– The pretrigger sample count must be less than the sample count set with the SAMPle:COUNt command, and
there must be at least one post-trigger sample: Pretrigger Sample Count ≤ Sample Count - 1
SAMPle:TIMer {<seconds> | MIN | MAX | DEF}
SAMPle:TIMer? [{MIN | MAX | DEF}]
Sets the sample interval when the sample count is greater than one for single channel DMM digitizing.
Parameter Typical return
<seconds> = 20 μs to 3600 s
MIN: 20 μs
MAX: 3600 s
DEF: 1 s
+1.00000000E+00
Sets the sample interval 100 seconds
SAMP:TIM 100
– The first sample is taken one trigger delay time after the trigger (delay set by TRIGger:DELay). The second sample
starts one sample interval after the start of the first sample, and so forth, as shown below:
– Note that the sample timing is determinant because the start of each sample is determined by the sample
interval. Integration and autoranging affect the sampling time for each sample, but not the sample interval as
long as the sample interval is longer than the sampling time. Periodic sampling continues until the sample count
(set with the SAMPle:COUNt command) is satisfied.
– The value of MIN is measurement dependent. It depends on such things as the integration time, autozero on or
off, and the measurement range. Basically, MIN is automatically determined so that the sample interval is always
greater than the sampling time (see above illustration). Execute SAMPle:TIMer? MIN to determine the
recommended interval for the current measurement configuration.
– Since the minimum value changes depending on configuration, a command order dependency exists. You must
completely configure the measurement before setting the sample timer to MIN, or you may generate an error.
– To determine the absolute minimum value for the present configuration, set the sample time to 20 μs (which
may generate a settings conflict error), then read back the current sample timer value using the SAMPle:TIMer?
query. The sample count must be greater than 1, for the settings conflict error to occur. The settings conflict
error causes the timer to be set to the absolute minimum value.
218
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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