Tektronix 2212 User Manual page 67

Non-Storage Examples
Step 2. Toggle the Trigger SOURCE switch to CH1.
Step 3. Set both AC-GND-DC switches to the same position, de-
pending on the type of input coupling desired (AC or DC).
Step 4. Connect a known reference signal to the CH1 OR X input
connector and the unknown signal to the CH2 OR Y
input connector.
Step 5. Toggle the Vertical MODE switch to ALT or CHOP,
depending on the frequency of the input signals. The
reference signal should precede the comparison signal in
time.
NOTE
If the two signals are of opposite polarity, you can set the
CH2 INVert switch to invert the CH 2 display and make the
phase measurement. Remember to add 180 degrees to the
phase difference to get the total phase shift between the two
signals.
Step 6. Adjust both VOLTS/DIV switches and both V ARiable
VOL TS/DIV controls so that the displays have the same
amplitude.
Step 7. Adjust the Trigger LEVEL control for a stable display.
Step 8. Set the SEC/DIV and V ARiable SEC/DIV controls for one
period of the reference waveform to be exactly five divi-
sions. Position the waveform to the zero-crossing point.
Step 9. With the SEC/DIV UNCALibrated, toggle the
~
Vl/
~
V2/
~T/1/~T switch to 1/~T. "PHASE" appears in the upper
left corner of the crt screen.
Step 10. Set the cursors for one period of exactly five divisions
(Phase 360 degrees) on the reference waveform. Readjust
or position the reference waveform as necessary.
Step 11. Position the cursors to the zero-crossing points on the two
waveforms (see Figure 3-9).
Step 12. Now , you can read the PHASE difference in degrees from
the crt readout.
2212 User Manual
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