2-11
IM DL850E-01EN
Offset (Offset)
By adding an offset, you can move the waveform to a vertical position that is easier to see. For example, when
measuring a signal with a fixed voltage component, you can use the offset to cancel out the fixed voltage and
measure the signal changes at a higher voltage sensitivity.
You can set the offset for each channel.
The offset is useful when you are measuring voltage or using the frequency module to measure frequency or
some other value.
Vertical
position
mark
Ground
level
mark
Voltage sensitivity: 1.000 V/div
1.000 V/div
0.500 V/div
Vertical position: 0.00 div
1.00 div
1.00 div
Offset voltage:
0.000 V
–2.000 V
–2.000 V
Selectable Range of the Offset
When measuring voltage: ±5 div
For the frequency module, the range varies depending on what is being measured.
• When measuring frequency: ±(Value/div) × 1000 or 200 kHz
• When measuring revolutions in rpm: ±(Value/div) × 1000 or 50 krpm
• When measuring revolutions in rps: ±(Value/div) × 1000 or 1000 rps
• When measuring periods: ±(Value/div) × 1000 or 50 s
• When measuring duty ratios: ±(Value/div) × 1000 or 100%
• When measuring pulse widths: ±(Value/div) × 1000 or 50 s
• When measuring pulse integration: ±(Value/div) × 1000 or 1.0000E+22
• When measuring velocity: ±(Value/div) × 1000 or 1.0000E+22
Notes about Setting the Offset
• When you are measuring voltage, changes to the offset are applied when acquisition is stopped. When you
are measuring the frequency or some other value using the frequency module, changes to the offset are not
applied when acquisition is stopped. The changed offset will be applied to the next measurement.
• When you are measuring voltage, if you change the probe attenuation, the offset voltage is determined using
the new attenuation ratio.
• When you are measuring voltage, the offset will not change even if you change the voltage scale. However,
if the offset goes outside the selectable range, the offset is set to the maximum or minimum value for the
current voltage scale. If you set the vertical scale back to its original value without changing the offset, the
offset returns to its original value.
• The offset does not affect cursor-measurement values, automated measurement values of waveform
parameters, or computed values.
• You can change the position of the waveform relative to the vertical position (change the focus of the
vertical zoom) by changing the offset.
2 Vertical Axis