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Comments • Executable when initiated: No
• Coupled Command: This command is coupled to the TRIGger:STARt:TIMer2
command and TRIGger:STARt:SOURce command as noted below:
Unless TRIGger:STARt:SOURce is DTIMer, the settings of
TRIGger:STARt:TIMer1 and TRIGger:STARt:TIMer2 are not coupled, and
changing one will not affect the setting of the other.
If TRIGger:STARt:SOURce is DTIM, then both TRIGger:STARt:TIMer1
and TRIGger:STARt:TIMer2 are used, and there is a coupling between the
two settings. The relationship between the two settings is such that one of
these two values must be exactly one reference oscillator period and the
other must be a multiple (greater than 1.0) of the reference oscillator period.
A record is kept of which setting was changed the most recently, and that
setting (TRIGger:STARt:TIMer1 or TRIGger:STARt:TIMer2) is assumed to
be the desired setting. For example, consider a reference oscillator period of
1
µs; if TRIGger:STARt:TIMer2 was last changed to a value of 1µs while
TRIGger:STARt:SOUR was set to DTIM, and the TRIGger:STARt:TIMer1
setting was also 1
µs, TRIGger:STARt:TIMer1 would be changed to 2µs (the
multiple 2.0 was chosen arbitrarily) so that both settings are not 1.0 times the
reference period. Similarly, if TRIGger:STARt:TIMer2 were set to 4
µs, and
TRIGger:STARt:TIMer1 was some value greater than 1
µs (like 2µs),
TRIGger:STARt:TIMer1 would be automatically changed to1
µs so that one
of the two values is 1.0 times the reference period.
• If dual rate sampling is enabled (TRIGger:STARt:SOUR is DTIM), then the
sample period specified by TIMer1 will be the sample rate for the pre-arm
readings of the dual rate measurement, and TRIGger:STARt:TIMer2 will be the
post-arm sample rate.
• If TRIGger:STARt:SOUR is TIMer, then only the sample rate specified by
TIMer1 is used.
• Note that it is only necessary to set the longest sample rate if
TRIGger:STARt:SOURce is DTIM. The other setting will be automatically
forced to be one reference oscillator period due to the coupling between the two
rates when TRIGger:STARt:SOURce is DTIM.
• If TRIGger:STARt:SOUR is neither TIMer or DTIM, then the sample rates
specified by TRIGger:STARt:TIMer1 and TRIGger:STARt:TIMer2 are retained,
but are not used nor coupled to each other.
• If the HP E1429 can not sample within 1 percent of the period specified by
TRIGger:STARt:TIMer1, then the TIME bit (bit 2) in the QUEStionable Status
register is set.
TRIGger[:STARt]:TIMer[1]
TRIGger Subsystem Command Reference 279