Tektronix TDS544A Manual do Utilizador descarregar pdf (Página 56)

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

Confirm the trigger system is within time-accuracy limits for pulse-glitch or

pulse-width triggering (horizontal scale >1

)

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.

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%.

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.

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Tektronix TDS544A Manual do Utilizador Página 56