Offset - LeCroy HFP1500 Instruction Manual

HFP1500 High Frequency Probe

OFFSET

The HFP1500 has true offset capability. This allows you to remove a DC bias voltage from the
input signal while maintaining DC coupling. By using probe offset rather than the 'position' control
on the oscilloscope, the full dynamic range of the probe remains centered around the offset level,
preventing the oscilloscope from being overdriven and causing inaccurate measurements.
+18 V
+16 V
+14 V
+12 V
+10 V
+8 V
+6 V
+4 V
+2 V
0 V
–2 V
–4 V
–6 V
A
Input Waveform
With ±8 V dynamic range and ±12 V offset, the HFP1500 has a measurement range of ±20 V.
When the HFP1500 is used with a LeCroy oscilloscope equipped with ProBus interface, the probe
offset is controlled with the channel OFFSET knob.
At higher frequencies the maximum linear input voltage is reduced. Refer to Sec-
tion 9, Specifications, for the derating curve.
4–2
B
Waveform clipped
with offset
centered at 0 Volt
Figure 4-1. Dynamic Range and Offset Effects.
Note:
+18 V
+16 V
+14 V
+12 V
+10 V
+8 V
+6 V
+4 V
+2 V
±8 V
centered
0 V
at 0 V
Offset used to re-center
the dynamic range
around +10 V
±8 V
window
re-centered
around
probe offset
C
HFP1500-OM-E Rev E