Agilent Technologies Agilent 35670A manual Precautions to Prevent Loss of Data

AGILENT 35670A

Supplemental Operator’s Guide

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.

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