HP 53131A, Operating Manual

Page: 89 / 196

Chapter 2 Operating Your Universal Counter
Using the MEASURE Menu Keys
Operating Guide 2-13
2
To Measure Time Interval
Press Time & Period key until TI 1 TO 2 is displayed.
TI 1 TO 2 is momentarily displayed, the Time, Ch1, and Ch2
annunciators light, and the Counter is ready to measure the length of time
between a start event on CHANNEL 1 and a stop event on CHANNEL 2.
The Counter is automatically set to measure from separate signal
sources. (The start and stop events may be derived from separate
signal sources, or they may be from a single source. Refer to the
section in this chapter titled “Using CHANNEL 1 and CHANNEL 2
Input Conditioning Keys” for specifics in performing Time
Interval measurements on a single source—COMMON 1: ON).
Independent slope, trigger level, and sensitivity controls for the start and
stop events allow variable triggering on either positive- or negative-going
slopes.
The trigger levels are set to the 50% points of each signal. However,
you may disable auto triggering, and change the trigger levels and slopes.
To Measure Period
Press Time & Period key until Period 1 is displayed.
Period 1 is momentarily displayed, the Period and Ch1 annunciators
light, and the Counter is ready to measure the period of a signal applied to
CHANNEL 1.
To Measure Rise/Fall Times
Press Time & Period key until RISETIME 1 or FALLTIME 1 , depending
on which measurement you want to make, is displayed.
RISETIME 1 or FALLTIME 1 is momentarily displayed, and the Rise or
Fall, Time, and Ch1 annunciators light. The risetime and falltime modes
of operation automatically configure the Counter to perform risetime or
falltime measurements through CHANNEL 1 input. The triggering is
automatically set to AUTO TRIG: ON. In the risetime and falltime modes,
AUTO TRIG automatically locates the 10% and 90% points of the input
signal, and sets the trigger levels accordingly. You may override these
automatic selections if you want.