®
R&S
RT-ZD40
Active Differential Probe
User Manual
(>:ÃÍ2)
1410536302
Version 05
User Manual
This User Manual describes the following R&S®RT-ZD models and options:
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R&S®RT-ZD40 (1410.5205.02)
© 2019 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1410.5363.02 | Version 05 | R&S®RT-ZD40
Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol and without
product type numbers, e.g. R&S®RT-ZD40 is indicated as R&S RT-ZD40.
R&S®RT-ZD40
Contents
Contents
1 Product Description.............................................................. 5
1.1 Key Features and Key Characteristics............................................... 5
1.1.1 Key Characteristics................................................................................. 5
1.1.2 Key Features...........................................................................................6
1.2 Unpacking..............................................................................................7
1.2.1 Inspecting the Contents.......................................................................... 7
1.3 Description of the Probe...................................................................... 8
1.3.1 Probe Head.............................................................................................8
1.3.2 Probe Box............................................................................................... 9
1.4 Accessories and Items....................................................................... 10
1.4.1 Accessories Supplied............................................................................11
1.4.2 Optional Accessories............................................................................ 12
1.4.3 Service Accessories..............................................................................13
2 Putting into Operation.........................................................14
2.1 Connecting the Probe to the Oscilloscope...................................... 15
2.2 Identification of the Probe..................................................................16
2.3 Using the Probe.................................................................................. 16
2.3.1 Zero Adjustment....................................................................................16
2.3.2 Micro Button..........................................................................................17
2.4 Offset Compensation..........................................................................17
2.4.1 Differential Offset.................................................................................. 17
2.4.2 Common Mode Offset...........................................................................18
2.4.3 R&S ProbeMeter...................................................................................20
3 Connecting the Probe to the DUT...................................... 22
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R&S®RT-ZD40
Contents
4 Characteristics of Differential Probes............................... 27
4.1 Common Mode Rejection Ratio (CMRR)...........................................28
4.2 Dynamic Range and Operating Voltage Window............................. 29
4.3 Ground Connection............................................................................ 30
5 Measurement Principles..................................................... 31
5.1 Signal Integrity of the Transferred Signal.........................................33
5.1.1 Bandwidth............................................................................................. 33
5.1.2 Connection Inductance......................................................................... 34
5.1.3 CMRR................................................................................................... 37
5.2 Signal Loading of the Input Signal....................................................37
5.2.1 Signal Loading for Differential Input Signals......................................... 38
5.2.2 Signal Loading for Non-Differential Input Signals................................. 40
5.3 Probing Philosophy............................................................................ 40
6 Maintenance and Service....................................................42
6.1 Cleaning...............................................................................................42
6.2 Contacting Customer Support...........................................................42
6.3 Returning for Servicing...................................................................... 43
6.4 Calibration Interval............................................................................. 44
6.5 Discarding the Product...................................................................... 44
6.6 Spare Parts.......................................................................................... 44
7 Functional Check.................................................................47
Index..................................................................................... 48
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R&S®RT-ZD40
Key Features and Key Characteristics
Product Description
1 Product Description
1.1 Key Features and Key Characteristics
The R&S RT-ZD40 is a differential probe with high input impedance. It is used for
differential voltage measurements from DC to 4.5 GHz.
Differential probes can be used for single-ended and differential applications.
They are equipped with two high-impedance inputs and can measure the voltage
between any two test points. Unlike using single-ended probes, there is no need
to ensure that one of the test points is always at ground potential.
The comprehensive accessory set allows this probe to be connected to a wide
variety of devices under test (DUT). Provided with special features such as the
R&S ProbeMeter and the micro button, the R&S RT-ZD40 is designed to meet
tomorrow's challenges in probing.
The probe is equipped with theRohde & Schwarz probe interface. It can be connected to any Rohde & Schwarz instrument that is compatible with this interface.
When connected to the front panel, the probe is controlled by the oscilloscope's
software. Supported oscilloscopes are listed in the data sheet.
Using a specially developed adapter (see Chapter 1.4.2, "Optional Accessories",
on page 12), the probe can also be connected to any other base unit.
1.1.1 Key Characteristics
The key characteristics of the probe are the following:
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R&S®RT-ZD40
Key Features and Key Characteristics
Bandwidth DC to 4.5 GHz
Product Description
Dynamic range
(differential input)
Operating voltage window
(each pin to GND)
Maximum non-destructive input voltage ±30 V
Diff. input resistance 1 MΩ
Diff. input capacitance 0.4 pF
R&S ProbeMeter, measurement error <0.1 %
Extremely low zero and gain errors throughout the entire temperature range, no significant temperature drift
Micro button
Rohde & Schwarz probe interface
±5 V with ±5 V offset capability
10 V AC (Vpp)
±8 V with ±22 V common mode offset capability
Available for R&S RT-ZD40 probes with serial number
≥ 200000
Between each signal pin and ground
1.1.2 Key Features
Micro button
The micro button at the probe head can remotely control different functions on the
base unit. The assigned function is configured via the base unit.
For details, see Chapter 2.3.2, "Micro Button", on page 17.
R&S ProbeMeter
The R&S ProbeMeter measures the DC voltage of the input signal directly at the
probe tip. It provides a continuous high-precision DC voltage measurement that is
independent of the settings of the oscilloscope and runs in parallel to the time
domain measurement. If activated on the base unit, the measured value is displayed on the screen of the Rohde & Schwarz oscilloscope.
The R&S ProbeMeter simultaneously measures both differential and common
mode DC voltages.
For details, see Chapter 2.4.3, "R&S ProbeMeter", on page 20.
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R&S®RT-ZD40
Product Description
Unpacking
Data memory
The probe has an integrated data memory, containing the individual probe correction parameters (e.g. gain, delay, offset). These parameters are read out and processed by the Rohde & Schwarz oscilloscope. As a result, the probe offers a high
degree of accuracy, and additional calibration procedures are not required.
1.2 Unpacking
The carrying case contains the following items:
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R&S RT-ZD40 differential probe
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Carrying case
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Accessory boxes
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User manual
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R&S RT-ZD40 data sheet
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Calibration certificate
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Documentation of calibration values (if
ordered)
1.2.1
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Inspect the package for damage.
Inspecting the Contents
Keep the package and the cushioning material until the contents have been
checked for completeness and the device has been tested.
If the packaging material shows any signs of stress, notify the carrier and your
Rohde & Schwarz service center. Keep the package and cushioning material
for inspection.
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Inspect the probe.
If there is any damage or defect, or if the R&S RT-ZD40 differential probe
does not operate properly, notify your Rohde & Schwarz service center.
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Inspect the accessories.
If the contents are incomplete or damaged, notify your Rohde & Schwarz service center.
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R&S®RT-ZD40
Product Description
Description of the Probe
Accessories supplied with the device are listed in Chapter 1.4.1, "Accessories
Supplied", on page 11.
1.3 Description of the Probe
The probe consists of the probe head for connection to the DUT, the probe box
for connection to the oscilloscope, and the probe cable.
1.3.1 Probe Head
The small and lightweight probe head is designed for easy handling and high-performance measurements. The probe head is used for connecting the probe and
the DUT. Different accessories for the signal and ground sockets allow the probe
head to be connected to a wide range of DUTs.
(1) Positive signal socket
(2) Negative signal socket
(3) Ground socket
(4) Micro button
The accessories supplied for the probe head
sockets are listed in Chapter 1.4.1, "Accesso-
ries Supplied", on page 11.
The ground socket is compatible with 0.64 mm
(25 mil) square pins and 0.6 mm to 0.8 mm
(24 mil to 35 mil) round pins.
Spacing of signal sockets: 4 mm (160 mil).
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R&S®RT-ZD40
Product Description
Description of the Probe
Special accessories for signal sockets
The signal sockets of R&S RT-ZD40 have a special design to ensure optimal performance. The signal sockets are not compatible to standard accessories based on 0.64 mm (25 mil) square pins or 0.8 mm (35 mil) round
pins. Use only special accessories for R&S RT-ZD40 provided by
Rohde & Schwarz.
1.3.2 Probe Box
The probe box connects the probe and the oscilloscope via the Rohde & Schwarz
probe interface. The Rohde & Schwarz probe interface contains a male precision
7 mm (276 mil) BNC connector and six pogo pin connectors. This interface provides the required supply voltage and is also used to transmit analog signals and
digital data simultaneously. All the analog voltages required by the probe are generated in the probe box. This approach ensures that it will be possible to operate
future probes on any base unit that features a Rohde & Schwarz probe interface.
(1) Rohde
7 mm (276 mil) coaxial connector and 6 pogo
pins
(2) Release knob
& Schwarz probe interface with
Connect the R&S RT-ZD40 only to an instrument with Rohde & Schwarz probe
interface. Never connect it to a usual BNC jack. Although the 7 mm coaxial connector looks like a standard BNC connector, it is constructed differently and does
not fit to the standard BNC jack. The interface of the R&S RT-ZD40 can withstand
a higher frequency limit.
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R&S®RT-ZD40
Product Description
Accessories and Items
1.4 Accessories and Items
The figure below shows all accessories that are available for the R&S RT-ZD40
differential probe.
Figure 1-1: Available accessories
The R&S RT-ZA15 external attenuator is not a accessory of the R&S RT-ZD40.
Putting the R&S RT-ZA15 on the R&S RT-ZD40 can damage both parts mechanically.
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R&S®RT-ZD40
Product Description
Accessories and Items
1.4.1 Accessories Supplied
The following table shows the accessories supplied with the R&S RT-ZD40 differential probe.
Table 1-1: Accessories supplied
Item Quantity Description
100 Signal pin, solder-in
2
2 Browser adapter, rigid
2
2 Lead, 6 cm / 2.4 in
1 Lead, 15 cm / 5.9 in
Socket adapter, variable
spacing
Browser adapter, spring-
loaded
2 Mini clip
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R&S®RT-ZD40
Item Quantity Description
Product Description
Accessories and Items
2 Micro clip
1 Marker band kit
1
Carrying case with foam
inlay
For a list of spare parts, see Chapter 6.6, "Spare Parts", on page 44.
1.4.2 Optional Accessories
If the delivered accessories do not meet individual customer requirements,
Rohde & Schwarz offers different accessory sets for sale. The order numbers are
provided in the data sheet.
Table 1-2: R&S RT‑ZA4 mini clips
Item Quantity Description
Mini clip 10 Contains mini clips.
Table 1-3: R&S RT‑ZA5 micro clips
Item Quantity Description
Micro clip 4 Contains micro clips.
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R&S®RT-ZD40
Product Description
Accessories and Items
Table 1-4: R&S RT‑ZA6 lead set
Item Quantity Description
Lead, 6 cm / 2.4 in
Lead, 15 cm / 5.9 in
Table 1-5: R&S RT‑ZA8 differential pin set
Item Quantity Description
Signal pin, solder-in
Socket adapter, variable spacing
Browser adapter, rigid
Browser adapter, spring-loaded
Table 1-6: R&S RT‑ZA9 probe box to N / USB adapter
The adapter can be used to connect the R&S RTZD40 differential probe to any other oscilloscope or
any other measurement instrument (e.g. a network
or spectrum analyzer).
Using the USB interface of the adapter, the probe
can be powered and controlled from any conventional PC.
5
5
100
2
2
2
Contains short and long leads.
Contains the pins available for
the R&S RT-ZD40.
1.4.3 Service Accessories
To order accessories for servicing the probe, contact your Rohde & Schwarz service center. The following accessories are available:
Table 1-7: Service accessories
Item Description
R&S RT-ZK2 The service kit is used to calibrate the probe, to do perform-
ance tests, and for servicing. The service kit includes all
adapters and accessories to connect the probe to the
required measuring instruments.
R&S RT-ZD40 Service Manual The service manual contains a detailed description of the
performance test to verify the specifications, and other
important service procedures.
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R&S®RT-ZD40
Putting into Operation
2 Putting into Operation
The probe is designed for usage with oscilloscopes that have a Rohde & Schwarz
probe interface. Supported Rohde & Schwarz oscilloscopes are listed in the probe's data sheet.
Read and observe the printed "Basic Safety Instructions" that are delivered with
the probe. Also, read and observe the safety instructions of the oscilloscope the
probe is connected to.
Maximum non-destructive input voltage
The maximum non-destructive input voltage is ±30 V. A higher input voltage
can destroy the probe. The maximum non-destructive input voltage of a differential probe is specified as the maximum voltage between each signal
pin and ground. The maximum input voltage is derated for higher frequencies. Refer to the data sheet for further information.
Risk of device damage
The R&S RT-ZD40 can withstand a moderate amount of physical and electrical stress. To avoid damage, treat the probe with care:
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Do not exceed the specified voltage limits.
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Connect the R&S RT-ZD40 only to an instrument with Rohde & Schwarz
probe interface. Never connect it to a usual BNC jack. Although the
7 mm coaxial connector looks like a standard BNC connector, it is constructed differently and does not fit to the standard BNC jack. The interface of the R&S RT-ZD40 can withstand a higher frequency limit.
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Handle the probe by the probe head or probe box. Avoid excessive
strain on the probe cable, and kinking.
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Prevent the probe from receiving mechanical shock.
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Do not spill liquids on the probe.
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Store the probe in a shock-resistant case, e.g. in the shipping case.
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R&S®RT-ZD40
Connecting the Probe to the Oscilloscope
During usage, the probe slightly heats up. Warming is normal behavior and not a
sign of malfunction.
Damage caused by electrostatic discharge
Electrostatic discharge (ESD) can damage the electronic components of the
probe and the instrument, and also the device under test (DUT). Electrostatic discharge is most likely to occur when you connect or disconnect a
DUT or test fixture to the probe and to the instrument's test ports. To prevent electrostatic discharge, use a wrist strap and cord and connect yourself to the ground, or use a conductive floor mat and heel strap combination. Discharge cables and probe tips before you connect them.
Putting into Operation
2.1 Connecting the Probe to the Oscilloscope
► Connect the probe box (1) to the Rohde & Schwarz probe interface of the
oscilloscope (2).
The probe snaps in when connected properly to the port.
Figure 2-1: Connecting the probe to the Rohde & Schwarz oscilloscope
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