Getting Started Manual
WR6Zi-GSM-E
36
ProBus is based on a BNC connector and, depending on the exact BNC
connector used and the oscilloscope design, is rated for up to 4 GHz with
50 Ω coupling or up to 1 GHz for 1 MΩ coupling (depending on the exact
model purchase).
Probes
LeCroy offers a variety of passive and active probes for use with your X-
Stream oscilloscope. Visit
www.lecroy.com
for specifications and
ordering information.
Current Probes
- Current Probes measure the current passing
through a wire; current probes do not use the traditional probing
style of placing a tip onto a test point. Instead, a wire is placed
inside the jaw of the probe, which allows the probe to measure
the current (in Amps).
Active Probes
- There are two different types of active probes:
single-ended
and
differential
.
Single-Ended
- A single-ended active probe is associated with
measuring voltages at high frequencies. Measurement with an
active probe requires a test point and a ground point. The ground
(also called earth) acts as a zero reference for the test point
measurement.
Differential Probes
- Differential active probes are like two probes
in one. Instead of measuring a test point in relation to a ground
point (like single-ended active probes), differential probes
measure the difference in voltage of a test point in relation to
another test point.
Passive Probes
- Passive probes measure voltages at lower
frequencies (<500 MHz). They have higher input capacitance
(input C) and do not need power to operate (unlike active probes).
At higher frequencies, higher input capacitance loads the test
circuit, attenuating the signal. This is why active probes are used in
high frequency applications. Passive probes also measure voltage
in reference to ground.
