Features and Functions 4
Keysight 34970A/34972A User’s Guide 107
Power failure
– When shipped from the factory, the instrument is configured to automatically
recall the power-down state when power is restored. In this configuration, the
instrument will automatically recall the instrument state at power-down and
resume a scan in progress. If you do not want the power-down state to be
recalled when power is restored, send the MEMory:STATe:RECall:AUTO
OFF command (also see the Utility menu); a Factory Reset (*RST command) is
then issued when power is restored.
– If the instrument is in the middle of a scan sweep when power fails, all
readings from that partially completed sweep will be discarded (a sweep is one
pass through the scan list). For example, assume that your scan list includes
four multiplexer channels and you want to sweep through the scan list three
times (see diagram). A power failure occurs after the second reading in the
third scan sweep. The instrument will discard the last two of the 10 readings
and will resume scanning at the beginning of the third scan sweep.
– If you remove a module or move a module to a different slot while power is off,
the scan will not resume when power is restored. No error is generated.
– If you replace a module with a module of the same type while power is off, the
instrument will continue scanning when power is restored. No error is
generated.
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