Adding Offset - LeCroy AP034 Instruction Manual

ADDING OFFSET

+700 mV
+500 mV
+300 mV
0 mV
Input Differential
Waveform
²
The AP034 Active Differential Probe has true differential offset
capability. This allows you to remove a DC bias voltage from the
differential input signal while maintaining DC coupling. By using
probe offset rather than the P
the full dynamic range of the probe remains centered around the
offset level.
+700 mV
+500 mV
+400 mV
+300 mV
0 mV
-400 mV
Waveform "clipped"
with no offset
When the AP034 Active Differential Probe is used with a LeCroy
oscilloscope equipped with ProBus interface, the probe offset
can be controlled with the channel O
the probe housing will be disabled.
When used with the ADPPS Power Supply on instruments that
lack ProBus support, offset can be controlled with the buttons on
the probe's front panel. The offset can be returned to zero at any
time by briefly pressing both the Î and Ï O
same time. Pressing both the Î and Ï O
than 2 seconds will initiate an Autobalance cycle.
Probe offset is controlled with the channel
O
FFSET
8.1.0 or higher. The current offset value is
ISSUED: January 2000
$3 $FWLYH 3UREH
control on the oscilloscope,
OSITION
+700 mV
+500 mV
+300 mV
±400 mV
centered
0 mV
at 0 V
Offset used to re-center
the differential dynamic
range around +500 mV
Figure 4. Effect of Differential Offset
FFSET
*Note
knob in oscilloscope software versions
±400 mV window
re-centered around
the probe offset.
knob.* The buttons on
buttons at the
FFSET
buttons for more
FFSET
AP034-OM-E Rev D