Ac Peak - To -Peak Voltage; Making Digital Storage; Using Cursors; Ground Referenced Dc - Tektronix 2221 Operator's Manual

1
Basic Applications -- 2221 Operators
MAKING DIGITAL STORAGE MEASUREMENTS
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The following procedures will enable the operator to perform some basic measurements and familiarize the operator with
digital storage measurement techniques.
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AC PEAK - TO - PEAK VOLTAGE
USING CURSORS
AV19.80V
H
+
ACTIVE CURSOR
NOTE
100
1
90
Either channel input connector may be used for the
signal input . Use the VERTICAL MODE switches to
select the appropriate channel for display.
V
1. Preset instrument controls and obtain a baseline
trace. 10
1
L
FIXED CURSOR
2. Set the STORE /NON -STORE switch to the STORE
position ( button in) .
2V
4998-14
3. Select a VOLTS /DIV switch setting that gives the
desired vertical deflection .
Figure 6-12. Ac peak - to -peak voltage, cursor method.
UU
4. Set the SEC/ DIV switch to display several cycles of
the waveform .
8. Read the peak - to -peak amplitude from the DELTA
VOLTS readout . If the VOLTS /DIV Variable control is out
of the calibrated detent , the DELTA VOLTS readout
switches to RATIO .
5. Two cursors are displayed on the waveform to be
measured .
The boxed cursor is the active ( selected)
cursor.
GROUND REFERENCED DC VOLTAGE
6. Use the CURSORS control to move the active cur
sor to either peak of the waveform .
NOTE
Either channel input connector may be used for the
signal input. Use the VERTICAL MODE switches to
select the appropriate channel for display. 7. Push the SELECT C1 /C2 button to select the other
cursor , and use the CURSORS control to move the cursor
to the opposite peak of the waveform (see Figure 6-12) .
U U
1. Preset instrument controis and obtain a baseline
trace.
NOTE
2. Determine the polarity of the voltage to be mea
sured as follows :
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After the waveform is acquired , the SAVE Storage
mode may be selected.
This mode holds the
waveform frozen and reduces the amount of cursor
jitter seen in the display. The SAVE display may be
expanded horizontally and vertically for a more
detailed examination of the waveform ( see SAVE
Mode Display )
a . Set the AC -GND -DC switch to GND and verti
cally position the baseline trace to the center
horizontal graticule line.
6-14
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