Trigger Sensitivity Via Ch1, Ch2, Ch3 And Ch4 (Ext) - Fluke Autoranging CombiScope PM3370B Service Manual
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Also See for Autoranging CombiScope PM3370B:
- User manual (297 pages) ,
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PERFORMANCE TEST
6.3.35 MAIN TB triggering PM3370B/3380B/3384B; 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
and PM3380B, 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)
Test set-up:
Settings/procedure and requirements:
1 -
Apply a 50 MHz (30 MHz) sine-wave signal of 1 V(pp into 50Ω) to input CH1.
2 -
Press the AUTOSET key and set CH1 to 0.5V/div.
3 -
Use a 50Ω termination.
4 -
Set the input coupling of CH1 to DC and POSition the signal in the vertical center of screen.
5 -
Select 'trig' from the menu under the TB MODE menu key.
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.
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