HP 34970A Power Failure

Chapter 4 Features and Functions

Scanning

Sweep 1:

Sweep 2:

Sweep 3:

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.	4
	The instrument will discard the last two of the 10 readings and will
Power Fails
	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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