User`s guide

Return Format
The query command returns the sample interval in seconds. If you include
MIN or MAX in the query, the returned value is the minimum or maximum
recommended interval (for this command only) for the current
measurement.
The value returned by SAMPle:TIMer? MIN is affected by operations such as
autorange, offset compensation (for resistance or temperature), and 100
PLC integration times, which require additional time.
If autorange and offset compensation are turned off, and the integration
time is not 100 PLC, the value returned will be an accurate recommended
minimum value for the <interval> parameter.
If autorange or offset compensation are turned on, or the integration time
is 100 PLC, the value returned by SAMPle:TIMer? MIN will be a "worst
case" value. You may find that you can use a smaller <interval> than
recommended, but it is not possible to predict the exact amount of
additional time required. If you use an <interval> that is less than MIN,
check the Sample Timing Violation bit (bit 2) in the Questionable Data
Event Register using the STATus:QUEStionable[:EVENt]? command. If a
Sample Timing Violation event has occurred, the sample timing may not be
valid.