Rohde & Schwarz RT-ZHD60, RT-ZHD16, RT-ZHD07, RT-ZHD15 User Manual
R&S®RT-ZHD07/15/16/60
High Voltage Differential Probe
User Manual
(B0Iæ2)
1800.2588.02 ─ 01
User Manual
This User Manual describes the following R&S®RT-ZHD models and options:
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R&S®RT-ZHD07 (1800.2307.02)
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R&S®RT-ZHD15 (1800.2107.02)
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R&S®RT-ZHD16 (1800.2207.02)
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R&S®RT-ZHD60 (1800.2007.02)
© 2018 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 their owners.
The following abbreviations are used throughout this manual: R&S®RT-ZHD is abbreviated as R&S RT-ZHD. R&S®RTO is abbrevi-
ated as R&S RTO.
R&S®RT-ZHD07/15/16/60
Contents
1 Product Description...............................................................................5
2 Putting into Operation......................................................................... 20
3 Characteristics of Differential Probes................................................28
4 Typical Characteristics of the R&S RT-ZHD...................................... 33
5 Maintenance and Service.................................................................... 41
6 Dimensions of the Probe.....................................................................43
7 Functional Check................................................................................. 44
Contents
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Contents
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1 Product Description
Product Description
Key Features and Key Characteristics
1.1 Key Features and Key Characteristics
The R&S RT-ZHD high voltage differential probe is designed to safely measure high
voltage floating circuits using a grounded oscilloscope. The probe extends the measurement capability of oscilloscopes in measuring electronic power converters, inverters, motor speed controls, switch mode power supplies and many other applications.
The R&S RT-ZHD high voltage differential probe conforms to the safety requirements
for CAT III measurement instruments and pollution degree 2 according to IEC
61010-031. The maximum working voltage between each input lead and earth ground
applies for all attenuation settings.
Since the probe is equipped with Rohde & Schwarz probe interface, it can be connected to any Rohde & Schwarz base unit that is compatible with this interface. However
not all base units provide full software functionality.
1.1.1 Key Characteristics
The key characteristics of the probe are the following:
Figure 1-1: View of the probe
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Table 1-1: Key characteristics
Product Description
Key Features and Key Characteristics
Parameter R&S RT-ZHD07 R&S RT-
ZHD15/16
Bandwidth DC - 200 MHz DC - 100 MHz
(RT-ZHD15)
DC - 200 MHz
(RT-ZHD16)
Dynamic range
(differential input)
Operating voltage window
(each pin to GND)
Differential Offset ±1000 V ±2000 V ±2000 V
Diff. input resistance 5 MΩ 10 MΩ 40 MΩ
Diff. input capacitance 2.5 pF 2 pF 2 pF
R&S ProbeMeter, measurement error < 0.1 % < 0.1 % < 0.12 %
Maximum input voltage to earth (each terminal) 300 V CAT III
Attenuation high: ±750 V ±1500 V ±6000 V
Attenuation low: ±75 V ±150 V ±600 V
±750 V ±1500 V ±6000 V
1000 V CAT III
600 V CAT II
600 V RMS /
4500 V
PK
1000 V RMS/
6800 V
PK
R&S RT-ZHD60
DC - 100 MHz
1000 V CAT III
1750 V RMS/
6800 V
PK
1.1.2 Key Features
Micro button
The micro button is located at the probe head. The micro button can be configured via
the base unit. By pressing it, you can remotely control different functions on the base
unit.
For details, see Chapter 2.6, "Micro Button", on page 25.
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 in parallel to the time domain measurement.
If activated on the base unit, the measurement value is displayed on the screen of the
Rohde & Schwarz oscilloscope.
For details, see Chapter 2.8, "R&S ProbeMeter", on page 27.
The R&S ProbeMeter simultaneously records both differential and common mode DC
voltages.
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Overrange indication
There are two different indications for overrange:
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Input overrange indicates an overrange of an input signal against earth.
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Output overrange lights up if the differential voltage is too high even if the voltage
to earth is within the specification.
Each overrange condition is indicated by an individual red LED (3 LEDs in total) and a
common buzzer signal. The buzzer can be switched off.
Switchable bandwidth limit
The R&S RT-ZHD contains a switchable analog low pass with a cutoff frequency of 5
MHz. For measurements with long leads, it is convenient to reduce overshot and noise
by activating the bandwidth limit.
Switchable attenuation
The R&S RT-ZHD has three attenuation modes:
Product Description
Key Features and Key Characteristics
●
"Auto": (default on start-up and preset)
The attenuation of the probe is automatically selected by the oscilloscope and
depends on the vertical scaling of the scope.
●
"Attenuation high"
You can select the attenuation of the probe and it is not changed by the vertical
scope settings. In this mode, you reach the maximum measurable differential voltages.
●
"Attenuation low"
You can select the attenuation of the probe and it is not changed by the vertical
scope settings. If the attenuation is changed from "high" to "low", the sensitivity is
changed by the factor of 10 and the measurable differential voltage is divided by a
factor of 10.
Press the range button of the probe to change the mode.
Attenuation setting vs. maximum measurable voltages
The attenuation setting has only an impact on the maximum measurable differential
voltage between the two input voltages, but does not reduce the maximum input voltage itself.
Data memory
The probe includes an integrated data memory with individual probe correction parameters (e.g. gain, delay, offset). These correction parameters are read out and processed by the Rohde & Schwarz oscilloscope. As a result, the probe offers a high
degree of accuracy so that additional calibration procedures are not required.
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Product Description
Measurement Categories
1.2 Measurement Categories
To ensure safe operation of measurement instruments, IEC 61010-2-030 defines particular safety requirements for testing and measuring circuits. The standard introduces
measurement categories that rate instruments on their ability to resist short transient
overvoltages that occur in addition to the working voltage of the instrument and can
exceed the working voltage many times over.
Measurement categories are distinguished as follows:
●
O - Instruments without rated measurement category
For measurements performed on circuits not directly connected to mains, for example, electronics, circuits powered by batteries, and specially protected secondary
circuits. This measurement category is also known as CAT I.
●
CAT II:
For measurements performed on circuits directly connected to the low-voltage
installation by a standard socket outlet, for example, household appliances and
portable tools.
●
CAT III:
For measurements performed in the building installation, such as junction boxes,
circuit breakers, distribution boards, and equipment with permanent connection to
the fixed installation.
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CAT IV:
For measurements performed at the source of the low-voltage installation, such as
electricity meters and primary overcurrent protection devices.
Figure 1-2: Examples of measurement categories
The higher the category, the higher the expected transient overvoltage. Overvoltages
can overload a circuit and cause electrical and physical damage. Therefore, use the
measurement instrument only in electrical environments for which the instrument is
rated.
The measurement categories correspond to the overvoltage categories of the
IEC60664 standards. Working voltages stated in context with measurement categories
are always specified as effective voltages V (RMS) against earth ground.
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Product Description
Pollution Degrees
1.3 Pollution Degrees
The pollution degree classifies the amount of dry pollution and condensation that may
occur in the environment. Products must be used only in the environment for which
they are rated.
●
Pollution Degree 1:
No pollution or only dry, nonconductive pollution occurs. The pollution has no
effect. Products of this category are generally encapsulated, hermetically sealed,
or used only in clean rooms.
●
Pollution Degree 2:
Normally only dry, nonconductive pollution occurs. Occasionally a temporary conductivity that is caused by condensation must be expected. Temporary condensation occurs only when the product is out of service. The typical location is an office,
laboratory or home environment.
●
Pollution Degree 3:
Conductive pollution, or dry, nonconductive pollution that becomes conductive due
to condensation. The typical environment are sheltered locations where neither
temperature nor humidity is controlled, for example, industrial manufacturing areas.
The location is usually protected from direct sunshine, rain, and direct wind.
●
Pollution Degree 4:
The pollution generates persistent conductivity caused by conductive dust, rain, or
snow. This is typical for outdoor locations.
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Product Description
Precautions
1.4 Precautions
Shock hazard caused by high voltages
To avoid electric shock and personal injury, and to prevent damage to the probe or any
other products connected to it, observe the following instructions:
●
The probe and the measurement instrument must be grounded.
The probe is grounded with the shell of the BNC connector through the grounding
of the measurement instrument.
●
Never use the probe in measurement environments higher than measurement category III.
●
Do not apply effective voltages greater than the maximum rated voltage between
either input of the probe and earth ground, or between both inputs.
●
Make sure that all accessories comply with measurement category III. The accessory with the minor CAT value defines the CAT value of the whole measurement
chain.
●
Do not operate the probe without covers.
●
Do not use the probe in wet, damp or explosive atmospheres.
Make sure that the surface of the probe is completely dry before connecting the
inputs.
●
Avoid exposed circuitry. Do not touch exposed connections and components when
power is on.
Remove jewelry, watches, and other metallic objects.
●
Do not operate the probe if any part is damaged, or with suspected failures. If you
detect or suspect any damage to the probe, have it inspected by qualified service
personnel.
Operating only by electrically skilled persons
Voltages higher than 30 V RMS or 42 V peak or 60 V DC are regarded as hazardous
contact voltages. Make sure that only electrically skilled persons may use the R&S
ZHD for measurements on hazardous contact voltages. This working condition require
special education and experience to perceive risks and to avoid hazards which electricity can create.
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Product Description
Unpacking the Instrument
1.5 Unpacking the Instrument
Figure 1-3: R&S RT-ZHD probe with accessories
The following items are included in the delivery:
●
R&S RT-ZHD high voltage differential probe
●
Carrying case
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Pince clip (black and red)
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Safety Alligator clips (black and red)
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Test clips (black and red)
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Leads 17 cm (black and red)
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Leads 100 cm (black and red)
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Spade terminal (black and red)
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Test Leads (black and red)
●
User manual
●
R&S RT-ZHD data sheet
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Calibration certificate
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Documented calibration values (if ordered)
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Two hinged ferrite cores with opening key
1.5.1 Inspecting the Contents
●
Inspect the package for damage.
Keep a damaged package and the cushioning material until the contents have
been checked for completeness and the device has been tested.
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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.
●
Inspect the probe.
If there is any damage or defect, or if the R&S RT-ZHD high voltage differential
probe does not operate properly, notify your Rohde & Schwarz service center.
●
Inspect the accessories.
If the contents are incomplete or damaged, notify your Rohde & Schwarz service
center.
Accessories supplied with the device are listed in Chapter 1.6.6, "Accessories and
Items", on page 17.
Product Description
Description of the Probe
1.6 Description of the Probe
The R&S RT-ZHD consists of the probe control box, two input leads, a probe cable and
a probe box.
Figure 1-4: R&S RT-ZHD probe
1 = Probe control box
2 = Input leads
3 = Safety banana plug (4 mm)
4 = Probe cable
5 = Probe box
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Product Description
Description of the Probe
1.6.1 Probe Control Box
Contains the high-voltage divider, the active differential amplifier and other electronic
components. All components are designed to ensure safe operation at hazardous contact voltages within the specified working voltage and measurement category. In particular, all air gaps and creeping distances comply with all current safety standards to
protect the user, the measurement object, and the probe against any harm or damage.
The active differential amplifier takes the difference between the positive and negative
signal input voltages. The probe transfers this difference signal to the oscilloscope.
Common mode voltages are rejected.
The controls and indicators of the probe control box are described in Chapter 1.6.5,
"Controls and Indicators", on page 15.
1.6.2 Probe Cable
Connects the probe control box to the probe box. Its length of around 150 cm allows
for a comfortable working distance to the base unit.
1.6.3 Input Leads
Provide flexible contact to the DUT even in confined physical conditions. The input
leads are pluggable and can easily be substituted by other measurement leads with a
4 mm safety banana plug. However, the maximum performance can only be achieved
with the delivered short leads (17 cm) in combination with the safety alligator clips. The
4 mm safety banana plugs can be used to contact the DUT directly, or to connect suitable contact accessories like the pince clip delivered with the probe.
See also: Chapter 2.4, "Connecting the Probe to the DUT", on page 23.
1.6.4 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 simultaneously transmit analog signals and
digital data. 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.
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Risk of interface damage
Connect the probe only to a base unit or an adapter that has a Rohde & Schwarz interface. Do not connect the probe to a commercially available BNC jack, as this can
cause irreparable damage to the interface. From the outside, the 7 mm coaxial connector looks like a standard BNC connector. However, it is constructed differently and is
capable of a significantly higher frequency limit.
Product Description
Description of the Probe
(1) Rohde & Schwarz probe interface with 7 mm
(276 mil) coaxial connector and 6 pogo pins
(2) Release knob
Shock hazard caused by high voltages
The attached input leads have a jacket wear indicator. If the input lead's jacket is
excessively worn, a different jacket color becomes visible. If you see this color indicator, do not use the probe lead.
If other input leads were used, make sure that they fulfil the safety requirements for
your measurement. Do not use 4 mm banana plugs without protection against contact.
Influence of the accessory to the CAT rating
The CAT rating goes along with the minor rating of the accessory used for a specific
measurement. E.g. the usage of the spade terminals reduces the CAT of the whole
measurement set to CAT II. This is independent from the used R&S RT-ZHD.
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