Tektronix 2246 Operator's Manual page 41

Section 6—2246 Operators
MEASUREMENT PROCESSES AND
APPLICATIONS
This section is divided into three subsections: MENU SYSTEM OPERATION, MAKING MEASUREMENTS, and OTHER
OPERATING FEATURES. The first subsection details the ways in which the measurement menus operate. The second
subsection provides some general applications for using the measurement menus to make measurements on signal
waveforms. The third subsection discusses use of other oscilloscope features that may aid the user in general measure-
MENU SYSTEM OPERATION
The menu system is used to activate the measurement
features of the 2246 and modify the ways in which those
features operate. The control menus comprise the
measurement menu call-up buttons (SET MEAS'MT
CHANNEL, LAST MEAS'MT, CHI/CH2 VOLTMETER,
CURSORS, and ATIME), the menu-itern selection buttons
beside the crt, the crt menu display, and the CLEAR
Pressing one of the measurement menu call-up buttons
causes a list of menu items to be displayed on the right-
hand side of the crt beside a group of six menu selecticn
buttons. Pressing the menu button next to a menu item on
the display selects that function (Le., to another menu
page, a measurement selection, a measurement source
channel, or menu off), When an measurement mode or
measurement source channel in the menu list is selected,
that tabel is underlined.
Normally, the menu display turns off after a measure-
ment function is selected (if not configured to remain on),
and the name and value of a selected measurement func-
tion appears in the top line of the crt readout. However,
when it Is possible to make more that one selection from
the menu list (or if the menu is configured to remain on),
the menu will remain displayed for making further choices
until either MENU OFF is selected or the CLEAR DISPLAY
CLEAR DISPLAY—Turns off a displayed menu, turns
off a measurement function (and CH1/CH2 TRACK
MEASMT cursors), and turns off the TRACK TRIG LVL
and TRACK rh cursors in three levels depending on
what is on that can be turned off. lf a menu is on, the
first press clears it from the display; measurement func-
tions are turned off with the second press (or the first
press if no menu is displayed); and finally the TRACK
TRIG LVL and TRACK rh cursors are canceled with a
third press (or the first press if no menu is displayed
and no measurement functions are active).
SET MEASUREMENT CHANNEL
The menu called up by pressing SET MEAS'MT CHAN-
NEL depends on the measurement type, either CH1/CH2
VOLTMETER or ATIME (see Tabie 6-1). An error message
of "NO MEAS CHANNEL NEEDED" is displayed for two
seconds if attempting to select a measurement channel
when a CURSORS time-measurement mode is active.
Pressing a menu button next to a channel number
selects that choice as the source channel for the measure-
ment. For CH1/CH2 VOLTMETER measurements, the
selected source channel need not be displayed and is not
automatically turned on when selected. It is possible there-
fore to view a CH 1 display and have the CH 2 voltage
measurement value displayed by the readout (and vice
When setting the measurement channel for the
le VOLTS =I or rh VOLTS >| SmartCursors® or when set-
6-1