Tektronix 2246 User Manual

Ml
Measurement
Processes
and
Applications—2246
Operators
MAKING MEASUREMENTS
The TEKTRONIX 2246 Oscilloscope provides an accu-
rate and flexible measurement system. After becoming
familiar with the controls, indicators, menus, and capabili-
ties of the instrument, an operator can develop convenient
methods for making special measurements required by his
or her own applications. The measurements given in this
subsection are examples of typical applications that may
assist in developing efficient techniques for your specific
measurements. A brief description of how the graticule
markings are used in making measurements is given in
Section 4 of this manual.
CH1/CH2 VOLTMETER
MEASUREMENTS
The CH1/CH2 VOLTMETER measurements are con-
tinuous measurement of the DC, +PEAK, —PEAK, or
PK-PK values of an applied signal. The readout of the
measurement value is given in the crt readout. Measure-
ment tracking and/or ground tracking cursors may be
displayed to give the user instant feedback about where
on the applied signal the measurement is being made and
the location of ground level.
GATED modes of +PEAK, -—PEAK, and PK-PK
measurements may be used to define the area of the
measurement on the displayed waveform. The position
and width of the gated region is displayed as an intensified
zone on the A trace of the waveform display. Position of
the gated region on the waveform is controlled by the l- or
DELAY control and width of the gated region is controlled
by the -l or A control.
Some features of the CH1/CH2 VOLTMETER function
are:
a. Measures either CH 1 or CH 2 while viewing any
channel. (Select the measurement source channel using
the SET MEAS’MT CHANNEL menu.)
b. Measures signal levels (DC values and peaks) in
SGL SEQ (single-sequence) Trigger MODE continu-
ously. (Use CONFIGURE to get menus and readouts to
remain on between single sequence triggers.)
c. Finds peaks of signal applied, not only just the
displayed portions of the waveform.
d. Defines a portion of the waveform {GATED
measurements—especially useful for making measure-
ments on a multi-level signal) on which to make the
selected measurement. (Use page 2 of the CH1/CH2
VOLTMETER menu to select a GATED-measurement
mode.)
NOTE
Very narrow-gated measurements at 20 ns per div —
sweep speed are impractical due to imprecise
definition of the intensified zone at that sweep
speed.
+PEAK VOLTAGE MEASUREMENT
Setup for Front Panel Controis
The following procedure is a general front-panel setup
for making any type of CH1/CH2 VOLTMETER or CUR-
SORS measurement on an unknown signal. Use it as a
guideline to set up for your specific measurement applica-
tions, The control settings used in the procedure should
produce a triggered, viewabie display for most input signal
types. Certain signals such as video or aperiodic signals
(non-repeating) and signals containing many unrelated fre-
quency components may require more trigger signal condi-
tioning and/or holdoff to obtain the best display.
1. Apply the test signal to be measured to either the
CH 1 or the CH 2 input connector. If using coaxial cable to
make the signal connections, remember to correctly ter-
minate them at the input to the 2246. If using the supplied
10X probes, no further matching devices are needed. The
choice of using coaxial cables or a probe to connect the
input signal depends on the signal's source. Generally, for
an active circuit under test, probes are used; signals from
test generators usually are connected via terminated coax-
ial cables.
2. Set the front-panel controls as follows:
A INTEN and
READOUT For good viewing intensity.
SCALE ILLUM As needed.
VERTICAL MODE To display the test signal.
VERTICAL POSITION Center the display vertically.
6-9

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English