User`s manual for VC99 3 6/7 DMM
Contents
1. Fuse change When replacing fuse please change another same type and specification fuse 6 Trouble shooting If the meter does not work properly check the meter as following Fault Solution m Turn on the power No reading on LCD m Replace battery signal appears m Replace battery No current or m Replace fuse temperature input Big error Value m Replace battery m The voltage was ACV big error value measured frequency higher than 400Hz m The specifications are subject to change without notice m The content of this manual is regarded as correct error or omits Pls contact with factory m We hereby will not be responsible for the accident and damage caused by improper operation The function stated for this User Manual cannot be the reason of special usage E VC99 V1 0 Prepared http digitalchip ru2. GE ACCURACY RESOLUTION 40nF 3 5 10 10pF 400nF 100pF Aur 2 5 5 inF 40uF 10nF 400uF 100nF 2000uF HNED 1uF Overload protection 250V DC or AC peak value 2 8 REQUENCY F RANGE ACCURACY oo 10Hz 0 01Hz 100Hz 0 1Hz 1000Hz 1Hz 10kHz 0 5 4 10Hz 100kHz 100Hz 1MHz 1kHz 60MHz 10kHz Input sensitivity 0 7V Over load protection 250V DC or AC peak value 2 9 Transistor hFE TESTING RANGE VALUE CONDITION Basic current NPN OR PNP 0 1000 approx 15yA Vce approx 4 5V 2 10 Diode and continuity performance test ran TESTING ge wee CONDITION Forward DCA is approx 0 5mA the backward voltage is approx 1 5V Forward voltage drop of diode gt o Buzzer makes a long sound while resistance is less than 50 10 Q Over load protection 250V DC or AC peak value Open circuit voltage is approx 0 5V CAUTION DO NOT INPUT VOLTAGE AT THIS RANGE 2 10 TEMPERATURE C RESOLUT RANGE VALUE ON z 400 C 40 C 1000 C 0 8 4 1 C 2400 C 1 5 15 2 750 F ae 0 8 5 OF 1832 F eats F 1 5 15 Sensor TP01 K type thermocouple CAUTION DO NOT INPUT VOLTAGE AT THIS RANGE 4 OPERATION 4 1 Panel description 1 LCD display the measuring value and unit 2 Function key 2 1 HOLD key press it the presently measured value is held on LCD and H
3. Introduction for safety symbol aL A exists high voltage GND Jeg dual insulation A must refer to manual 2 Low battery 3 SPECIFICATION 1 General features 1 1 Displaying LCD 1 2 Max display 6000 3 6 7 digits automatic polarity unit symbol and 61 section analog display 1 3 Measurement method double integral A D conversion 1 4 Sampling rate approx 3 times sec 1 5 Over range display OL displayed in the highest digit 1 6 Low battery display 1 7 Working environment 0 40 C relative humidity lt 80 1 8 Store environment 10 40 C relative humidity lt 80 1 9 Power supply 2pcs 1 5V battery AAA battery 1 10 Dimension 185x93x35mm length width height 1 11 Weight approx 290g including battery 1 12 Accessories test leads user manual temperature probe holster gift box and 2 1 5V battery 2 TECHNICAL FEATURES 2 1 Accuracy a x reading data digits environment temperature at 23 5 C relative humidity lt 75 One year guarantee since production date 2 2 DC Voltage DCV Range Accuracy Resolution 600mV 0 1mV 6V 1mV 60V sere T0mV 600V 100mV 1000V 0 8 3 1V Input impedance approx 10MQ Overload protection 1000V DC or 750V AC 2 3 AC Voltage ACV Range Accuracy Resolution 6V mV 60V 0 8 5 10mV 600V 100mV 750V 1 0 5 1V Input impedance a
4. OLD symbol displays Press it again HOLD symbol disappears and the meter is exited the holding mode 2 2 REL key press it reading clear turn into relative value measurement states REL symbol displays Press it again REL symbol disappears and the meter is exited the relative mode 2 3 Hz DUTY key When measuring the AC Voltage Current press it it will switch Frequency duty When Frequency it will switch frequency duty cycle 1 99 2 4 DC AC key switch DC and AC work mode 2 5 RANGE key select auto range or manual range cycle Voltage Current measuring the mode Auto range is the original states it will display AUTO symbol press it change to manual range Press it more than 2 second it will return to auto range states 2 6 MAX MIN key press it turn into MAX mode it will hold the max value of measuring press it again turn into MIN mode it will hold the min value of measuring No auto power off and analog bar display under this mode Press it more than 2 second it will exit MAX MIN states 3 hFE transistor COM 4 Knob function and range 5 Temperature COM 6 Voltage Current resistance gt frequency and GND COM 7 battery case Switch measuring See picture 1 4 2 DCV measuring 1 Select the knob to V range 2 Insert the black test lead to COM terminal and the red one to V Q Hz terminal 3 Auto range is the original states it will displ
5. User s manual for VC99 3 6 7 DMM 1 SUMMARY This digital multimeter is a steady performance battery driven 3 6 7 digital multimeter It uses the LCD with 23mm high figure to make the reading clear and make operation more convenient The digital multimeter has the function of measuring DCV ACV DCA ACA frequency temperature duty cycle transistor and diode resistance capacitance continuity performance test The meter can provide functions including analog bar and unit symbol display data holding relative value measuring maximal minimal value measuring auto manual range switching RANGE auto power off and warning functions it adopts double integral A D converter as its core It is an ideal tool for labs factories and radio technology 2 SAFTY NOTES The instrument is designed according to IEC1010 standard safety standard issued by International Electro technical Committee Please read the following before operation 1 1 Check the connection and insulation of test leads to avoid electric shock 1 2 Do not input a limited voltage higher than DC 1000V or AC 750V when measuring ranges 1 3 When measuring voltage higher than DC 60V AC 40V please be careful 1 4 Select correct function and range to avoid fault operation 1 5 Please move the test leads away from test points when switching the function 1 6 Please don t input voltage value when measuring current 1 7 Please don t modify the circuit 1 8
6. ay AUTO symbol press RANGE key change to manual range 600MV gt 6V gt 60V gt 600V gt 1000V mode range is selective 4 Connect the leads crossly to the electric circuit under test LCD displays polarity and voltage under test connected by the red test lead Note 1 Firstly users should select the knob to the highest range if users had no idea about the range of voltage under test and then select the proper range based on displaying value If LCD displays OL it means meter is over the max Value of this range thus should select the knob to a higher range 2 Do not input a voltage over DC 1000V 3 Be carefully while measuring a high voltage DO NOT touch the high voltage circuit 4 When the measuring voltage large than DC1000V the built in buzzer will be sounds 4 3 ACV measuring 1 Select the knob to V range 2 Insert the black test lead to COM terminal and the red one to V Q Hz terminal 3 Auto range is the original states it will display AUTO symbol press RANGE key change to manual range mode 6V gt 60V gt 600V 750V range is selective 4 Connect the leads crossly to the electric circuit under test LCD displays voltage by the test lead Note 1 Firstly users should select the knob to the highest range if users had no idea about the range of voltage under test and then select the proper range based on displaying value If LCD display
7. ctric circuit under test LCD displays current by the test lead Note 1 Firstly users should select the knob to the highest range if users had no idea about the range of current under test and then select the proper range based on displaying value 2 If the LCD displays OL it means the current is over range Now you need to select the knob to the higher 3 Max input current is 600mAor 20A subject to where the red test lead insert to too large current will damage the fuse 4 6 Resistance measurement 1 Select the knob to a proper resistance range and connect the leads crossly with the resistor under tested 2 insert the black lest lead to COM terminal and the red one to V Q Hz terminal 3 Auto range is the original states press RANGE key change to manual range mode 4 When short circuit the test leads at first press REL then test measuring the min resistance please the resistance it will display the actual resistance Note 1 Firstly users should select the knob to the highest range if users had no idea about the range of resistance under test and then select the proper range based on displaying value 1 The LCD displays OL when the resistance is over the selected range The knob should be adjusted to a higher range When measuring value is over 1MQ the reading will take a few seconds to be stable It s normal for high resistance measuring 2 When input terminal is in ope
8. e sound 5 times and turn into sleeping mode 1 minute later the buzzer sound a long voice 1 time the meter will be power off Press any key to restart the power 2 Press DC AC key and then turn on the auto power off function will be cancelled 5 Meter maintenance 1 Don t input the voltage value higher than DC 1000V or AC 750V 2 Don t measuring the voltage at current resistance diode and continuity rage 3 Don t use the meter when the battery isn t install or the back case isn t firm 4 When replacing fuse please take away the test leads from the measuring point and power off at first 5 Keep the meter away from water dust and shock 6 Do not store and operate the meter under the condition of high temperature high humidity combustible explosive and strong magnetic place 7 Wipe the case with a damp cloth and detergent do not use abrasives and alcohol 8 If do not operate for a long time should take out the battery to avoid leakage 9 When symbol displays should replace the battery following the steps 9 1 see picture 2 move holster at first 9 2 Unlock the button and remove the battery case 9 3 Take out the old battery and replace the new one I s better to use alkaline S nan uu J battery for longer life n 9 4 fit on battery case and bolt 9 5 see the picture to fit on the holster 10
9. it will display the frequency or duty cycle of the signal source which is tested Note 1 There is only the auto range mode under the frequency range 2 The meter can still work if the input is higher than 10Vrms but the accuracy is not guaranteed 3 IN noise environment you d better use shield cable to measure a low signal 4 When measuring high voltage circuit any parts of your body should not touch the high voltage circuit 5 Don t input voltage higher than 250V DC or AC peak value or it may damage the meter 4 9 Transistor hFE measuring 1 Select the knob to hFE range 2 Define the transistor is NPN or PNP type insert the emitter base and collector separately to the correct hole the approx value will be displayed on LCD 4 10 Diode and Continuity performance test 1 Insert the black test lead to COM terminal and the red one to V O Hz terminal the polarity of red lead is 4 2 Select the knob to gt range press DC AC key to select the measurement mode connect test leads with the diode under tested 3 Forwarder measuring insert the red test leads connect to diode positive polarity the black test leads to diode cathode polarity the reading is the approx value of diode forward volt drop 4 backward measuring the red test connect to diode cathode polarity the black test leads to diode positive polarity the LCD display OL 5 The complete diode testing include forwa
10. n circuit overload displays OL 3 When measuring in line resistor be sure that the power is off and all capacitors are released completely 4 Do not input any voltage at resistance range even the meter has voltage protection functions at this range 4 7 Capacitance measurement 1 select knob to 4F range 2 insert the black lest lead to COM terminal and the red one to V Q Hz terminal 3 if the LCD doesn t display 0 press REL to clear the reading 4 Select the knob to proper capacitance range and insert the measuring accessories or test leads into COM and VOHz terminal Note the red test leads is for positive poleo LCD displays capacitance value Note 1 Dont input voltage or current to the VQHz terminal when measuring the capacitance or the capacitance isn t away from the Cx terminal 2 In order to assure the accuracy please press REL to clear the reading before testing 3 There is only the auto range mode under the capacitance range 4 The capacitance must be complete discharge before testing 5 The reading of 400uF range delay 15 seconds 4 8 Frequency measurement 1 Insert the black lest lead to COM terminal and the red one to V O Hz terminal 2 select the knob to Hz range insert the test leads or shielded cable to the signal source or the load which is tested 3 Press Hz DUTY key to switch frequency duty cycle
11. pprox 10MQ Overload protection 1000V DC or 750V AC Frequency response 40 200 Hz under 750V other range 40 400 Hz Sine wave RMS Average value response 2 4 DC Current DCA Range Accuracy Resolution 600uA 0 1pA 6000uA 1pA 60mA Dare 10pA 600mA 100A 6A a 1mA 20A HAUTS TOMA MAX measurement voltage drop full range mA 300mV A 100mV Max input current 20A within 15 seconds Over load protection 500mA 250V and 13A 250V fast molten fuse 2 5 AC Current ACA Range Accuracy Resolution 600uA 0 1pA 6000uA a 1pA AOMA 1 2 5 10uA 600mA 100A 6A 5 1mA 20A 2 0 10 TOMA MAX measurement voltage drop full range mA 400mV A 200mV Max input current 20A within 15 seconds Over load protection 500mA 250V and 13A 250V fast molten fuse Frequency response 20A range 40 100Hz other range 40 400Hz 2 6 Resistance Q Range Accuracy Resolution 6000 0 8 5 0 10 6kQ 10 60kQ 100 600kQ a ere 1000 6MQ 1kO 60MQ 1 2 5 10kO Open circuit voltage 600mV Over load protection 250V DC or AC peak value NOTE At range 600 Q short circuit the test leads to measure the wire resistance and then subtracts it from the real measurement Or press REL to clear the wire resistance and read the value directly 2 7 CAPACITANCE C RAN
12. rd and backward measurement if the result isn t meet the above it means the diode is bad DC AC key measurement mode 5 press to select the Continuity 6 Insert test leads to two points of tested circuit if the inner buzzer sounds the resistance is less than 50 10 Q Note 1 Don t input voltage at gt range 2 Make sure be power off and discharge the capacitor any AC signal will make the buzzer sounds 4 11 Temperature measurement 1 Select the knob to C F range 2 Insert Temp socket the cold point of thermocouple to K put the working end temperature measurement end of thermocouple on the surface or inside the object to be tested Then you can read temperature from the screen and the data is in Centigrade press DC AC key to select Fahrenheit the data is in Fahrenheit Note 1 If insert the thermocouple opposited it will display the mistake value when the temperature is rising the value will be down 2 when the input terminal open circuit it will display the normal temperature 3 Don t change the temperature probe optionally or the value accuracy isn t guarantee 4 Don t input voltage at temperature range 4 12 Data holding Press HOLD key presently measured value is held on LCD and HOLD symbol displays press it again the function is cancelled 4 13 Auto power off 1 When the meter stops work about 15 minutes the built in buzzer will b
13. s OL it means meter is over the max Value of this range thus should select the knob to a higher range 2 Do not input a voltage over AC 750V 3 Be carefully while measuring a high voltage DO NOT touch the high voltage circuit 4 When the measuring voltage large than AC750V the built in buzzer will be sounds 4 4 DCA measuring 1 Insert the black test lead to COM terminal and the red one to mA terminal the Max 600mA or to 20A the Max 20A 2 Select the knob to a proper DCA range press DC AC key to select the measurement mode then connect the leads crossly to the electric circuit under test LCD displays polarity and current under test connected by the red test lead Note 1 Firstly users should select the knob to the highest range if users had no idea about the range of current under test and then select the proper range based on displaying value 2 If the LCD displays OL it means the current is over range Now you need to select the knob to the higher 3 Max input current is 600mMA or 20A subject to where the red test lead insert to too large current will damage the fuse 4 5 ACA measuring 1 Insert the black test lead to COM terminal and the red one to mA terminal the Max 600mA or to 20A the Max 20A 2 Select the knob to a proper ACA range press DC AC key to select the measurement mode and connect the leads crossly to the ele
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