DC FM Carrier Offset

(N5161A / N5162A /N5166B / N5171B / N5172B / N5181A / N5181B / N5182A / N5182B / N5182N Option UNT Only)

DC FM Carrier Offset is a measure of carrier-frequency shift due to residual DC on the EXT1 DC -coupled path when FM mode is selected. Any DC level in this path will cause a constant offset (deviation) in the CW frequency.

For this test, the signal generator is set to a selected carrier frequency and FM is enabled. The EXT 1 input is selected and left open. A specific value of FM deviation is selected and a DC FM calibration is executed.

For FM ON and FM OFF, the carrier frequency is measured with a frequency counter. Any shift in the carrier frequency must be due to a residual DC voltage somewhere in the EXT 1 input path.

Required Test Equipment

Test Equipment

Critical Specifications for This Test

Recommended Model

Alternate Models

Frequency Counter

Frequency Resolution ≥ 0.1 Hz at 1 GHz

53230A1 Opt 106 or 115

53132A Opt [050 or 124]

53131A Opt [050 or 124]
  1. As part of the connection checks, the 53230A frequency counter will—under normal conditions—briefly display the message: Error caused by remote command.

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following test setup, cables are designated as solid lines and direct connections are designated as dashed lines.
  1. Connect all test equipment as shown.
  2. Connect GPIB cables to all GPIB-controlled test equipment.
  3. While performing this test, follow all instructions on the controller display.

 

Recommended Test Setup

In Case of Difficulty

If this performance test fails, perform the following steps in order:

  1. Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the performance test.

  2. Refer to the troubleshooting section of the 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 search for your signal generator model number on the Keysight website.

  3. If necessary, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.