Bedienungsanleitung Fluke 8558A (Seite 124 von 134) (Englisch)

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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.

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