Manual HM 8012_D_E_F_S.indd
Contents
1. and without maintaining HOLD the front panel state In the same way as or the manual control it is impossible to switch to he 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 00 Status commands The status commands are used for recovering the status of the instrument The returned infor mation consists of ASCII character strings each terminating in a lt CR gt 1 lt CR gt Request for equipment identification which returns HAMEG HM8012 V1 03 lt CR gt l e manufacturer instrument F lt CR gt M lt CR gt D lt CR gt R lt CR gt reference void and software version Firmware Requests current measurement function The instrument returns one of the following strings VOLT lt CR gt AMP lt CR gt AMP lt CR gt OHM lt CR gt DIODE lt CR gt TDGC lt CR gt TDGF lt CR gt DB lt CR gt Requests current measurement mode The instrument returns one he eight following strings AC BEEP ON lt CR gt AC BEEP OFF lt CR gt DC BEEP ON lt CR gt DC BEEP OFF lt CR gt AC DC BEEP ON lt CR gt AC DC BEEP OFF lt CR gt BEEP ON lt CR gt BEEP OFF lt CR gt The first six answers are obtained in voltage2. e g sending the AC command while the instrument is measuring resistances he instrument will indicate this by a beep in he same way as for the front panel control In addition the control error indicator is set see command E 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 30 Subject to change without notice R lt CR gt switches to the next higher range R lt CR gt switches to the next lower range f it is impossible to activate or deactivate the au oranging the current function e g following the AM command to switch to current measurement he AY command cannot be executed since the measurement is made in a single range for this unction or if it is impossible to change ranges he instrument will send a beep In addition the command error indicator is then set see com mand 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 01 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 LI lt CR gt is a way of unlocking the front panel The NORMAL type corresponds to a display with outa reference OFFSET
3. 10 A range Inputs on the A and COM connectors Resistors Inputs V Q T dB and COM con nectors Temperature in degrees Celsius Connection of probe to V Q T dB and COM connectors Temperature in degrees Fahrenheit Connec tion of probe to V Q T dB and COM connec tors Diode test Inputs on V Q T dB and COM connectors On each press the new function is indicated by a LED corresponding to the unit of the quantity to be measured It is possible to move from one func tion 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 Range selection In manual mode W 8 and A Q 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 range 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 range is obtained when the value drops below 4 900 counts It is possible to know which range has be
4. 4 4 5 5 6 0 05 0 15 03 04 0 5 Another factor influencing the measurement pre cision is the duty cycle of the measurement signal The crest factor in this relation becomes T gt t v 100 us t 0 CF vT t T period duration t pulse duration V pulse voltage 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 Y or A key For diode measurements connect the device under test DUT between the COM termi nal 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 in the measurement path will distort the result Itis preferable to remove if necessary any compo nents connected to the semiconductor for precise results It is possible to measure voltages up to 5 V 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 1mA constant for this functio
5. Resolution DC current Measurement ranges Resolution Accuracy 0 5 500mA 10A Voltage drop 10 A range 500 mA range other ranges 0 02dB 2 digits display gt 38 7 dBm 0 01 dB above 18 of fs 2 500pA 5mA 50mA 500mA 10A 10nA 100nA 1pA 10pA 1mA 0 2 of rdg 0 004 of fs 2I 0 3 of rdg 0 004 of fs 2 0 2 V max 2 5 V max 0 7 V max AC voltage Measurement ranges Resolution Accuracy 0 5 50V 40 Hz 5kHz 20Hz 20kHz 500V and 600V 40Hz 1kHz 20Hz 1kHz Overload protection V Q T dB against COM and to chassis Low against chassis Input impedance Bandwidth at 3dB dB Mode 500 mV 5V 50V 500V 600V 10uV 100pV 1mV 10mV 100mV 0 4 of rdg 0 07 of fs 2 1 of rdg 0 07 of fs 2 0 4 of rdg 0 07 of fs 2 1 of rdg 0 07 of fs 850 Vs at max 60 Hz or 600 Voc 250 Verf at max 60 Hz or 250 Voc Accuracy 23 8 59 8dBm 0 2dBm Resolution CMRR Crest factor AC mode 1MQII90pF AC DC mode 10MQII90pF 80kHz typical 20Hz 20kHz 0 01dB above 9mV 60dB 50 60 Hz 0 5 7 max AC current Measurement ranges Resolution Accuracy 500pA 5mA 50mA 500mA 10A 10nA 100nA 1pA 10pA 1mA Specifications 0 5 500mA 0 7 of rdg 0 07 of fs 2 for 40Hz 5kHz 10A 1 of rdg 0 07 of fs 2 AC DC measurements Same as AC 25 Digits Ranges 5
6. and current functions the ast ones in the others 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 ORMAL lt CR gt The REF string corresponds to the ront panel OFFSET mode The NOR AL string indicates that the display is neither on HOLD nor on REF Requests for current measurement range The instrument returns one of he following strings UM lt CR gt UM AUTO lt CR gt The first NUM field represents a di gital character indicating the current range number Where applicable a second field is displayed indicating that the automatic range change mode is active Note that the range numbers correspond respectively to P lt CR gt S lt CR gt E lt CR gt Remote control 1 gt 0 5 V 0 5kQ 500 pA T C T F 2 gt 5V 5kQ 5 mA Diode 3 gt 50 V 50 kQ 50 mA 4 gt 500 V 500 kQ 500 mA 5 gt 1000 V 5 MQ 6 gt 50 MQ 10 A This command alone is used for reco vering complete parameter settings of the equipment The instrument returns string_F string_M string_R string_D lt CR gt string_F is one of the responses returned by command F string_M is one of the responses returned by command M string_R is one of the responses returned by command R string_D is one of the responses returned by command D Request to send current measure ment The instrument retur
7. before starting the test The specified alignment procedure should be strictly observed When removing the case detach mains line cord and any other connected cables from case of the mainframe HM8001 2 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 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 2 Mainframe were followed especially for the selection of the cor rect mains voltage start of operation consists practically of inserting the module into the right or left opening of the mainframe The following precautions should be observed Important hints Before exchanging the module the mainframe must be switched off A small circle o 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 2 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
8. influence caused by the measurement signal Na Range Reference Display limits 23 C a DC voltage ranges 1 500 pA 250 00pA 247 9 252 1 2 5mA 2 5000 mA 2 479 2 521 No Range Reference Display limits 3 50mA 25 000mA_ 24 79 25 21 23 C 4 500mA 250 00mA 247 9 252 1 1 500mV_ 250 mV 249 85 250 15 5 10A 1 800A 1 775 1 825 2 SV 2 5V 2 4986 2 5014 3 50V 25 V 24 985 25 015 4 500v 250v 249 86 250 14 e Resistor ranges 5 600V 550 00 V 949 7 550 3 No Range Reference Display limits 23 C 1 5000 200 000 199 83 200 17 2 5kQ 2 0000 kQ 1 9989 2 0011 3 50kQ 20 000 kQ 19 989 20 011 4 500kQ 200 00 kQ 199 89 200 11 5 5MQ 2 0000MQ 1 9939 2 0061 6 50MQ 20 000MQ 19 393 20 061 32 Subject to change without notice WDM8012 SOFTWARE A CD ROM is provided with the HM8012 multi meter including the user manual the WDM8012 software running under Windows as well as an application software running under Excel 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 Wdm0012 HM8012 mutimeter contral panel Measurement value FUNCTION VOLT C de C DIODE 115 72 mV CAMP C mAMP r MODE r RANGE OHM
9. kQ 5M00 02 for instance models CNSO20 by Vishay Test procedure f one of the indicated calibrators is available or if precision calibrators are appropriate all the HM8012 measurements ranges can be checked using the following tables which indicate the limit values Recalibration however should only be performed if the appropriate precision calibrator is available Before any change of ranges ensure that the signal at HM8012 does not represent an unaccep table load of the object under examination For the link between the calibrator and HM8012 shielded cables must be used to prevent any unwanted b AC voltage ranges No Range Reference Display limits 23 C 1 500 mV 250 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 250V 3 248 65 251 35 4 247 15 252 85 5 600V 550V 3 547 3 552 6 4 544 0 555 9 1 40 Hz to 5 kHz 2 20 Hz to 20 kHz 3 40 Hz to 1 kHz 4 20 Hz to 1 kHz c DC current ranges No Range Reference Display limits 23 C 1 500 pA 250 00 pA 249 48 250 52 2 5mA 2 5000 mA 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
10. protective earth terminal banana plug above the mainframe mul tipoint connector In this case no test signal must be applied to the input terminals of the module Generally the HM8001 2 set must be turned on and in full operating condition before applying any test signal Ifa failure of the measuring equipment is detected no further measurements should be performed Before switching off the unit or exchanging a module the instrument must be disconnected from the test circuit Subject to change without notice Control Elements 4 DIGI q Pog L mA Control Elements DISPLAY 7 segment LED LED The digital display shows the measurement value with 4 digit resolution in which the largest fi gure 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 LED Indicator denoting validation of the audible con tinuity 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 d BEEP pushbutton Pushbutton for activating the audible signal A safety terminal for 4 mm banana plugs Connection high potential f
11. quantities should be applied to this terminal The input mA and A is intended only for current measurements whereas the input V Q T dB is designed for all other measurements Each terminalis appropri ate to receive 4 mm banana plugs Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Voltage measurements The maximum input voltage of HM8012 A 600Vpc when the COM terminal is to ground potential i e by connecting HM8012 to the object to be measured the sum of the measurement voltage and that of the COM terminal with respect to ground shall not exceed 600Vpc In this case the maximum voltage value between the COM terminal and ground is 250Vpc For AC voltages the true rms value of the input voltage will be measured and the DC component eliminated in AC mode If possible the COM ter minal shall be connected directly to ground or to the point of the measurement circuit having the lowest potential The 0 5 V and 5 V voltage measurement ranges are protected from input voltages to 300 Vrms all the other ranges are protected to 850 Vrms During measurements on circuits using inductive components inadmissible high voltages may appear when the circuit is opened In such cases take 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 he measurem
12. 002 5K 50kQ 500k 5M9 50MQ Resolution 10M0 100M0 19 100 1000 1kQ Accuracy 500 0 to 500 KQ 0 05 of rdg 0 004 of fs 2 50mQ 5MQ and 50 MQ 0 3 of rdg 0 004 of fs 2 Input protected to max 300 Vest Measurement current 5000 5k0 range mA 50kQ range 100 pA 500kQ range 10 pA 5 50MQ range 100 nA Measurement voltage 10V typical for open inputs depending on the value of resistance to be measured Negative polarity of measurement voltage is across common terminal 2 wire resistance measurement with linearization for PT100 sensors as per standard EN60751 Range 200 C to 500 C Resolution 0 1 C Measurement current ca 1 mA Display in C F Accuracy 200 C to 200 C 0 4 C 0 0005 xT 200 C to 500 C 0 5 C 0 0005 xT Tin C sensor tolerance not included Temperature coefficient Reference 23 C V 500 mV 50V 30ppm C 600V range 80ppm C other ranges 20ppm C V 600V range 80ppm C other ranges 50 ppm C mA all ranges 200ppm C mA allranges 300ppm C Q 5MQ 50MQ ranges 200ppm C other ranges 50ppm C Operating conditions 10 C to 40 C max rel humidity 80 without condensation Power supply from HM8001 2 5V 300 mA 26 V 140 mA Size Wx H x D 135 x 68 x 228 mm without flat 22 pole connector Weight ca 900g 1 rdg reading 3 Common mode rejection ratio 2 fs full scale Included in delivery HM8012 Multi
13. 1mW power in a 6000 load i e a voltage of 0 7746V The scale extends from 78dBm to 59 8dBm In a 50Q system the reference voltage for ImW power is 0 2236V In a 75Q system the reference voltage for 1mW power is 0 2739V If decibel measurements are made on a 500 system add 10 8dB to the displayed value If decibel measurements are made ona 7950 system add 9dB to the displayed value The mathematical relationship is as follows a V Y VAR 10 dB 2009 yee To R Reference resistance in Q Po 1 mW Vo in V Sign consideration A displayed value of 12dB is equivalent in 50Q to 12dB 10 8dB 1 2dB Remote control HM8012 includes a front panel connector 4 for controlling the equipment by means of a point to point serial link There are 3 wires used RxD Receive Data TxD Transmit data SGnd Signal Ground The signal voltage levels must comply with the following levels 15 V max 3 V 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
14. CTF cw oc Cacec FF AUTO l CAC EE Beep ag 2 r now M OFFSET F Locked WDM8012 Software 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 thres holds A DDE link is also possible which make easier the integration of the instrument in specific application software A software running under Excel allows auto matic drawings of curves with a programmable delay between successive measurement ranging from 1s to 65s 19110 2001 11 31 31 06 059 4 4 b 2 22 22 enn n ene ene eee eee eee eee 058 a 4e 4 f ea t4 054 St ne 16 21 26 3 G 41 4 4 E UE U 6 61 6 71 7 8 S91 Number of measurement Delay between 2 measurements 1s Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com
15. Test Equipment Depot 1 800 517 8431 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 WDM8012 Software incl delivery PVC Test Leads Mainframe HMs8001 2 i 4 Digit programmable Multimeter HM8012 LAAAAAAAAAPLLA LMM A LLZZAALAAEEE SLA SS oe ff fF A a mA Viarrerani ie A RS 232 0060 S gah HAMEG Vems manor mex Stma i lt 4 ma DOV pk gt instr 4 digit display with 50 000 counts Basic accuracy 0 05 Automatic and manual range selection Max resolution 10yV 0 01dBm 10nA 10mQ 0 1 C F Offset function relative value measurement in basicmeasurement functions Input impedance gt 1GQ 0 5V and 5V DC range RS 232 interface PC software for control and data logging Mainframe HM8001 2 required for operation fo inklusivej SPECIFICATIONS valid at 23 deg C after a 30 minute warm up period DC voltages Measurement ranges Resolution Accuracy 5V 500V 600V 500mV 50V Overload protection 500 mV 5V 50V 500V 600V 10V 100pV 1mV 10mV 100mV 0 05 of rdg 0 002 of fs 2 0 05 of rdg 0 004 of fs 2 W Q T dB against COM and to chassis Low against chassis Input resistance 50V 500V 600V 500mV 5V Input current dB Mode 850 Vp at max 60 Hz or 600 Voc 250 Vrms at max 60 Hz or 250 Voc TOMQU90 pF gt 1GQ1190 pF 10A 2100dB 50 60Hz 0 5 60dB 50 60 Hz 0 5 Accuracy
16. W Q T dB t 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 safety terminal For safety reasons the voltage across this terminal compared to the case guard wire ground shall be 600 Vonc at most HOLD OFFSET pushbutton Pushbutton for validating the HOLD or OFFSET unctions Pressing the key the first time will reeze the front panel display The HOLD indicator then comes on The AUTO AC DC BEEP lt and gt Q 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 comes on A third press will freeze the relative value The HOLD and OFFSET indicators come on A fourth press will delete the HOLD and OFFSET mode lt 4 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 P 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 RS 232 DB9 Female DB9 connector intended for serial com munication AUTO LED Indicator signalling that the multimet
17. e 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 Vp Vrs It is a measurement of the dynamic input voltage range of the AC converter and expresses the ca pability of processing measurement signals with a high peak value without the converter entering into saturation 23 Subject to change without notice The HM8012 crest factor ranges from 1 to 7 for additional measurement error of lt 1 and de pends on the magnitude of the rms value of the signal to be measured 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 850 Vp At the middle of the measurement range the maximum crest factor is 7 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 3dB bandwidth of the converter 1 0 al Hee 1 2 3 4 1 2 3 4 5 6 7 8 9 10 11 Additional error due to high crest factor j Error of reading CF 1 2 2 3 3
18. en 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 seg ment 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 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 re sistance measurement 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 500 mV and SV Measurement inputs The HM8012 has four safety terminals with which when using appropriate measurement cables e g HZ15 unintended contacts with the measurand are nearly impossible As a safety measure the measurement cables should be checked periodi cally for insulation faults and when necessary be replaced The COM terminal is common to all the measurement ranges The potential close to ground of all the measurement
19. ent system the input impedance or voltage measurements is very high 1GQ for some ranges For instance this makes possible o perform accurate measurements on ranges of up to 5V even when the internal impedance of he source to be measured is high For instance or the 500 mV range an internal 5 MQ source resi stance will induce a maximum error of 150uV ndeed switching to the 50V range will cause the in put voltage to drop because of the input impedance of 10MQ which can cause the multimeter to switch o the lower range and so on After some swings he instrument goes into MANUAL mode Current measurement For current measurements the connection of the object to be measured is made across the mA terminal or to the A terminal for currents of up Functions to 10 A The AUTO mode is inhibited because there is only one range The HM8012 should be connected to the circuit whose potential with respect to ground is lowest For safety reasons the COM terminal must not exceed 250Vpc with respect to ground Current ranges are protected by fuse against over loads If the fuse blows the cause of the overload must be eliminated In case of an open fuse the instrument has to be sent in for repair A change of the fuse by the customer Is not permitted 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 n
20. er is in AU TOMATIC mode In this mode action on keys lt and gt is inoperative Control Elements AUTO pushbutton Pushbutton for switching the AUTO range selec tion to the MANUAL range selection and vice versa In MANUAL mode the choice of range is left to user initiative using the keys 4 and PO Unit display zone LED This zone contains a display of the measurement units It also identifies the function selected by pressing the Y or A key 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 V pushbutton Pushbutton for selecting the next function A pushbutton Pushbutton for selecting the previous function On startup the unit switches automatically to the DC voltmeter MANUAL mode function and 600 voltrange Subject to change without notice Functions Functions Beginning in volt range V by using the keys Yv and A you can step through all the multi meter functions one by one in following order DCorAC voltages Input on the V Q T dB and COM connectors The measurement of DC or AC voltages in decibels reference 1mW 600Q Input to V Q T dB and COM connectors DC or AC current up to 500 mA Inputs on mA and COM connectors DCorAC current
21. lectrotechnical Commission IEC safety standards Warning Any interruption of the protective conductor inside or outside the instrument or discon nection of the protective earth terminal is likely to render the instrument dangerous Intentional interruption is prohibited 22 Subject to change without notice The istrument must be disconnected and secured against unintentional operation if there is any sug gestion that safe operation is not possible This may occur if the instrument shows visible damage ifthe instrument has loose parts ifthe instrument does not function after long storage under unfavourable circumstances e g outdoors or in moist environments after excessive transportation stress e g in poor packaging When removing or replacing the metal case the instrument must be completely disconnected from the mains supply If any measurement or calibration procedures are necessary on the opened up instrument these must only be carried out by qualified personnel acquainted with the danger involved Symbols marked on equipment A ATTENTION refer to manual A 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 ho wever the ventilation holes on the HM8001 2 and
22. meter Manu al HZ14 Interface cable HZ15 PVC Test Leads Software CD Accessories HZ10 Silicone Test Leads HZ812 PT100 Temperature Sensor Subject to change without notice Important hints Important hints The operator is requested to carefully read the following instructions and those of the mainfra me HM8001 2 to avoid any operating errors and mistakes and in order to solo O OFZO Q become aquainted with the module After unpacking the module check for any me chanical damage or loose parts inside Should there be any transportation damage inform the supplier immediately and do not put the module into operation This plug in module is primarily intended for use in conjunction with the Mainfra me HM8001 2 When incorporating it into other systems the module should only be operated with the specified supply voltages Safety This instrument has been designed and tested in accordance with IEC Publication 1010 1 Safety requirements for electrical equipment for measu rement control and laboratory use It corre sponds as well to the 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 instrument s power cable must be plugged into an approved three contact electrical outlet which meets International E
23. n All keys except V A and HOLD OFFSET Q are inactive for this function Temperature measurements Choose the temperature measurement function C or F using Y A key The temperature probe is connected between the COM terminal and the V Q T dB terminal Temperature measurement requires a tempera ure 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 Y 8 A 9 and HOLD OFFSET Q are inactive for this function After the instrument has been turned on the ine resistance value of the temperature probe is automatically compensated On starting simultaneously pressing BEEP and OFFSET will eliminate probe cable resi stance compensation zero value In all cases compensation 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 in strument used for temperature measurements Only this procedure guarantees the specified measurement error Remote control Decibel measurements Choose the decibel measurement function using V A 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 0dB reference is defined for
24. no way of sending 29 Subject to change without notice Remote control 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 soonas it is possible to resume dialogue the instrument sends character 17 lt DC1 gt ASCII The commands are divided into five groups Function commands These commands are used for choosing another magnitude to be measured and corresponding to he choice of FUNCTION key on the front panel VO lt CR gt voltage measurement VOLT AM lt CR gt current measurement A A lt CR gt current measurement mA OH lt CR gt resistance measurement DI lt CR gt diode 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 he 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 BN lt CR gt deactivates the continuity test beep f the requested mode is not compatible with the current function
25. ns a string in the shape NUM UNIT lt CR gt NUM represents the digital value ield in IEEE NR2 format in our case ive significant digits at most with he presence of a decimal point The significant digits are those of the front panel display UNIT is the field giving as suggested by the name the unit or a submul iple thereof The possible values are identical to that of the front panel Request for status of command error indicator The instrument returns O lt CR gt if the command or commands received previously have not gene rated an error 1 lt CR gt if one of the com mands received previously has generated an error The use of this command resets the error indicator to 0 Indeed in the event of an error as long as the user has not requested the status of the indicator through this command the latter will remain set even if other commands go through without er rors Subject to change without notice Function Test Function Test This test should help verify at certain intervals the functions of HM8012 without any great expen diture in measurement instruments To achieve thermal balance the module and the basic instru ment in its case must be energized for at least 60 minutes before the test begins Measurement equipment used Calibrator AC DC for instance Fluke 5101B Fluke 5700A Rotek 600 Resistors of 5 kQ 50 kQ 500 kQ 0 01 for instance model S102 J by Vishay Resistors 500
26. oise it is necessary to use a shielded cable Take into account the input impedance of the mul imeter Itis 1MQin the AC mode and 10MQin the AC DC mode In addition there is a slight measu rement difference between these two modes due o the input circuits If AC measurements without a DC component are to be made it is preferable o use the straight AC mode When the multimeter is used in AUTOMATIC mode here can be continuous swinging between two ranges for frequencies above 30kHz because of the frequency response difference of the two ranges After some swings the instrument goes into MANUAL mode Measuring errors can be caused by an overload of the measuring amplifiers and the A D converter For measurements of mixing tensions positive or negative DC voltage overlaid with an alternating voltage select a measuring range which is not exceeded by the peak value of the alternating voltage the largest deviation from the reference potential normally 0 V That applies also if only the DC voltage portion is to be measured A DC voltage of 350 mV is superimposed with a sine signal with an amplitude of 200 mV 400 MVpp The highest deviation from 0 V amounts 550 mV 350 mVp 200 mVp For DC and AC DC measurements the 5 V range must be selected AC measurements can be done in the 500 mV range because then a capacitor in the entrance suppresses the DC voltage It is reasonable first to determine the height of the possibly exis
27. on the plug in modules must not be obstructed Warranty and Repair HAMEG instruments are subjected to a strict qua lity control Prior to leaving the factory each ins trument is burnt in for 10 hours By intermittent operation during this period almost all defects are detected Following the burn in each instrument is tested for function and quality the specifications are checked in all operating modes the test gear is calibrated to national standards The warranty standards applicable are those of the country in which the instrument was sold Reclamations should be directed to the dealer Only valid in EU countries In order to speed reclamations customers in EU countries may also contact HAMEG directly Also after the warranty expired the HAMEG service will be at your disposal for any repairs Return material authorization RMA Prior to returning an instrument to HAMEG ask fora RMA number either by internet http www hameg com or fax If you do not have an original shipping carton you may obtain one by calling the HAMEG sales dept 49 6182 800 300 or by sending an email to vertrieb hameg com Maintenance The most important characteristics of the instru ments should be periodically checked according to the instructions provided in the sections Opera tional check and Alignment procedcure To obtain the normal operating temperature the mainframe with inserted module should be turned on at least 60 minutes
28. or DC and AC current measurements in the 10 A range in con junction with the COM input low potential 24 Subject to change without notice HOLD OFFSET H PROGRAMMABLE MULTIMETER HM8012 DA A mm y lt jrance gt 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 mA safety terminal for 4 mm banana plugs Connection high potential for DC and AC current measurements up to 500 mA in conjunction with COM input low potential The input is fuse protected HOLD LED Indicator denoting that the displayed value has been frozen The function can be activated using key Deactivation is by pressing the HOLD OFFSET key 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 close to the ground of the measured quantity will be applied For safety reasons the voltage across this terminal compared to the case guard wire ground shall be 250 V at most OFFSET LED ndicator denoting that the displayed value is a relative measurement The displayed value cor responds to the input value less the value present on the display during initial action on the HOLD OFFSET key Activate this function by means of a second press on the HOLD OFFSET key V
29. ting alternating voltage with AC measurement Then switch to DC or AC DC function and consider the 27 Subject to change without notice Functions alternating voltage height with the measuring range choice Resistance measurements For resistance 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 lowresistance measurements the OFFSET key canbe used to compensate where applicable for measurement cord resistance For high resistance measurements it is ad visable 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 Protection against overloads All the HM8012 measurement ranges are pro ected against various forms of overload Precise indications are given in the technical charac eristics n general during the measurement of unknown quantities always begin with the highest mea surement range and from then on switch ranges using optimum display If HM8012 malfunctions irst eradicate the cause before going on to make he following measurement Crest factor To evaluate complex or deformed signals the determination of a true rms value is necessary Th
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