Remember that the DC reference line presented when the
INPUT COUPLING switch is set to GND is an elevated voltage, not
ground, and is present on both probe ground clips and the
COMMON input jack. To determine the actual instantaneous
voltage with respect to earth ground, add the reference voltage to
the result of the Instantaneous Voltage Formula.
Time-Duration Measurements
Time between two or more events can be measured directly on
the graticule as follows:
NOTE
See the topic entitled HORIZONTAL SWEEP RATE
concerning non-linearity of first and last divisions of
display.
a. Using the graticule, measure the horizontal distance between
the two events.
b. Multiply the distance measured by the SEC/DIV control
setting to obtain the time interval. The HORIZ MAG must be
in the CAL position.
29
212 Operators Handbook
