4 - 44
PERFORMANCE TEST
14 -
Decrease the amplitude of the input signal.
15 -
Verify that the DEL’D TB is well triggered at signal amplitudes of
0.6 divisions and more.
16 -
Decrease the input frequency to 50 kHz. Set the MAIN TB to
50.0
µ
s/division and DEL’D TB to 20.0
µ
s/division.
17 -
Verify that the DEL’D TB stays well triggered at signal amplitudes of
0.6 divisions and more.
18 -
Increase the input frequency to 200 MHz.
19 -
Increase the input voltage to 1.2 division.
20 -
Operate the
∆
control (controls DEL’D TB trigger level).
21 -
Verify that the DEL’D TB is well triggered at all amplitudes of 1.2 divisions
or more.
22 -
Apply a 300 MHz sine-wave signal of 2V (pp into 50 ohm) from the SG504
generator to input CH1.
23 -
Adjust the input voltage to 2 divisions. Signal must be in vertical center of
screen.
24 -
Verify that the DEL’D TB is well triggered at signal amplitudes of 2 divisions
and more: adjust the
∆
control (DEL’D TB trigger level) if necessary.
PM3394B: repeat the procedure for CH2, CH3 and CH4 for the frequencies
50 kHz (0.6 division input signal) and 300 MHz (2 division input signal).
PM3390B: repeat the procedure for CH2 and the EXTTRIG input for the
frequencies 50 kHz (0.6 division input signal) and 300 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.
Then press the ANALOG key (’ANALOG MODE’ is displayed briefly) to return to
analog mode.
4.3.38
DEL’D TB triggering PM3370B/80B/84B; trigger sensitivity via CH1,
CH2, CH3 and CH4 (EXT).
The trigger sensitivity depends on the amplitude and frequency of the trigger
signal. In this test the main timebase trigger sensitivity via the CH1, CH2, CH3
and CH4 inputs is checked. For PM3370B/80B, this is checked for CH1, CH2 and
the EXTernal TRIGger input. For PM3370B; frequency setting between ().
Test equipment:
Fluke 5500A mode: levsine (Alternative: constant amplitude sine wave generator
SG 503)