Tektronix 2213 Operator's Instruction Manual

2213 Operators
Time Comparison
In a similar manner to “Amplitude Comparison,”
repeated time comparisons between unknown signals and
a reference signal (e.g., on assembly line test) may be easily
and accurately measured with the 2213. To accomplish
this, a reference signal of known time duration is first set
to an exact number of horizontal divisions by adjusting
the
SEC/DIV switch and the SEC/DIV Variable control.
Unknown signals can then be compared with the reference
signal without disturbing the setting of the
SEC/DlV
Variable control. The procedure is as follows:
1. Set the time duration of the reference signal to an
exact number of horizontal divisions by adjusting the
SEC/DIV switch and the SEC/DlV Variable control.
2. Establish a horizontal conversion factor, using the
following formula (reference signal time duration must be
known):
Horizontal
reference signal time
Conversion =
duration (seconds)
Factor
horizontal
SEC/DIV
distance x
switch
(divisions)
setting
3. For the unknown signal, adjust the
SEC/DlV switch
to a setting that provides sufficient horizontal deflection
to make an accurate measurement. Do not readjust the
SEC/D IV Variable control.
4. Establish an arbitrary deflection
following formula:
factor, using the
Arbitrary horizontal
SEC/DIV
Deflection = conversion x
switch
Factor factor setting
5. Measure the horizontal distance of the unknown
signal in divisions and calculate its time duration using the
following formula:
Time
arbitrary
horizontal
Duration
= deflection x
distance
factor
(divisions)
6. Frequency of the unknown
signal C
an then
be de
mined by
calculating the reciprocaaI of its
t ime dur
ation.
ter-
EXAMPLE: The reference signal time duration is
2.19 ms, the
SEC/DIV switch setting is 0.2 ms, and the
SEC/DIV Variable control is adjusted to provide a
horizontal distance of exactly 8 divisions.
Su bstitu
ting the
on factor
formula:
given values in the horizontal conver-
Horizontal
Conversion =
2.19 ms
8 div x 0.2 ms/div
= 1.37
Factor
Continuing, for the unknown signal the
SEC/DIV
switch setting is 50 JJS, and one complete cycle spans 7
horizontal divisions. The arbitrary deflection factor is then
determined by substituting values in the formula:
Arbitrary
Deflection
= 1.37 x 50 psldiv = 68.5 &div
Factor
The time duration of the unknown signal can then be
computed by substituting values in the formula:
Time
=
Duration
68.5
psldiv x 7 div = 480~s
The frequency of the unknown signal is then calculated:
1
Frequency = -
480 pus
= 2.083 kHz
DELAYED-SWEEP MAGNIFICATION
The delayed-sweep feature of the 2213 can be used to
provide higher apparent magnification than is provided by
the X10 Magnifier switch. Apparent magnification occurs
as a result of displaying a selected portion of the trace
(INTENS HORIZONTAL MODE) at a faster sweep speed
(DLY’D HORIZONTAL MODE).
When
INTENS HORIZONTAL MODE is selected, the
intensified zone indicates both the location and the start
of the sweep that will be displayed in DLY’D HORI-
ZONTAL MODE. Positioning of the intensified zone
(i.e.,setting the amount of time between start of the
sweep and start of the intensified zone) is accomplished
with the MULTIPLIER control and the DELAY TIME
Range Selector switch. At higher sweep speeds the delay
time can be adjusted to allow the starting point of the
intensified zone to occur past the end of the display.
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Tektronix 2213 Specifications

General

Brand	Tektronix
Model	2213
Category	Test Equipment
Language	English