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.
