Tektronix 2247A

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Basic Applications
delayed traces matching the Intensified zones. A direct readout of the delay
difference between the two zones Is displayed In the top line of crt readout.
Use the following procedure steps as a guideline for making delta-time
delay-time measurements.
1. Apply the signals that measurements are to be made on to the vertical
Input connectors. Turn on the VERTICAL MODE channels needed to
display the signals.
NOTE
Probes are the most convenient for in-circuit testing, and
coaxial cables are the most convenient when using signal
generators as the source of the test signals. Use correct
terminations to match the output impedance of any signal
generator used. The CH 1 and CH 2 vertical channels pro-
vide the widest range of signal conditioning, and the CH 3
and CH 4 vertical channels are most useful for digital signal
levels.
2. Use a VOLTS/DIV setting that produces a usable vertical display ampli-
tude for viewing ease; use an A SEC/DIV setting that produces two to
five repetitions or cycles of the signal across the graticule area.
NOTE
When viewing multiple traces, it is best to limit the vertical
amplitude to about two divisions so that good trace sepa-
ration may be obtained in the display.
3. Switch the Horizontal MODE to ALT. Advance the SEC/DIV setting at
least one position to obtain a faster B SEC/DIV setting.
4. Set the B Trigger MODE to RUNS AFTER.
5. Press the TIME button, then select the + SEC >| menu choice. This
produces two Intensifled zones on the A Sweep trace and two alternate
B Delay Sweeps. Use the TRACE SEP and VERTICAL POSITION con-
trols to position the B Delay Sweeps vertically In the graticule area for
ease of viewing the separate traces.
2247A Operators 5-15