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Performance Tests
Performance Verification Procedures
First, the upper and lower
limits are set so the test
waveform triggers within limits.
Second, a limit (here, the lower
limit) is increased until triggering
stops.
Figure 1-15: Measurement of Time Accuracy for Pulse and Glitch Triggering
3.
Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (horizontal scale >1
s
)
:
a.
Set upper and lower limits that ensure triggering at 250 kHz:
Press the side-menu button Upper Limit. Use the keyboard to
set the upper limit to 4 s.
Press the side-menu button Lower Limit. Use the keypad to set
the lower limit to 500 ns.
b.
Display the test signal:
Set the horizontal SCALE to 5 s.
Set the output of the sine-wave generator for a 250 kHz, five-divi-
sion sine wave on screen. Set the vertical SCALE to 20 mV (the
waveform will overdrive the display).
Press SET LEVEL TO 50%.
c.
Check against limits:
Do the following subparts in the order listed.
Use the general purpose knob to
increase
Lower Limit readout
until triggering is lost.
CHECK that the Lower Limit readout is within 1 s to 3 s,
inclusive.
Use the keypad to return the Lower Limit to 500 ns and reestab-
lish triggering.