Trigger Filter Check; Triggerbandwidth Check; External Trigger Check - Hameg HM1004 Service Manual

Now approximately 2 signal periods should be visible on the screen.
Press 1kHz/1MHz pushbutton (in!).
Set time base to 0.5µs position.
Check 1MHz calibrator signal.
Please note: Neither the calibrator frequency nor the pulse duty factor are specified.

32) Trigger Filter Check.

Set time base to 1ms/div.
Connect a 1kHz sinewave signal of 25mVpp amplitude to input CH I and check for full screen deflection.
Set input attenuator CH I to 50mV/div and check for 5mm display height.
Select trigger coupling AC, DC, HF and LF.
Except in HF trigger coupling condition, the signal must always trigger the oscilloscope.
Set time base to 20µs/div.
Set sinewave generator to 50kHz and 25mV output amplitude and check for 5mm display height.
Select trigger coupling from AC, DC, HF and LF.
Except in LF trigger coupling condition, the signal must always trigger the oscilloscope.

33) Triggerbandwidth Check.

Set time base to 50ns/div.
Connect a 200MHz sinewave signal to input CH I.
Adjust generator output for 5mm display height.
The signal must be triggered.

34) External Trigger Check.

Set time base to 20µs/div.
Set input attenuator CH I to 100mV/div.
Connect a 50 kHz sinewave signal via a 50Ω through terminator with an amplitude of
280mVpp (100mVrms) to input CH I and check for 2.8div display height.
Set trigger LEVEL to electrical midrange position.
Check that the trigger ("TR") LED is lit.
Press TRIG. SOURCE pushbutton (readout: TR: EXE ...).
The TRIG. LED now must be dark.
Remove signal cable from input CH I.
Connect the signal cable to the TRIG.EXT. socket.
Now the TRIG. LED must lit.
56 Subject to change without notice