HP 34970A manual Y z v Qaa ywy y Ud EC7N5

Chapter 5 Remote Interface Reference

Scanning With an External Instrument

ROUTe

:CHANnel:ADVance:SOURce {EXTernalBUSIMMediate}

:CHANnel:ADVance:SOURce?

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Select the source to provide the channel advance signal to the next channel in the scan list. When the channel advance signal is received, the instrument opens the currently selected channel and closes the next channel in the scan list. The instrument will accept a software (bus) command, an immediate (continuous) scan trigger, an external TTL trigger pulse, or an internally-paced timer. The default is “EXTernal”. The :SOUR? query returns “EXT”, “BUS”, or “IMM”.

The channel advance signal is ignored unless you have initiated the scan (INITiate command) and have received a scan trigger (TRIG:SOUR command). Although the ROUT:CHAN:ADV:SOUR command shares some of the same signals as the TRIG:SOUR command, they cannot be set to the same source (except IMMediate). If you attempt to select the same source, an error is generated and the TRIG:SOUR is reset to IMMediate.

A channel advance signal is not required for digital input or totalizer channels included in the scan list. Measurements on these channels are still performed by the HP 34970A and do not require synchronization with the external instrument.

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