Rohde & Schwarz MXO 4 Series - Page 132

Acquisition and waveform setupMXO 4 Series
132User Manual 1335.5337.02 ─ 07
CM offset
Sets the common-mode offset to compensate for a common DC voltage that is applied
to both input sockets (referenced to the ground socket). The setting is available for
Rohde & Schwarz differential probes and for modular probes in CM measurement
mode.
Offset compensation is particularly helpful for measurements on differential signals with
high common mode levels, for example, current measurements using a shunt resistor.
You can measure the common mode input voltage using the R&S ProbeMeter.
Remote command:
PROBe<ch>:SETup:CMOFfset on page 527
RT-ZA15 attenuator
If you use the external attenuator R&S RT-ZA15 together with one of the differential
active probes R&S RT-ZD10/20/30, enable "RT-ZA15 attenuator" to include the exter-
nal attenuation in the measurements.
Remote command:
PROBe<ch>:SETup:ZAXV on page 528
Display
Selects the voltage to be measured by the ProbeMeter of differential active probes:
●
"Differential / Common Mode":
Differential voltage is the voltage between the positive and negative signal sockets.
Common mode voltage is the mean voltage between the signal sockets and the
ground socket. It measures the voltage level relative to ground, for example, to
check the operating voltage window.
●
"Single Ended Pos/Neg":
Measures the voltage between the positive/negative signal socket and the ground.
The ProbeMeter always measures the common mode and differential voltages.
Single-ended voltages are calculated values:
V
p
= V
cm
+ 0.5 * V
in
and V
n
= V
cm
- 0.5 * V
in
Remote command:
PROBe<ch>:SETup:DISPlaydiff on page 527
6.4.3.3 Setup for R&S RT‑ZPR power rail probes
R&S RT‑ZPR power rail probes are designed for power integrity measurements. They
can measure small signals in the millivolt range with large DC-offset components.
R&S RT‑ZPR power rail probes have the Rohde & Schwarz probe interface and sup-
port the ProbeMeter, but not the micro button. For details, see Chapter 6.4.3.1, "Set-
tings for the Rohde & Schwarz probe interface", on page 130.
R&S RT‑ZPR probes require 50 Ω input termination.
Probes