PERFORMANCE TEST
4 - 41
6
-
Press the TRIGGER menu key and select level-pp ’off’ and ’dc’ trigger
coupling from the TRIGGER MAIN TB menu
7
-
Adjust TRIGGER LEVEL for a correctly triggered display.
8
-
Decrease the amplitude of the input signal.
9
-
Verify that the signal is well-triggered at amplitudes of 0.6 divisions and
more.
10 -
Decrease the input frequency to 50 kHz.
11 -
Verify that the signal stays well-triggered at amplitudes of 0.6 divisions and
more.
12 -
Increase the input frequency to 100 MHz (60 MHz).
13 -
Increase the input voltage to 1.2 division.
14 -
Turn TRIGGER LEVEL.
15 -
Verify that the signal is well-triggered at amplitudes of 1.2 division and
more.
16 -
Increase the input frequency to 200 MHz (150 MHz).
17 -
Adjust the input voltage to 2 divisions. Signal must be in vertical center of
screen.
18 -
Verify that the signal is well-triggered at amplitudes of 2 divisions and
more; adjust TRIGGER LEVEL when necessary.
PM3384B: repeat the procedure for CH2, CH3 and CH4 for the frequencies
50 kHz (0.6 division input signal) and 200 MHz (2 division input signal).
PM3370B/80B: repeat the procedure for CH2 and the EXT TRIG input for the
frequencies 50 kHz (0.6 division input signal) and 200 MHz (150 MHz) (2 division
input signal).
Press the ANALOG key (’DIGITAL MODE’ is displayed briefly) and repeat the
tests in this chapter for the digital mode.
Press the ANALOG key (’ANALOG MODE is displayed briefly) to return to analog
mode.
4.3.36
MAIN TB/DEL’D TB triggering; trigger sensitivity TVL-TVF
This test checks the trigger sensitivity for television line- and field synchronization
pulses.
Test equipment:
TV pattern generator with video output (PM 5418)