Tektronix TDS500C Manual do Utilizador descarregar pdf (Página 64)

Performance Tests

1–48

TDS 500C, TDS 600B & TDS 700C Performance Verification and Specifications

Set upper

and lower

limits that

ensure

triggering.

Then change

limits 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:

H Press the side-menu button Upper Limit. Use the keyboard to set

the upper limit to 4 s.

H Press the side-menu button Lower Limit. Use the keypad to set the

lower limit to 500 ns.

b. Display the test signal:

H Set the horizontal SCALE to 5 s.

H Set the output of the sine wave generator for a 250 kHz,

five-division sine wave on screen. Set the vertical SCALE to 20 mV

(the waveform will overdrive the display).

H Press SET LEVEL TO 50%.

c. Check against limits: Do the following subparts in the order listed.

H Press the side-menu button Lower Limit.

H Use the general purpose knob to increase Lower Limit readout until

triggering is lost.

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Tektronix TDS500C Manual do Utilizador Página 64