Teledyne Lecroy HVD3000 Operator's Manual page 34

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
off the screen, preventing measurement errors.
There are times, however, when it is convenient to use AC coupling to remove the DC
component of the measured signal from the measurement. Selecting AC10MΩ uses the
scope AC coupling at the probe output to remove any steady state value from the displayed
voltage. The maximum linear input voltage is as follows:
3102 / 3102A
3106 / 3106A
3206 / 3206A
3605 / 3605A
NOTE: Because AC coupling is on the probe output, DC voltages beyond the probe's linear
range will cause the amplifier to saturate and inaccurately render the displayed waveform.
Do not exceed the maximum linear input value when using AC coupling.
Bandwidth Limiting
To comply with various test standards used for quantifying output noise of power supplies,
the probe is capable of switching the bandwidth limit from Off (maximum bandwidth) to 20
MHz in the channel Vertical Adjust dialog.
Voltage Range
On oscilloscopes running XStreamDSO v.8.5.x.x and higher, there are two options as to how
the probe will set attenuation relative to the oscilloscope's V/div setting:
Auto will automatically raise the attenuation when the V/div setting is >7.9V/div or lower
the attenuation when the V/div is <7.9V/div. As a result the probe can automatically adjust
attenuation to properly view the input waveform.
Lock to High locks the attenuation setting to the highest attenuation, regardless of the
V/div setting. Maintaining a high attenuation will allow small signals on a larger voltage
waveform to be accurately measured.
1.800.561.8187
X50 X100 X200
<7 V/div <7 V/div <28 V/div
NA 200 Vpk NA
200 Vpk NA NA
200 Vpk NA NA
NA NA 760 Vpk
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Operator's Manual
X500 X1000 X2000
>7 V/div >7 V/div >28 V/div
NA 1750 Vpk NA
2000 Vpk NA NA
2000 Vpk NA NA
NA NA 7600 Vpk
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