Hameg HM8012 Programmable Multimeter
Contents
1. 18 Y pushbutton Pushbutton for selecting the next function 19 A pushbutton Pushbutton for selecting the previous function On startup the unit switches automatically to the DC voltmeter MANUAL mode function and 1000 Volt Range Choice of multimeter functions Beginning in Volt Range V by using the keys A 19 and 18 you can step through all the multimeter functions one by one in following order DCorAC voltages Input on the V Q T dB and COM connectors m The measurement of DC or AC voltages in decibels reference 1mMVV 600Q Input to V Q T dB and COM connectors DCorAC current up to 500 mA Inputs on mA uA and COM connectors DCorAC current 10 A range Inputs on the A and COM connectors Resistors Inputs V Q T dB and COM connectors m Temperature in degrees Celsius Connection of probe to V Q T dB and COM connectors u Temperature in degrees Fahrenheit Connection of probe to V Q T dB and COM connectors Diode test Inputs on V Q T dB and COM connectors On each press the new function is indicated by an LED corresponding to the unit of the quantity to be measured It is possible to move from one function directly to any other function by a successive series of pressings Mode selection For current and voltage modes the AC DC key is used for choosing between DC voltage measurement AC or AC DC true rms voltage measurement Choice of range In manual mode Athe Wand2. and to be fully acquainted with the module when ater in use After unpacking the module check for any mechanical damage or loose parts inside Should here be any transportation damage inform the supplier immediately and do not put the module into operation This plug in module is primarily intended for us in conjunction with the Mainframe HM8001 Whe incorporating it into other systems the modu should only be operated with the specified supp voltages lt O50 Safety This instrument has been designed and tested in accordance with IEC Publication 1010 1 Safety requirements for electrical equipment for measurement control and laboratory use It corresponds as well to the CENELEC regulations EN 61010 1 All case and chassis parts are connected to the safety earth conductor Corresponding to Safety Class 1 regulations three conductor AC power cable Without an isolating transformer the instruments power cable must be plugged into an approved three contact electrical outlet which meets International Electrotechnical Commission IEC safety standards Warning Any interruption of the protective conductor inside or outside the instrument or disconnection of the protective earth terminal is likely to make the instrument dangerous Intentional interruption is prohibited The instrument must be disconnected and secured against unintentional operation if there is any suggestion that safe operation is not possible This
3. 3 to 6 masurements sec E Offset of any value as reference point E True RMS Measurement of AC or AC DC m Basic Accuracy 0 05 Max Resolution 10pV 0 001dBm 10nA and 10mQ E Input Resistance gt 1GQ 0 5V and 5V Communication by RS 232 link on front panel E Control of all functions with user friendly software HM 8012 is a programmable digital multimeter with 8 primary measurement functions including 42 ranges Autoranging provides optimum resolution of an unknown input magnitude The 5 digit bright display will represent a measured magnitude of up to 50 000 points The absolute resolution obtained is 10uV 10nA or 10mQ at a basic dc accuracy of 0 05 Input resistance exceeds 1GQ in the VDC mode allowing precise measurement on high source resistance True RMS measurements of AC voltage current even of distorted waveform are made up to 100kHz and AC DC value can be evaluated The multimeter is capab of making temperature measurement wit a Pt100 sensor in C or F up to 0 1 resolution At diode measurements th HM8012 shows the junction voltage of th DUT while a constant current is supplie Analyses of audio and communication circuits is easy because you can read in dB with a resolution of 0 01dB Offset compensation is employed to eliminate the effects of any line resistance influencing oeDdDnN 26 resistor measurements Any value can be set as anew reference point ZERO adjustment Calibration constants are stored
4. close to the ground of the measured quantity will be applied CAUTION For safety reasons the voltage across this terminal compared to the case guard wire ground shall be 500V at most 8 OFFSET LED Indicator denoting that the displayed value is a relative measurement The displayed value corresponds to the input value less the value present on the display during initial action on the HOLD OFFSET key 10 Activate this function by means of a second press on the HOLD OFFSET key 9 V Q T dB 4 safety terminal for 4 mm banana plugs Connection high potential for measurements of voltages resistances temperatures and diode junctions in conjunction with the COM input 7 safety terminal CAUTION For safety reasons the voltage across this terminal compared to the case guard wire ground shall be 1 000V at most 10 HOLD OFFSET pushbutton Pushbutton for validating the HOLD or OFFSET functions Pressing the key the first time will freeze the front panel display The HOLD indicator 6 then comes on The AUTO AC DC BEEP and keys are inoperative A second press gives access to the relative mode The value memorized by the HOLD function is then subtracted from each measurement before being displayed The OFFSET indicator 8 comes on A third press will freeze the relative value The HOLD 6 and OFFSET 8 indicators come on A fourth press will delete the HOLD and OFFSET mode NOTE When the HOLD OFFSET m
5. factor for a pulse type signal To avoid saturation of the HM8012 input stages make sure that the input signal peak value does not exceed 3 times the value of the range or 1000V At the middle of the measurement range the maximum crest factor is 6 The accuracy of the displayed value depends among other things on the rms value converter bandwidth Complex signal measurements will barely be influenced when there are no harmonic components in the measurement signal placed outside the 100 kHz 3 dB bandwidth of the converter Additional error due to high crest factor Error of reading CF 1 2 2 3 3 4 4 5 5 6 0 05 0 15 0 3 0 4 0 5 Another factor influencing the measurement precision is the duty cycle of the measurement signal The crest factor in this relation becomes CF VT t T period duration t pulse duration U pulse voltage 1 0 1 2 3 4 1 2 3 4 5 6 7 8 9 10 11 CF Accordingly a rectangular signal having a duty cycle of 1 has a crest factor of 10 The minimum pulse duration should be approximately 10 us Diode test Choose the diode test function using VW 18 or A 19 key For diode measurements connect the device under test DUT between the COM terminal and the V Q T dB terminal There is a DC voltage across the connection terminals Accordingly only voltage free objects need to be measured because any additional voltages i
6. ina EEPROM for each measurement range A software controlled calibration routine allows a complete instrument calibration without any manual adjustments All instrument functions can be controlled via a RS 232 standard interface with the provided software under Windows Gradients can be recorded over a given time and can processed under Excel Protection circuits ensure safe operation of HM 8012 protecting the equipment at the limit values as indicated against any damage resulting from manipulation errors The connection terminals are protected safe terminals The HM 8012 digital multimeter is an appropriate measurement instrument whenever the value obtained has to be highly accurate very stable in the long term and easy to use The programming feature of the HM 8012 permits integration in an automatic test environment as a system multimeter 22 Subject change without notice Specifications Reference temperature 23 C 1 C DC voltages Measurement ranges 500mvV 5V 50V 500V 1000V Resolution 10uV 100LV 1mV 10mV 100mV Accuracy 5V 500V 1000V 0 05 v M 0 002 v E 2 500mV 50V 0 05 v M 0 004 v E Max input voltage for 50V 500V und 1000V ranges 1000Vs for 500mV and 5V ranges 300Verf Input impedance for 50V 500V and 1000V ranges 10MQ 90pF for 500mV and 5V ranges gt 1GQ 90pF Input current 20A max 30 sec Common mode rejection ratio 2100dB 50 60Hz 0 5 Seri
7. is unavoidable This will not cause damage or put the instrument out of operation Small deviations of the measuring value reading exceeding the instruments specifications may result from such conditions in individual cases HAMEG GmbH Subject change without notice 35 HAMEL Instruments HAMEG GmbH Industriestra e 6 D 63533 Mainhausen Telefon 06182 800 0 Telefax 06182 800 100 E mail sales hameg de Internet www hameg de Stand 19 02 04 gw
8. 012 digital multimeter is performed mainly by software In order to enter the calibration menu keep both pushbuttons AUTO 15 and BEEP 3 depressed until the message CAL is displayed After the release of both pushbuttons the first calibration step will be indicated First the unit will be shown then the value of the calibration voltage etc which has to be applied to the instrument In this mode the following pushbuttons will function as given Pushbutton Action AUTO 15 Corrected value of the range selected if LED 2 is on otherwise the input of the preceding step will be displayed BEEP 3 Displays not yet calibrated values LED 2 will be on the value can be changed by pushbutton 15 gt 12 Changeover to the following calibration step lt 4 11 Changeover to the preceding calibration step AC DC 17 Stores the calibrated values Calibration procedure 1 Apply the calibration value specified 2 Press BEEP 3 The former not yet corrected value will be displayed LED 2 will be on 3 Press AUTO 15 to perform the calibration the corrected value should be displayed 4 Press 12 in order to proceed Pressing gt 12 will display the actual calibration infor mation without moving to another step Please note In order to guarantee a fully calibrated instrument be sure to perform a complete calibration cycle Hints Pressing just the AUTO 15 pushbutton w
9. 12 V1 03 lt CR gt l e manufacturer instrument reference void and software version Firmware F lt CR gt Requests current measurement function The instrument returns one of the following strings VOLT lt CR gt AMP lt CR gt MAMP lt CR gt OHM lt CR gt DIODE lt CR gt TDGC lt CR gt TDGF lt CR gt DB lt CR gt M lt CR gt Requests current measurement mode The instrument returns one of the six following strings AC lt CR gt DC lt CR gt AC DC lt CR gt BEEP ON lt CR gt BEEP OFF lt CR gt The two last responses are only obtained during resistance measure ment One indicates that the audible continuity test signal is active and the other that it is inactive NONE lt CR gt This string is the response given when the equipment is on temperature or diode measurement D lt CR gt Request for current display option The instrument sends back one of the strings HOLD lt CR gt REF lt CR gt HOLD REF lt CR gt NORMAL lt CR gt The REF string corresponds to the front panel OFFSET mode The NORMAL string indicates that the display is neither on HOLD nor on REF R lt CR gt Requests for current measurement range The instrument returns one of the following strings NUM lt CR gt NUM AUTO lt CR gt The first NUM field represents a digital character indicating the current range number Where applicable a second field is displayed indicating that the automatic range change mode is ac t
10. COM terminal must not exceed 500Vp with respect to ground Current ranges are protected by a fuse against overloads of up to 500mA If the fuse blows the cause of the overload must first be eliminated and then the fuse can be replaced See Protection from overloads paragraph for more details about fuse replacement The 10A current measurement function is not fuse protected Current in excess of 10A max 20A must therefore not circulate through HM8012 con tinuously The maximum current measurement time gt 10A max 20A is 30 sec For this function the AUTO mode is inhibited because there is only one range AC voltage measurement The instrument measures the true rms value of the input voltage with or without its DC component To measure low voltages or in the event of high noise it is possible to use a shielded cable Take into account the input impedance of the multimeter It is 1MQ in the AC mode and 10MQ in the AC DC mode In addition there is a slight measurement difference between these two modes due to the input circuits If AC mea surements without a DC component are to be made it is preferable to use the straight AC mode When the multimeter is used in AUTOMATIC mode there can be continuous swinging between two ranges for frequencies above 30kHz or so because of the frequency response difference of the two ranges After some swings the in strument goes into MANUAL mode Resistance measurements For resi
11. E RANGE DC C ACDC CAC i Beep m AUTO VOLT C dB C DIODE CAMP C mAMP C OHM CTF CTC PE All instrument functions can be controlled by a host computer through serial interface available in standard The WDM8012 software is a virtual instrument allowing the command of the instrument and the reading of its configuration This one can be saved and recalled later When the configuration of the instrument is done a set of measurements can be carried out and saved for future use Furthermore the software can show deviations of the values relative to two predetermined thresholds A DDE link is also possible which make easier the integration of the instrument in specific application software A software running under Excel allows automatic drawings of curves with a programmable delay between successive measurement ranging from 1s to 65s 1800001 11 31 31 34 Subject change without notice General information regarding the CE marking HAMEG instruments fulfill the regulations of the EMC directive The conformity test made by HAMEG is based on the actual generic and product standards In cases where different limit values are applicable HAMEG applies the severer standard For emission the limits for residential commercial and light industry are applied Regarding the immunity susceptibility the limits for industrial environment have been used The measuring and da
12. HAMEL Instruments Multimeter HM 8012 English sissien ences 21 4 4 Digit Programmable Current measurement 28 Multimeter HM80N2 22 AC voltage measurement 28 Resistance measurements 28 Operating Manual 008 24 Protection against overloads 28 General information 24 Crest Factor u nen 29 Safety hierie anr ine aani 24 Diode tSt caiene 29 Symbols as marked on equipment 24 Temperature measurements 29 Operating conditions 24 Decibel measurements 30 NA Y a EE terrier 24 Equipment remote control 30 Maintenance nee 24 Function commands 30 Operation of the module 25 Calibration commands 32 Function TeSt uses 32 HM 8012 Front panel commands 25 Measurement equipment used 32 Mode selection u 27 Adjustment procedure 33 Choice of range 27 Measurement value display 27 WDM8012 SOFTWARE 34 Measurement inputs 27 Voltage measurements 28 General information Input impedance in the V range 28 regarding the CE marking 35 Subject change without notice 21 4 4 Digit Programmable Multimeter HM 8012 ehe GGG A Ga 50 000 counts 4 digits Auto Range 42 measurement Ranges E Between
13. NIT lt CR gt precision calibrators are appropriate all the HM8012 NUM represents the digital value field measurements ranges can be checked using the in IEEE NR2 format in our case 5 following tables which indicate the limit values significant digits at most with the Recalibration however should only be performed if presence of a decimal point The the appropriate precision calibrator is available significant digits are those of the front Before any change of ranges ensure that the signal panel display at HM8012 does not represent an unacceptable load UNIT is the field giving as suggested of the object under examination For the link between by the name the unit ora sub multiple the calibrator and HM8012 shielded cables must thereof The possible values are identical be used to prevent any unwanted influence caused to that of the front panel by the measurement signal E lt CR gt Request for status of command error a DC voltage ranges indicator The instrument returns A imi O lt CR gt if the command or commands No Range eg Displaylimits received previously have not generated t an error 1 lt CR gt if one of the com 1 500 mV 1250 mV 249 85 250 15 mands received previously has 2 5V 2 5V 2 4986 2 5014 generated an error 3 50V 25 V 24 985 25 015 errorindicatort00 Indeed inthe event 00V 250v 249 86 250 14 Beh vine even 5 T1000V 900V 899 5 900 5 of an error as long as the user has not requested the status of the indic
14. al mode rejection ratio 260dB 50 60Hz 0 5 dB Mode Precision 0 02dB 2digits display gt 38 7dBm Resolution 0 01dB above 18 of rating DC current Measurement ranges 500uA 5mA 50mA 500mA 10A Resolution 10nA 100nA 1uA 10uA 1MA Accuracy 0 5 500mA 0 2 rdg 0 004 fs 10A 0 3 rdg 0 004 fs AC voltages Measurement ranges 500mvV 5V 50V 500V 750V Resolution 10V 100mV 1mV 10mV 100mV Accuracy 0 5 50V at 40Hz 5kHz at 20Hz 20kHz 500V und 750V at 40Hz 1kHz at 20Hz 1kHz Max input voltage 0 4 v M 0 07 v E 1 v M 0 07 v E 0 4 v M 0 07 v E 1 v M 0 07 v E for 50V 500V and 1000V ranges 1000Vs for 500mV and 5V ranges 300V ert Input impedance AC mode 1MQ 90pF AC DC mode 10MQ 90pF Bandwidth at 3dB 80kHz typical dB Mode 20Hz 20kHz Accuracy 23 8dBm to 59 8dBm 0 2 dBm CMRR 260dB 50 60Hz 0 5 Peak factor 7 max AC current Measurement ranges 500 pA 5 mA 50 mA 500 mA 10 A Resolution 10nA 100nA 1uA 10uA IMA Accuracy 0 5 500mA 40Hz 5kHz 0 7 rdg 0 07 fs 10A 1 rdg 0 07 fs AC DC measurements Same as AC 25 digits Resistances Measurement range 500 Q 5 kQ 50 kQ 500 kQ 5 MQ 50 MQ Resolution 10M2 100M2 1Q 102 1009 1kQ Accuracy 0 05 rdg 0 004 fs 50mQ ranges 5mQ and 50MQ 0 3 rdg 0 004 fs Input protected to max 300Vrms Temperatures 2 wires resistance
15. ator through this command the latter will b AC voltage ranges remain set even if other commands go FREE through without errors No Range Reference Displaylimits 23 C 1 500 mV 1250 mV 1 248 65 251 35 2 247 15 252 85 2 5V 2 5V 1 2 4865 2 5135 2 2 4715 2 5285 3 50V 25V 1 24 865 25 135 2 24 715 25 285 4 500V 250 V 3 248 65 251 35 4 247 15 252 85 5 750V 700 V 3 692 4 7075 4 692 4 7075 1 50Hzto10kHz 2 20 Hz to 20 kHz 3 50 Hz to 1 kHz 4 20 Hz to 1 kHz 32 Subject change without notice c DC current ranges No Range Reference Display limits 23 C 1 500uA 250 00uA 249 48 250 52 2 5mA 2 5000mA 2 4948 2 5052 3 50mA 25 000mA 24 948 25 052 4 500mA 250 00mA 249 48 250 52 5 10A 1 800A 1 794 1 806 d AC current ranges f 400 Hz No Range Reference Display limits 23 C 1 500uA 250 00uA 247 9 252 1 2 5mA 2 5000mA 2 479 2 521 3 50mA 25 000mA 24 79 25 21 4 500mA 250 00mA 247 9 252 1 5 10A 1 800A 1 775 1 825 e Resistor ranges No Range Reference Display limits 23 C 1 500Q 200 002 199 88 200 12 2 5kQ 2 0000kQ 1 9989 2 0011 3 50kQ 20 000kQ2 19 989 20 011 4 500kQ 200 00kQ 199 89 200 11 5 5MQ 2 0000MQ 1 9939 2 0061 6 50MQ 20 000MQ 19 939 20 061 Calibration Calibration of the HM 8
16. e executed since the measurement is made in a single range for this function or if it is impossible to change ranges the instrument will send a beep In addition the command error indicator is then set see command E Display type commands These correspond to the choice of the HOLD OFFSET key on the front panel HD lt CR gt switches the instrument to HOLD O1 lt CR gt switches the instrument to OFFSET Single O0 lt CR gt switches the instrument to NORMAL LO lt CR gt locks the front panel In this case pressing a front panel key will cause the rtEOn message to appear L1 lt CR gt is away of unlocking the front panel The NORMAL type corresponds to a display without a reference OFFSET and without maintaining HOLD the front panel state In the same way as for the manual control it is impossible to switch to the OFFSET mode without first going to the HOLD mode Indeed the maintained measurement is used as a reference The possible steps are therefore NORMAL HD gt HOLD 01 gt OFFSET HD gt OFFSET HOLD 00 gt NORMAL Unlike the manual command it is possible to return directly to the NORMAL mode at any time during command O0 Status commands The status commands are used for recovering the status of the instrument The returned information consists of ASCII character strings each terminating ina lt CR gt 1 lt CR gt Request for equipment identification which returns HAMEG HM80
17. e test TC lt CR gt temperature measurement in C TF lt CR gt temperature measurement in F DB lt CR gt measurement in dB For these commands there is no error recovery provided for because it is normally possible to put the instrument in one of these states at any time Mode commands Mode commands correspond to the MODE key on the front panel DC lt CR gt switches the instrument to the DC measuring mode AC lt CR gt switches the instrument to the AC measuring mode AD lt CR gt switches the instrument to the AC DC measuring mode BY lt CR gt activates the continuity test beep DN lt CR gt deactivates the continuity test beep If the requested mode is not compatible with the current function e g sending the AC command while the instrument is measuring resistances the instrument will indicate this by a beep in the same way as for the front panel control In addition the control error indicator is set see command E7 Range modification commands These correspond to the RANGE keys on the front panel AY lt CR gt switches to automatic range change AN lt CR gt switches to manual range change R lt CR gt switches to the next higher range R lt CR gt switches to the next lower range 30 Subject change without notice If it is impossible to activate or deactivate the autoranging the current function e g following the AM command to switch to current measurement the AY command cannot b
18. he COM erminal shall be connected directly to ground or o the point of the measurement circuit having the owest potential The 0 5 V and 5 V voltage measurement ranges are protected from input voltages to 300 V rms all the other ranges are protected to 1000V DC During measurements on circuits using inductive components inadmissible high voltages may appear when the circuit is opened In such cases ake steps to prevent the destruction of HM8012 by inductive voltages Input impedance in the DC range To make the most of the excellent linearity of the measurement system the input impedance for voltage measurements is very high for some ranges For instance this makes possible to perform accurate measurements on ranges of up o 5V even when the internal impedance of the source to be measured is high For instance for he 500mV range an internal 5MQ source resistance will induce a maximum error of 150uV Indeed switching to the 50V range will cause the input voltage to drop because of the input impedance of 10 MQ which can cause the multimeter to switch to the lower range and so on After some swings the instrument goes into ANUAL mode Current measurement For current measurements the connection of the object to be measured is made across the mA uA terminal or to the A terminal for currents of up to 10 A The HM8012 should be connected to the circuit whose potential with respect to ground is lowest For safety reasons the
19. is automatically compensated On starting simultaneously pressing BEEP and OFFSET will eliminate probe cable resistance compensation zero value In all cases com pensation can be carried out by setting the probe to a temperature of 0 C and using the OFFSET function Note Measurement of the temperature probe line resistance should be made on the same instrument used for temperature measurements Only this procedure guarantees the specified measurement error Decibel measurements Choose the decibel measurement function using W 18 or A 19 key For decibel measurements the unknown input voltage is connected between the COM terminal and the V Q T dB terminal The HM8012 is used for DC or AC voltage measurements in decibels The 0 dB reference is defined for 1mW power in a 600 Q load i e a voltage of 0 7746V The scale extends from 78 dBm to 59 8dBm In a 50Q system the reference voltage for 1mW power is 0 2236V In a 75Q system the reference voltage for 1mW power is 0 2739V If decibel measurements are made on a 50Q system add 10 8dB to the displayed value If decibel measurements are made ona 75Q system add 9dB to the displayed value The mathematical relationship is as follows ae V Y avR R 10 gt dB 20109 pp R Reference resistance in Q Po 1mQ Vo in V Sign consideration A displayed value of 12dB is equivalent in 50Q to 12dB 10 8dB 1 2dB Equipment remote control HM8012 includes a front pane
20. ithout the BEEP 3 pushbutton will display the value resulting from the preceding calibration in case it is correct no recalibration will be necessary Pressing AUTO 15 again will return the instrument to the menu Pressing either or gt the next or the last calibration step will be accessed For precise resistance calibration it is necessary to connect the calibration resistors as closely to the input terminals as possible u Pressing the AC DC 17 pushbutton will store the calibrated values Subject change without notice 33 Listing of calibration steps Step Indication 1 u 05V Input 500 00 mV 5 0000 V 5 0000 V 500 0 V 1000 0 V 1000 0 V OV short circuit OV short circuit 0 25Veff 500Hz 5 kQ 50 kQ 500 kQ 5 MQ 0 Q with cords 0 E fe ESEE EE 0J Wait for complete stabilization of the display Calibration of frequency compensation While observing the necessary safety precautions open the instrument Select the 50 V AC range Apply 25 V AC 15 kHz Adjust the capacitor CV1 until the display reads 25 000 5 digits WDM8012 SOFTWARE ACD ROM is provided with the HM8012 multimeter including the user manual the WDM8012 software running under Windows as well as an application software running under Excel Wdm8012 HM8012 mutimeter control pane FUNCTION Measurement value 115 72 mV MOD
21. ive Note that the range numbers correspond respectively to 1 gt 0 5V 0 5kQ 500 pA T C T F 2 gt 5V 5kQ 5 mA Diode 3 gt 50V 50 kQ 50 mA 4 gt 500V 500 kQ 500 mA 5 gt 1000 V 5 MQ 6 gt 50 MQ 10 A Subject change without notice 31 P lt CR gt This command alone is used for recovering complete parameter settings of the equipment The instrument returns string_F string_M string_R string_D lt CR gt FUNCTION TEST This test should help verify at certain intervals the functions of HM8012 without any great expenditure in measurement instruments To achieve thermal balance the module and the basic instrument in its case must be energized for at least 60 minutes string_F is one of the responses returned by before the test begins command F string M is one of the responses returned by Measurement equipment used command M Fluke 5101B Fluke 5700A Rotek 600 AC DC string_R is one of the responses returned by calibrator command R Resistors of 5 kQ 50 kQ 500 kQ 0 01 for instance string_D is one of the responses returned by model S102 J by Vishay command D Resistors 500 kQ 5 MQ 0 02 for instance models CNS020 by Vishay S lt CR gt Request to send current measure ment The instrument returns a string Test procedure in the shape If one of the indicated calibrators is available or if NUM U
22. keys are used for switching between the various measurement ranges The measurement ranges are split into decades After each range change a code appears indicating the new range being used This code is in LX form where X is a value that may vary from 1 to 6 depending on the range and function and L1 is the lowest range During measurements of unknown voltages or currents first choose the highest measurement ange then switch to the range giving the most favorable display Change to the higher range is obtained when the value exceeds 51 000 counts Change to the lower ange is obtained when the value drops below 4 900 counts It is possible to know which range has been selected by the unit by temporarily deactivating the AUTO mode so that the range indication code appears fleetingly Measurement value display Measurement values are represented by 7 segment LED s display associated with one LED for the negative sign The maximum value of the 1st digit is 5 this corresponds to a 4 3 4 digit display with a 50 000 counts measurement capacity A minus sign appears in front of the figures when during DC measurements the positive polarity of the measured value is on the COM terminal With the inputs short circuited the display indicates depending on the measurement range value zero 2 digit When the range is overrun the display shows OFL and an audible beep is emitted repeatedly if it is selected For the resistance measureme
23. l be heard and the input relay will open to prevent any damage to the equipment The OFF message will be displayed Resetting is by pressing the sort key Changing fuse to repair HM8012 after an overload in a current range the fuse needs to be replaced To do this open the unit because the fuse can only be reached from the inside In any case only a fuse of the indicated type may be used otherwise HM8012 could sustain damage and the technical characteristics of the current measurement ranges would no longer be maintained Characteristics of fuse 500 mA fast blow 250V Crest factor To evaluate complex or deformed signals the determination of a true rms value is necessary The HM8012 digital multimeter will allow the measurement of AC quantities with a display of the true AC or AC DC value The crest factor is important data for interpreting measurement values and for evaluating its accuracy It is defined as the ratio between the peak voltage and the rms value of the signal Crest factor CF Up Ueff It is a measurement of the dynamic input voltage range of the AC converter and expresses the capability of processing measurement signals with a high peak value without the converter entering into saturation The HM8012 crest factor ranges from 1 to 7 for additional measurement error of lt 1 and depends on the magnitude of the rms value of the signal to be measured Figure 1 gives an additional error depending on the crest
24. l connector 13 for controlling the equipment by means of a point to point serial link There are three wires used RxD Receive Data TxD Transmit data SGnd Signal Ground The signal voltage levels must comply with the following levels 15 V max 3V min The link is of the bi directional asynchronous type with a fixed configuration 4800 Baud 8 bits no parity one stop bit The synchronization protocol is XON XOFF half duplex and is also fixed Each control must have two ASCII code characters followed by character 13 symbolized as lt CR gt in ASCII or two characters 13 and 10 symbolized as lt CR gt lt LF gt in ASCII while the lt LF gt character is ignored during reception The instrument internal buffer includes only three characters and there is no way of sending more than one command at a time On reception of terminator lt CR gt the equipment sends the character 19 lt DC3 gt ASCII to indicate that the dialogue is suspended As soon as it is possible to resume dialogue the instrument sends character 17 lt DC1 gt ASCII The commands are divided into five groups E Function commands These commands are used for choosing another magnitude to be measured and corresponding to the choice of FUNCTION key on the front panel VO lt CR gt voltage measurement VOLT AM lt CR gt current measurement A MA lt CR gt current measurement mA OH lt CR gt resistance measurement DI lt CR gt diod
25. may occur ifthe instrument has visible damage if the instrument has loose parts m if the instrument does not function after long storage under unfavourable circumstances e g outdoors or in moist environments Symbols as Marked on Equipment A ATTENTION refer to manual N DANGER High voltage Protective ground earth terminal Operating conditions The ambient temperature range during operation should be between 10 C and 40 C and should not exceed 40 C or 70 C during transport or storage The operational position is optional however the ventilation holes on the HM8001 and on the plug in modules must not be obstructed Warranty HAMEG warrants to its customers that the products it manufactures and sells will be free rom defects in materials and workmanship for a period of two years This warranty shall not apply o any defect failure or damage caused by improper use or inadequate maintenance and care HAMEG shall not be obliged to provide service under this warranty to repair damage resulting rom attempts by personnel other than HAMEG representatives to install repair service or modify hese products In order to obtain service under this warranty customers have to contact and notify their distributor Each instrument is subjected to a quality test with ten hour burn in before leaving the factory Practically all early failures are detected by this method In the case of shipments by post rail o
26. measurement with linearization for Pt 100 sensors as per standard EN60751 Range 200 C to 500 C Resolution 0 1 C Measurement current approximately 1 mA Display NIC Accuracy 0 1 C from 200 C to 200 C 0 2 C from 200 C to 500 C except for sensor tolerance Temperature coefficient Reference 23 C V 500mV 50V 30ppm C 1000V range 80ppm C other ranges 20ppm C V 750V range 80ppm C other ranges 50ppm C mA all ranges 200ppm C mA all ranges 300ppm C Q 5 MQ 50 MQ ranges 200ppm C other ranges 50ppm C Measurement current for resistance measurement 500Q 5kQ range 1mA 50kQ range 100uA 500kQ range 10A 5 50MQ range 100nA Measurement voltage for resistance measurement 10 V typical for open inputs depending on value of resis tance to be measured Negative polarity of measurement voltage is across common terminal Voltage drop for current measurements 10A range 0 2 V max 500mA range 2 5V max Other ranges 0 7 V max 10 C to 40 C max relative humidity 80 Power supply only HM 8012 5V 300mA 26V 140 mA Size L x H x D 135 x 68 x 228 mm without flat 22 pole connector Weight approx 500g Operating conditions 1 rdg reading 2 fs full scale Subject change without notice 23 General information The operator should not neglect to carefully read he following instructions and those of the mainframe HM8001 to avoid any operating errors
27. n the measurement path will distort the result It is preferable to remove if necessary any components connected to the semiconductor for precise results It is possible to measure voltages up to 5V The maximum voltage that the equipment will supply is 10 V in an open circuit If the cathode of the DUT is connected to the ground COM terminal the diode operates in its conducting mode If the anode of the DUT is connected to ground the diode operates in its reverse mode For measurements on Zenerdiodes the anode of the device should be connected to ground Take care when making measurements on sensitive circuits The current supplied by HM8012 is 1 mA constant for this function All keys except AW and HOLD OFFSET are inactive for this function Temperature measurements Choose the temperature measurement function C or F using W 18 or A 19 key The temperature probe is connected between the COM terminal and the V Q T dB terminal The temperature probe is connected between the COM terminal and the V Q T dB terminal Temperature measurement requires a temperature probe type Pt100 as per standard EN60751 The use of another probe is possible but can generate additional errors due to a different link cable resistance All keys except A W and HOLD OFFSET are inactive for this function Subject change without notice 29 After the instrument has been turned on the line resistance value of the temperature probe
28. nt function the exceeding of the capacity gt 50MQ generates the OPEN message If the multimeter is not connected to a circuit the display indicates random values due to the very high input impedance for ranges of 500mV and 5V Measurement inputs HM8012 has four safety terminals with which when using appropriate measurement cables e g HZ15 spurios measurements are totally ruled out As a safety measure the measurement cables should be checked periodically for insulation faults and when necessary be replaced The COM terminal black is common to all the measurement ranges The potential close to ground of all the measurement quantities should be applied to this terminal The input mA uA blue and A blue is intended only for current measurements whereas the input V Q T dB is designed for all other measurements Each terminal is appropriate to receive 4 mm banana plugs Subject change without notice 27 Voltage measurements The maximum input voltage of HM 8012 is 1000V DC when the COM terminal is to ground potential i e by connecting HM 8012 to the object to be measured the sum of the measurement voltage and that ofthe COM terminal with respect to ground shall not exceed 1000V DC In this case the maximum voltage value between the COM terminal and ground is 500V DC For AC voltages the true rms value of the input voltage willbe measured and the DC component eliminated in AC mode If possible t
29. ode is engaged pressing the A or Wkey will provoke return to the normal mode Further the manual mode is set on for HOLD and OFFSET functions 11 lt pushbutton Pushbutton for changing to lower range On each press the new range is displayed fleetingly on the display in code form L1 for lowest range L2 for second range etc 12 pushbutton Pushbutton for changing to higher range Each time pressed the new range will be displayed fleetingly on the display in code form L1 for lowest range L2 for second range etc 13 RS 232 DB9 Female DB9 connector intended for serial communication 14 AUTO LED Indicator signalling that the multimeter is in AUTOMATIC mode In this mode action on keys 12 and 13 is inoperative 15 AUTO pushbutton Pushbutton for switching the AUTO range selection to the MANUAL range selection and vice versa In MANUAL mode the choice of range is left to user initiative using the keys 12 and 13 26 Subject change without notice 16 Unit display zone LED This zone contains a display of the measurement units It also identifies the function selected by pressing the A 18 or W 19 key 17 AC DC pushbutton This key is used for selecting the measurement mode DC rms AC or rms AC DC Indicators below indicate the measurement mode DC measurement of DC voltages AC measurement of RMS AC voltages DC AC measurement of RMS AC DC voltages
30. oting validation of the audible continuity test signal When used as an Ohmmeter the audible signal triggers when the measured resistance value is less than 0 1 of the range or 50 counts For other functions the indicator is hidden 3 BEEP pushbutton Pushbutton for activating the audible signal 4 A 10A safety terminal for 4 mm banana plugs Connection high potential for DC and AC current measurements in the 10 A range in conjunction with the COM input 7 low potential The input is not fuse protected Current in excess of 10 A max 20 A must not be applied for a period exceeding 30 s otherwise the internal measurement resistor thermal device will blow 5 mA pA safety terminal for 4 mm banana plugs Connection high potential for DC and AC current measurements up to 500 mA in conjunction with COM 7 input low potential The input is fuse protected This input is opened when functions other than mA uA are being used Subject change without notice 25 4 DIGIT PROGAMMABLE MULTIMETER HM3012 HOLD OFFSET Instruments OS ww BOOBY 3 Baa AT 6 HOLD LED Indicator denoting that the displayed value has been frozen The function can be activated using key 10 Deactivation is by pressing the HOLD OFFSET key 7 COM safety terminal for 4 mm bana plugs The COM terminal low potential is the common connector for all the measurement functions to which the potential
31. r carrier it is recommended to preserve the original packing carefully Transport damages and damage due to gross negligence is not covered by warranty In the case of a complaint a label should be attached to the housing of the instrument that describes briefly the faults observed If at the same time the name and telephone number dialing code and telephone or direct number or department designation is stated for possible queries this helps towards speeding up the processing of warranty claims Maintenance Various important properties of the module should be checked carefully in certain intervals to ensure that all signals and measurement results are displayed with the accuracy on which the technical data are based When removing the case detach mains line cord and any other connected cables from case of the mainframe HM8001 Remove both screws on rear panel and holding case firmly in place pull chassis forward out of case When later replacing the case care should be taken to ensure that it properly fits under the edges of the front and rear frames After removal of the two screws at the rear of the 24 Subject change without notice module both chassis covers can be lifted When reclosing the module care should be taken that the guides engage correctly with the front chassis Operation of the module Provided that all hints given in the operating instructions of the HM8001 Mainframe were followed especially for
32. stance measurements connect the object to be measured between the COM terminal and the V Q T dB terminal There is a DC voltage across the connection terminals Accordingly only voltage free objects need to be measured because the voltages in the measurement circuit will distort the result In the case of low resistance mea surements the OFFSET key can be used to com pensate where applicable for measurement cord resistance For high resistance measurements it is advisable to place the resistance to be measured as close as possible to the measurement terminal or to use a shielded measurement cable connected to ground On startup simultaneously pressing MODE and OFFSET will eliminate the correction of the HZ15 measurement cord resistance Protection against overloads All the HM8012 measurement ranges are pro tected against various forms of overload Precise indications are given in the technical charac teristics In general during the measurement of unknown quantities always begin with the highest measurement range and from then on switch ranges using optimum display If HM8012 malfunctions first eradicate the cause before going on to make the following measurement If these safety limit values are exceeded i e 1000 Vpc or 750 Vrms the OFL message will be displayed and the associated audible signal will sound For an overrun exceeding 5 of the range 28 Subject change without notice a fast audible signal wil
33. ta lines of the instrument have much influence on emmission and immunity and therefore on meeting the acceptance limits For different applications the lines and or cables used may be different For measurement operation the following hints and conditions regarding emission and immunity should be observed 1 Data cables For the connection between instruments resp their interfaces and external devices computer printer etc sufficiently screened cables must be used Without a special instruction in the manual for a reduced cable length the maximum cable length of a dataline must be less than 3 meters If an interface has several connectors only one connector must have a connection to a cable Basically interconnections must have double screening For IEEE bus purposes the double screened cables HZ72S and HZ72L from HAMEG are suitable 2 Signal cables Basically test leads for signal interconnection between test point and instrument should be as short as possible Without instruction in the manual for a shorter length signal lines must be less than 3 meters long Signal lines must screened coaxial cable RG58 U A proper ground connection is required In combination with signal generators double screened cables RG223 U RG214 U must be used 3 Influence on measuring instruments Under the presence of strong high frequency electric or magnetic fields even with careful setup of the measuring equipment an influence of such signals
34. the selection of the correct mains voltage start of operation consists prac tically of inserting the module into the right or left opening of the mainframe The following pre cautions should be observed Before exchanging the module the mainframe must be switched off A small circle 0 is now revealed on the red power button in the front centre of the mainframe If the BNC sockets at the rear panel of the HM8001 unit were in use before the BNC cables should be disconnected from the basic unit for safety reasons Slide in the new module until the end position is reached Before being locked in place the cabinet of the instrument is not connected to the protective earth terminal banana plug above the mainframe multipoint connector In this case no test signal must be applied to the input terminals of the module HM 8012 Front panel commands 4 DIGIT PROGAMMABLE MULTIMETER HM3012 1 1 HAMEG Instruments OAS ww BOOBY 3 BUH Ta 1 DISPLAY 7 segment LED LED The digital display shows the measurement value with 4 3 4 digit resolution in which the largest figure is used up to 5 It will also display various warning messages The measurement value will be displayed with decimal points and polarity sign For DC measurement a minus sign will appear in front of the figures when the positive polarity of the measured value is connected to the COM input 7 2 LED Indicator den
Download Pdf Manuals
Related Search