R&S®RT-ZHD07/15/16/60 High Voltage Differential Probe User Manual (B0Iæ2) User Manual 1800.2588.
This User Manual describes the following R&S®RT-ZHD models and options: ● R&S®RT-ZHD07 (1800.2307.02) ● R&S®RT-ZHD15 (1800.2107.02) ● R&S®RT-ZHD16 (1800.2207.02) ● 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®RT-ZHD07/15/16/60 Contents 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..................................................................
R&S®RT-ZHD07/15/16/60 User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Product Description Key Features and Key Characteristics 1 Product Description 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.
R&S®RT-ZHD07/15/16/60 Product Description Key Features and Key Characteristics Table 1-1: Key characteristics Parameter R&S RT-ZHD07 R&S RTZHD15/16 R&S RT-ZHD60 Bandwidth DC - 200 MHz DC - 100 MHz (RT-ZHD15) DC - 100 MHz DC - 200 MHz (RT-ZHD16) Attenuation high: ±750 V ±1500 V ±6000 V Attenuation low: ±75 V ±150 V ±600 V ±750 V ±1500 V ±6000 V Differential Offset ±1000 V ±2000 V ±2000 V Diff. input resistance 5 MΩ 10 MΩ 40 MΩ Diff. input capacitance 2.
R&S®RT-ZHD07/15/16/60 Product Description Key Features and Key Characteristics Overrange indication There are two different indications for overrange: ● Input overrange indicates an overrange of an input signal against earth. ● 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.
R&S®RT-ZHD07/15/16/60 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.
R&S®RT-ZHD07/15/16/60 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.
R&S®RT-ZHD07/15/16/60 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.
R&S®RT-ZHD07/15/16/60 Product Description Unpacking the Instrument 1.
R&S®RT-ZHD07/15/16/60 Product Description Description of the Probe 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.
R&S®RT-ZHD07/15/16/60 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.
R&S®RT-ZHD07/15/16/60 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 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.
R&S®RT-ZHD07/15/16/60 Product Description Description of the Probe 1.6.5 Controls and Indicators Figure 1-5: Probe control box 1 2 3 4 5 6 = = = = = = Overrange indicators at each of the inputs Overrange indicator at the output Attenuation ratio switch Bandwidth limit 5 MHz Audible overrange on/off Micro Button (function programmable) Attenuation ratio switch Sets the attenuation dependent of the probe: User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Product Description Description of the Probe Table 1-2: Attenuation and maximum peak voltages of R&S RT-ZHD Probe type Attenuation high (att. high) Attenuation low (att. low) Att. Max. Voltage Att. Max. Voltage RT-ZHD07 250 : 1 750 Vpk 25 : 1 75 Vpk RT-ZHD15/16 500 : 1 1500 Vpk 50 : 1 150 Vpk RT-ZHD60 1000 : 1 6000 Vpk 100 : 1 600 Vpk The setting with lower attenuation is characterized by less noise.
R&S®RT-ZHD07/15/16/60 Product Description Description of the Probe 1.6.6 Accessories and Items 1.6.6.1 Accessories Supplied Table 1-3 shows the accessories that are supplied with the R&S RT-ZHD high voltage differential probe.
R&S®RT-ZHD07/15/16/60 Product Description Description of the Probe Item Quantity Description 2 Long Leads (100cm) Maximum rating: 1000 V (RMS) CAT III 2 Short Leads (17cm) Maximum rating: 1000 V (RMS) CAT III 2 Test leads Maximum rating: 1000 V (RMS) CAT III 1 Two hinged ferrite cores With key for easier opening 1 User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Product Description Description of the Probe Shock hazard caused by high voltages Always check the working voltage and measurement category of the accessory. If these values are smaller than the values of the R&S RT-ZHD probe, make sure not to exceed the accessory limits. 1.6.6.2 Service Accessories To order accessories for servicing the probe, contact your Rohde & Schwarz service center.
R&S®RT-ZHD07/15/16/60 Putting into Operation 2 Putting into Operation The R&S RT-ZHD high voltage differential probe has been designed to withstand a moderate amount of physical and electrical stress. Treat the probe with care. It can be damaged if excessive force is applied to it. 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, make sure that the shell of the BNC output connector (see Chapter 1.6.
R&S®RT-ZHD07/15/16/60 Putting into Operation Connecting the Probe to the Oscilloscope 2.1 Installation This section introduces the use of the R&S RT-ZHD high voltage differential probe, which has been designed for use with Rohde & Schwarz oscilloscopes. Supported oscilloscopes All settings of the base unit described in this section refer to Rohde & Schwarz oscilloscopes. These base units support the full software functionality of the R&S RT-ZHD probes.
R&S®RT-ZHD07/15/16/60 Putting into Operation Identification of the Probe Figure 2-2: Checking the performance of R&S RT-ZHD and the R&S RTO 2.3 Identification of the Probe When the probe is connected to the oscilloscope, the oscilloscope recognizes the probe and reads out the probe-specific parameters. User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Putting into Operation Connecting the Probe to the DUT The oscilloscope settings for attenuation and offset are automatically adjusted. As soon as the probe is connected to the oscilloscope and the settings are adjusted, the waveform is shown for the channel to which the probe is connected. 1. On the "Vertical" menu, select "Probe Setup". 2. On the left side of the "Setup" tab, select the channel to which the probe is connected.
R&S®RT-ZHD07/15/16/60 Putting into Operation Reducing noise induction Figure 2-3: Hand held / unsafe areas 3. Connect the clips to the DUT. 4. Connect the input leads to the probe control box (4 mm safety banana jack). Shock hazard caused by high voltages Disconnect the probe from the DUT before disconnecting the probe from the measuring instrument. Keep the probe control box and the probe cable away from the circuit being measured. 2.
R&S®RT-ZHD07/15/16/60 Putting into Operation Offset Compensation Figure 2-4: Leads, untwisted Figure 2-5: Leads, twisted 2.6 Micro Button The micro button provides easy and quick access to important functions of the Rohde & Schwarz oscilloscope. After a function has been assigned, pressing the micro button remotely controls this specific function on the base unit. For example, "Continuous Run" and "AutoZero" are commonly assigned to the micro button.
R&S®RT-ZHD07/15/16/60 Putting into Operation Offset Compensation Figure 2-6: Differential offset compensation voltage for single-ended measurement (negative signal socket connected to ground e.g. RT-ZHD15 attenuation low) Only differential DC offsets can be compensated. It is not possible to compensate for common mode DC offsets using the offset compensation function. For a definition of differential and common mode input voltages, see Chapter 3, "Characteristics of Differential Probes", on page 28.
R&S®RT-ZHD07/15/16/60 Putting into Operation R&S ProbeMeter 2.8 R&S ProbeMeter The integrated voltmeter can measure DC voltages with high precision compared to the oscilloscope's DC accuracy. The DC measurement is performed continuously and in parallel to the time domain measurement of the oscilloscope. High-precision measurements are achieved through immediate digitization of the measured DC voltage at the probe control box.
R&S®RT-ZHD07/15/16/60 Characteristics of Differential Probes 3 Characteristics of Differential Probes A differential probe has three sockets: the positive signal socket (+), the negative signal socket (-), and the signal output which is connected to ground.
R&S®RT-ZHD07/15/16/60 Characteristics of Differential Probes Dynamic Range and Operating Voltage Window In this equation, Avdm is the amplification of the differential mode input voltage and Avcm is the amplification of the common mode input voltage. An ideal differential probe is expressed as Avdm = 1 and Avcm = 0. In this case, the displayed voltage exactly equals to the differential input voltage Vin between the two signal sockets, and the common mode input voltage is suppressed. 3.
R&S®RT-ZHD07/15/16/60 Characteristics of Differential Probes Dynamic Range and Operating Voltage Window tation is referred to as the operating voltage window (some manufacturers also use the less precise term "common mode range" for the same parameter). If one of these ranges is exceeded, an unwanted signal clipping may occur. Figure 3-2: Dynamic range and operating voltage window for both attenuation ratios 50:1 and 500:1 (e.g.
R&S®RT-ZHD07/15/16/60 Characteristics of Differential Probes Dynamic Range and Operating Voltage Window Figure 3-3: Signal curves (e.g. R&S RT-ZHD15) a) = Two signals of ±750 V and opposing phase are applied to positive and negative inputs. At the peaks, the probe is driven with an input voltage of ±1500 V between the positive and negative signal pin. The dynamic range limit is reached. b) = The negative signal pin is connected to ground, the positive pin is driven with an input voltage of ±1500 V.
R&S®RT-ZHD07/15/16/60 Characteristics of Differential Probes Maximum Voltage Input 3.3 Maximum Voltage Input The R&S RT-ZHD high voltage differential probe is rated for CAT III environments with following maximum working voltages between each input lead and earth ground.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD Improve the Signal Integrity 4 Typical Characteristics of the R&S RT-ZHD The R&S RT-ZHD differential probe provides an electrical connection between the DUT and the oscilloscope. The probe transfers the voltage of the electrical signal tapped off the DUT to the oscilloscope, where it is displayed graphically.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD Bandwidth Figure 4-2: Improvement with additional hinged ferrite cores In Figure 4-2, you can see the improvement in the signal integrity. The curve "Step with ferrite" is artificially delayed for 8 ns for a better view. The ferrite cores do not add any additional delay. The most significant improvement can be seen with the R&S RTZHD60 in the "Mode">"Attenuation High" and 5 MHz low pass (LP) on. 4.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD Bandwidth Figure 4-3: Amplitude frequency response of the R&S RT-ZHD (Attenuation 'High') Figure 4-4: Amplitude frequency response of the R&S RT-ZHD (Attenuation 'Low') The bandwidth: ● Specifies the maximum frequency at which a purely sinusoidal signal is still transferred at 70 % (–3 dB) of its amplitude, see Figure 4-3. User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD Step Response ● Specifies the transferable spectrum for other waveforms. E.g., with square wave signals, the fifth harmonic should still be within the bandwidth for a high signal integrity. ● Determines the minimum measurable signal rise time. The rise time trise of the probe is inversely proportional to its bandwidth. The following approximation applies: 4.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD Step Response Figure 4-6: Step response of the R&S RT-ZHD (Attenuation 'Low') The behavior of all R&S RT-ZHD is similar for more than 30 ns after a step. The curves in Figure 4-7 and Figure 4-8 show the step response of the R&S RT-ZHD16 probe, as a typical example. Figure 4-7: Typical step response e.g. of the R&S RT-ZHD16 (Attenuation 'High') User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD CMRR Figure 4-8: Typical step response e.g. of the R&S RT-ZHD16 (Attenuation 'Low') 4.4 CMRR The CMRR is good for low-frequency signals, but it continuously decreases for higher frequencies. Therefore, the CMRR is usually specified as a function of frequency. The figure below shows a typical CMRR with a symmetrical connection for an R&S RTZHD differential probe. An asymmetrical connection to the test point can decrease the CMRR.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD CMRR Figure 4-9: Typical CMRR of the R&S RT-ZHD probe as a function of frequency (Attenuation 'High') Figure 4-10: Typical CMRR of the R&S RT-ZHD probe as a function of frequency (Attenuation 'Low') User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Typical Characteristics of the R&S RT-ZHD Signal Loading of the Input Signal 4.5 Signal Loading of the Input Signal The previous section explained the transfer function and step response of the probe. This section describes how the probe influences the input signal. The input signal loading caused by the probe is determined by its input impedance.
R&S®RT-ZHD07/15/16/60 Maintenance and Service Cleaning 5 Maintenance and Service 5.1 Service Strategy Like all Rohde & Schwarz devices, Rohde & Schwarz probes are of high quality and require only minimum service and repair. However, if the probe needs to be serviced, contact your Rohde & Schwarz service center. Return a defective probe to the Rohde & Schwarz service center for diagnosis and exchange. You can return the R&S RT-ZHD high voltage differential probe for calibration.
R&S®RT-ZHD07/15/16/60 Maintenance and Service Discarding the Probe To clean the exterior of the probe, use a soft cloth moistened with either distilled water or isopropyl alcohol. Before using the probe again, make sure to dry it completely. 5.4 Calibration Interval The recommended calibration interval for R&S RT-ZHD high voltage differential probe is two years. For servicing, send the probe to your nearest Rohde & Schwarz service center (see Chapter 5.2, "Returning the Probe for Servicing", on page 41).
R&S®RT-ZHD07/15/16/60 Dimensions of the Probe 6 Dimensions of the Probe With the accessory for specified operation conditions, the R&S RT-ZHD has the following dimensions: Figure 6-1: Dimensions of the R&S RT-ZHD probe with accessories User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Functional Check 7 Functional Check The functional check is used to confirm the basic operation of the R&S RT-ZHD high voltage differential probe using simple measurement equipment. The functional check is not suitable for verifying compliance with the probe specifications, since the test results are influenced by the oscilloscope used. User Manual 1800.2588.
R&S®RT-ZHD07/15/16/60 Functional Check 1. Connect the R&S RT-ZHD probe to an R&S oscilloscope as described in Chapter 2, "Putting into Operation", on page 20. 2. Connect the safety alligator clip to the square wave output of the oscilloscope. 3. Connect the other safety alligator clip to the probe ground connector oscilloscope. of the 4. Press the PRESET and then the AUTOSET key on the oscilloscope. 5. Set the attenuation ratio on the probe to "Attenuation high" (e.g. 1500 V range).
