Teledyne Lecroy HVFO108, Operator'S Manual

Page 1: ...Operator s Manual HVFO108 High Voltage Fiber Optically Isolated Probe ...

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Page 3: ...HVFO108 High Voltage Fiber Optically Isolated Probe Operator s Manual June 2020 ...

Page 4: ...raining purposes Information contained herein is classified as EAR99 under the U S Export Administration Regulations Export reexport or diversion contrary to U S law is prohibited Teledyne LeCroy is a trademark of Teledyne LeCroy Inc Other product or brand names are trademarks or requested trademarks of their respective holders Information in this publication supersedes all earlier versions Specif...

Page 5: ...are Versions 9 HVFO Probe System 10 HVFO108 Probe 10 Attenuating Tips one required 11 Optional Accessories 11 HVFO108 Probe Specifications 12 Performance 12 Electrical Characteristics 12 Vertical Sensitivity 13 Amplifier Modulating Transmitter Battery 13 Dimensions 13 Bandwidth 14 Common Mode Rejection Ratio 15 Input Impedance 16 Operation 17 Assembling the Probe 17 Connecting to the Test Circuit ...

Page 6: ...y 26 HVFO108 Performance Verification Test Record 27 Care and Maintenance 28 Cleaning the Probe Body 28 Cleaning the Optical Ports 28 Cleaning the Fiber Optic Cable 28 Replacing the Transmitter Battery 28 Calibration Interval 28 Service Strategy 28 Attenuating Tip Compensation 29 Returning a Product for Service 30 Technical Support 31 Reference 32 Common Mode Rejection Ratio 32 Common Mode Range 3...

Page 7: ...autions To avoid personal injury or damage to your equipment Use only as specified The probe is intended to be used only with compatible Teledyne LeCroy instruments Using the probe and or the equipment it is connected to in a manner other than specified may impair the protection mechanisms Do not overload observe all ratings Do not connect the probe to any circuit that exceeds the ratings of the o...

Page 8: ... DC bus voltages are 60 V The probe is not rated for hand held use above 60 V If there is any question as to whether 60 V voltages are present in the circuit use caution and DO NOT touch these components Always ensure that when not hand held the amplifier modulating transmitter and attached tip are positioned to maintain adequate spacing between these two components and earth ground Some of the pr...

Page 9: ...uating Tip HVFO100 5X TIP U No Rated Measurement Category 5 V DC Peak AC 25 V maximum non destruct 10x Attenuating Tip HVFO100 10X TIP U No Rated Measurement Category 10 V DC Peak AC 50 V maximum non destruct 20x Attenuating Tip HVFO100 20X TIP U No Rated Measurement Category 20 V DC Peak AC 100 V maximum non destruct 40x Attenuating Tip HVFO100 40X TIP U No Rated Measurement Category 40 V DC Peak...

Page 10: ...ensing 80 RH above 30 C 45 RH above 50 C Altitude Operating 3000 m 9842 ft maximum Altitude Non Operating 10 000 m 32 807 ft maximum Usage Indoor Use Only Pollution Degree 2 an operating environment where normally only dry non conductive pollution occurs Conductivity caused by temporary condensation should be expected Per IEC EN 61010 031 2015 The SAC 01 case and packaging materials shipped with t...

Page 11: ...4 guaranteed ProBus interface with automatic scaling Auto Zero capabilities Method of Operation The low attenuation tip makes a three wire Signal Reference and Shield electrical connection to the device under test DUT The Signal connection wire is coaxial and attaches to the high side of the signal measurement The Reference wire and Shield wires are non coaxial and attach to the low side of the si...

Page 12: ...nd the difference between them is VS The high VCM value typically 500 to 1000 VDC results in large current flows based on the proportion of RLEAD to RSENSE when RLEAD is not RSENSE These large current flows may load the circuit and inhibit proper DUT operation The input lead capacitance CLEAD has a very high voltage either VCM or VCM VS which will result in a large capacitive charging current that...

Page 13: ...quirement to identically match a differential lead pair and the high CMRR performance is inherent in the fiber optic isolation from ground In the example above the HVFO will perform better than a conventional high attenuation HV differential probe when some or all of the following are true Common mode voltages VCM are higher 170VDC or more DUT impedance is lower Signal rise times are faster within...

Page 14: ... tip at the internal shield of the transmitter The current flowing through the Shield wire will drive the reference voltage for the single ended amplifier including the effects of any parasitic capacitance The HVFO108 by design is not a differential probe so the Signal and Reference wires are imbalanced in impedance By using separate Reference signal return and Shield wires to carry currents the p...

Page 15: ...common mode capacitance Compatibility The HVFO108 probe is compatible with a wide range of Teledyne LeCroy oscilloscopes equipped with the ProBus interface Visit teledynelecroy com oscilloscope to confirm compatibility with your oscilloscope model In general Teledyne LeCroy 12 bit High Definition Oscilloscopes HDO provide the most offset capability over the widest range of V div settings Note HVFO...

Page 16: ... properly the probe will provide a warning to the user A 1 meter cable is supplied additional 1 or 6 meter cables are available as optional accessories The cable utilizes an Avago VersaLink connector enabling it to be interchanged with low cost off the shelf fiber optic cables Cables longer than 6 meters may be sourced directly from the manufacturer Industrial Fiber Optics http www i fiberoptics c...

Page 17: ... end of the tip connects to the USB Micro B input on the transmitter Each tip communicates identifying information to the transmitter The fixed attenuation determines the maximum voltage level that can be measured All tips are interchangeable with any HVFO transmitter and do not require specialized calibration with a specific HVFO probe The E Z Micro Grippers may be used with any of the tips Note ...

Page 18: ... MHz 35 dB 150 MHz Electrical Characteristics Input Dynamic Voltage Range 1x tip 5x tip 10x tip 20x tip 40x tip 1 V 5 V 10 V 20 V 40 V Max Common Mode Voltage from either input to ground 35 kV DC peak AC Max Input Voltage to Earth from either input to ground 35 kV DC peak AC Max Safe Input Voltage 30 VRMS 60 VDC hand held Max Non destruct Voltage Lower of 5X dynamic range or 100 V Noise probe only...

Page 19: ... 6 hours Recharge Time Oscilloscope USB port USB charger 5 hours 2 5 hours Cycle Life 500 cycles For battery life 5 5 hours Dimensions Amplifier Modulating Transmitter Width 48 mm 1 89 in Length Body only With leads attached 90 2 mm 3 55 in 245 mm 9 65 in Height Without feet With feet 25 mm 0 98 in 27 5 mm 1 08 in Attenuating Tips Insulated Socket Diameter 3 mm 0 12 in Length Green REF Wire 8 cm 3...

Page 20: ...0x and 40x tips averaged Typical bandwidth of the HVFO108 using the 1x attenuating tip 4 3 5 3 2 5 2 1 5 1 0 5 0 0 5 1 5 15 25 35 45 55 65 75 85 95 105 115 125 135 145 155 165 175 185 195 Response dB Frequency MHz Frequency Response typical 4 3 5 3 2 5 2 1 5 1 0 5 0 0 5 1 5 15 25 35 45 55 65 75 85 95 105 115 125 135 145 Response dB Frequency MHz 1x Frequency Response typical ...

Page 21: ...tage generator The HF Sweep was measured with an external generator All discontinuities are due to a combination of noise floor limitations of the measurement device and amplification capabilities of the generators CMRR for the 5x 20x and 40x tips can be expected to scale proportional to the tip attenuation ratios For instance for a 5x tip the CMRR will be 20log10 5 1 14dB less than shown above i ...

Page 22: ...6 EAR99 technology subject to restrictions on copyrights page Input Impedance Typical input impedance for the tips is described in the plot below Input impedance for the 40X tip is the same as for the 20X tip Input impedance for the 10X tip is 8 MΩ 23 pF ...

Page 23: ...ptic cable to the demodulating receiver This requires a small amount of force You will hear a click when it is inserted 3 Connect the other end of the fiber optic cable to the transmitter CAUTION The minimum bend radius of the fiber optic cable is 65 mm 4 Connect the tip to the USB Micro B interface on the transmitter CAUTION As soon as the tip is connected it will turn on the transmitter and begi...

Page 24: ... measure the signal VS but not so much dynamic range that the measurement is noisier than desired 2 Connect the green Reference and black Shield leads to the floating board reference VCM The example below left shows the tip lead sockets connected to a short stub on the circuit board 22AWG wires or 0 100 pitch pin headers work well with the tip socket Alternately the micro grippers may also be used...

Page 25: ...e black Shield wires to reduce loop inductance and to achieve optimum CMRR performance For best CMRR performance directly connect the tip socket to a short stub or wire connected to the circuit Only use a micro gripper if absolutely necessary or if you can demonstrate that it performs acceptably well If parasitic common mode capacitance is expected to be high use a non conductive platform not supp...

Page 26: ...When a probe with tip is first connected to the oscilloscope you will see a sine wave oscillate up to 40 khz on top of any actual signal for 7 seconds whether or not the probe is connected to a DUT This is an artifact of the phase lock loop locking the amplifier receiver to the transmitter If connected to a DUT the DUT is safe and will not see this signal Operating with an Oscilloscope When the en...

Page 27: ...scope front end V div Vertical Scale setting with the probe connected This may be calculated as Oscilloscope Front End V Div Probe and Oscilloscope V Div Total Probe Attenuation Once the oscilloscope V div value is known you can find the maximum offset available at that V div setting either by consulting the oscilloscope specifications or by selecting to Use Max Offset with the oscilloscope set to...

Page 28: ...USB Micro B charging cable supplied to connect the transmitter to a USB port on the oscilloscope or another computer Use a USB charger not supplied and connect to power Ambient temperature during charging should be between 0 and 40 C which is lower than the operating range of the probe CAUTION If you plug into the USB port of a powered down computer or oscilloscope the battery will not charge it w...

Page 29: ...truments used in his procedure Required Test Equipment The following equipment or its equivalent is required for performance verification of the HVFO108 probe As input output connector types vary on different brands of instruments additional adapters or cables may be required Description Minimum Requirements Example Equipment Oscilloscope ProBus interface equipped 12 bit resolution Teledyne LeCroy...

Page 30: ...ing AutoZero on HVFO108 is displayed in the message bar and that no error messages are displayed Before You Begin 1 With the demodulating receiver connected to C1 allow at least 30 minutes warm up 2 Turn on the other test equipment and allow these to warm up for the time recommended by the manufacturer 3 Connect the transmitter to the demodulating receiver Connect the HVFO100 1X TIP U to the input...

Page 31: ...re wave of 100 Hz amplitude of 1 0 VPK PK 4 Set the oscilloscope Timebase to 10 mS div and C1 Vertical Scale to 200 mV div 5 Turn on measurements Set oscilloscope P1 to measure the amplitude ampl of C1 6 Adjust the generator output voltage so that the voltage measured on the DMM is as close to 500 mVRMS as possible this should be 500 1 mVRMS 7 Record the ampl C1 measurement on the test record 8 Ca...

Page 32: ...pen the transmitter by removing the sticky rubber feet and screws that hold together the housing top and bottom 2 On the oscilloscope set the math trace F1 to be the Trend of measurement P1 amplitude of C1 This will enable you to see small variations in the amplitude so that the adjustments can be more precise 3 Carefully adjust the capacitor C36 so that the ampl of C1 is maximized 4 Carefully adj...

Page 33: ...ction Generator N A The function generator is used for making relative measurements The output of the generator is measured with a DMM or oscilloscope Thus the generator is not required to be calibrated Gain Accuracy Step Description Intermediate Data Test Result 7 HVFO108 Measured Voltage VPK PK 8 Gain Error 4 Permission is granted to photocopy this page to record the results of the Performance V...

Page 34: ...eplacing the Transmitter Battery The transmitter battery is not field replaceable Return the probe to Teledyne LeCroy service if the battery malfunctions See Appendix A Battery Safety and Handling for indicators of failure Calibration Interval The recommended calibration interval is one year A performance verification procedure is included in this manual The complete performance verification shoul...

Page 35: ...ated Follow these steps to compensate 5X 10X 20X and 40X attenuating tips 1X attenuating tips do not need compensation 1 Connect the tip to a 1 kHz square wave signal 5X attenuating tips may be connected to the Cal Out hook on the oscilloscope 10X 20X and 40X attenuating tips should be connected to a function generator with a good square wave 2 Adjust the trimmer located on the back of the Micro B...

Page 36: ...r equivalent Do not include the manual 3 Label the case with a tag containing The RMA Name and address of the owner Product model and serial number Description of failure or requisite service 4 Pack the product case in a cardboard shipping box with adequate padding to avoid damage in transit 5 Mark the outside of the box with the shipping address given to you by Teledyne LeCroy be sure to add the ...

Page 37: ... Library on its website Manuals tutorials application notes white papers and videos are available to help you get the most out of your Teledyne LeCroy products Visit teledynelecroy com support techlib Service Centers For a complete list of offices by country including our sales and distribution partners visit teledynelecroy com support contact Teledyne LeCroy 700 Chestnut Ridge Road Chestnut Ridge...

Page 38: ...on As the frequency of the common mode component increases the effects of stray parasitic capacitance and inductance in determining the AC component become more pronounced In a conventional high attenuation HV differential probe used to measure a small signal floating on a high common mode voltage the differential mode gain must be very high and the input path matching must be very precise limitin...

Page 39: ...ky for obvious reasons and impractical to use on dense compact power electronics circuits More recently safety standards have recognized this reality and created new measurement categories for probes used in test and measurement applications and not connected to the mains However probes like the HVFO defy measurement categorization The HVFO uses a fiber optic cable to optically isolate the amplifi...

Page 40: ...pair or at our option replace any product returned to one of our authorized service centers within this period However in order to do this we must first examine the product and find that it is defective due to workmanship or materials and not due to misuse neglect accident or abnormal conditions or operation Teledyne LeCroy shall not be responsible for any defect damage or failure caused by any of...

Page 41: ...missions Group 1 Class A 2 3 Electromagnetic Immunity IEC EN 61000 4 2 2009 Electrostatic Discharge 4 kV contact 8 kV air 4 kV vertical horizontal coupling planes 4 IEC EN 61000 4 3 A2 2010 RF Radiated Electromagnetic Field 3 V m 80 1000 MHz 3 V m 1400 MHz 2 GHz 1 V m 2 GHz 2 7 GHz 1 To ensure compliance with the applicable EMC standards use high quality shielded interface cables 2 This product is...

Page 42: ...mpliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities IEC EN 61010 031 2015 Safety requirements for electrical equipment for measurement control and laboratory use Part 031 Safety requirements for handheld probe assemblies for electrical measurement and test Environmental Compliance END OF LIFE HANDLING The probe is marked with this...

Page 43: ...s more than 130 C Doing so can melt the battery insulator damage the safety function or ignite electrolytes If the polymer separator is melted an internal short circuit can occur in individual cells 3 Do not place the probe in a microwave or a high pressure container Heat can damage the battery s protective mechanisms 4 Do not use the probe near fire or other heat sources If liquid leaks from the ...

Page 44: ...ailed or disassembled may cause it to be overcharged or an abnormal chemical reaction to occur in the cells 10 Do not charge the amplifier battery from a wall socket or car cigarette charger Excessive voltage can damage the battery s protective mechanisms CAUTION 1 Read the manual before using the probe Keep the manual handy where using the probe 2 Read the charging instructions before charging th...

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Page 48: ...932301 00 Rev A June 2020 ...