5-3
IM 701510-01E
Setting the V
ertical and Horizontal
Axes
5
Offset voltage and displayed value (measured value)
The offset function eliminates unnecessary DC voltage from an input signal voltage. If the
offset voltage is set to a positive value, the input signal is displayed with the offset voltage
subtracted from it, as shown below. The offset voltage is also subtracted from the measured
voltages obtained during automated measurements.
Decreases by "a" V.
offset : aV
Points to note when setting the offset voltage
• Once the offset voltage has been set, it will not change unless initialization is performed.
For instance, if the input coupling is set to “AC” after the offset voltage has been set, the
offset voltage will remain unchanged even if the input coupling is later switched to “DC”.
• When the probe attenuation is changed, the offset voltage also changes accordingly.
• The offset voltage remains unchanged irrespective of the vertical sensitivity. However, if
the offset voltage exceeds the allowable setting range, it will be set to the maximum or
minimum vertical sensitivity value.
• When the offset voltage is set, it will also be subtracted from the acquired waveform data
in acquisition memory. Thus, care must be taken when saving acquisition data.
CAUTION
When using AC coupling with a 10 M
Ω
, 10:1 probe, keep in mind that the
voltage at the input connector will not be attenuated to 1/10 at the probe tip
for input signal components below 1 Hz. Be careful not to let the input voltage
at the probe tip exceed 250 V (DC+ACpeak) or 177 Vrms for signal
components below 1 Hz.
5.2 Setting the Input Coupling
