Fall Time Measurement - HP 1652B Getting Started Manual

Expanding the edge on the waveform will give more accurate results
because more data points on the rising edge will be displayed.
2. From the Waveforms menu select the Auto-Measure field. The
Risetime value is displayed in the Automatic Measurements
listing pop-up.
Notice that Period, Falltime, Freq, + Width, and -Width listings are
blank. Because only the rising edge of the waveform is displayed, there
is insufficient data at this time to make these measurements.
3. Select Done. You are now back to the Waveform menu.
Fall Time
Fall time is measured on the negative-going edge of the waveform and
Measurement
is the time it takes the waveform to transition between the 90% voltage
point and
10%
voltage point. You are currently displaying the
positive-going edge of the waveform, so you need to change it to the
negative-going edge.
4. Touch the TRIG key and toggle the Slope field in the Trigger
Specification menu to Negative. Notice the negative-going edge
of the waveform is now displayed as shown in figure 25-6.
5. Touch the Display key and select the Auto-Measure field in the
Waveforms menu. The Falltime value is now displayed in the
AutomaticMeasurement listing pop-up.
-_
i-l- Trigger
tlode [
Edge 1 Source
[CH]
Run mode (Repetl tive]
Level -1
Slope [ Negative 1 Fluto-Trig f%-]
s/Dlv
j] Delay
113.41
FIrmed
D&J 1-1
-250mV
Figure 25-6. Negitive Edge Of Waveform
Waveforms Menu
25-6
HP 16528/1653B
Front-Panel Reference