Teledyne Lecroy HVD3000 Series Operator's Manual page 41

The total usable offset of the oscilloscope and probe system is a function of the
oscilloscope V/div setting and offset at that V/div setting, and the probe attenuation and
offset at that attenuation setting. Total maximum offset may be calculated as:
Oscilloscope Front End V/Div = (Probe and Oscilloscope) V/Div ÷ Probe_Attenuation
Once the oscilloscope front end V/div value is known, it is possible to know the maximum
oscilloscope offset available at this V/div setting either by referencing the oscilloscope
specifications or setting the maximum offset value on the oscilloscope for that V/div
setting. Maximum offset for the probe and oscilloscope combination can then be
calculated as:
Max Positive Offset Available
Oscilloscope Positive Offset (at Oscilloscope Front End V/div) * Probe Attenuation– 10V
Max Negative Offset Available
Oscilloscope Negative Offset (at Oscilloscope Front End V/div) * Probe Attenuation + 10V
In both cases, the maximum offset available cannot exceed the following:
X50
3102A NA
3106A ±150 V
3206A ±150 V
3220 ±150 V
3605A NA
Note: The offset reported on channel descriptor boxes may deviate slightly from expected
values per the formulas above. Reported probe attenuation is a "nominal" value and can
deviate slightly from the actual calibrated value stored with the probe. The actual offset
value uses the actual "as measured" probe attenuation value. This provides for higher DC
and low frequency gain accuracy than would otherwise be possible.
AC Coupling
In general, using offset to adjust a differential DC voltage on the screen is the preferred
method to measure transient signals in the presence of a larger DC voltage. The offset has
limits that will cause a signal that is beyond the linear operating range of the probe to go
Max Positive Offset (Probe and Oscilloscope together) =
Max Negative Offset (Probe and Oscilloscope together) =
X100
±150 V
NA
NA
±300 V
NA
EAR99 technology subject to restrictions on copyrights page.
X200 X250
NA NA
NA NA
NA NA
NA ±750 V
±600 V NA
Operator's Manual
X500 X1000
NA ±1500 V
±1500 V NA
±1500 V NA
±1500 V NA
NA NA
X2000
NA
NA
NA
NA
±6000 V
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