Keysight InfiniiVision HD3 Series - Maximum Voltage at Oscilloscope External Trigger Input

160 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
11 Trigger Mode and Conditioning
The external trigger input impedance is 1M Ohm. This lets you use passive probes
for general-purpose measurements. The higher impedance minimizes the loading
effect of the oscilloscope on the device under test.
To set the AUX TRIG IN units and probe attenuation:
1 Open the Conditioning dialog box by selecting Conditioning... in the Trigger
dialog box or by choosing choose Trigger > Conditioning... from the main menu.
2 In the Conditioning dialog box, select the External tab.
3 From the Units drop-down list, select between:
• Volts — For a voltage probe.
• Amps — For a current probe.
Measurement results, channel sensitivity, and the trigger level will reflect the
measurement units you have selected.
4 Select how you want to specify the Attenuation factor, choosing either Ratio or
Decibels.
5 Select the Probe attenuation factor field; then, turn the Entry knob to set
the attenuation factor for the connected probe.
The attenuation factor can be set from 0.001:1 to 10000:1 in a 1-2-5 sequence.
When specifying the attenuation factor in decibels, you can select values from
-20 dB to 80 dB.
The probe attenuation factor must be set properly for measurements to be
made correctly.
As you adjust the Probe attenuation factor, the Range field shows you the range
of values that can appear on the external trigger input.
CAUTION
Maximum voltage at oscilloscope external trigger input
±5 V