Instantaneous Voltage Measurements-Dc; Instantaneous Voltage Measurements - Tektronix 475A Instruction Manual

POSITION TO
CENTERLINE
VERTICAL
DEFLECTION
MEASURE AMPLITUDE
FROM A FOB
(1738-16)2039-15
Fig. 14. Peak-to-peak voltage of a waveform.
NOTE
if the amplitude measurement is critical or if the
trace is thick as a result of hum and/or noise on the
signal, a more accurate measurement can be ob-
tained by measuring from the top of a peak to the top
of avalley, This wili subtract the trace thickness from
the measurement.
Multiply the vertical deflection just measured by the
VOLTS/DIV switch setting. Also include the attenuation
factor of the probe if the probe does not have a scale-
factor switching connector.
Example: The peak-to-peak vertical deflection
measured is 4.6 divisions (see Fig. 14) with a VOLTS/DIV
switch setting of .5.
Using the formula:
Volts vertical
Sadko Hask = deflection X
p (divisions)
Substituting the given values:
Volts Peak-to-Peak = 4.6 X 0.5 V = 2.3 volts. 1
INSTANTANEOUS VOLTAGE
MEASUREMENTS—DC
Obtain a Normal Display. Make sure the VAR
VOLTS/DIV control is in the calibrated detent.
32 475A/DM44 Operators @