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Performance Tests

4- 104

CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual

H From the button bar touch Trig, select the A-- >B Seq tab, and touch

the A then B Trig After Time button.

H Select the BEventtab, and touch the Set 50% button.

H CHECK that a stable trigger is obtained for the test waveform for

both the positive and negative slopes of the waveform. Use the

TRIGGER LEVEL knob to stabilize the Main trigger. Touch B

Trig Level and use the keypad or the multipurpose knob/FINE

button to stabilize the Delayed trigger. Touch one of the Slope

buttons to switch between trigger slopes. See Figure 4--28 on

page 4--103.

H Leave the Delayed trigger system triggered on the positive slope of

the waveform before continuing to the next step. Also, return to the

main trigger: select the A-->B Seq tab and touch the A-->B Sequence

AOnlybutton. Then select the AEventtab.

H Press Close.

3. Confirm the AUX Trigger input (at 50 MHz):

a. Display the test signal:

H Remove the 10X attenuator and reconnect the cable to CH 1.

H Set the signal amplitude as follows:

CSA7404B 2.5 divisions

TDS7704B, CSA7404B, TDS7404B,

TDS7254B & TDS7154B 1.5 divisions

H Now fine adjust the generator output until the CH 1 Amplitude

readout indicates the amplitude is as follows (Readout may

fluctuate):

CSA7404B 250 mV

TDS7704B, CSA7404B, TDS7404B,

TDS7254B & TDS7154B 150 mV

b. Check the AUX trigger source for stable triggering at limits: Do the

following in the order listed.

H Use the definition for stable trigger from step 2b.

H Press the Trigger SOURCE button to toggle it to EXT.

H Press PUSH TO SET 50%.

H CHECK that a stable trigger is obtained for the test waveform on

both the positive and negative slopes. Press the Trigger SLOPE

Tektronix CSA7404B Service Manual

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