Tektronix 475A - Basic 475 A Delayed or Mixed Sweep Time Measurements; Time Difference between Repetitive Pulses (Basic 475 A)

BASIC 475A DELAYED OR MIXED SWEEP TIME MEASUREMENTS
The delayed sweep modes can be used to make more accurate time measurements.
TIME DIFFERENCE BETWEEN
REPETETIVE PULSES (BASIC 475A)
Obtain a Delayed Sweep Display. For the most accurate
measurement, set the B TIME/DIV switch to the fastest
sweep speed that gives usable (visable) intensified zones,
With the HORIZ DISPLAY switch set to A INTEN, use
the DELAY TIME POSITION dia! to move the intensified
zone to the first pulse (see Fig. 25A).
Set the HORIZ DISPLAY switch to B DLY’D. Adjust the
DELAY TIME POSITION dial to move the pulse (or rising
portion) to some vertical reference line (see Fig. 258).
Note the setting of the DELAY TIME POSITION dial. Turn
the DELAY TIME POSITION dial clockwise to move the
second puise to the same vertical reference line (if several
pulses are displayed, return to A INTEN to locate the
correct pulse). Do not change the settings of the horizon-
tal POSITION and FINE controis. Note the setting of the
DELAY TIME POSITION dial.
Determine the time difference using the following
formula:
second first delay time
dial = dial x A TIME/DIV
setting setting setting
EXAMPLE: Assume the first dial setting is 1.31 and the
second dial setting is 8.81 with the A TIME/DIV switch set
to 0.2 us (see Fig. 25).
Using the formula:
Time Difference =
delay time
A TIME/DIV
en Ea x (
setting)
setting setting
48 475A/DM44 Operators ©