Page 1
MANUAL DE INSTRUÇÕES DO MULTÍMETRO DIGITAL MODELO MD-6520 (versão em Inglês) Leia atentamente as instruções contidas neste manual antes de iniciar o uso do instrumento...
SAFETY INFORMATION This meter is a hand-held, battery-operated instrument for testing and troubleshooting power electronic systems. If this device is damaged or something is missing, contact the purchasing place immediately. A WARNING identifies conditions and actions that may cause hazard(s) to the user;...
Page 6
SAFETY INFORMATION Warnings and Cautions To avoid electric shock, injury, or damage to this instrument and ensure that you use the meter safely, follow the safety guidelines listed below: • Read this operation manual completely before using this device and follow all safety instructions.
MULTI-DISPLAY MULTIMETER INTRODUCTION The meter is robust for industrial fields and laboratories. Smart charger provides you a chance to protect Earth environment because rechargeable battery of NiMH optional. The ambient temperature can be display with main measurement, which can help you to do monitor the electrical value and record environment variation, simultaneously.
GETTING START WITH YOUR METER Display Illustration Without ambient temperature compensation Alternating/ Direct Current Thermal type for Secondary Display for Square temperature test wave Output and other Remote control Secondary display units Auto Range Dynamic Diode/Audible Recording continuity % 0-20: 0-20mA Alternating/ Direct Current % 4-20:4-20 mA...
Rotary Switch WARNING Be sure to remove the test leads from measuring source or target before changing rotary switch. To turn this device ON and select a function you want by turning the rotary switch. Table- 2 Rotary Switch position Position Function Resistance/ Continuity/ nS...
TERMINALS WARNING To avoid damaging this device, do not exceed the input limit. To avoid damaging the meter, do not exceed the input limit as below table: Table- 3 Input limit specification ROTARY SWITCH INPUT OVERLOAD FUNCTION TERMINAL PROTECTION 1000 V R.M.S. V.Ω.
PUSH-BUTTON OPERATIONS The operation of push-button is shown as below. When push the button, a related symbol will be lit, and the beeper will sound. Turning the rotary switch to another position will reset current operation of push buttons. REL: Set the value on HOLD: Freeze the display to be existing measuring...
Page 13
1. AC/ DC (BLUE): Select Blue function Push this button momentarily to step through DC, AC for mV measurement. Push this button momentarily to step through DC, AC and % of mA for Current measurement. For Ohm test, push this button momentarily to step through continuity “...
Page 14
4. REL (ZERO): Relative function The relative function shows the difference between the measured value and the stored value. Press to toggle Relative (REL) ON or OFF. For Voltage and current measurements, press this button for more than 1 second to toggle 1 ms peak hold ON/OFF. The display will show “ MAX”...
Hang Belt The hang belt provides two ways to hang up the meter as follows: 1. Hang on the meter to 2. Hang on the meter to the pipe by open button, a nail or hook and then fix the belt to pipe. Follow below steps to fix the hang-belt to holster.
POWER-ON OPTION How to enter setup mode Press and hold SETUP (Blue) button, then turn rotary switch to any on position form OFF. Release push button when you hear a tone, the meter will enter setup mode then. These parameters will be remained in non-versatile memory even the meter is turned off.
Page 17
Table- 4 Descriptions for Outline of Setup Menu Item Factory Menu item Selectable Parameters Setting Baud Rate 9600 2400, 4800, 9600, 19200 None Odd, even or none Parity 8 bits or 7 bits (Stop bit is always 1 bit) Data bits ON or OFF ECHO Print...
Parity Check The parity check is selected for remote control. It can be set to none, even or odd bit. To select the parity as follows: Figure- 7 Parity Check setup for remote control Data Bit The data bit is selected for remote control. It can be set to 8 or 7 bits. The stop bit is defined to 1 bit and can’t be changed.
Echo With ECHO ON, the meter echoes (returns) all the characters whatever it receives. To enable the Echo as follows: Figure- 9 ECHO Setup Print only If the remote interface of the meter is under Print-only mode, the meter will print out the measured data when the measuring cycle is completed.
Percentage (%) scale for 4-20mA or 0-20mA measuring To set the DC current measuring display with % scale readout. Set 4-20mA or 0-20mA for proportional to 0%~100%. The 25% scale readout represents DC 8mA at 4-20mA, and DC 5mA at 0-20mA. To set % scale proportional as follows: Figure- 11 The % scale Setup for mA measuring.
Temperature Unit CAUTION Always set the temperature unit display for official requirements and comply with National law. Normally, the temperature unit is different for various areas. To select an official required scale unit by setup mode. Four combination displays can be selected: Celsius only (°C on primary display) Celsius/ Fahrenheit (°C/ °F) display can be switched by pushing DUAL button.
Data Hold/Refresh Hold Normal, factory default the hold mode to Data Hold (Manual Trigger by key/ BUS trigger by remote control). Set “OFF” for Data Hold (Manual Trigger), and set 100~1000 variation counts to enable Refresh Hold. The variation of measuring value exceed the setting of variation count, the refresh hold will be ready to trigger.
Auto Power Saving The timer for APS (Auto Power Saving) can be set to 1~99 minutes, “OFF” means to disable APS. To set timer of APS as follows: Some version the “APS” is indicated by “AoFF”. Figure- 17 Auto power saving setup The instrument may automatic turn off within a setting period, if none of the following happens.
BARGRAPH The analog bar-graph likes the needle on an analog meter, but without the overshoot. The bar-graph updates are faster than the digital display. That is quite useful for making peak and null adjustments and observing rapidly changing inputs. The bar-graph would not be used for frequency, duty cycle, pulse width, 4-20mA % scale, 0-20mA % scale and temperature measurements.
ALERTING OVERLAOD ALERT FOR VOLTAGE MEASUREMENT WARNING For your safety, please be aware of the alert. Don’t be nervous and just remove the test leads from measuring source. This meter provides an overload alert for voltage measurement during auto-ranging mode or manual range can recognize 1010V. The beeper sounds tones periodically once the measuring voltage is exceeded alerting voltage of 1010.0V.
Charge Terminal ALERT The meter sounds alerting beep when the “ ” terminal detected a voltage level more than 3~5V and the rotary switch didn’t set to “ ” position. The meter sounds alerting beep and primary display indicates and flashes “CH.Err”...
Capacity check of battery This meter has provided battery capacity check. Press the button of “BAT ” for more than one second to see battery capacity. It will return to normal function indication automatically after 3 seconds. See following figure: The battery level will Press BAT be indicated and...
CALCULATION FUNCTION This device provides operators with various functions including: Dynamic Recording Data Hold Trigger Hold Refresh Hold Relative (Zero) Decibel display Peak Hold DYNAMIC RECORDING The dynamic recording mode can be used to catch intermittent turn on or turn off surges, verify performance, measure while you are away, or take readings while you are operating the equipment under test and can’t watch the meter.
DATA HOLD The data hold function allows operators to hold the displayed digital value. The bar-graph didn’t be held, still proportional to real measurement value. Press HOLD button to freeze the displayed value, and the sign of will be displayed. Figure- 26 Data Hold Operation Press HOLD button for more than one second to exit this mode.
REFRESH HOLD You can use the setup mode to enable the Refresh Hold when you are working on a difficult measuring field. This function will auto trigger or update HOLD value with new measuring value, and sound a tone to remind user. The operation of push-button is same as the operations of Data hold.
For voltage and current measurements, the holding value will not be updated when the reading below 500 counts of minimum range. Function Range Limit Value 5V~1000V ±0.0500V DCmV 50mV~1000mV ±00.500mV 5V~1000V 0.0500V ACmV 50mV~1000mV 00.500mV DCμA 500μA~5000μA ±005.00μA DCmA 50mA~500mA ±00.500mA 5A~10A ±0.0500A...
Decibel display The dBm operation calculates the power delivered to a reference resistance to 1 milliwatt, and can be applied to Vdc, Vac and Vdc+Vac measurements for decibel conversion. Voltage measurement is converted to dBm by using the following formula: dBm = 10x log [1000 x (measuring value) /reference)
Page 42
The decibel of voltage is calculated for above or below 1V. It can be selected by setup mode. It will be another temporary way to toggle dBV and dBm display by pushing SHIFT button for more than one second as dB selected. The formula is according to voltage measurement as below: dBV = 20 log Push SHIFT button momentarily to toggle the dBV display on the primary...
Peak Hold You can use this Meter to analyze components such as power distribution transformers and power factor correction capacitors. The additional features allow the measurement of the half-cycle peak voltage by using the peak hold feature. This allows the determination of the crest factor: Crest factor = Peak value/True RMS value Press PEAK button for more than 1 second to toggle peak hold mode ON/OFF.
REMOTE COMMUNICATION This instrument has a bi-directional (full duplex) communication capability. This function will assist user to record and keep data easily. The protocol is provided by SCPI commands (Standard Commands for Programmable Instruments). You can simply use your familiar language to design what application software you want.
Page 46
6. Execute the software to take the data as your needs. 7. Always press second snap slightly to remove the cable from communication port of the meter. See the snap as below picture. Always press second snap slightly to remove the cable from communication port of the meter.
MULTI-DISPLAY MULTIMETER The frequency measuring helps detect the presence of harmonic currents in neutral conductors and determines whether these neutral currents are the result of unbalanced phases or non-linear loads. Selection by Hz Button For Voltage or Current test, press Hz button momentarily to enter Frequency test.
Selection by DUAL button It is another way to have combination display. Press DUAL button momentarily to select different combinations of dual display. The DUAL button will be disabled as Recording mode or TRIG mode enabled. The combinations of dual display are shown as following table.
How to Operate AC VOLTAGE MEASUREMENT The meter presents AC voltage values as R.M.S. (Root Mean Square) readings. The RMS value is the equivalent dc voltage that would produce the same amount of heat in a resistance as the measured voltage. This meter features TRUE-RMS readings, which are accurate for sine-waves and other waveforms (with no dc offset) such as square waves, triangle waves, and staircase waves.
% scale of 4-20mA The % scale for 4-20mA or 0-20mA is calculated by DCmA measurement. It will optimize the best resolution automatically as below table. The RANGE button and bar-graph is used for ranging 50mA and 500mA. The % scale for 4-20mA or 0-20mA is set two ranges as follows: %(0-20 or 4-20mA) DCmA...
RESISTANCE/ CONTINUITY MEASUREMENT Caution To avoid possible damage to the meter or the equipment under test, disconnect circuit power and discharge the capacitor before measuring capacitance. The meter measures resistance by sending a small current through the circuit. The unit is the ohm (Ω). For Ohm test, press “SHIFT”...
Page 61
For other ranges, the beeper will sound if the resistance falls below the typical values indicated in below table. Table- 6 Beeper Responses in Continuity Test Measuring range Beeper On if 500.00 Ω <10 Ω <100 Ω 5.0000 kΩ 50.000 kΩ <1 kΩ...
CONDUCTANCE MEASUREMENT Conductance is the reciprocal of resistance. High values of conductance correspond to low values of resistance. The unit of conductance is the Siemens (S). The 50 nS range measures conductance in nano-siemens (1 nS = 0.000000001 Siemens). Because small conductance correspond to extremely high resistance, the nS range lets you easy calculate and determine the resistance of components up to 100 GΩ...
DIODE CHECK A good diode allows current to flow in one direction only. To test a diode, turn the power off, remove the diode from the circuit, and proceed as follows: Set the rotary switch to " " position. Connect the red/ black test leads to " "...
CAPACITANCE Caution To avoid possible damage to the meter or the equipment under test, disconnect circuit power and discharge the capacitor before measuring capacitance. Use the DC voltage function to confirm that the capacitor has been discharged. Capacitance is the ability of a component to store an electrical charge. The unit of capacitance is the farad (F).
BIPOLAR JUNCTION TRANSISTOR The BJT (bipolar junction transistor) is composed of input and output circuits by using one of electrodes namely, emitter, base, or collector as the common terminal. The transistor has polarities for PNP or NPN type. To get the related data sheet from manufacturers will be highly recommended.
JFET SWITCH TEST The JFET (Junction Field-Effect Transistor) is composed of input and output circuits by using one of electrodes namely, Drain, Gate, or Source as the common terminal. The JFET has different type for P or N channel switch. To get the related data sheet from manufacturers will be highly recommended.
Page 73
-15.000V, and the R will be increased until “OL” of resistance measurement. You will know the cutoff voltage for this N-channel switch. Figure- 53 N- Channel JFET 9. If the RDS increased as the V (GS) is positive voltage, this JFET will be P-channel.
Temperature Measurement CAUTION Do not bend the thermocouple leads, sharply. Repeatedly bending the leads can break them. The bead type thermocouple probe is suitable for making temperature measurements from -40°C (°F) to 204°C (399°F) in Teflon compatible environments. Above this temperature, toxic gas might be emitted. Do not immerse this thermocouple in liquids.
SECTION 5CALIBRATING THE METER CAUTION! TO AVOID DAMAGING THE DEFAULT CALIBRATION DATA STORED IN A NON-VOLATILE MEMORY, A CALIBRATION TO THE METER CAN ONLY BE DONE BY AN AUTHORIZED SERVICE CENTER AND QUALIFIED PERSONNEL WITH APPROPRIATE EQUIPMENT. FOR DETAIL INFORMATION ABOUT CALIBRATION PROCEDURES, PLEASE CONTACT FACTORY OR AUTHORIZED DISTRIBUTOR.
RECOMMENDED TEST EQUIPMENT The test equipment requirements listed in Table or equivalents are required to perform the this device calibration and performance verification test procedures. Alternative equipment may be used as long as the accuracy is as good as thosee specifications listed at least.
SPECIFICATIONS GENERAL SPECIFICATION Display: Both primary and secondary displays are 5-digit liquid crystal display (LCD) with maximum reading of 51000 counts. Automatic polarity indication. Function: DCV, ACV, DCA, ACA, OHM, Diode check, Audible continuity, Temperature, Frequency, Duty cycle and Pulse Width tests. AC true RMS measurement for both voltage and current.
Page 79
Relative Humidity (R.H.): maximum 80% R.H. for temperature up to 31°C decreasing linearly to 50% R.H. at 50°C Temperature coefficient 0.15x (specified accuracy) / °C (from 0°C to 18°C or 28°C to 50°C) Common Mode Rejection Ratio (CMRR): >90 dB at DC, 50/60 Hz±0.1% (1kΩ unbalanced) Normal Mode Rejection Ratio (NMRR): >...
ELECTRICAL SPECIFICATIONS Accuracy is given as ±(% of reading + counts of least significant digit) at 23°C ± 5°C, with relative humidity Less than 80% R.H. DC mV/ Voltage Overload Range Resolution Accuracy Protection 50mV 0.001mV 0.05% +50 1000V for the 500mV 0.01mV circuits <0.3A...
Page 81
dB (decibel calculation) dB base Reference Default Reference 1mW (dBm) 1~9999 Ω Ω 1V (dBV) Notes: 1. The reading of dBm is indicated in decibels of power above or below 1mW, or decibels of voltage above or below 1V. The formula is according to voltage measurement and specified reference impedance.
MAINTENANCE WARNING To avoid electrical shock, do not perform any service unless you are qualified to do so. SERVICE If the instrument fails to operate, check battery and test leads, and replaces them if necessary. If the instrument still can’t work, double check operating procedure as described in this instruction manual.
BATTERY REPLACEMENT WARNING ONLY NICKEL-METAL HYDRIDE BATTERY CAN BE CHARGED, ALL BATTERIES MUST BE RECYCLED OR DISPOSED OF PROPERLY. Remove all test leads and external adaptor before opening the case. The meter is powered by 9 V battery, be sure to used specified battery. To ensure the specification specified, it is suggested to replace battery immediately as the sign of low battery is displayed and flashing.
HOW TO CHARGE BATTERY WARNING Never discharge the battery by short battery or reverse polarity in any subjects. Always check whether the battery is rechargeable battery before charging battery. Never rotate the rotary switch under charging as DC 24V has been applied to charging terminals.
Page 90
4. The primary display will indicate existing battery level, and the “SBY” is flashing on second display and short tone sounds to remind you whether to charge battery or not. If you want to charge battery, just one touch by pushing “...
Page 91
5. The meter will do self-test to check whether inside battery is rechargeable or not. The self-test will take 2~3 minutes, no pushbuttons can be operated in this period. If something wrong, the error message will be indicated as following: Three segments displayed...
Page 92
6. The smart charging mode will be started if passed self-test. The charge time is limited within 135 minutes. That means the battery will not be charged over 135 minutes. The secondary display will count down the charging time. You can expect when the battery will be fully charged. During charging period, no pushbuttons can be operated.
FUSE REPLACEMENT Use the following procedures to replace the fuses of the meter: Use the rotary switch to turn the meter off, and disconnect the test leads from external equipment. Be sure the adaptor has been removed. Remove the cover of battery compartment as Fuse replacement. Loosen 3 screws on bottom case, pull up and remove the cover.
CLEANING WARNING To avoid electrical shock or damage to the meter, do not get water inside the case. To clean the instrument, use a soft cloth dampened in a solution of mild detergent and water. Do not spray cleaner directly onto the instrument, since it may leak into the cabinet and cause damage.