Measurement System
TDS 620A, 640A, & 644A User Manual
2. Press High Ref, Mid Ref, Low Ref, or Mid2 Ref (side).
High Ref — Sets the high reference level. The default is 90%.
Mid Ref — Sets the middle reference level. The default is 50%.
Low Ref — Sets the low reference level. The default is 10%.
Mid2 Ref — Sets the middle reference level used on the second
waveform specified in the Delay or Phase Measurements. The default
is 50%.
Figure 3-48: Measure Menu — Reference Levels
Delay Measurement
The delay measurement lets you measure from an edge on the selected
waveform to an edge on another waveform. You access the Delay Measure-
ment menu through the Measure main menu:
Press MEASURE Select Measrmnt (main) Delay (side). This brings up
the Measure Delay main menu (see Figure 3-49).
Delay to — To select the waveform you want to measure
to
, use the main
menu item Delay to. The waveform you are measuring
from
is the selected
waveform.
1. Press MEASURE Select Measrmnt (main) Delay (side) Delay
To (main) Measure Delay to.