EXAMPLE: The vertical distance measured in 5 divisions
(see Fig. 11), the waveform is above the reference I ine, and
the VOL TS-mA/DIV control is set to .5.
Using the formula:
Instantaneous
Voltage
NEGATIVE
VERTICAL
DEFLECTION
{
/
vertical
distance x
(divisions)
polarity x
VOL TS-mA/DIV
setting
�
NEGATIVE REFERENCE LINE
©
r--.....
,/
/
I/
POSITIVE
VERTICAL
DEFLECTION
'-H++-
1-11,
'-
�
POSITIVE REFERENCE LINE
1480-5
Fig. 11. De voltage with respect to a reference line.
Substituting:
5 x +1 x .5 = +2.5 V
If a negative voltage is to be measured, position the trace to
the top graticule Ii ne and measure between A and C (see
Fig. 11 ).
The ground reference line can be checked at any time by set
ting the INPUT COUPLING switch to the GND position.
To measure a voltage level with respect to another voltage
level, connect the common lead to the reference voltage and
make an instantaneous voltage measurement. See Elevated
Reference Voltage procedure.
Composite Voltage
In practice, most voltages measured are composites of ac and
de, and may be either sinusoidal or non-sinusoidal. It is these
voltages for which this instrument is best suited.
The waveform shown in Fig. 12 has its ac zero reference at
a de level and could be representative of a de power supply
output with an ac ripple. It can be measured by combin
ing instantaneous de, peak-to-peak ac, and rms measurement
procedures.
@
213 Operators
21
Summary of Contents for 200 Series
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