HHM81 and HHM82 - OMEGA Engineering
Contents
1. Description These microprobes are low current measurement instruments that feature a compact high sensitivity current probe Unlike other instruments the Model HHM81 exhibits a wide dynamic operating range which extends from below 100HA to 4 5 A peak from DC to 2 0 kHz without the need for ranging The HHM82 has an operating range of 100uA to 450 mA Peak from DC to 1500 Hz This series is designed to be operated in conjunction with a digital multimeter oscilloscope or recording device The microProbe outputs the current measured in the form of a voltage that is the image of the current in shape and amplitude The Model HHM81 outputs 1 mV per mA of measured current The Model HHM82 outputs 10 mV per mA of measured current To take advantage of the Model HHM82 s high sensitivity best results are obtained through 4 1 2 digit or more DMM with a relative zero function The Model HHM82 was designed to provide the operator with enhanced low current linearity and accuracy but is limited to 450 mA Peak current The microprobes always output a signal proportional to the total current AC DC in the conductor under test This has proven to be the most versatile signal output format and allows the user to isolate and measure DC and AC components of measured current separately if so desired Typical applications include 4 to 20 mA loop measurements automotive current applications benchtop electronic current consumption in circuits2. 4 4 x 0 6 x 1 0 111 x 15 x 25 mm Dimensions Electronic Module 4 9 x 2 5 x 1 1 124 x 64 x 28 mm Cable Length 5 ft 1 5 m Weight 9 oz 250 g Operating Temperature 14 to 131 F 10 to 55 C Storage Temperature 40 to 176 F 40 to 80 C Humidity lt 95 35 C 75 55 C SAFETY SPECIFICATIONS C The MicroProbes are designed to be used in conjunction with a digital multimeter or other instrument for the purpose of displaying measured readings The Models HHM81 and HHM82 are safety rated as voltage probes The user should ensure that they are connected to an instrument properly rated to international safety standards and or agency approvals Working Voltage 300 V per IEC 1010 1 Cat II Immunity EN 50082 1 IEC 1000 4 3 aptitude criteria A DC 15mV 0 AC 60Hz 2dB from 10 mA to 4 5A Emmissivity EN 50081 1 negligible Drop Test 1 m per IEC 1010 Shocks 100 G per IEC 68 2 27 Vibrations IEC 529 Protection Index IP 40 per IEC 529 Electromagnetic Compatibility s 50082 1 class A EN 50081 1 Oscilloscope Measurement Example HHM81 To Oscilloscope Current Waveform Oscilloscope Output 20A l l j oa LU P Figure 5 Maximum Step Discontinuity Example HHM81 e Conductor carrying non sinusoidal AC e Model HHM81 connected to oscilloscope e Max allowable step discontinuity 2 A Note Step Disco
3. and other applications requiring very low current measurements in crowded areas 1 Oscilloscope Measurement Example HHM82 e Conductor carrying a 0 2 A peak AC waveform e Model HHM82 connected to oscilloscope To Oscilloscope t o OL A CAT III INPUT 0 4 5 A DC AC peak Current Waveform Oscilloscope i1mV imA OFF Output O24 0 2A i TSE g UL HHM81 DC AC MICROPROBE Oz OMEGA Figure 9 Positive Red banana plug Negative Black banana plug Power ON indicator green LED OVERLOAD indicator red LED Power switch Zero adjust knob push in and turn to zero Probe window aperture 1 2 3 4 5 6 7 8 Probe handle Measuring the DC Component of an AC DC Waveform HHM81 e Conductor carrying 20 0 mA DC 15 0 mA AC e Voltmeter placed in DC Volts mode e Voltmeter displays 20 0 mV f e OO a 15 mA AC Re o K A 20 mA DC w a Figure 7 Measuring the AC Component of an AC DC Waveform HHM81 e Conductor carrying 20 0 mA DC 15 0 mA AC e Voltmeter placed in AC Volts mode e Voltmeter displays 15 0 mV _ wA Mg Hay 15 mA AC O a 20 mA DC lt r ree g V gt Figure 8 12 HHM81 Specifications ELECTRICAL Current Range O to 4 5 ADC 0 to 3 Arms sinus
4. the DC Component of an AC DC Waveform 12 Measuring the AC Component of an AC DC Waveform 12 Oscilloscope Measurement HHM82 ccceeeceeeeeeeereseeeeeeeeeens 13 Tips for Making Precise Measurement ecceereeereeenetenees 14 Residual Readings Following Severe Overloads ceceee 15 Maintenance 0 0 cee eeeeeceseeeeneeeeeeeeneeeeeeeseaeeseneeeseaeeseeeeneaeeseeeseneeenaes 16 WaAMING eiaeaen diated i ii daai 16 Battery Replacement uu eeeeeseeeesereteneeeeeeeeeeeeeeseeeseneeeenetenaas 16 CIGANING E E lenis ees a eee 16 International Warning These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument 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 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 adapter to the display device before clamping the probe onto the sample being tested ALWAYS inspect the instrument probe probe cable and output terminals prior to use Replace any defective parts immediately NEVER use the pr
5. the module output banana plugs red positive black negative Select the appropriate range on displaying device e g DMM oscilloscope Note that the module output is 1 mV mA for Model HHM81 and 10 mV A for Model HHM82 Turn displaying device power ON Turn on the probe the green LED should be ON and the red LED OFF e With the probe disconnected from test samples no conductor in probe jaw window adjust the zero control push in the knob and turn to read zero volts on the displaying device In the unlikely event where the zero point is unobtainable refer to Residual Readings Following Severe Overloads section pg 15 The probe may be temporarily magnetized e Clamp the probe around the conductor to be tested The displaying device should now display the measured conductor current In DC a positive reading indicates current flowing in the direction of the arrow on the probe A negative reading indicates current flow in the opposite direction of the arrow Indicator Lights Green and Red LEDs e The green LED 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 e The red LED indicates a momentary or continuous overload of the instrument Readings taken while the red LED is ON or FLASHING should be considered inaccurate Momentary or continuous currents exceeding 4 7 A for Model HHM81 a
6. M81 and HHM82 are capable of making measurements of DC and low frequency currents over a wide range Here are some key considerations for getting the most accuracy from your displaying instrument e When using the probes with a meter it is important to select the range that provides the best resolution Failure to do this may result in measurement errors The following examples use an ordinary 3 1 2 digit DMM with the probes to measure 16 7 mA DC Resolution 10 mV Resolution 1 mV Resolution 100V Display Error 19 8 Display Error 1 8 Display Error 0 oe A SS GeV OTT 16 Ta Model tc AT HHM81 n 16 7 mA gt Figure 10 Resolution 10 mV Resolution 1 mV Resolution 100V Display Error 1 8 Display Error 0 Display Error 0 p Cen Model T T HHM82 i Do Zero lt _ fara 16 7 mA _ gt Figure 11 14 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 Packaging The Models HHM81 and HHM82 include a electronic plug in module with an attached current probe 9 V battery and user manual
7. Where Do Find Everything TEMPERATURE Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies Ehen e i E U E E E E 7 a ey fey a AS E O mm Fa Fa Fah fa I E E ey a m RESSURE NVIRONMENTAL Eki i fo h Wire Thermocouple RTD amp Thermistor Calibrators amp Ice Point References Recorders Controllers amp Process Monitors Infrared Pyrometers STRAIN FORCE Transducers amp Strain Gauges Load Cells amp Pressure Gauges Displacement Transducers Instrumentation amp Accessories LOW LEVEL Rotameters Gas Mass Flowmeters amp Flow Computers Air Velocity Indicators Turbine Paddlewheel Systems Totalizers amp Batch Controllers H CONDUCTIVITY pH Electrodes Testers amp Accessories Benchtop Laboratory Meters Controllers Calibrators Simulators amp Pumps Industrial pH amp Conductivity Equipment ATA ACQUISITION Data Acquisition amp Engineering Software Communications Based Acquisition Systems Plug in Cards for Apple IBM amp Compatibles Datalogging Systems Recorders Printers amp Plotters EATERS Heating Cable Cartridge amp Strip Heaters Immersion amp Band Heaters Flexible Heaters Laboratory Heaters MONITORING Metering amp Control Instrumentation Refractometers Pumps amp Tubing Air Soil amp Water Monitors Industrial Water amp Wastewater Treatment pH Conductivity amp Dissolved Oxygen Instrume
8. be and inspect mating surfaces They should be free of dust particles or any other contamination Otherwise repeat the cleaning process starting again at step 1 16 Table of Contents WaN geseen aaiae aaa aa E Oae a aaea iDATA Eae 2 International Electrical SyMbOIS c ccecceeeceeeeeeeeeeeneeeeeeseeeseeetetesees 2 Receiving Your SHIPMeENt eeceeceeeeeeeeeeeeeeeeeeeeeeeeereeeeeseeeeeateseneseeeeas 3 PaCkaGING sisi ta aAeiensiai ia dno gue iedh Wark 3 DO SCIrIPUON iisicec i rgcedees dad naaa e eai ia iai 3 SPECIICALIONS sonare eaa aaa EE EEEE AN S deter EEEE 5 Typical Frequency RESPONSE cccceeeeeeeeeeeeeeeeeeeeeeeceeeeeeeteneeeeete 7 Operating Procedure ccecceeceeseeseeeteeeeeeeeeneeseeeeeeeeeaeesieetieeeeaeetineteees 8 Making Measurements with the Models HHM81 HHM82 8 Indicator LiIQhtS ricessi ute tie d eapi a aa iat 8 Operation Examples ccccccceeeeeceeeeeeeeeeeeeeeeeseeeeseaeeeeeaeeeseeeeeenetess 9 DC Current Measurement cccceceeeceseereeeeeseeeeeereteateeeeeseateeeneteate 9 DC Current Measurement Current Reversed s es 9 Two Wire Sum of Currents cecceeceeeeeeeneeeeneeeneeeeneeeeeeeaeeseeeeaeees 10 Two Wire Current Differential 0 cc eeceeeceeeeeeeeeeeeeeeeeeeeenreeeateeees 10 Oscilloscope Measurement HHM81 ccceeeceeeeeeenreeeeeeeeeeens 11 Maximum Step Discontinuity eecceeeeeeeteeeeeeeeteneeeeeeteteseeeeeaes 11 Measuring
9. cific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGA s policy is to 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 FAX 203 359 7700 e mail info omega com Canada 976 Bergar Laval Quebec H7L 5A1 Tel 514 856 6928 FAX 514 856 6886 e mail canada omega com 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 Amst
10. elveen The Netherlands Tel 31 20 6418405 FAX 31 20 6434643 Toll Free in Benelux 06 0993344 e mail n omega com Czech Republic Ostravska 767 733 01 Karvina Tel 420 69 6311627 FAX 420 69 6311114 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 uu omega com 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 Approact 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 withou notice WARNING These products are not designed for use in and should not be used for patien connected applications Ma
11. intenance A Warning For maintenance use only specified replacement parts To avoid electrical shock do not attempt to perform any servicing unless you are qualified to do so To avoid electrical shock and or damage to the instrument do not get water or other foreign agents into the case Turn the Model HHM81 HHM82 OFF and disconnect the unit from all circuits before opening the case Also see warning on page 2 Battery Replacement Remove probe from any conductor and place it away from any active conductors circuitry etc Unplug electronic module from display device e g DMM oscilloscope Remove the screws from the bottom cover of the electronic module Replace battery with a new 9 V alkaline type Replace bottom cover and re attach with screws Cleaning To ensure optimum performance it is important to keep the probe jaw mating surfaces clean at all times Failure to do so may result in increased earth s field susceptibility and overall errors in readings The following is the recommended procedure for cleaning the probe sensor 1 Apply a few drops of isopropyl alcohol to an ordinary sheet of white photocopy paper Open probe to expose the mating surfaces of the sensor and insert the sheet of paper into the jaws Allow the jaws to close With the jaws closed pull free the end of the paper through the jaws until it releases Repeat step 3 several times using a new dry section of paper each time Open pro
12. nd 470 mA for Model HHM82 and dynamic currents with large step discontinuities will cause the red LED to turn ON Operation Examples DC Current Measurement Example HHM81 e Conductor carrying 20 0 mA DC in the direction of the arrow e Voltmeter placed in DC Volts mode e Voltmeter displays 20 0 mV ciO N K9 lt lt Hoze g 20mADC J L Figure 1 DC Current Measurement Example Current Reversed HHM81 e Conductor carrying 20 0 mA DC in opposite direction of arrow e Voltmeter placed in DC Volts mode e Voltmeter displays 20 0 mV P COO OEG am E 20mADC Figure 2 9
13. ntinuities To Oscilloscope t 2 0 V Current Waveform B 2A Oscilloscope Output 0 2A m oS FA Figure 6 11 Two Wire Sum of Currents Example HHM81 e Two conductors in probe aperture note orientations e Voltmeter placed in DC Volts mode e Voltmeter displays 18 0 Mv 7mA DC 11 mA DC Figure 3 Two Wire Current Differential Example HHM81 e Two conductors in probe aperture note orientations e Voltmeter placed in DC Volts mode e Voltmeter displays 4 0 mV A 7 mA DC 11 mA DC gt gt 05 C e a E g oT lt lt lt Figure 4 10 Typical Frequency Response Decibels dB Decibels dB i 2 0 2 5 3 0 3 5 4 0 Model HHM81 Typical Frequency Response Frequency Hz 50 200 f 400 600 800 1000 1200 1400 1600 1800 2000 2200 Model HHM82 Typical Frequency Response Frequency Hz Q 5 200 400 600 1000 1200 1400 1600 30 mA 30A 0 300 mA RMS Operating Procedure Making Measurements with the Models HHM81 HHM82 e Remove any conductor from within the probe jaws e Plug the electronic module into the displaying device e g DMM oscilloscope Note the polarity of
14. nts AND Need for Process Measurement and Control OMEGA Of Course M 3481 0899 CE O A O ON OL wv carm INPUT 0 4 5 A DC AC peak 1 mV mA OFF DC AC MICROPROBE LE OMEGA CONTROL 99 MAN 100181 le omega com PE OMEGA http www omeg a com amail Model HHM81 Model HHM82 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 corr
15. obe on electrical conductors rated above 300 V in overvoltage category II CAT Il Electrical Symbols This symbol signifies that the probes are protected by double or 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 Make sure that probe jaw mating surfaces are free of dust and contamination Contaminants cause air gaps between sensor halves making the Model HHM81 HHM82 susceptible to external magnetic fields which can contribute to measurement errors See page 16 for cleaning procedure Do not allow probe jaws to abruptly snap closed from the open state This can lead to residual readings If this happens the probes will need to be rezeroed Beware of short circuit currents Large in rush 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 zero If not it will be necessary to rezero the Models HHM81 and HHM82 When using the probes to measure AC currents keep in mind the maximum current ratings and the frequency response curves shown in the electrical specifications section Dynamic currents that contain large step discontinuities and or frequency constituent
16. oidal Output Vout 1 mV mA Resolution DC 50pA typical AC 100WA typical Accuracy DC 1 reading 200pA AC 2 reading 200uUA Output Noise lt 100uV DC to 5 kHz Frequency Response DC to 2 kHz 3 GB sine Zero Adjust 25 mA HHM82 Specifications ELECTRICAL Current Range 0 to 450 mA DC 0 to 300 mA rms Output Vout 10 mV mA Resolution DC 50pA typical AC 100A typical Accuracy DC 0 5 reading 150A AC 0 8 reading 200UA Output Noise lt 100uV DC to 5 kHz Frequency Response DC to 1500 Hz 3 GB sine Zero Adjust 1 mA COMMON SPECIFICATIONS ELECTRICAL Rise Time lt 200uS 10 to 90 Vout Fall Time lt 200uS 90 to 10 Vout Output Impedance 2002 Probe Inductance lt 1uH Influence of Adjacent Conductor lt 50uA A Influence of Earth s Field lt 120pA null to maximum Reference Conditions Temperature 23 C 20 to 75 RH battery voltage 9 V 0 1 V earth s magnetic field lt 40 A m absence of AC fields input impedance of display device 1 M 100 pF DC or sinusoidal AC current 45 65 Hz 5 Common Specifications cont MECHANICAL Connectors Two 4 mm banana jacks standard 3 4 19 mm spacing Maximum Conductor Diameter 3 16 0 180 4 5 mm Overload LED Red Indicates momentary or continuous overload Power LED Green Indicates power ON and good battery Battery 9 V alkaline NEDA 1604 or IEC 6 LF22 Dimensions Probe
17. osion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of OMEGA s control 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 in
18. s near or beyond the measurement passband are subject to measurements errors and waveform distortion oscilloscope display If the red LED comes on during measurement the output signal may be in error Many DVMs provide null relative measurement capability A DVM placed in the null mode displays the difference between a stored null value and the input signal You can use a DVM s null function in place of the external DC zero control to cancel any DC offset from the Models HHM81 HHM82 The DVM null function should be enabled with the probe removed from the conductor immediately before measurement You can use a DVM s null function to display changes in measured current from a fixed constant level In this application the DVM null function is enabled with the probe connected to the conductor When making null relative measurements the probe aperture current not displayed current must not exceed the maximum ratings set forth in the specifications section Residual Readings Following Severe Overloads e Large short circuit and transient currents outside the operating range of the probe may cause large residual readings In extreme cases they will not zero If this happens Remove the probe from the test conductor Open the probe and release allowing the jaws to snap back Repeat this step several times Rezero the instrument before making successive measurements 15 Tips For Making Precise Measurements e The Models HH
19. stallation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activity 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 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 spe
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