3 Connecting to the Device Under Test
80 InfiniiVision Oscilloscopes User’s Guide
Manually Setting the Probe Attenuation Factor
The probe attenuation factor must be set properly for accurate measurement results.
If you connect a probe that is not automatically identified by the oscilloscope, you can
manually set the attenuation factor as follows:
1 Press the channel key.
2 Press the Probe softkey until you have selected how you want to specify the
attenuation factor, choosing either Ratio or Decibels.
3 Turn the Entry knob to set the attenuation factor for the connected probe.
When measuring voltage values, the attenuation factor can be set from 0.1:1 to 1000:1 in
a 1-2-5 sequence.
When measuring current values with a current probe, the attenuation factor can be set
from 10 V/A to 0.001 V/A.
When specifying the attenuation factor in decibels, you can select values from -20 dB to
60 dB.
If Amps is chosen as the units and a manual attenuation factor is chosen, then the units
as well as the attenuation factor are displayed above the Probe softkey.
Digital Probes
Please see “To connect the digital probes to the device under test” on page 372 for
information about digital probing.
Units and Attenuation Factor
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