Agilent Technologies E1441A user service Duty Cycle Adjustment, AC Amplitude Flatness Adjustment

Duty Cycle Adjustment

The function generator stores two calibration constants related to squarewave offset and two calibration constants related to squarewave duty cycle. The constants are calculated from the adjustment value entered. The calibration constants are stored following completion of SETUP 63. No calibration constants are stored if the procedures are aborted at any other setup.

1.Use a DMM to measure the function generator DCV output voltage for SETUP 60 in the following table. These adjustments use a HIGH Z output termination.

Note For this test, the DMM must be set to a fixed range capable of measuring from +10 V to -10 V. Do not use an auto-ranging function for this test.

Table D-18. Duty Cycle Adjustment Setups

	Nominal	+
	Output
SETUP	FREQUENCY	AMPLITUDE
60	—	10.0 VDC	Positive squarewave offset.
61	—	-10.0 VDC	Negative squarewave offset.
62	300 Hz	0.0 VDC	50% duty cycle squarewave.
63	300 Hz	5.0 VDC	75% duty cycle squarewave

2.Send the CAL:VALue <measured Vdc> to the function generator.

3.Send the CAL? command to the function generator to initiate the calibration.

4.Repeat steps 1, 2 and 3 for SETUP 61 through 63.

5.Perform the “Square Wave Duty Cycle Verification” on page 172.

AC Amplitude Flatness Adjustment

The function generator stores eleven calibration constants related to AC Amplitude Flatness from 1 kHz to 15 MHz. The constants are calculated from the adjustment value entered and one of two calculation constants related to the type of measurement device you are using. The calibration constants are stored following completion of SETUP 82. No calibration constants are stored if the procedures are aborted at any other setup.

This procedure can be performed with one of three types of measurement device; a broadband ACrms voltmeter, a power meter, or a thermal voltage converter. The procedure differs slightly depending upon the type of measurement device used. These adjustments use a 50 Ω output termination.

Appendix D Service Procedures 185