Tektronix, Inc. P6240, User Manual

Page: 47 / 321

Example 3: Taking Measurements Automatically
TLS 216 User Manual
1–27
Any time the general purpose knob is set to adjust a numeric parameter, you can
enter the value as a number using the keypad instead of using the knob. Always
end the entry of a number by pressing the ENTER (
) key.
The numeric keypad also provides multipliers for engineering exponents, such as
m for milli, M for mega, and
m
for micro. To enter these multiplier values, press
the SHIFT button, then press the multiplier.
1. Press Low Ref (side).
2. On the numeric keypad, press the 2, the 0, and the ENTER ( ) buttons,
which sets the low measurement reference to 20%. Observe that the rise-time
value has changed.
3. Press Remove Measrmnt (main)
➞
All Measurements (side). The display
will return to its original state.
Take a Snapshot of Measurements
You have seen how the logic scope can display up to four individual automated
measurements on screen. You can also pop up a display of almost all the
automated measurements available in the Select Measrmnts side menus. This
snapshot of measurements is taken on the currently selected waveform in the
currently selected group. (Use the group front-panel buttons to select the group;
use the Group Menu to select the channel in the selected group.)
As when displaying individual measurements, you must have a stable display of
your signal, and the signal must have all the segments necessary for the
measurement you want.
1. Press Snapshot (main) to pop up a snapshot of all available single waveform
measurements. (See Figure 1-20).
The snapshot display includes the notation Ch 2, meaning that the logic
scope took the measurements listed on the Channel 2 waveform. To take a
snapshot of a waveform in another channel, first select the group that
includes the channel and then select the channel.
The snapshot measurements do not continuously update. Snapshot executes a
one-time capture of all measurements and does not update those measure-
ments unless you execute another snapshot.
The Numeric Keypad