Chapter 6 - Operation
UNITROL 1020 User Manual 3BHS335648 E82 125
The temporal buffer of the UN1020 can be used for troubleshooting by allowing retrieval of
data history recorded during the AVR operation time. As long as the CMT1000 is Offline,
the cursor A can be used to observe measurements and data stored on the temporary
buffer but on the Instrument windows. When instruments such as Measurements, Setpoint
Adjust, PQ Monitor and/or others are open when the cursor A is displaced along a curve in
the Oscilloscope window, the Instruments will show measurements reading from the AVR
at the time the temporal buffer was recorded (Figure 6-22). This additional information is
also stored in the temporary buffer but (some of them) are not shown in the Oscilloscope
window.
Notice that the cursors moved along the temporary buffer will show historical data on the
Instrument only if the CMT1000 is Offline; otherwise the Instruments show actual
measurements and reading from the AVR (and the system).
Figure 6-22 Evaluation of a waveform
A feature called Sweep Buffer can be used to displace the cursor A along the transient
curve at real time speed, and so, to observe the variations of measurements and data as
they might have been gathered during operation of the AVR.
When Sweep Buffer is enabled from the menu, a vertical line replaces the pointer A and
runs along the transient curve starting from the cursor A until the end of the transient at
real time speed (i.e. one second of cursor movement is equal to one second of operation
with the AVR). During the time the vertical line runs, the instantaneous value of the curve
is displayed on the Oscilloscope window, under the cursor A information. If an Instrument
window is opened during this process, the instantaneous data is also updated and shown
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