Model 703 Model 701
Contents
1. AC Voltage Accuracy Range Reston r CE ESE A ES 400 mV Cali ETAN a 0 75 3 0 75 3 2 0 3 Ea 40 V oo iv io ass ST CMRR gt 600B DC to 60 Hz Rs 1 KQ Input Impedance 10 MQ 30 pF nominal 50 MQ 100 pF nominal for 400 mV range 1 Accuracy for 400 Hz to 1 kHz 22 DC Current Accuracy Range E Resolution Accuracy g 700 703 400 pA 0 1 pA 4000 pA 1 0 2 1 0 2 wma tO Coa Ue PTS AC Current Accuracy Range Resolution aes 4000 pA 1 A 9 ae 400 mA a im 15 10 15 10 2 0 10 i 1 0 5 10 5 Resistance oers 10 3 05 3 05 3 me C TE Bno ITA Open Circuit Voltage lt 1 3 V dc 23 Continuity Audible threshold the beeper sounds if the measured resistance is lower than 109 and turns off when greater than about 60 Q Response time lt 1 msec Diode Test Capacitance Resolution AeUraey GF ine ES 25 4 10 Accuracy with film capacitor or better Using A_Mode Frequency and Duty Cycle resa Por ange a cas QUI 0 01 Hz Minimum frequenc INI Fz oe 1 Z e E Linee I 0 05 3 Hz 0 KAZ 10 Hz Sensitivity 5 Hz 1 MHz gt 250 mV 1 MHz 10MHz gt 350 mV 500 kHz 100 Hz 10 MHz 10 kHz 0 1 to 0 1 0 5 Hz to 500 kHz pulse width gt 2 usec 99 9 ae 0 1 0 05 per kHz 1 count for 5 V input Logic signals only 24 Temperature Model2. VOLTAGE when the rotary switch is set to Q OF s or MH functions 10 11 400 0 Q 4 000 KQ 40 00 KQ 400 0 kQ 4 MQ and 40 MQ Diode ile Test Caution Discharge all high voltage capacitors before testing diodes Large value capacitors should be discharged through an appropriate resistance load Use the diode test to check diodes transistors silicon controlled rectifiers SCRs and other semiconductor devices The test sends a current through a semiconductor junction then measures the junction s voltage drop PARALLEL CONNECTION Normal forward voltage drop forward biased for a good silicon diode is between 0 4 V to 0 9 V A reading higher than that indicates a leaky defective diode A zero reading indicates a shorted defective diode An BL indicates an open diode defective Reverse the test leads connections reverse biased across the diode The display shows BL if the diode is good Any other readings indicate the diode is shorted or resistive defective Continuity 5A Test The continuity function detects intermittent opens and shorts lasting as little as 1 millisecond These brief contacts cause the meter to emit a short beep This function is convenient for checking wiring connections and operation of switches A continuous beep tone indicates a complete wire 12 Caution Using resistance and continuity function in a live circuit will produce false results and may damage the instrumen
3. illustrations and examples assume use of Model 703 711 TALE A BLA TMETER 1000 CAT III 1 3 3 4 digit 4000 count LCD display 2 Push buttons for special functions amp features 3 Selector to turn the power ON or OFF and select a function 4 Input terminal for 10A 20A for 30 sec current measurement function 5 Input terminal for milli amps and micro amps current measurement function 6 Common Ground reference input terminal for all measurement functions 7 Input terminal for all functions EXCEPT current A mA pA measurement functions Glossary of Terms for Digital Multimeters Average sensing RMS calibrated RMS Root Mean Square is the term used to describe the effective or equivalent DC value of an AC signal Most digital multimeters use average sensing RMS calibrated technique to measure RMS values of AC signals This technique is to obtain the average value by rectifying and filtering the AC signal The average value is then scaled upward that is calibrated to read the RMS value of a sine wave In measuring pure sinusoidal waveform this technique is fast accurate and cost effective However in measuring non sinusoidal waveforms significant errors can be introduced because of different scaling factors relating average to RMS values True RMS True RMS is a term which identifies a DMM that accurately responds to the effective RMS value regardless of the waveform shapes such as square sawtooth trian
4. 703 only 40 C to 10 C 3 5 C 40 F to 14 F 3 5 F 400 C to 1300 C 3 of reading 752 F to 2372 F 3 of reading 1 C 1 10 C to 400 C 1 C 1 3 14 F to 752 F 1F 1 3F 1 C 1F This specification is effective at the ambient temperature of 23 C 73 4 F only Frequency Counter Sensitivity Minimum Sensitivity RMS Sine Wave 40 Hz to 10 kHz 40 Hz to 20 kHz V 4 V to 1000 V 500 mV 500 mV 400 p la de 4 mA gt 15 F S of AC range Not Specified 40 mA T mA gt 15 F S of AC range Not Specified 4 0 A 10 A gt 45 F S of AC range Not Specified Burden Voltage A mA pA 150 uV pA 150 uV yA 3 3 mV MA 3 3 mV mA 25
5. AFETY INFORMATION This manual contains information and warnings that must be followed for operating the meter safely and maintaining the meter in a safe operating condition If the meter is not used in a manner specified in this manual the protection provided by the meter may be impaired The Model 703 and Model 701 comply with IEC 1010 1 1995 UL 3111 1 6 1994 EN 61010 1 1995 CSA C 22 2 No 1010 1 92 Overvoltage 1000V Category Ill TERMS IN THIS MANUAL A Warning identifies conditions and actions that could pose serious hazards to the user A Caution identifies conditions and actions that could cause damage the meter or the equipment under test Warning Do not expose the meter to rain or moisture in order to reduce the risk of fire or electric shock To avoid any electrical shock hazard observe the proper safety precautions when working with voltages above 60 V dc or 30V ac rms these voltage levels pose a potential shock hazard to the user Inspect test leads connectors and probes for damaged insulation or exposed metal before using the meter If any defects are found replace them immediately Do not touch test lead tips or the circuit being tested while power is applied to the circuit under test Always keep your fingers behind the finger guards of the test leads during measurement Do not measure any circuit that draws more than the protection fuse s current rating Do not attempt the protection fuse s voltage rating Neve
6. C 50Hz and 60Hz in DC volts measurement function Burden Voltage Burden voltage is a voltage drop across the input terminals of a current measuring device caused by internal shunt resistance Burden voltage contributes measurement error and should be as low as practical Temperature Coefficient Temperature Coefficientis a factor used to calculate the change in indication or output of an instrument with changes in temperature Uncompensated changes in temperature contribute uncertainty by an amount determined by the temperature coefficient to instrument 4 ROTARY SWITCH AND PUSHBUTTON OVERVIEW Turning the Meter On To turn the meter on turn the rotary switch from OFF to any switch setting Rotary Switch Turn the meter on by selecting any measurement function The meter presents a standard display for that function range measurement units etc Use the SELECT button to select any rotary switch alternate function When you turn the rotary switch from one function to another a display for the new function appears Button choices made in one function do not carry over into another function OFF Turns the meter off Y Model 703 Volts ac rms and Volts dc Y Model 701 Volts ac H vy Model 701 Volts dc Q Access to resistance measurement continuity test and diode test Hz Duty Frequency measurement Duty cycle is also displayed if it is toggled by the Hz Duty button CAP Capacitance meas
7. Duty N DA m and se 104 HOLD Press this button to turn hold mode ON and OFF When the hold mode is activated the meter beeps freezes the display and displays the D H indicator on the LCD HOLD mode freezes the display for later view 3 Backlight Press the HOLD 3 button for two seconds to tum the backlight ON or OFF when the HOLD function is simultaneously activated with the D H symbol on the display Press the HOLD button momentarily again to activate the Backlight function only SELECT Press this button to toggle between the dc measurement mode and the ac meseurement mode when the rotary selector switch is set to Vv Model 703 only JA A ind 104 And also press this button to cycle throug se OF rin OY e MeasticiieNt Mode wen the rotary selector switch is set to Q ag 5 METER OPERATION Voltage or Y Measurements Voltage is the difference in electrical potential between two points The polarity of ac alternating current voltage varies over time while the polarity of de direct current voltage is constant over time Y function defaults at de Press SELECT button momentarily to select ac Range available in volts functions are 400 mV 4 V 40 V 400 V and 1000V When measuring voltage the meter acts like a 10MQ 10 x 100 impedance in parallel with the circuit This loading effect can cause measurement errors in high impedance circuits In most cases the error is negligible 0 1 or less if
8. MAFAsSURING EQGUIEMENT Model 703 True RMS Multimeter Model 701 Multimeter User s Manual MN Ne WARNING SOURCES LIKE SMALL HAND HELD RADIO TRANSCEIVERS FIXED STATION RADIO AND TELEVISION TRANSMITTERS VEHICLE RADIO TRANSMITTERS AND CELLULAR PHONES GENERATE ELECTROMAGNETIC RADIATION THAT MAY INDUCE VOLTAGES IN THE TEST LEADS OF THE MULTIMETER IN SUCH CASES THE ACCURACY OF THE MULTIMETER CANNOT BE GUARANTEED DUE TO PHYSICAL REASONS Basic Specifications DC Voltage AC Voltage 703 True RMS 701 Basic Accuracy DC Current AC Current 703 True RMS 701 Resistance Capacitance Frequency Duty Cycle Diode Test Continuity Check 0 to 1000 V 15 mV to 1000 V 40 Hz to 20 kHz 0 to 1000 V 40 Hz to 400 Hz DC voltage 0 5 AC vdtage 0 75 0 to 10 A 20 A for 30 seconds 20 pA to 10 A 20 A for 30 seconds 0 to 10 A 20 A for 30 seconds 0 to 40 MQ 0 01 nF to 100 F 0 5 Hz to 10 MHz 0 1 to 99 9 for 0 5 Hz to 500 kHz pulse width gt 2 usec 25V Beep at Approx lt 10 Q response time lt 1 ms Temperature 703 only 40 C to 1300 C 40 F to 2372 F A Warning Read Safety Information before using this Meter CONTENTS 1 Safety Information 5 Meter Operation 6 Maintenance 7 Specifications 2 Electromagnetic Compatibility EMC 3 Controls and Indicators 4 Rotary Switch and Pushbutton Overview 1 S
9. ack probe to the more negative side of the break Reversing the leads will produce a negative reading but will not damage the meter 16 4 Turn on power to the circuit and read the display 5 After measuring current turn off power to the circuit and discharge all high voltage capacitors Disconnect the meter and restore the circuitto normal operation Es i SERIES CONNECTION SERIES CONNECTION Tips for measur ing current When measuring a 3 phase system special attention should be taken to the phase to phase voltage which is significantly higher than the phase to earth voltage To avoid exceeding the voltage rating of the protection fuse s accidentally always consider the phase to phase voltage as the working voltage for the protection fuse s When measuring current the meter s internal shunt resistors develop a voltage across the meter s terminals called burden voltage This voltage drop may affect precision circuits or measurements 17 Auto Manual Range Operation Press the RANGE button momentarily to select manuatranging in volts ohms and currents measurement function and the meter will remain in the range it was in when the LCD annunciator turns off Press the button momentarily again to step through the ranges Press and hold the RANGE button for 2 seconds to resume auto ranging Manual ranging feature is not available in Hz Duty CAP Temp i and i fu
10. e 10000m Single 9V battery NEDA 1604 JIS 006P or IEC 6F 22 Battery Life Shock Vibration Pollution Degree Electromagnetic Compatibility EMC Size H x W x L Weight Calibration Interval Feature Summary Backlight Fast Autoranging HOLD Continuity Open test Battery Fuse Access Door High Impact Overmolded Case 250 hrs typical with backlight off 703 750 hrs typical with backlight off 701 Per MIL T PRF 28800 for Class II instruments 2 Susceptibility Commercial Limits for EN 50082 1 Emissions Commercial Limits for EN 50081 1 40 5 x 92 x 172 mm Approx 386g 1 year For clear readings in poorly lighted areas Meter automatically selects the best range momentarily Holds readings on display Beeper sounds battery or fuse replaceable without voiding calibration Protective holster features 21 Electrical Specifications Accuracy is given as of reading number of digits at 18 C to 28 C with relative humidity up to 80 for a period of one year after calibration True RMS responding accuracies are specified from 5 to 100 of range or otherwise specified Crest Factor lt 3 1 at full scale and lt 6 1 at half scale DC Voltage Range Resolution 4V 05 2 oe wv 407 7000 Y NMRR gt 60dB 50 60 Hz CMRR gt 120 dB DC 50 60 Hz Rs 1kQ Input Impedance 10 MQ 30 pF nominal 50 MQ 100 pF nominal for 400 mV range
11. er or the equipment under test the resistor s rated value The test leads can add 0 1 Q to 0 2 Q of error to resistance measurements remove all power from the circuit and discharge all high voltage capacitors before measuring resistance To measure the resistance of the leads touch the probe tips together and read the resistance If necessary you can press the RELA button to automatically subtract this value Resistance is an opposition to current flow The unit of resistance is the ohm Q The resistance function can produce enough voltage to forward bias silicon diode The meter measures resistance by sending a small current through the circuit or transistor junctions causing them to conduct Do not use the 40 MA range for measuring the in circuit resistance to avoid this Ranges available in resistance functions are When measuring large resistance reading may be unstable due to environmentally induced electrical noise In this case directly connect the resistor to input terminals of the meter or shield the resistor at potential of the COM input terminal to obtain stable reading For resistance above 1 MQ the display may take a few seconds to stabilize This is normal for high resistance readings The meter has a circuit to protect the resistance range from over voltage However to prevent accidentally exceeding the protection circuit s rating and to ensure a correct measurement NEVER CONNECT THE LEADSTO A SOURCE OF
12. gle pulse trains spikes and transient glitches as well as distorted waveforms with the presence of harmonics Non sinusoidal waveforms may cause Overheated transformers generator and motors to burn out faster than normal Circuit breakers to trip prematurely Fuses to blow Neutrals to be overheated due to the triplen harmonics present on the neutral Bus bars and electrical panels to vibrate Crest Factor Crest Factor is the ratio of the Crest instantaneous peak value to the True RMS value which is commonly used to define the dynamic range of a True RMS DMM A pure sinusoidal waveform has a Crest Factor of 1 414 A badly distorted sinusoidal waveform normally has a much higher Crest Factor NMRR Normal Mode Rejection Ratio NMRR is the DMM s ability to reject unwanted AC noise effect which can cause inaccurate DC measurements NMRR is typically specified in terms of dB decibel The Meter has a NMRR specification of gt 60dB at 50Hz 60Hz which means a good ability to reject the effect of AC noise in DC measurements CMRR Common Mode Rejection Ratio Common mode voltage is voltage existing on both the COM and Voltage input terminals of a DMM with respect to ground CMRR is a DMM s ability to reject common mode voltage effect which can cause digit rattle or offset in voltage measurements The Meter has a CMRR specification of gt 60dB at DC to 60 Hz in AC volts measurement function and gt 120 dB at D
13. he meter or the equipment under test remove all power from the circuit and discharge all high voltage capacitors before measuring capacitance Large value capacitors should be discharged through an appropriate resistance load Use the dc voltage function to confirm that the capacitor is discharged Capacitance is the ability of a component to store an electrical charge The unit of capacitance is the farad F Most capacitors are in the nanofarad nF to microfarad uF range The available capacitance ranges are 40nF 400 nF 4 uF 40 uF and 100 pF 14 Tips for measuring capacitance In capacitance the Meter is always autoranging In 40 nF range the readings are probably unstable due to environ mentaly induced electrical noise and floating capacity of the test leads Therefore directly connect the object to be measured to the input terminals Temperature Temp Measurements Model 703 only The meter comes with temperature reading in either Centigrade or Fahrenheit preset at the factory The reading mode can be changed at the factory only Xx The SELECT function is not available in Temperature mode AN WARNING Do not apply thermocouple to circuits exceeding 30V rms 42 4V peak or 60V dc Be sure to insert the banana plug K tye te mperature bead probe TP7 with correct polarities You can also use a thermocouple probe adapter TP1 A Optional purchase to adapt other standard K type tem
14. his manual If the meter s V Q input terminal has subjected to high voltage transient caused by lightning or switching surge to the system by accident or abnormal operating conditions the series fusible resistors will be blown off like fuses in order to protect the user and the meter Most measuring functions through this terminal will then be open circuit In this case the series fusible resistors and the spark gaps should be replaced by qualified personnel 19 7 SPECIFICATIONS Safety amp Compliances Maximum voltage between any terminal and earth ground Compliances Certifications Surge Protection 1000 V ac dc Complies with CSA C22 2 No 1010 1 92 ANSI ISA S82 01 94 to 1000 V Overvoltage Category Ill UL amp cUL standard UL 3111 1 Listed CE marking certificated 8 kV peak per IEC 1010 1 92 A Fuse Protection for mA or pA inputs 1000 V 440 mA IR 10 kA FAST fuse AN Fuse Protection for A input 1000 V 11 A IR 10kA FAST fuse Physical Specifications Display LCD Operating Temperature Storage Temperature Temperature Coefficient Relative Humidity Altitude Battery Type 20 Digital 4000 counts display updates 5 times sec 0 C to 40 C 20 C to 60 C nominal 0 15 x specified accuracy C 0 C to 18 C or 28 C to 40 C or otherwise specified 0 to 80 0 C to 35 C 0 to 70 35 C to 40 C Operating up to 2000m Storag
15. nctions Auto Power Off The Auto Power Off feature automatically turns the meter off to extend battery life after approximately 30 minutes of no activities To tum on the meter after Auto Power Off turn the rotary switch from OFF to any function ON 18 6 MAINTENANCE A Warning To avoid electrical shock or personal injury remove the test leads and any input signals before replacing the battery or fuses To prevent damage or injury install only the same type of fuses or equivalents Cleaning and Storage Periodically wipe the case with a damp cloth and mild detergent do not use abrasives or solvents Clean the input terminals as follows 1 Turn the meter off and remove all test leads 2 Shake out any dirt that be in the terminals 3 Soak a new swab with alcohol and work the swab around in each terminal If the meter is not to be used for periods of longer than 60 days remove the battery and store it separately Battery and Fuse Replacement The meter uses a single standard 9V battery NEDA 1604 JISOO6P IEC 6F 22 a 1000 V 440 mA IR 10 KA fast acting F fuse Fr1 for mANA current input and a 1000 V 11 A IR 10KA fast acting F fuse F72 for A current input The F7 440 mA F72 11 A fuse must be replaced by qualified service personnel only Trouble Shooting If the meter fails to operate even with the battery or fuse replacements check it twice over according to operating procedure as described in t
16. perature probes 15 Current Measurements pA mA gt 104 AB Warning Never attempt an in circuit current measurement where the open circuit potential to earth is greater than 1000V You may damage the meter or be injured if the fuse blows during such a measurement Caution Check the meter fuses before measuring current Use the proper terminals function and range for current measurements Never place the probes in parallel with any circuit or component when the test leads are plugged into the current terminals Current is the flow of electrons through a conductor To measure current you must open the circuit under test then place the meter in series with the circuit The available current ranges are 400 0 pA 4000 pA 40 00 mA 400 0 mA 4 000 A and 10 00 A The meter defaults at de Press SELECT button momentarily to select ac To measure dc or ac current 1 Tum off power to the circuit and discharge all high voltage capacitors 2 Insert the black lead into the COM terminal and the red lead into an input terminal appropriate for the measurement range as the following table Range pa Fs aO ma ADO A A000 uA m mA 40 00 mA 400 0 mA 4 000 A 10 00 A To avoid blowing the meters 440 mA fuse use the MALA terminal only if you are sure the current is less than 400 mA 3 Open the current path to be tested Touch the red probe to the more positive side of the break and touch the bl
17. r attempt a voltage measurement with the test lead inserted into the mA pA or A input terminal When servicing the meter use only specified replacement parts Remove test leads from the meter before you open the battery door Do not operate the meter with the battery door removed or loosened To avoid false readings which could result in possible electric shock or personal injury replace the battery as soon as the low battery indicator appears Avoid working alone Caution Disconnect the testleads from the test points before changing functions Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity capacitance or diodes Always set the meter to the highest range and work downward for an unknown value in the manual ranging mode Before measuring current check the meters fuses and turn power OFF to the circuit before connecting the meter to the circuit 2 INTERNATIONAL ELECTRICAL SYMBOLS AC Alternating Current DC Direct Current Either AC or DC Caution Refer to the explanation in this manual Caution Dangerous voltage Risk of electric shock Earth Ground Double insulation or Reinforced insulation Fuse Not Applicable to Identified Model po orbBbd n Battery 2 ELECTROMAGNETIC COMPATIBILITY EMC The meters meet EN61326 1997 A 1998 See the backside of this manuals cover page Although this manual describes the operation of both Model 701 and Model 703 all
18. t In many cases the suspicious components must be disconnected from the circuit under test to obtain accurate results Frequency Hz Measurements Frequency is the number of cycles a signal completes each second The meter measures the frequency of a voltage or current signal by counting the number of times the signal crosses a threshold level each second To measure the frequency of a voltage or current signal press the Hz Duty button momentarily while measuring volts or currents The available frequency ranges are 5 Hz 50 Hz 500 Hz 5 kHz 50 kHz 500 kHz 5 MHz and 10 MHz 7 13 Tips for measuring frequency Infrequency the meter is aways autoranging When disconnecting the input terminals the overload sign may be displayed or the display may unsteadily fluctuate This is typical Duty Cycle Measurements Duty Cycle or Duty Factor is the percentage of time a signal is above or below a trigger level during one cycle The duty cycle mode is optimized for measuring the ON or OFF time of logic and switching signals Systems such as electronic fuel injection systems and switching power supplies are controlled by pulses of varying width which can be checked by measuring duty cycle Press the Hz Duty button to toggle between the Hz mode and the Duty Cycle mode when the rotary selector knob is set to Hz Duty N pA i m or 104 Capacitance Measurements Caution To avoid damaging t
19. the circuit impedance is 10 kQ or less PARALLEL CONNECTI N Panel Tips for measuring voltage In 400 mV range displayed value may fluctuate when disconnecting input terminals This is normal AC voltage measuring circuit in Model 703 is of root mean square True RMS value system so the meter can accurately measure ac voltage of non sinusoidal waveforms including harmonics caused by various non linear loads 9 e To improve the accuracy of dc voltage measurements taken in the presence of ac voltages such as measuring the dc voltage of an amplifier in the presence of an ac signal measure the ac voltage first Note the just measured ac voltage range and select a dc voltage range that is the same or higher than the ac voltage range This method improves the dc voltage accuracy by preventing the input protection circuits from being activated A Warning To avoid the risk of electrical shock and instrument damage input voltages must not exceed 1000 V dc or ac rms Do not attempt to take any unknown voltage measurement that may be in excess of 1000 V dc or ac rms Resistance Q if Measurements Ohms Diode and Continuity Tips for measuring resistance Because the meter s test current flows through all possible paths between the Caution test probe tips the measured value of a resistor in a circuit is often different from To avoid damaging the met
20. urement Temp Model 703 only Temperature measurement in degrees Centigrade or Fahrenheit Changing the reading mode should be preset at the factory uA Micro amps ac rms and micro amps dc measurements Model 703 Micro amps ac and micro amps dc measurements Model 701 mA Milli amps ac rms and milli amps de measurements Model 703 Milli amps ac and milli amps dc measurements Model 701 ne A Amperes ac rms and amperes dc measurements Model 703 Amperes ac and amperes dc measurements Model 701 Pushbuttons The buttons activate features that augment the function selected with the rotary switch RANGE Use the RANGE button to manually select a range Press and hold RANGE button for two seconds to return the meter to auto range mode The meter is in auto range mode when the AUTO indicator is on The RANGE selection function is not available in Hz Duty CAP and Temp modes The range and units are displayed on the LCD RELA Use this button to set the meter to relative A_ mode and make relative measurements Relative zero allows the user to offset the meter consecutive measurements with the displaying reading as the reference value Practically all displaying readings can be set as relative reference value Press the REL A button momentarily to activate and to exit relative zero mode Hz Duty Press this button to toggle between the Hz measurement mode and the Duty measurement mode when the selector switch is set to Hz
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