Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-53
H Press the side-menu button Odd.
H Rotate the horizontal POSITION control counter clockwise and
align the trigger “T” to center screen
H Press the main-menu button TV Delay Mode.
H Press the side-menu button Line.
H Use the General Purpose knob to set the line count to 10.
H CHECK that the selected line is the first line that has the color
burst signal.
e. Check sync trigger:
H Using the Vertical POSITION knob, move the video waveform
from the top to the bottom of the display.
H CHECK that the TRIG’D LED stays on and the waveform is stable.
H Using the Vertical POSITION knob return the waveform to the
centerofthedisplay.
3. Disconnect the hookup: Disconnect the cable from the generator output at
the input connector of CH 1.
Output Signal Check
The procedure that follows checks the characteristics of the probe compensation
signal that are listed as checked under Warranted Characteristics in Chapter 1,
Specification.
Equipment
Required
One standard-accessory 10X probe (Item 17)
Prerequisites See page 4--15. Also, this digitizing oscilloscope must have passed
Check Accuracy — Long-Term Sample Rate, Delay time, and Delta
Time Measurements on page 4--34, and Check DC Voltage
Measurement Accuracy (Averaged) on page 4--22.
1. Install the test hookup and preset the oscilloscope controls:
a. Hook up test signal: Install the standard-accessory probe on CH 1.
Connect the probe tip to PROBE ADJ on the front panel; leave the
probe ground unconnected (see Figure 4--21).
Check Probe Adjust
Output
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