Current Probe Manual HHM71 and HHM74
Contents
1. 2 a EGET TS1 a 2 ale elle TT 3 Desc a bia ei ini adire iaia 3 Specificationsi etti iaia ies ate cee ae eed 4 DMM Display Compatibility iii 10 Operating Procedure enire minn a a 11 Making Measurements with the Models HHM71 and HHM7A4 11 DE Measurement sprn otte pila la lisa 11 AG Measurement cir aaa 12 INdicator LIG htsi slancio elia aoe arin da 12 Operation Examples i 13 Tips for Getting the Best ACCUFAaCYy i 16 Typical Response Curves i 17 Maintenance giacevano ali rea 18 Walling asolo rale 18 Battery Replacement ii 18 CAE AMINO coo ratita eee elit enced eit DA estan 18 Warning These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument e Read the instruction manual completely and follow all the safety information before attempting to use or service this instrument Use caution on any circuit Potentially high voltages and currents may be present and may pose a shock hazard Read the Safety Specifications section prior to using the current probe Never exceed the maximum voltage ratings given Safety is the responsibility of the operator NEVER open the back of the instrument while connected to any circuit or input ALWAYS connect the current probe to the display device before clamping the probe onto the sample being tested ALWAYS inspect the i2. Phase Shift 45 to 65 Hz 10 to 200 A lt 2 5 200 to 400 A lt 2 Overload 2000 A DC and 1000 A AC continuous up to 1 kHz MECHANICAL Jaw Opening 1 2 31 mm Maximum Cable Diameter One 1 18 30 mm or two 0 95 24 mm or two bus bars 1 2 x 0 4 31 5 x 10 mm Dimensions without zero knob 8 8 x 3 82 x 1 73 224 x 97 x 44 mm Weight 15 oz 440 g HHM74 Specifications ELECTRICAL Measurement Range 1 to 1000 A AC 1500 A Peak 1 to 1500 A DC Accuracy and Phase Shift 1 to 100 A 1 5 reading 1A 100 to 800 A 2 5 reading 800 to 1000 A 4 0 reading 1000 to 1500 A DC only 4 0 reading Phase Shift 45 to 65 Hz 10 to 200 A lt 2 5 200 to 1000 A lt 2 Overload 3000 A DC and 2000 A AC continuous up to 1 kHz MECHANICAL Jaw Opening 1 55 40 mm Maximum Cable Diameter One 1 5 39 mm or one bus bar 1 96 x 0 49 50 x 12 5 mm or Two 0 98 25 mm or two bus bars 1 96 x 0 19 50 x 5 mm Dimensions without zero knob 9 31 x 3 82 x 1 73 236 5 x 97 x 44 mm Weight 1 06 Ib 480 g Reference conditions 18 to 28 C 20 to 75 RH external magnetic field lt 40 A m no DC component no external current carrying conductor test sample centered 1 MQ lt 100 pF load zero adjustment prior to measurement DC only DC to 65 Hz Battery voltage 9 V 0 1 V Typical Model HHM71 Error in x Response Curves Typical Accuracy in DC 10 1
3. e Select the appropriate AC mV or V range on the DMM or measuring instrument e The DC zero adjustment is not required when measuring AC current with a voltmeter that is AC coupled The DC zero adjustment is required if you are using a voltmeter that is DC coupled e Select the appropriate mV AC or V AC range on the DMM or measuring instrument e Clamp the probe around the conductor 1 to be tested The display device should now display the measured conductor current Apply the conversion ratio 1mV A to get the value of the current Indicator Lights Green LED e The green LED 5 indicates that the probe is on and that the battery is good The green LED will not light under low battery conditions Replace the 9 V battery if the green LED is not lit 12 HHM74 y 1 6 42 mm an Cable max 1 96 x 0 19 50 x 5 mm Dual Bus Bar max y 0 98 25 mm Dual Cable max OUTPUT 1500 A 1 mV A HHM74 ACIDC CURRENT PROBE E OMEGA 7 Conductor Jaws Protective non slip guard Zero adjustment knob Green light on when battery voltage 6 5 V Two position range selection switch e On Off e 1500 A 1 mV A Lead 5 ft 1 5 m Safety banana plug 4 mm DMM Display Compatibility The Models HHM71 and HHM74 current probes are compatible with any multimeter voltmeter or other voltage measuring instrument which has the follo
4. 1 mV A Frequency Range DC to 10 kHz 3 dB Noise DC to 1 kHz lt 1 mV peak to peak DC to 5 kHz lt 1 5 mV peak to peak 0 1 Hz to 5 kHz lt 500uV peak to peak Rise and Fall Time Rise lt 100us from 10 to 90 Vout Fall lt 120us from 10 to 90 Vout Load Impedance gt 100 kQ 100 pF Insertion Impedance 0 39 MQ 50 Hz 58 MQ 1000 Hz Working Voltage 600 Vrms Common Mode Voltage 600 Vrms Influence of Adjacent Conductor lt 10 mA A at 50 Hz at 23 mm from the probe Influence of Conductor in Jaw Opening 0 5 reading DC to 440 Hz Battery 9 V alkaline NEDA 1604A IEC 6LR61 6LF22 Low Battery Green LED on when battery voltage 6 5 V Battery Life Approx 120 hours with alkaline battery HHM71 amp Common Specifications Continued Operation Examples Measuring the AC Component of an AC DC Waveform for the MECHANICAL Model HHM74 Output Double insulated 5 ft 1 5 m lead with safety banana plugs Conductor carrying 20 A DC 250 A AC e Voltmeter placed in AC volts mode Operating Temperature Range 14 to 131 F 10 to 55 C Voltmeter displays 250 0 mV AC 250 A AC Storage Temperature Range 40 to 176 F 40 to 80 C Temperature Influence lt 100 ppm K or 1 10 K lt 0 3 A K on Zero Operating Relative Humidity 10 to 35 C 90 5 RH without condensation 40 to 55 C 70 5 RH without condensation Humidity Influence 10 to 90 RH refe
5. 00 1000 10 12 14 16 18 Primary current in amperes Model HHM74 Typical Accuracy in DC 1 10 100 1000 10 000 2 0 EA o e 2 S 4 5 3 xt 6 8 10 Primary current in amperes 17 Tips for Getting the Best Accuracy These probes are capable of measuring DC and frequency currents over a wide range Here are some key considerations for getting the most accuracy from your display instrument e When using the Models HHM71 and HHM74 with a DMM or other meter it is important to select the range that provides the best resolution e Make sure that probe jaw mating surfaces are free of dust and contamination e Beware of short circuit currents Large in rush DC currents which can occur when power is first applied in a circuit and large high current transients may cause varying degrees of residual readings If in doubt of a particular reading remove the probe from the conductor under test and check to see that the display device returns to zero If not it will be necessary to rezero the probe 16 Common Specifications HHM74 ELECTRICAL Output Signal
6. Treatment pH Conductivity amp Dissolved Oxygen Instruments M 3477 0899 99 MAN 100183 v1 09 99 omega com LE OMEGA http www omega com e mail info omega com Model HHM71 Model HHM74 AC DC Current Probes WARRANTY DISCLAIMER OMEGA ENGINEERING INC warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase OMEGA Warranty adds an additional one 1 month grace period to the normal one 1 year product warranty to cover handling and shipping time This ensures that OMEGA s customers receive maximum coverage on each product If the unit should malfunction it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limited to mishandling improper interfacing operation outside of design limits improper repair or unauthorized modification This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of being damaged as a result of excessive corrosion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of OMEGA s contr
7. Where Do Find Everything Need for Process Measurement and Control OMEGA Of Course TEMPERATURE S a E S Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies Wire Thermocouple RTD amp Thermistor Calibrators amp Ice Point References Recorders Controllers amp Process Monitors B Infrared Pyrometers PRESSURE STRAIN FORCE E a El E Transducers amp Strain Gauges Load Cells amp Pressure Gauges Displacement Transducers Instrumentation amp Accessories FLOW LEVEL E S G iE E E dj i E C l Rotameters Gas Mass Flowmeters amp Flow Computers Air Velocity Indicators Turbine Paddlewheel Systems Totalizers amp Batch Controllers pH CONDUCTIVITY E pH Electrodes Testers amp Accessories Benchtop Laboratory Meters Controllers Calibrators Simulators amp Pumps Industrial pH amp Conductivity Equipment DATA ACQUISITION El Data Acquisition amp Engineering Software l Communications Based Acquisition Systems E Plug in Cards for Apple IBM amp Compatibles l Datalogging Systems Recorders Printers amp Plotters HEATERS E Heating Cable El Cartridge 8 Strip Heaters El Immersion amp Band Heaters E Flexible Heaters E Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL Metering 8 Control Instrumentation Refractometers Pumps amp Tubing Air Soil 8 Water Monitors Industrial Water amp Wastewater
8. battery Completely disconnect the probe from the circuit under test and from the oscilloscope or measuring instrument Turn the probe Off unscrew the battery compartment screw and remove cover Replace the battery and put the cover back on e Do not replace the battery while the probe is in use Cleaning e Clean the body of the clamp with a cloth lightly moistened with soapy water Wipe clean with a cloth moistened with clean water and dry Do not use solvent 18 Packaging The AC DC Current Probes Model HHM71 and Model HHM74 include 9 V battery and user manual Description The Models HHM71 and HHM74 are the newest line of professional AC DC current probes They are designed to the latest safety and performance standards Two different hook shaped jaws are offered both permitting the user to pry into or hook onto cables will accept 2 x 500 MCM or small bus bars Differing from traditional AC transformers AC DC current sensing is often achieved by measuring the strength of a magnetic field created by a current carrying conductor in a semiconductor chip using the Hall effect principle When a thin semiconductor is placed at right angles to a magnetic field and a current is applied to it a voltage is developed across the semiconductor This voltage is known as the Hall voltage named after the US scientist Edwin Hall who first reported the phenomenon Since the Hall voltage is not dependent on a reversing magn
9. etic fiels but only on its strength the device can be used for DC measurement Second when the W_ magnetic field strength varies due to T varing current flow in the conductor response to change is instantaneous Thus complex AC wave forms may be detected and measured with high x accuracy and low phase shift The basic in ca construction of a probe jaw assembly is iai shown Figure 1 Note one or two Hall Sere generators are used depending on the type of current probe Figure 1 Conductor The electronics and batteries are self contained in the handles The output of the AC DC probes is 1 mV A When taking DC measurements a mechanical DC zero allows the user to adjust for any DC offset There is no output filtering True RMS with DC components is possible Phase shift is excellent making the MR series well suited for power and power quality applications Model HHM71 measures 400 A AC 600 A peak 600 A DC Model HHM74 measures 1000 A AC 1500 A peak 1500 A DC Both of the probes have proportional mV output for direct readings on multimeters recorders loggers and other instruments accepting banana plugs An optional banana plug to BNC adaptor is available as an accessory 3 HHM71 Specifications ELECTRICAL Measurement Range 1 to 400 A AC 600 A Peak 1 to 600 A DC Accuracy and Phase Shift 1 to 100 A 1 5 reading 1A 100 to 400 A 2 0 reading 400 to 600 A DC only 2 5 reading
10. ity medical application used on humans or misused in any way OMEGA assumes no responsibility as set forth in our basic WARRANTY DISCLAIMER language and additionally purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product s in such a manner RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the OMEGA Customer Service Department BEFORE RETURNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence The purchaser is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit FOR WARRANTY RETURNS please have the following FOR NON WARRANTY REPAIRS consult information available BEFORE contacting OMEGA OMEGA for current repair charges Have the 1 P O number under which the product was following information available BEFORE PURCHASED contacting OMEGA 2 Model and serial number of the product under 1 P O number to cover the COST of the repair warranty and 2 Model and serial number of product and 3 Repair instructions and or specific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGA s policy is to
11. l 2 in contact aptitude criteria B 8 kV level 3 in the air aptitude criteria B Radiated Field IEC 1000 4 3 1995 with max interference of 5 of the measurement range 3 V m level 3 aptitude criteria A Fast transients IEC 1000 4 4 1995 Test voltage 1 kV level 2 aptitude criteria B Magnetic fields at the frequency of the network to IEC 1000 4 8 1995 with a max distortion of 0 5 A 30 A m 50 Hz level 4 aptitude criteria A Emissions in accordance with EN 50081 1 Radiated emission through the case to EN 55022 1994 class B Conducted emission to EN 55022 1994 class B HHM71 y 1 18 30 mm Cable max y 0 95 24 mm Dual Cable max O Conductor Jaws Protective non slip guard DC adjustment knob Green light on when battery voltage 6 5 V OUTPUT 600 A 1 mV A AC DC CURRENT PROBE LE OMEGA Two position range selection switch e On Off e 600 A 1 mV A Lead 5 ft 1 5 m Safety banana plug Y 4 mm Operation Examples DC Current Measurement Example for the Model HHM71 e Conductor carrying 25 A DC in the direction of the arrow e DMM placed in DC volts mode e DMM displays 25 0 mV DC 25 A DC A soov car m 6008 600A Nn orr OUTPUT 600 A 1 mV A HHM71 ACIDC CURRENT PROBE OMEGA 13 AC Measurement
12. lic Ostravska 767 733 01 Karvina Tel 420 69 6311627 e mail czech omega com France 9 rue Denis Papin 78190 Trappes Tel 33 130 621 400 FAX 33 130 699 120 Toll Free France 0800 4 06342 e mail france omega com Germany Austria Daimlerstrasse 26 D 75392 Deckenpfronn Germany Tel 49 07056 3017 FAX 49 07056 8540 Toll Free in Germany 0130 11 21 66 e mail germany omega com United Kingdom 25 Swannington Road P O Box 7 Omega Drive 150 9002 Certified Broughton Astley Leicestershire Irlam Manchester LE9 6TU England M44 5EX England Tel 44 1455 285520 Tel 44 161 777 6611 FAX 44 1455 283912 FAX 44 161 777 6622 Toll Free in England 0800 488 488 e mail uk omega com FAX 420 69 6311114 It is the policy of OMEGA to comply with all worldwide safety and EMC EMI regulations that apply OMEGA is constantly pursuing certification of its products to the European New Approach Directives OMEGA will add the CE mark to every appropriate device upon certification The information contained in this document is believed to be correct but OMEGA Engineering Inc accepts no liability for any errors it contains and reserves the right to alter specifications without notice WARNING These products are not designed for use in and should not be used for patient connected applications Table of Contents Warning irreali eni adria 2 International Electrical SyMbolS eee eee ee 2 Receiving Your Shipment
13. make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering OMEGA is a registered trademark of OMEGA ENGINEERING INC Copyright 1996 OMEGA ENGINEERING INC All rights reserved This document may not be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form in whole or in part without prior written consent of OMEGA ENGINEERING INC omega com FE OMEGA OMEGAnet On Line Service http www omega com Internet e mail info omega com Servicing North America USA One Omega Drive Box 4047 ISO 9001 Certified Stamford CT 06907 0047 Tel 203 359 1660 e mail info omega com Canada 976 Bergar Laval Quebec H7L 5A1 Tel 514 856 6928 e mail canada omega com FAX 203 359 7700 FAX 514 856 6886 For Immediate Technical or Application Assistance USA and Canada Sales Service 1 800 826 6342 1 800 TC OMEGA Customer Service 1 800 622 2378 1 800 622 BEST Engineering Service 1 800 872 9436 1 800 USA WHEN TELEX 996404 EASYLINK 62968934 CABLE OMEGA Mexico and Tel 95 800 TC OMEGA FAX 95 203 359 7807 Latin America En Espanol 203 359 1660 ext 2203 e mail espanol omega com Servicing Europe Benelux Postbus 8034 1180 LA Amstelveen The Netherlands Tel 31 20 6418405 FAX 31 20 6434643 Toll Free in Benelux 06 0993344 e mail ni omega com Czech Repub
14. nob 4 to obtain a reading better than 0 5 mV on the DMM For best accuracy especially on low level measurement it is recommended that you zero the probe before each measurement Clamp the probe around the conductor 1 to be tested The DMM or display device should now display the measured conductor current A positive reading indicates current flowing in the direction of the arrow located on the side of the jaw 2 A negative reading indicates current flow in the opposite direction of the arrow Apply the conversion ratio 1mV A to get the value of the current eg If the multimeter reading is 250 mV DC the measured current is 250 A DC 11
15. nstrument probe probe cable and output terminals prior to use Replace any defective parts immediately NEVER use the current probe on electrical conductors rated above 600 V in overvoltage category Ill CAT III Use extreme caution when clamping around bare conductors or bus bars International Electrical Symbols This symbol signifies that the probes are protected by double or IS reinforced insulation Use only specified replacement parts when servicing the instrument This symbol signifies CAUTION and requests that the user refer to the user manual before using the instrument Receiving Your Shipment Upon receiving your shipment make sure that the contents are consistent with the packing list Notify Omega of any missing items If the equipment appears to be damaged file a claim immediately with the carrier and notify Omega at once giving a detailed description of any damage Notes Maintenance A Warning e For maintenance use only specified replacement parts e Avoid electrical shock do not attempt to perform any servicing unless you are qualified to do so e Avoid electrical shock and or damage to the instrument do not get water or other foreign agents into the case Turn the current probe OFF and disconnect the unit from all circuits before opening the case e Also see Warning on Page 2 Battery Replacement e When the probe is turned on the green LED should light up If it does not replace the 9 V
16. ol Components which wear are not warranted including but not limited to contact points fuses and triacs OMEGA is pleased to offer suggestions on the use of its various products However OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA either verbal or written OMEGA warrants only that the parts manufactured by it will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER EXPRESSED OR IMPLIED EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract warranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activ
17. rence temperature lt 0 1 R Altitude Operating 0 to 2000 m Non operating 0 to 12 000 m Zero Adjustment 10 A approx by 10 turn knob at base of case Case Protection IP30 per IEC 529 Drop Test 1 0 m on 38 mm of oak on concrete test according to IEC 1010 asa Mechanical Shock 100 G test per IEC 68 2 27 ssa EA Vibration Test per IEC 68 2 6 SE Frequency Range 5 to 15 Hz Amplitude 1 5 mm 15 to 25 Hz Amplitude 1 mm HHM74 25 to 55 Hz Amplitude 0 25 mm AGIDE CURRENT PROBE OMEGA OUTPUT 1500 A 1 mV A Handle UL 94 VO Jaws UL 94 VO Color Dark gray with red jaws Operation Examples Measuring the DC Component of an AC DC Waveform for the Model HHM71 e Conductor carrying 300 A DC 25 0 A AC e DMM placed in DC volts mode e DMM displays 300 0 mV DC 300 A DC onO A soovcar m sooa D 600A N OFF r OUTPUT 600 A 1 mV A HHM71 AC DC CURRENT PROBE E OMEGA 14 Common Specifications Continued SAFETY CE Double insulation or reinforced insulation between primary secondary and outer case of handle per IEC 1010 2 032 600 V Category III Pollution Degree 2 Electromagnetic Compatibility Susceptibility in accordance with EN 50082 2 and EN 50082 1 Electrostatic discharge IEC 1000 4 2 Test voltages 4 kV leve
18. wing features Input jack that accepts 4 mm safety banana plug Range and resolution capable of displaying 1 mV of output per amp of measured current Voltmeter accuracy of 0 3 or better to take full advantage of the probe accuracy Input impedance of 1 MQ 100 pF or greater When the probe is making a measurement the current carrying conductor is not broken and remains electrically isolated from the probe output As a result the probe output common may be either floated isolated or grounded Warning User Safety Always use a DMM voltmeter or other displaying device appropriately rated for safety Also see warning on page 2 10 Operating Procedure Making Measurements with the Models HHM71 and HHM74 Plug the probe into the display device e g DMM logger Note the polarity of the probe output banana plugs red positive black negative Select the appropriate range on the display device Note that the probe s output is 1 mV A Turn display device power on Turn on 6 the probe the green LED 5 should be on If the green indicator does not come on or goes off after a few minutes it is necessary to replace the battery see Battery Replacement pg 18 DC Measurement Select the appropriate DC mV or V range on the DMM or measuring instrument Zero the probe With the probe disconnected from test samples no conductor in probe jaw window push in and turn the zero adjustment k
Download Pdf Manuals
Related Search