Tektronix 475A - Time Difference between Two Pulses from Different Sources

TIME-DIFFERENCE BETWEEN
TWO PULSES FROM
DIFFERENT SOURCES
Obtain a Normal Sweep Display. Make sure the VAR
TIME/DIV control is in the calibrated detent. Set the A
Trigger SOURCE switch to CH 1. Connect the reference
signal to CH 1 and the comparison signal to CH 2. Connect
the signals to the input connectors using probes or cables
with equal time delay. |
Set the VERT MODE switch to either CHOP or ALT. In
general, CHOP is more suitable for low-frequency signals
and the ALT position is more suitable for high-frequency
signals. Center each of the displays vertically (see Fig. 20).
Measure the horizontal difference between the two
signals. Multiply the measured difference by thesetting of
the TIME/DIV switch; if sweep magnification is used,
divide this answer by 10.
EXAMPLE: The TIME/DIV switch is set to 50 us, the
MAG switch to X10 and the horizontal difference between
waveforms is 4.5 divisions (see Fig. 20).
40 475A/DM44 Operators e
CHANNEL 1 (REFERENCE) CHANNEL 2
I
gne! HORIZONTAL
DIFFERENCE
Fig. 20. Time difference between two pulses from different
sources.
Using the formula:
: horizontal
pa = X difference
Time = ES (divisions)
Difference magnification
Substituting the given values:
Time
=
6005
X45
_
po
5
microseconds
Difference
10