User Defined
You can set the unit of measure for the upper, middle, and lower thresholds
to either % (percent) or Volts. Percent is calculated from the top-base
values, and you can set the percent values from
−
25 percent to
+
125 percent
in 0.1 percent increments. Volts lets you set the thresholds to particular
voltage values regardless of the top-base values. You can set the voltage
values from
−
1.00 GV to
+
1.00 GV in increments determined by the voltage
range you are in. For example, if the upper threshold is set to 110
µ
V, you
can change the threshold in 1-
µ
V increments. However, if the threshold is
set to 110 MV, you can change the threshold in 1-MV increments.
The upper threshold value is always greater than the value of the middle
threshold, and the middle threshold value is always greater than the value of
the lower threshold. The oscilloscope will not allow a threshold to cross over
the adjacent threshold.
If the threshold you are using for the measurement is not positioned on the
waveform, then that threshold followed by a question mark is displayed in
place of the automatic measurement result.
When Units is set to Volts, user defined simplifies the threshold detection
algorithm. The result is that the measurement throughput of the oscilloscope
is increased, because the oscilloscope does not have to calculate the voltage
thresholds.
To use the markers to show the threshold setting
1 Press the blue shift key, press the More meas key on the keypad, press the
More meas softkey, select V upper, then press Enter.
2 Select the channel, function, or memory you are measuring, then press Enter.
3 Press the Define meas key. Then, set Thresholds to User defined.
As you adjust the Upper value, the marker gives you a visual indication of where
you are positioning the Upper value on the waveform. You can use this same
procedure to track the Middle and Lower threshold values.
If the marker value is much greater than the threshold value, the marker may be
clipped off the screen.
Define Measure Menu
Thresholds
7–5
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