N2772A Differential Voltage Probe
Contents
1. a E a Agilent Technologies User s Guide Publication number N2772 92002 September 2002 12773805 For Safety Regulatory and publishing information see the pages at the back of this book O Copyright Agilent Technologies 1999 2002 All Rights Reserved N2772A Differential Voltage Probe Contents Inspect the Probe 3 Compatibility 4 Probe Parts Supplied 5 Characteristics and Specifications 6 Electrical Characteristics 6 Input Characteristics 7 Output Characteristics 7 Environmental Specifications 7 Safety Specifications 8 Using the N2772A Probe 10 Powering the N2772A 10 External Power Supply 10 Install or Replace the Battery 11 Oscilloscope Input Characteristic 11 Select the Correct Attenuation 12 Measurement Tips 12 Calibration Testing Procedures 14 Cleaning the Probe 18 N2772A Differential Voltage Probe Inspect the Probe Inspect the Probe Inspect the shipping container for damage Keep a damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the probe has been checked mechanically and electrically Check the accessories Any accessories that were supplied with the probe are listed in Probe Parts Supplied this manual e Ifthe contents are incomplete or damaged notify your Agilent Technologies Sales Office Inspect the instrument e If there is mechanical damage or defect or if the probe does not operate2. e Service instructions are for trained service personnel To avoid dangerous electric shock do not perform any ser vice unless qualified to do so Do not attempt internal ser vice or adjustment unless another person capable of rendering first aid and resus citation is present e Do not install substitute parts or perform any unauthorized modification to the instrument Capacitors inside the instru ment may retain a charge even if the instrument is dis connected from its source of supply e Do not operate the instru ment in the presence of flam mable gasses or fumes Operation of any electrical instrument in such an environ ment constitutes a definite safety hazard e Do not use the instrument in a manner not specified by the manufacturer To clean the instrument If the instrument requires cleaning 1 Remove power from the instrument 2 Clean the external surfaces of the instrument with a soft cloth dampened with a mixture of mild detergent and water 3 Make sure that the instru ment is completely dry before reconnecting itto a power source Safety Symbols A Instruction manual symbol the product is marked with this symbol when it is neces sary for you to refer to the instruction manual in order to protect against damage to the product Hazardous voltage symbol Earth terminal symbol Used to indicate a circuit common connected to grounded chas sis Agilent Technol
3. properly or pass calibration tests notify your Agilent Technologies Sales Office e Ifthe shipping container is damaged or the cushioning materials show signs of stress notify the carrier as well as your Agilent Technologies Sales Office Keep the shipping materials for the carrier s inspection The Agilent Technologies office will arrange for repair or replacement at Agilent Technologies option without waiting for claim settlement N2772A Differential Voltage Probe Inspect the Probe N2772A Differential Voltage Probes The N2772A differential probe allows you to safely measure floating circuits as high as 600V dc peak to ground with the oscilloscope grounded It is ideal for many applications such as motor speed controls power supply designs and electronic high power converters With 20 MHz bandwidth switchable attenuation of 20 1 and 200 1 and a maximum voltage input of 600V it provides the versatility for a broad range of applications including high voltage circuits Each probe comes with sharp probe tips for use on small components and in tight places and alligator clips for connecting to larger cables The probe is powered by a 9V battery or by using a separate power supply the N2773A Compatibility The N2772A differential probe is compatible with any oscilloscope that has the following features e 1 MQ input impedance e Can display 30V peak input e Has BNC input Probe Parts Supplied N2772A Differenti
4. V 200X 4 88 V 5 12 V Test Common Mode Rejection Ratio CMRR Connect adaptation 1 to the 33250B function generator output Connect the 33250B function generator TTL output to CH4 of the 54622A oscilloscope for triggering Connect the red and black N2772A probe tips to the red banana outputs of adaptation 1 Connect the N2772A output to CH1 of the 54622A oscilloscope Load the appropriate setup file Verify the value complies with the 3458A limits listed in the table below for each output signal at each probe setting Record the value displayed on the 3458A in the Calibration Test Record Test 33250B Output Signal N2772A Setting 54622A setup amp limits CMRR Sine wave 60 Hz 20 Vop 20X Recall setup 1 lt 1 4 div CMRR Sine wave 60 Hz 20 Vop 200X Recall setup 2 lt 1 div CMRR Sine wave 1 MHz 20 Vop 20X Recall setup 3 lt 1 div CMRR Sine wave 1 MHz 20 Vpp 200X Recall setup 4 lt 1 div 17 SD NA ON Na ok OD N2772A Differential Voltage Probe Cleaning the Probe Test Bandwidth with power supply Connect adaptation 2 to the 33250B function generator output Connect the red N2772A probe tip to the red banana jack Connect the black N2772A probe tip to the black banana jack Connect the N2772A output to CH1 of the 54622A oscilloscope Load the appropriate setup file Verify the value complies with the 3458A limits listed in the table below for each output signal at each probe setting Record the value d
5. Year Recommended Date of Next Certification Certification Temperature Serial No N2772A 20 MHz Differential Probe Certification Date Tested By Test Probe Settings Limits Results Offset 20X 10 mV 10 mV Reading on the 3458A Offset 200X 10 mV 10 mV Reading on the 3458A Gain 20X 488 mV 512 mV Reading on the 3458A Gain 20X 4 88 V 5 12 V Reading on the 3458A Gain 200X 488 mV 512 mV Reading on the 3458A Gain 200X 4 88 V 5 12 V Reading on the 3458A Gain 20X 488 mV 512 mV Reading on the 3458A Gain 20X 4 88 V 5 12 V Reading on the 3458A Gain 200X 488 mV 512 mV Reading on the 3458A Gain 200X 4 88 V 5 12 V Reading on the 3458A CMRR 20X lt 1 4 div Reading on oscilloscope CMRR 200X lt 1 div Reading on oscilloscope CMRR 20X lt 1 div Reading on oscilloscope CMRR 200X lt 1 div Reading on oscilloscope Bandwidth 20X gt 3 5 div Reading on oscilloscope with power supply Bandwidth 200X gt 3 5 div Reading on oscilloscope with power supply Bandwidth 20X gt 3 5 div Reading on oscilloscope with battery power Bandwidth 200X gt 3 5 div Reading on oscilloscope with battery power 19 N2772A Differential Voltage Probe Calibration Test Record 20 Safety Notices This apparatus has been designed and tested in accor dance with IEC Publicati
6. 10 1 1992 Supplementary Information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE marking accordingly European Union This product was tested in a typical configuration with Agilent Technologies test systems Date 08 21 2000 L LM Ken Wyatt Product Regulations Manager For further information please contact your local Agilent Technologies sales office agent or distributor Product Regulations Performance Criteria EMC IEC 61326 1 1997 A1 1998 EN 61326 1 1997 A1 1998 CISPR 11 1990 EN 55011 1991 IEC 61000 4 2 1995 A1 1998 EN 61000 4 2 1995 IEC 61000 4 3 1995 EN 61000 4 3 1995 IEC 61000 4 4 1995 EN 61000 4 4 1995 IEC 61000 4 5 1995 EN 61000 4 5 1995 IEC 61000 4 6 1996 EN 61000 4 6 1996 IEC 61000 4 11 1994 EN 61000 4 11 1995 Canada ICES 001 1998 Australia New Zealand AS NZS 2064 1 P gt gt gt u gt Safety IEC 61010 1 1990 A1 1992 A2 1995 EN 61010 1 1993 A2 1995 Canada CSA C22 2 No 1010 1 1992 Additional Information The product herewtih complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly European Union Performance Codes A PASS Normal operation no effect B PASS Temporary degradation self recoverable C PASS Temporary degradation operator interven
7. 27 14 June 1987 or DFAR 252 227 7015 b 2 November 1995 as applicable in any technical ata Document Warranty The material contained in this document is provided as is and is subject to being changed without notice in future editions Further to the maximum extent permitted by appli cable law Agilent dis claims all warranties either express or implied with regard to this man ual and any information contained herein includ ing but not limited to the implied warranties of merchantability and fit ness for a particular pur pose Agilent shall not be liable for errors or for incidental or consequen tial damages in connec tion with the furnishing use or performance of this document or of any information contained herein Should Agilent and the user have a sepa rate written agreement with warranty terms cov ering the material in this document that conflict with these terms the war ranty terms in the sepa rate agreement shall control Technology Licenses The hardware and or soft ware described in this docu ment are furnished under a license and may be used or copied only in accordance with the terms of such license WARNING A WARNING notice denotes a hazard It Calls attention to an operating procedure practice or the like that if not correctly performed or adhered to could result in personal injury or death Do not proceed beyond a WARNING notice until the indicated cond
8. Hz 200X Setting on Probe CH1 ON CH1 Sensitivity 10 mV div AC CH2 OFF CH2 Sensitivity 2 V div DC Timebase 20 ns div BWL Bandwidth Limiter OFF Trigger on CH2 Test Offset Power the N2772A with the N2773A power supply Connect the N2772A output to the 3458A multimeter via the BNC f to banana m adapter Verify the value is between the 3458A limits listed in the table below for each probe setting Record the value displayed on the 3458A in the Calibration Test Record Test Test Signal N2772A Setting 3458A Reading Limits Offset None 20X 10 mV 10 mV Offset None 200X 10 mV 10 mV 16 N N2772A Differential Voltage Probe Calibration Testing Procedures Test Gain Connect the red end of the N2772A probe to the calibrator HI output Connect the black end of the N2772A probe to the calibrator LO output Connect the N2772A probe output to the 3458A multimeter via the BNC to banana m adapter Verify the value is between the 3458A limits listed in the table below for each output signal at each probe setting Record the value displayed on the 3458A in the Calibration Test Record Test Calibrator Output Signal DC N2772A Setting 3458A Reading Limits Gain 10 V 20X 488 mV 512 mV Gain 100 V 20X 4 88 V 5 12 V Gain 100 V 200X 488 mV 512 mV Gain 1000 V 200X 4 88 mV 5 12 V Gain 10V 20X 488 mV 512 mV Gain 100 V 20X 4 88 mV 5 12 V Gain 100 V 200X 488 mV 512 mV Gain 1000
9. akaline battery Delivered with probe N2772A Differential Voltage Probe Characteristics and Specifications For derating of each input probe red or black see the figure below 70 Urms 700 EHHH 0 01 0 02 0 05 0 02 05 I z 5 mo 20 50 10 er MHz Input Characteristics Input probe tip style Probe cable length Shrouded banana probe tip 1 5 meter 60 inches Maximum input voltage to ground600V CAT III Maximum differential input voltage 1000V CAT II 1000 VDC or 1000 Vrms or 1200V DC AC peak Output Characteristics Output Characteristics Output cable Cable length Maximum output voltage range Safety designed BNC cable 0 5 meter 20 inches 6 5 V into 1 MQ Environmental Specifications Temperature Altitude Operating 0 C to 50 C 32 F to 122 F Storage 10 C to 60 C 14 F to 140 F Operating 3 km 9850 feet Storage 12km 40 000 feet N2772A Differential Voltage Probe Characteristics and Specifications Table 1 Susceptibility in of full dynamic range Frequency range E 3V m E 10V m 10 kHz to 25 MHz 20x lt 1 lt 1 200x lt 1 lt 1 Frequency range E 3V m E 10V m 25 MHz to 1 GHz 20x lt 1 lt 2 200x lt 1 lt 2 Safety Specifications Meets requirements of EN61010 2 31 1EC1010 2 31 Compliant with UL3111 1 including listing CSA C222 2 No 1010 1 92 approval pending Max floating outp
10. al Voltage Probe Inspect the Probe The following diagram and table show the parts supplied with the N2772A Probe A Parts for N2772A Probe Item Description Part Number 1 Differential voltage probe N2772 60001 2 Probe tips 5063 2188 3 Banana jack alligator black 5063 2189 4 Banana jack alligator red 5063 2187 5 Hook Retractable black 5063 2191 6 Hook Retractable red 5063 2190 N2772A Differential Voltage Probe Characteristics and Specifications Characteristics and Specifications Characteristics and specifications for the N2772A Differential Voltage Probe are shown below Electrical Characteristics Attenuation ratios Bandwidth into 1 MQ 50 pF Accuracy Rise Time High CMRR Input impedence Output impedence Noise Offset Switch positions External power Internal power Power indicators Auto stand by 20 1 and 200 1 Selectable via switch on probe 20 MHz 2 5 into 1 MQ 200x 17 5 ns 20x 17 5 ns 80 dB 60Hz 50 dB 1 MHz Between inputs 10 MQ 5 pF 50Q 200x lt 2 mVrms 20x lt 3 mVrms lt 10 mV into 1 MQ OFF 200x 20x Via power adapter N2773A optional Battery power Alkaline 9V IEC6LR61 Battery life 8 hour operation 400 hour in auto standby Green LED ON at normal operation Blinks at standby Red LED ON when battery needs to be replaced After 30 minutes only when battery operated Battery life measured 25 C with Duracell
11. e Using the N2772A Probe Powering the N2772A The N2772 probe can be powered either by an internal 9V battery or the N2773A power supply The battery has a limited life For this reason the probe has a LOW BATTERY indicator and will automatically switch to STAND BY mode after approximately 30 minutes If you store the probe for extended periods of time remove the battery and store it separately External Power Supply For convenience the N2773A power supply is recommended When you use this power supply take care to select the appropriate voltage with the switch on the rear ofthe probe power supply The power source has been designed to provide the correct power with 50 Hz 60 Hz and 400 Hz sources of 115V and 230V 10 N2772A Differential Voltage Probe Using the N2772A Probe Install or Replace the Battery WARNING Never install or replace the battery while the probe is connected to a voltage source Replace the battery when the red LED is lit or when both red and green A LED s are off when the probe is switched on The expected battery life is 8 hours of operation and 400 hours in auto standby Oscilloscope Input Characteristic The probe has been designed to drive a 1MQ input to maximize battery life The input capacitance of the oscilloscope should be lt 50 pF 11 N2772A Differential Voltage Probe Using the N2772A Probe Select the Correct Attenuation on the Probe and the Oscilloscope The probe has two mod
12. es of operation 20 1 and 200 1 attenuation Select the desired attenuation on the probe and the correct probe attenuation setting on the oscilloscope This will ensure that accurate voltage readings can be made directly from the oscilloscope Measurement Tips Use the 20x range on the differential voltage probe for smaller signals such as ripple on a high voltage reference lead When the probe is battery operated the red LED indicates that the battery level is low and the battery needs to be replaced When battery operated the probe automatically goes to standby mode after 30 minutes to conserve battery power A blinking green LED indicates that the probe is in standby mode To continue operation turn the range selection switch from OFF to 20x or 200x Connect the red probe cable to amore positive or more negative voltage level than the black probe cable 12 N2772A Differential Voltage Probe Service Strategy Service Strategy For repair calibration and to ensure the N2772A performs to its warranted specifications send the probe to an Agilent Service Center for calibration testing procedures The probe should be tested once a year or as required by other standards If repair is needed and the N2772A is under warranty normal warranty services will apply If the N2772A is not under warranty repair costs will be applied To return the Probe to Agilent Technologies for Service Call 877 477 7278 for further details and
13. isplayed on the 3458A in the Calibration Test Record Test 33250B Output Signal N2772A Setting 54622A setup amp limits Bandwidth Sine wave 20 MHz 20 Vop 20X Recall setup 5 gt 3 5 div Bandwidth Sine wave 20 MHz 20 Vop 200X Recall setup 6 gt 3 5 div Test Bandwidth with battery power Connect adaptation 2 to the 33250B function generator output Connect the red N2772A probe tip to the red banana jack Connect the black N2772A probe tip to the black banana jack Connect the N2772A output to CH1 of the 54622A oscilloscope Disconnect the N2773 power supply and use battery power Load the appropriate setup file Verify the value complies with the 3458A limits listed in the table below for each output signal at each probe setting Record the value displayed on the 3458A in the Calibration Test Record Test 33250B Output Signal N2772A Setting 54622A setup amp limits Bandwidth Sine wave 20 MHz 20 Vop 20X Recall setup 5 gt 3 5 div Bandwidth Sine wave 20 MHz 20 Vop 200X Recall setup 6 gt 3 5 div Cleaning the Probe Disconnect the probe from all power sources and clean it with a soft cloth dampened with a mild soap and water solution Be careful not to get water in the attenuation switch Make sure the probe is completely dry before reconnecting it to a power source 18 N2772A Differential Voltage Probe Calibration Test Record Calibration Test Record Agilent Technologies Recommended Test Interval 1
14. itions are fully understood and met CAUTION A CAUTION notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly performed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met DECLARATION OF CONFORMITY According to ISO IEC Guide 22 and CEN CENELEC EN 45014 Manufacturer s Name Agilent Technologies Inc Manufacturer s Address 1900 Garden ofthe Gods Road Colorado Springs CO 80907 U S A Declares that the product Product Name Differential Voltage Probe Model Number s N2772A Product Option s This declaration covers all options of the above product s Conforms with the following product standards EMC Standard Limit IEC 61326 1 1997 A1 1998 EN 61326 1 1997 A1 1998 CISPR 11 1990 EN 55011 1991 Group 1 Class A 1 IEC 61000 4 2 1995 A1 1998 EN 61000 4 2 1995 4kV CD 8kV AD IEC 61000 4 3 1995 EN 61000 4 3 1995 3 V m 80 1000 MHz IEC 61000 4 4 1995 EN 61000 4 4 1995 0 5kV signal lines 1kV power lines IEC 61000 4 5 1995 EN 61000 4 5 1995 0 5 kV line line 1 kV ground line IEC 61000 4 6 1996 EN 61000 4 6 1996 1 cycle 100 IEC 61000 4 11 1994 EN 61000 4 11 1995 3V 0 15 80 MHz Canada ICES 001 1998 Australia New Zealand AS NZS 2064 1 Safety IEC 61010 1 1990 A1 1992 A2 1995 EN 61010 1 1993 A2 1995 Canada CSA C22 2 No 10
15. ogies P O Box 2197 1900 Garden of the Gods Road Colorado Springs CO 80901 Notices Agilent Technologies Inc No part ofthis manual may be reproduced in any form or by any means including elec tronic storage and retrieval or translation into a foreign lan guage without prior agree ment and written consent from Agilent Technologies Inc as governed by United States and international copy right laws Manual Part Number N2772 92001 September 2002 Print History N2772 92000 November 1999 N2772 92001 September 2002 Agilent Technologies Inc 1900 Garden ofthe Gods Road Colorado Springs CO 80907 USA Restricted Rights Legend If software is for use in the performance of a U S Govern ment prime contract or sub contract Software is delivered and licensed as Commercial computer soft ware as defined in DFAR 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a or as Restricted computer soft ware as defined in FAR 52 227 19 June 1987 or any equivalent agency regulation or contract clause Use dupli cation or disclosure of Soft ware is subject to Agilent Technologies standard com mercial license terms and non DOD Departments and Agencies of the U S Govern ment will receive no greater than Restricted Rights as defined in FAR 52 227 19 c 1 2 June 1987 U S Govern ment users will receive no greater than Limited Rights as defined in FAR 52 2
16. on 1010 Safety Requirements for Measuring Apparatus and has been supplied in a safe condition This is a Safety Class instrument provided with terminal for protective earthing Before applying power verify thatthe correct safety precautions are taken see the following warnings In addition note the external markings on the instrument that are described under Safety Symbols Warnings e Before turning on the instru ment you must connect the protective earth terminal of the instrument to the protec tive conductor of the mains power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact You must not negate the protec tive action by using an exten sion cord power cable without a protective conduc tor grounding Grounding one conductor of a two con ductor outlet is not sufficient protection Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuse holders To do so could cause a shock or fire hazard e If you energize this instru ment by an auto transformer for voltage reduction or mains isolation the common terminal must be connected to the earth terminal of the power source e Whenever it is likely that the ground protection is impaired you must make the instrument inoperative and secure it against any unintended opera tion
17. the location of your nearest Agilent Technologies Service Office Write the following information on a tag and attach it to the probe e Name and address of the owner e Probe model number e Description of service required or failure indication Retain all accessories Return the probe in its case or pack the probe in foam or other shock absorbing material and place it in a strong shipping container You can use the original shipping materials or order materials from an Agilent Technologies Sales Office If neither are available place 3 to 4 inches of shock absorbing material around the instrument and place it in a box that does not allow movement during shipping Seal the shipment container securely Mark the shipping container as FRAGILE In all correspondence refer to the instrument by model number and full serial number 13 N2772A Differential Voltage Probe Calibration Testing Procedures Calibration Testing Procedures These procedures are used to test the warranted specifications for the N2772A Differential Probe The recommended calibration test interval for the N2772A is once a year or as required Use the equipment listed in the Test Equipment Required section to complete the Calibration Testing Procedures Required Test Equipment Description Minimum Requirements Part Number Multimeter 8 5 digits of resolution 3458A Oscilloscope 100 MHz 54622A Calibrator DC Voltage 0 to 1100 V Fluke 5700A Programmable F
18. tion required D FAIL Not recoverable component damage Notes Sound Pressure Level N A Regulatory Information for Canada ICES NMB 001 This ISM device complies with Canadian ICES 001 Cet appareil ISM est confomre a la norme NMB 001 du Canada Regulatory Information for Australia New Zealand This ISM device complies with Australian New Zealand AS NZS 2064 1 N10149 26 27 E Agilent Technologies Agilent Technologies Printed in the Malaysia Manual Part Number N2772 92002
19. unction 50 MHz sine wave Generator N2772A probe with N2773A power supply Adaptation 1 50 Q T piece BNC 2 50 Q right angle BNC 2 BNC m to banana f Adaptation 2 50 Q termination BNC m to banana f Adapter BNC f to banana m Setup Files for testing Setup for CMRR at 60 Hz at 20X Setting on Probe CH1 ON CH1 Sensitivity 5 mV div AC CH2 OFF CH2 Sensitivity 2 V div DC Timebase 2 ms div BWL Bandwidth Limiter ON Trigger on CH2 14 N2772A Differential Voltage Probe Calibration Testing Procedures Setup for CMRR at 60 Hz at 200X Setting on Probe CH1 CH1 Sensitivity CH2 CH2 Sensitivity Timebase BWL Bandwidth Limiter Trigger on ON 2 mV div AC OFF 2 V div DC 2 ms div ON CH2 Setup for CMRR at 1 MHz at 20X Setting on Probe CH1 CH1 Sensitivity CH2 CH2 Sensitivity Timebase BWL Bandwidth Limiter Trigger on ON 200 mV div AC OFF 2 V div DC 500 ns div ON CH2 Setup for CMRR at 1 MHz at 200X Setting on Probe CH1 CH1 Sensitivity CH2 CH2 Sensitivity Timebase BWL Bandwidth Limiter Trigger on ON 50 mV div AC OFF 2 V div DC 500 ns div ON CH2 15 N2772A Differential Voltage Probe Calibration Testing Procedures Setup for Bandwidth at 20 MHz 20X Setting on Probe CH1 ON CH1 Sensitivity 100 mV div AC CH2 OFF CH2 Sensitivity 2 V div DC Timebase 20 ns div BWL Bandwidth Limiter OFF Trigger on CH2 Setup for Bandwidth at 20 M
20. ut voltage 600V Category III up to 400Hz From shielding to ground WARNING A WARNING N2772A Differential Voltage Probe Characteristics and Specifications SHOCK HAZARD These probes are designed for use with oscilloscopes that have a common terminal at GROUND POTENTIAL in accordance with OSHA requirements and the National Electric Code Exposed metallic surfaces of the probe and the oscilloscope MUST BE GROUNDED Failure to ground the common terminal during certain applications such as those requiring the oscilloscope to be powered from an external battery might expose the operator to an electrical shock hazard that could be lethal depending on voltage and current conditions Do the following to avoid electrical shock or fire if the probe is connected to more than 42V peak 30V rms e Use only the N2773A power adapter or a 9V battery Connect the power adapter to the AC outlet before connecting it to the N2772A e Do not insert metal objects in the power adapter connector e Use 600V rated test lead adapters The maximum allowable input voltage is 600V Category III This symbol signifies that the N2772A Differential Probe is protected by E double or reinforced insulation Only use specified replacement parts when servicing the instrument This symbol signifies CAUTION and requests that the user refer to the MA user manual before using the instrument N2772A Differential Voltage Probe Using the N2772A Prob
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