99
Subject to change without notice
MANUAL ADJUSTMENT PROCEDURE HM1508-2
– Press “User 1” function key.
– Turn INTENS knob counter clockwise for maximum negative threshold display of approx. -1.9 V.
– Check that CH 3 is displayed as a straight line showing high status.
– Turn INTENS knob clockwise so that the threshold negative voltage decreases and becomes positive.
– Check that above 0 Volt the status is displayed as – stable triggered – high and low states.
– Turn INTENS knob to increasing positive threshold voltage values until the status becomes continuously low
with threshold voltages above 2.5 Volts.
– Set oscilloscope to DIGITAL mode.
– Press (TRIGGER) MODE pushbutton and check that “Auto” and “Edge” triggering are selected.
– Press (TRIGGER) FILTER pushbutton and check that “Rising” Edge is selected.
– Press CH 3/4 pushbutton to call the “CH 3/4” menu.
– Press “Channels” (On Off) function key so that On is activated.
– Press “CH 3 CH 4” function key so that CH 4 is active (“CH 3 CH 4”).
– Press (TRIGGER) SOURCE to call “Trig. Source” menu.
– Press “CH 4” function key to select CH 4 as trigger source.
– Connect a 2.5 V
pp
, 1 kHz square wave signal (switching between 0 V and 2.5 V and vice versa) to input CH 4.
– Press CH 3/4 pushbutton to call the “CH 3/4” menu.
– Press “Probe” function key and turn INTENS knob until “Probe *1” is displayed.
– Press “Threshold” function key to call the “CH 4 Threshold” submenu.
– Press “TTL” function key so that the CH 4 trigger threshold is 1.4 V.
– Set time base to 500 μs/div.
– Check that CH 4 displays several – stable triggered – high and low states.
– Continue with item 77.
75 CH 3, USER defi nable Trigger Threshold Check
76 CH 4, TTL Trigger Threshold Check
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