Teledyne LeCroy ADP300_305 - Manual (Page 16)

ADP30x Probe
Operation with a Teledyne LeCroy Oscilloscope
When the ADP30x is connected to a Teledyne LeCroy oscilloscope, the displayed
scale factor and measurement values will be adjusted to account for the
effective gain of the probe.
Through the oscilloscope software, the probe’s internal attenuation and offset
can be conveniently controlled through the oscilloscope’s user interface.
Turning the V
OLTS
/D
IV
knob will control the oscilloscope’s scale factor and the
probe’s internal attenuation to give full available dynamic range from 1 V/div to
350 V/div for the ADP300, and from 200 mV/div to 350 V/div for the ADP305.
Some of the transition of the scale factor will result in a change of attenuation.
Smart Offset
The ADP30x has offset capability. This allows you to remove a DC bias voltage
from the differential input signal while maintaining DC coupling.
The offset range of the probe is a function of the oscilloscope’s sensitivity and
the probe’s attenuation. This ensures that the probe will never be overdriven on
screen. In addition, it will prevent the oscilloscope from being overdriven and
getting inaccurate measurements.
Bandwidth Limit (ADP305 only)
To comply with various test standards used for quantifying output noise of
power supplies, the ADP305 is capable of switching the bandwidth limit from Off
(maximum bandwidth) to 20 MHz in the channel Vertical Adjust dialog.
Auto Zero
The ADP30x incorporates an Auto Zero function to remove the DC offset from
the Differential Amplifier’s output. Auto Zero must be invoked by the user. You
may do this even while the probe is connected to a live circuit.
After several minutes of warm-up, or when the probe is exposed to a large shift
in ambient temperature, some DC offset drift may occur from thermal effects in
the amplifier. To initiate an Auto Zero cycle, select "AUTO ZERO" in the
oscilloscope’s user interface. During an Auto Zero cycle the oscilloscope will
automatically disconnect the ADP30x inputs from the circuit under test, perform
the auto zero function, and reconnect the inputs.
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