EXAMPLE: The time duration of the signal in Fig. 13 was
8 ms. Its frequency is:
Frequency
time duration
Substituting:
8 ms
125 Hz
Amplitude Comparison
ARBITRARY VERTICAL DEFLECTION FACTOR.
The
desired signal amplitude to be measured may not be an
exact number of divisions of deflection. If the measure
ment is repetitious (e. g., on an assembly-line test). it is
possible to obtain more accurate, easily read measurements
if the VOLTS-mA/DIV control and the VOL TS-mA/DIV
VAR control are adjusted to set the desired signal ampl i
tude to an exact number of divisions.
To establish an arbitrary vertical conversion factor, connect
a known amplitude reference signal and adjust the VOL TS
mA/DIV and VOL TS-mA/DIV VAR controls for the desir
ed vertical deflection. Be careful not to move the VOL TS
mA/DIV VAR control after this setting.
Determine the vertical conversion factor using this formula:
Vertical
Conversion
Factor
reference signal amplitude (volts)
vertical
deflection
(divisions)
x VOL TS-mA/DIV
setting
EXAMPLE: The reference signal amplitude measured is 30
volts with the VOL TS-mA/DIV control set to 5 and the
VOL TS-mA/DIV VAR control adjusted to provide a verti
cal deflection of 4 divisions.
Substituting:
30 V
4x5
1.5
To measure the unknown signal, set the VOL TS-mA/DIV
control to provide sufficient vertical deflection to make an
accurate measurement. Do not readjust the VOL TS-mA/
DIV VAR control. Measure the vertical deflection in divi
sions and calculate the amplitude of the unknown signal
using the following formula:
Signal
Amplitude
VOLTS-mA/DIV
setting
vertical
x conversion
factor
vertical
x deflection
(divisions)
24
213 Operators
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Summary of Contents for 200 Series
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