214 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
12 Trigger Mode/Coupling
 
Measurement results, channel sensitivity, and the trigger level will reflect the 
measurement units you have selected.
4 Press the Probe softkey; then, turn the Entry knob to specify the probe 
attenuation.
The attenuation factor can be set from 0.001:1 to 10000:1 in a 1-2-5 sequence.
The probe attenuation factor must be set properly for measurements to be 
made correctly.