Tektronix T921 User Manual

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MEN
VERTICAL
DEFLECTION
1907-27
Fig . 2-12 . Peak-to-peak voltage measurement
.
Instantaneous Amplitude Measurement
The following procedure expains how to measure the
amplitude of any point on a waveform with respect to
ground .
1 . Set the AC-GND-DC switch to DC .
2 . Apply the signal to be measured to one of the
vertical input connectors . Set the Vertical Mode switch to
select the channel used .
3 . Obtain a stable display, centered vertically .
4 . Set the AC-GND-DC switch to GND . Adjust
the
trace to some reference
line
(see
Fig . 2-13) .
5 . Set the AC-GND-DC switch to DC . If the waveform
appears above the reference line, the voltage is positive .
If
the waveform appears below the reference
line, the
voltage
is
negative
.
6 . Measure the vertical difference (in divisions)
between the reference line and the desiredpoint on
the
waveformand multiply by the
VOLTS/DIV switch setting .
Example :
The vertical difference is 5 divisions (see
Fig . 2-13) . The
VOLTS/DIV switch is
set to 10 mV . The waveform appears
above the reference line .
Operating Instructions-T921/T922/T922R
Substituting the given values :
Instantaneous
__

5

x

10 mV/
-

50 mV
Voltage
divisions divisions
Instantaneous
=
+50 mV
Voltage
ON
MOM ME
I IN!
Nil ME ENO 0
M_ -1
VERTICAL
DIFFERENCE
90
REFERENCE
LINE
1907-28
Fig . 2-13 .
Instantaneous voltage measurement .
Dual Trace Phase Difference
Measurement
Phasecomparison
between two signals of the same
frequency
can be accomplished using the dual-trace
feature .
This method of phase difference measurement
canbe used up to the frequency limit of
the vertical
system . It is also more accurate and easier to use
than the
X-Y method . Tomake the comparison, use
the following
procedure :
1 . Set
the AC-GND-DC switches to AC .
2 . Set the Vertical
Mode switch to DUAL TRACE .
Position both
traces to the graticule horizontal centerline .
3 . Connect the reference signal to
the CH 1 input
connector and the comparison
signal to the CH 2 input
connector . Use coaxial
cablesor probes which have equal
time delay to
connect the signals to the input connectors .
4 . Setthe CH 1 and CH 2 VOLTS/DIV switches
and the
CH 1 and CH 2 VAR controls to that the
displays are equal
and about five divisions in amplitude
.
5 . Set the
SEC/DIV switch to a sweep rate which
displays about one cycle of the reference waveform
.
2- 1 5

Tektronix T921 Specifications

General

Brand	Tektronix
Model	T921
Category	Test Equipment
Language	English