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PERFORMANCE TEST
4.3.40
Trigger sensitivity in logic mode PM3384B
The trigger sensitivity in the logic mode ’pattern’ depends on the amplitude and
frequency of the trigger signal. In this test, the trigger sensitivity is tested with a
sine wave via the CH1, CH2, CH3, and CH4 inputs.
Test equipment:
Fluke 5500A mode: levsine: (Alternative: constant amplitude sine wave generator
SG 503).
Test setup:
1
-
Press the ANALOG key (’DIGITAL MODE’ is displayed briefly) to activate
the digital mode.
2
-
Apply a 50 MHz sine-wave signal of 1 V(pp into 50 ohm) from the constant
amplitude sine-wave generator to input CH1.
3
-
Press the AUTOSET key, and set CH1 to 0.5V/division.
4
-
Use a 50 ohm termination.
5
-
Set the input coupling to DC and POSition the signal in the vertical center
of the screen.
6
-
Select 5.00 ns/division for MAIN TB.
7
-
Press the TRIGGER menu key and select ’logic’, ’pattern’, and ’enter’ from
the related menu.
8
-
Operate the front panel keys TRIG1, TRIG2, TRIG3 and TRIG4 to obtain
the trigger pattern Hxxx (x = don’t care) in the menu.
9
-
Press the TB MODE menu key and select ’trig’ from the related menu.
10 -
Decrease the amplitude of the generator voltage to 1 division.
11 -
Turn the TRIGGER LEVEL control and check that a well-triggered signal
is obtained.
12 -
Increase the input frequency to 200 MHz.
13 -
Increase the input voltage to 2 division.