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AGILENT 35670A
Supplemental Operator’s Guide
71
Section 26 : Running a Single Calibration Test on Command
The AGILENT 35670A automatically runs periodic self-calibration tests which
ensure that all measurements will meet published performance specifications. If a
calibration is desired at a specific time, then a single caibration may be performed as
follows:
• Press the [System Utility] hardkey.
• Press the [CALIBRATION] softkey (F2).
• Press the [SINGLE CAL] softkey (F3).
The calibration will start immediately and be completed in less than 15 seconds.
Section 27 : Returning the AGILENT 35670A to a Preset Condition
The AGILENT 35670A can generally return from an unknown state to a preset
condition by using the following command:
• Press the green [Preset] hardkey
• Press [DO PRESET] softkey (F1).
This does not turn off the analyzer, but it does stop data acquisition and reset most
measurement parameters. If the AGILENT 35670A is locked up due to a software
bug and no response can be generated by the Preset key, then a hard shutdown may
be required.
Section 28 : Precautions to Prevent Loss of Data
The most important aspect of preventing data loss with the AGILENT 35670A is to
avoid interrupting data acquisition. This can happen as easily as by tripping on the
power cord, but can also occur by accidentally re-starting a long measurement,
prematurely triggering an event, overloading the front ends, or unplugging
connectors.
Two situations call for careful planning and precautions: the first is when
frequencies are low and data acquisition times are very long, such as very low
frequency seismic testing. An interruption may waste hours of data acquisition. The
second situation worthy of precaution is when the test involves a one time event, like
the initial run-up of large machine during a plant re-start, or like a crash test, where
the test article is destroyed. In either case the data is valuable and care should be
taken to save it to disk before the data is lost by another measurement.
Manual arming along with a Channel 1 trigger and pre-trigger delay is the preferred
technique of acquiring transient crash tests. The pre-trigger delay ensures that the
entire transient event is captured even if the trigger is a little late. Manual arming
prevents re-triggering and loss of data if the transducer encounters a post-test bounce
or hit. Of course manual arming REQUIRES that the measurement be manually
armed before the test, otherwise the measurement will not be armed and data will be
missed.