Agilent Technologies Switch/Measure manual Signal is detected on ABus1

94-Channel Isolated D/A Converter with Waveform Memory Module

N O TE	The line between external Trigger Out and external Trigger In is
	shared. You can use the external Trigger Out to provide the external
	Trigger In signal. However, both a user-supplied external trigger and
	the 34951A Trigger Out cannot drive the line at the same time.

Auto- Calibration

The 34951A features auto- calibration (auto- cal). Upon receipt of the CALibration:MODule? command, you can adjust all four channels of the DAC module. The adjustments, performed under complete control of the 34980A, require approximately one minute per module.

WA RN I N G	Because the auto-cal uses the internal DMM, do not route signals
	on ABus1 when performing an auto-cal of a DAC module. Do not
	apply a signal to ABus1 via the Analog Bus connector on the rear
	of the mainframe (pins 4, 5, and 9). The auto-cal will abort if a
	signal is detected on ABus1.

Before performing an auto calibration, be sure to allow a one- hour warm- up of the DMM and 34951A module. The adjustment is valid for 90 days for temperatures within 5 oC of the auto- cal temperature. For the calibration constants to be saved, calibration security must be off. Otherwise, the new calibration constants can be used while power is on. But when power is lost, the DAC module will revert to using the previously stored calibration constants. For SCPI programming examples for the auto- cal, refer to page 191.

188 34980A User’s Guide