4 Triggering
92 InfiniiVision Oscilloscopes User’s Guide
External Trigger Input
The External Trigger input can be used as a source in several of the trigger types.
On 2-channel oscilloscopes, the external trigger BNC input is on the front panel and is
labeled Ext Trigger.
On 4-channel oscilloscopes, the external trigger BNC input is on the rear panel and is
labeled Ext Trig.
2-Channel Oscilloscope External Trigger Input
External Trigger Probe Settings
You can set external trigger probe parameters as described below.
1 Press the [Mode/Coupling] key in the Trigger section of the front panel.
2 Press the External softkey to display the External Trigger Menu.
Probe Attenuation Turn the Entry knob to set the attenuation factor displayed in the
Probe softkey for the connected probe. The attenuation factor can be set from 0.1:1 to
1000:1 in a 1-2-5 sequence.
When you connect an AutoProbe self-sensing probe, the oscilloscope will automatically
configure your probe to the correct attenuation factor.
The probe correction factor must be set properly for measurements to be made correctly.
Range The input voltage range can be set to 1.0 Volts or 8.0 Volts. When in current
mode, the range is fixed at 1.0 Amps. Range is automatically scaled according to the
probe’s attenuation factor.
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