– For the INTernal source, the DMM is triggered when the input signal on the specified channel crosses the spe-
cified trigger level at the specified slope. INTernal source is only supported on the DMM Digitize data acquisition
mode.
– For the ALARm<n> source, the instrument is triggered each time a reading crosses an alarm limit on a channel.
See the OUTPut:ALARm<n>:SOURce command for more information. With this source, you can use the Monitor
mode (see ROUTe:MONitor:STATe command) to continuously take readings on a selected channel and wait for
an alarm on that channel. ALARm<n> source is not supported on the DMM Digitize data acquisition mode.
– For the TIMer source, you can control the trigger-to-trigger interval (in seconds) for measurements on the chan-
nels in the present scan list. Use the TRIGger:TIMer command to set the wait period. TIMer source is not sup-
ported on the DMM Digitize data acquisition mode.
– After selecting the trigger source, you must place the instrument in the "wait-for-trigger" state using the INITiate
or READ? command. A trigger will not be accepted from the selected trigger source until the instrument is in the
"wait-for-trigger" state.
– Although the TRIGger:SOURce command shares some of the same signals as the
ROUTe:CHANnel:ADVance:SOURce command (used for external scanning), they cannot be set to the same
source (except IMMediate). If you attempt to select the same source, an error is generated and the TRIGger-
:SOURce is reset to IMMediate.
– The CONFigure and MEASure? commands automatically set the trigger source to IMMediate.
– The instrument selects the immediate trigger source after a Factory Reset (*RST command). An Instrument Pre-
set (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the setting.
Keysight DAQ970A/DAQ973A Programming Guide 343
2 SCPI Programming
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