Operating Instructions—Type 422 AC-DC
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2. Set the VOLTS/DIV switch and the VARIABLE
VOLTS/DIV control to produce a display an exact number
of graticule divisions in amplitude. Do not change the
VARIABLE VOLTS/DIV control after obtaining the
desired deflection. This display can be used as a reference
for amplitude comparison measurements.
3. To establish an arbitrary vertical defelction factor so
the amplitude of an unknown signal can be measured
accurately at any setting of the VOLTS/DIV switch, the
amplitude of the reference signal must be known. If it is
not known, it can be measured before the VARIABLE
VOLTS/DIV control is set in step 2.
4. Divide the amplitude of the reference signal (volts) by
the product of the vertical deflection established in step 2
(divisions) and the setting of the VOLTS/DIV switch. This
is the vertical conversion factor.
Vertical reference signal amplitude (volts)
Conversion =
---------------------------------------------------------
Factor vertical deflection (divisions) X VOLTS/
DIV switch setting
5. To measure the amplitude of an unknown signal,
disconnect the reference signal and connect the unknown
signal to the INPUT connector. Set the VOLTS/DIV switch
to a setting that provides sufficient vertical deflection to
make an accurate measurement. Do not readjust the
VARIABLE VOLTS/DIV control.
1. Connect the reference signal to the INPUT connec
tor. Set the VOLTS/DIV switch for four or five divisions of
vertical deflection.
2. Set the TIME/DIV switch and the VARIABLE
TIME/DIV control so one cycle of the signal covers an
exact number of horizontal divisions. Do not change the
VARIABLE TIME/DIV control after obtaining the desired
deflection. This display can be used as a reference for fre
quency comparison measurements.
3. To establish an arbitrary sweep rate so the repetition
rate of an unknown signal can be measured accurately at
any setting of the TIME/DIV switch, the repetition rate of
the reference signal must be known. If it is not known, it
can be measured before the VARIABLE TIME/DIV switch
is set in step 2.
4. Divide the repetition rate of the reference signal
(seconds) by the product of the horizontal deflection estab
lished in step 2 (divisions) and the setting of the TIME/DIV
switch. This is the horizontal conversion factor
Horizontal
Conversion =
Factor
reference signal repetition rate (seconds)
_____________
horizontal deflection (divisions) X TIME/DIV switch setting
6. Measure the vertical deflection in divisions and
calculate the amplitude of the unknown signal using the
following formula.
g. . VOLTS/DIV vertical vertical
_ , = switch x conversion X deflection
Amplitude settjng factor (divisions)
EXAMPLE. Assume a reference signal amplitude of 30
volts, a VOLTS/DIV switch setting of 5 and the VAR IA
BLE VOLTS/DIV control is adjusted to provide a vertical
deflection of four divisions.
Substituting these values in the vertical conversion factor
formula (step 4):
Vertical v
Conversion = 7\~x §
.
V~ = ^
Factor
Then with a VOLTS/DIV switch setting of 10, the peak-to-
peak amplitude of an unknown signal which produces a
vertical deflection of five divisions can be determined by
using the signal amplitude formula (step 6):
Signal = io v X 1.5 X 5 = 75 volts
Amplitude
5. To measure the repetition rate of an unknown signal,
disconnect the reference signal and connect the unknown
signal to the INPUT connector. Set the TIME/DIV switch
to a setting that provides sufficient horizontal deflection to
make an accurate measurement. Do not readjust the VAR
IABLE TIME/DIV control.
6. Measure the horizontal deflection in divisions and cal
culate the repetition rate of the unknown signal using the
following formula:
Repetition
Rate
TIME/DIV horizontal horizontal
switch X conversion X deflection
setting factor (divisions)
NOTE
If the horizontal magnifier is used be sure to use the
magnified sweep rate in place of the TIME/DIV
switch setting.
EXAMPLE. Assume a reference signal frequency of 455
hertz (repetition rate 2.19 milliseconds), and a TIME/DIV
switch setting of .2 ms, with the VARIABLE TIM E/DIV
control adjusted to provide a horizontal deflection of eight
divisions. Substituting these values in the horizontal conver
sion factor formula (step 4):
Sweep Rates. To establish an arbitary horizontal sweep
rate based upon a specific reference frequency, proceed as
follows:
Horizontal
Conversion
Factor
2.19 milliseconds
---------------------------
= 1.37
.2X8
2-23
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