Tektronix TDS7054, Руководство по обслуживанию

Страница: 73 / 254

Brief Procedures
TDS7104 & TDS7054 Service Manual
4- 13
5. Verify that the delayed trigger system operates:
a. Set up the delayed trigger:
H
Pull down the Trig menu and select A — B Trigger Sequence. . . .
This displays the A
→
B Sequence tab of the trigger setup control
window.
H
Click the Trig After Time button under A Then B.
H
Click the B Trig Level control in the control window.
b. Confirm that the following statements are tru e:
H
The trigger-level readout for the B trigger system changes as you
turn the lower multipurpose knob.
H
As you rotate the lower multipurpose knob, the square-wave
probe-compensation signal can become triggered and untriggered.
(Leave the signal triggered.)
c. Verify the delayed trigger counter:
H
Double click the Trig Delay control to pop up a numeric keypad for
that control.
H
Click on the keypad to enter a trigger delay time of 1 second and
then click Enter .
H
Verify that the trigger READY indicator on the front panel flashes
about once every second as the waveform is updated on-screen.
6. Remove the test hookup: Disconnect the BNC cable from the channel input
and the probe compensation output.
Equipment
required One BNC cable, such as Tektronix part number 012-0076-00
One 720 K or 1.44 Mbyte, 3.5 inch DOS-compatible formatted disk.
Prerequisites None
1. Initialize the oscilloscope: Push the front-panel DEFAULT SETUP button.
2.
Hook up the signal source:
Connect the BNC cable from the probe com-
pensation output to the CH 1 input as shown in Figure 4--6.
Verify the File System