circuitry to provide a 6.02 dB drop at 50% depth for a -1 volt input signal. The AM Input path comprises the 2X amplifiers on the reference board, the AM multiplexers, the AM DACs, associated op amps and the log converter on the output board.

The calibration is accomplished by setting the power to ”middle” vernier, setting the frequency to 800 MHz in low band (<=4 Ghz), 5.5 GHz in high band, and connecting a negative one volt signal to the input. AM is enabled and the AM DACs are adjusted for an exact 6.02 dB drop. The resulting value is transformed to a gain cal constant and stored as a calibration array.

Required Test Equipment

Test Equipment	Recommended Model	Alternate Model
Power Meter	N1914B	N1914A¹ N1913A N1913B E4418A E4418B E4419A E4419B
Power Sensor	N8482A	E9304A E9304A H18 N8482A CFT 8482A²
Function Generator	33622A	33611A 33612A 33621A 33250A 33120A Opt 001
Digital Multimeter	3458A Opt 002	34470A

Power meter N1914A with serial numbers ranging between MY00000000—MY53040007 require Service Note 07 to be applied for measurement repeatability. Please have this service note applied or verify it was applied before using this power meter. The affected service note is N1914A-07.
Not allowed for the following product configurations:
- E4438C with Option 506
- E4428C with Option 506
The dynamic frequency range of this sensor is insufficient for these models.

Connections and Setup Procedures

All test equipment requires a 30 minute warmup period to ensure accurate performance.
In the following adjustment setup, cables are designated as solid lines and direct connections are designated as dashed lines.

Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this adjustment, follow all instructions on the controller display.

Power Meter and Power Sensor Calibration

EXT1 Setup

EXT2 Setup

In Case of Difficulty

If this adjustment fails, perform the following steps in order:

Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the adjustment.
If this adjustment fails with the equipment set up properly, refer to the troubleshooting section of the signal generator's service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or on the Keysight Website.
If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.