Tektronix 47E5A

32
POSITION TO
CENTERLINE
VERTICAL
DEFLECTION
~c...,lI-+-t------t--r--t--#-t----I-~ ~ ___ i
MEASURE AMPLITUDE
FROM ATO B
(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 a valley. This will subtract the trace thickness from
the
measurement .
Multiply the vertical deflection just measured by the
VOL TS/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 VOL TS/DIV
switch setting of .5.
Using the
formula :
Volts
Peak-to-peak
vertical
deflection
(divisions)
Substituting the given values:
X VOL TS/DIV
setting
Volts Peak-to-Peak = 4.6 X 0.5 V = 2.3 volts.
INSTANTANEOUS VOLTAGE
MEASUREMENTS-DC
Obtain a Normal Display . Make sure the VAR
VOL TS/DIV control is in the calibrated detent.
475A/DM44 Operators
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