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Fluke 8558A Manual

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Example 6
Measurement: Wait for the applied signal to fall below 12 V, then make a series
of measurements 3 times by delaying for 200 power-line cycles (PLC), followed
by making 10 measurements at intervals controlled by an external trigger signal,
for a total of 30 measurements.
Solution: Use the 10 V dc range. From defaults, in the Trigger Setup menu, set
the Trigger Event to External and the Triggers/Arm (Count) to 10. Under
Extended Settings, set the Arm1 Event to Line, the Arm1 Count to 3 and the
Arm1 Event Count (ECount) to 200. Set the Arm2 event to Internal, with a Level
threshold of 120% and negative slope. Apply an external signal of 5 V pk, 1 kHz
to the TRIG IN BNC. Apply 15 V dc to the 10 V dc range. Change the 15 V dc
input to 11 V dc. Three groups of 10 readings are made, with a delay between
each group of 10 readings, for a total of 30 readings. If you enable the Statistics
function (Analyze > Statistics), you can clearly see the reading count in groups of
10 readings, stopping at 30 readings.
This works by having the first layer (Arm2) wait for the signal to fall below the
threshold, after which the Arm1 layer will count 200 power line cycles before
allowing the Trigger layer to make the 10 externally controlled measurements.
The count of 3 in the Arm1 layer causes the 200 PLC delay and 10 reading
capture to occur three times. The triggering then stops because there was only
one occurrence of the Arm2 event (input falling to < 120% of range).
Example 7
Measurement: Measure the upper and lower levels of a continuous 1 Vpk 1 kHz
square wave accurately.
The ~500 μs duration of the levels makes it difficult to obtain an accurate, noise-
free measurement. There may be some overshoot and ringing after the edge. To
resolve this, the Product triggering can be set to make a number of
measurements at the topline and baseline of the square wave, using Statistics to
show the average of the 5000 readings. In this example, the triggering
subsystem is configured to detect an edge on the main analog input, wait 100 μs,
make a 200 μs aperture measurement, and repeat that process 5000 times to
give a combined measurement aperture of 1 second.
Solution: From defaults, push to stop readings. Set the Trigger Event
to Internal, positive going at 0 % of range, dc coupled, no filter. Set the
Triggers/Arm (Count) to 5000. Set the Trigger Delay to 100 μs. In the DCV
function, set the range to 1 V and the aperture to 200 μs under Measure Setup.
Push to capture the measurements. With the Statistics function enabled,
you can see the accumulation of the 5000 readings, and the average of these
readings (which is the topline of the square wave). To measure the lower level,
change the threshold polarity to negative in the Trigger Setup menu.
… 124 …


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