Triggering the Oscilloscope

External Trigger Input

External Trigger Input

C A U T I O N

C A U T I O N

External Trigger can be used as a source in several of the trigger types. On

4-channel and mixed-signal oscilloscopes, the external trigger BNC input is on the rear panel and is labeled Ext Trig. On 2-channel oscilloscopes, the external trigger BNC input is on the front panel and is labeled Ext Trigger.

Maximum input voltage for the external trigger input:

CAT I 300 Vrms, 400 Vpk

CAT II 100 Vrms, 400 Vpk

with 10073C or 10074C 10:1 probe: CAT I 500 Vpk, CAT II 400 Vpk

Do not exceed 5 Vrms in 50mode on the 54640-series models. Input protection is enabled in 50mode and the 50load will disconnect if greater than 5 Vrms is detected. However the input could still be damaged, depending on the time constant of the signal.

The 50input protection mode on the 54640-series models only functions when the oscilloscope is powered on.

External Trigger Probe Settings

You can set probe attenuation, units, and input impedance for the external trigger input.

1 Press the Mode/Coupling key in the Trigger section of the front panel.

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Agilent Technologies 41A, 54621D, 24A, 42A, 54621A, 22A manual External Trigger Input, External Trigger Probe Settings