DVM890 -- Multifunctional Digital Multimeter
Contents
1. and Earth 1000VDC or 700Vrms AC sine wave Display 3 1 2 digit LCD 2 to 3 readings sec Fuse Protection 200mA range F 0 2A 250V 20A range __ Power Suppl 9V batter Ranging Method manual Polarity Indication is displayed Overrange Indication 1 is displayed automatically DVM890 5 GB 4 2 DC Voltage Range 200mV 2V Input Impedance Battery Low Indication Operating Temperature Storage Temperature Dimensions Weight Resolution 100uV imV 10mV 100mV 10MQ for all ranges E is displayed 0 C to 40 C 10 C to 50 C 88 x 170 x 38mm 340g incl batter Accuracy 0 5 of rdg 1 digit 0 8 of rdg 2 digits Overload Protection 1000V DC or peak AC for all ranges 4 3 AC Voltage Accuracy 1 2 of rdg 3 digits 1 2 of rdg 3 digits Range Resolution 200mV 100uV 2V 1mV 20V 10mV 200V 100mV 700V 1V Input Impedance 10MQ for all ranges Frequency Range 40 to 400Hz Overload Protection 4 4 DC Current 750Vrms or 1000V peak continuous except for the 200mVAC range max 15 sec above 300Vrms Accuracy 0 8 of rdg 1 digit Range Resolution zma___ OA 20mA 10uA 200mA 100uA 20A 10mA 1 2 of rdg 1 digit 2 0 of rdg 5 digits Overload Protection F 0 2A fuse 20A range is not protected by a fuse Max Input Current DVM8902. lt A wiallemon components DVM890 Multifunctional Digital Multimeter Multifunctionele Digitale Multimeter Multim tre digital multifonctions USER MANUAL GEBRUIKERSHANDLEIDING MANUEL D UTILISATION DVM890 Multifunctional Digital Multimeter 1 Introduction Your DVM890 is a professional digital multimeter with a 3 1 2 digit LCD display It is ideally suited for professional academic and home applications The device is equipped with the latest in IC and display technology Thanks to this technology the DVM890 will provide you with precise and reliable measurements for years to come The DVM890 measures DC and AC voltage DC and AC current resistance continuity capacitance frequency and temperatures You can also diodes and transistors hFE 1 1 Warning Be very careful when performing measurements as improper use of this device may result in serious injuries or even death Take all usual precautions for working with electrical circuits and mind the safety prescriptions listed below Do not use this device if you are unfamiliar with electrical circuits and testing procedures This device is not intended for commercial or industrial use 1 2 Safety Prescriptions This multimeter was designed to ensure the safest operation possible Nevertheless safe operation mainly depends on you the user Respect the following safety prescriptions e Never apply more than 1000VDC or 700Vrms AC between an input ja
3. 20A 15 sec GB 4 5 AC Current Range Resolution Accuracy 20mA TOA 1 2 of rdg 3 digits 200mA 100uA 2 0 of rdg 3 digits 20A 10mA 3 0 of rdg 7 digits Overload Protection F 0 2A fuse 20A range is not protected by a fuse Frequency Range 40 to 400Hz Max Input Current 20A 15 sec 4 6 Resistance Range Resolution Accuracy 200Q 0 12 0 8 of rdg 3 digits 2kQ 10 20kQ 102 0 8 of rdg 1 digit 200kQ 1009 2MQ 1kQ 20MQ 10kQ 1 of rdg 2 digits 200MQ 100kQ 5 of rdg 10 digits Range Resolution Accuracy 2000pF 1pF _200 10pF 200nF 100pF 2 5 of rdg 5 digits 2 dF 20uF 10nF 4 8 Temperature Range Temperature Range Resolution Accuracy 50 C to 400 C 0 75 ofrdg 3C T 400 C to 1000 C 1 C 1 5 of rdg 15 C x x 0 C to 40 C 29 Using a K type thermocouple probe xx Using the built in temperature sensor 4 9 Frequency Range Resolution Accuracy 20kHz 10Hz 1 of rdg 1 digit Overload Protection AC 220Vrms DVM890 7 GB 5 Accessories set of test leads K type thermocouple 400 C 1 battery of 9V 1 user manual 1 holster 1 adapter for capacitance measurements 5 1 How to use the holster The holster protects the device and ensures comfortable operation Consult the figures below 1 Use one of the two suppor
4. ck and ground e Use extreme caution when working with voltages in excess of 60VDC or 30Vrms AC e Always discharge the filter capacitors in a power supply circuit before attaching the test leads e Never connect a voltage source to the DVM890 when it is in current DCA or ACA mode resistance or continuity mode e Always turn off the power and disconnect the test leads prior to replacing the battery or fuse e The user should only operate the multimeter when the back cover is in place and securely fastened e When carrying out measurements on TVs or switching power circuits you should always remember that high voltage pulses may occur at the test points These pulses may damage the meter 1 3 Maintenance Your DVM890 is an example of superior design and craftsmanship The following suggestions will help you keep the device in perfect working order e Do not expose the device to water Wipe it dry immediately if it should get wet e Use and store the multimeter under normal temperatures Extreme temperatures may shorten the life of the device or damage the battery e Handle the multimeter with care Dropping it may damage the circuit boards or the housing and may cause the DVM890 to malfunction e Replace an old or weak battery with a fresh one of the required size and type Remove the battery during long periods of inactivity This will protect the multimeter from possible leakage e Disconnect the test probes prior to opening the hou
5. ot connected or if the resistance being measured exceeds the max value of the selected range Disconnect the circuit to be tested and make sure that all capacitors are fully discharged before measuring the in circuit resistance 3 6 Measuring Capacitance 1 Connect the test capacitor to the Cx input connection 9 in figure on p 2 Do NOT connect the capacitor to one of the 4 input jacks viz 10A mA COM or VQHz jack 2 Select the Cx range with the FUNCTION switch Remarks Do not connect an external voltage to the input terminal Discharge capacitors before connecting them Units 1pF 10 uF 1nF 10 uF 3 7 Testing Diodes amp Continuity Connect the black test lead to the COM jack and the red test lead to the VQHz jack 2 Select the Y range with the FUNCTION switch and connect the test leads 3 Connect the red test lead to the anode and the black test lead to the cathode of the diode to be tested 4 For continuity tests connect the test leads to two random points of the circuit to be tested The incorporated buzzer is activated if the resistance between the two test leads is lower than 300 DVM890 4 GB 3 8 Transistor Test hFE Select the hFE range with the FUNCTION switch 2 Determine whether the transistor is of the NPN or PNP type and locate the emitter the base and the collector Insert the leads into the proper holes in the socket on the front
6. ove the red test lead to the 10A jack for measurements of max 20A for max 15 sec at a stretch 2 Select the A range with the FUNCTION switch 3 Connect the test leads IN SERIES with the load under measurement 4 The polarity of the red test lead and the measured current are displayed on the LCD Remark Set the FUNCTION switch to the highest range and gradually work your way down if the current range is unknown beforehand DVM890 3 GB 3 4 Measuring AC Current 1 Connect the black test lead to the COM jack and the red test lead to the mA jack for measurements of max 200mA Move the red test lead to the 10A jack for measurements of max 20A for max 15 sec at a stretch 2 Select the A range with the FUNCTION switch 3 Connect the test leads IN SERIES with the load under measurement 4 The measured current is displayed on the LCD Remark Set the FUNCTION switch to the highest range and gradually work your way down if the current range is unknown beforehand 3 5 Measuring Resistance 1 Connect the black test lead to the COM jack and the red test lead to the VQHz jack 2 Select the appropriate 2 range with the FUNCTION switch and connect the test leads with the load to be measured Remarks The meter may need a few seconds to produce a stable reading for resistance measurements in excess of 1MQ The overrange indication 1 will appear on the display if the input is n
7. panel 3 The display will show the approximate hFE value at the moment of testing Base current 10uA Vce 2 8V 3 9 Measuring Temperature 1 Measure temperatures with the K type thermocouple select the T range with the FUNCTION switch and insert the plug of the K thermocouple in the green K PROBE socket 2 The ambient temperature will be displayed in C if the T range is selected without connecting the K thermocouple Remark Do not hesitate to push firmly in order to insert the temperature probe in the socket 3 10 Measuring Frequency 1 Connect the black test lead to the COM jack and the red test lead to the VQHz 2 gt the KHz range with the FUNCTION switch and connect the test leads to the source or load to be tested Remarks Do not apply more than 220Vrms to the input Use shielded cable for measuring a weak signal in a noisy environment 3 11 Automatic Power off 1 The device will be deactivated automatically when the FUNCTION and RANGE switch has not been used for 15 minutes This energy saving feature extends the life of your battery 2 The meter will be reactivated if the FUNCTION and RANGE switch is turned or if the power switch is pressed again 4 Specifications Maximum accuracy is guaranteed for a one year period after calibration Ideal circumstances require a temperature of 23 C 5 C and a max relative humidity of 75 4 1 General Max Voltage between Terminal
8. s depending on the required function DVM890 2 GB FUNCTION _ RED LEAD CONNECTION INPUT LIMITS 20A for max 15 seconds 200mV VOHz 250V DC or rms AC V amp V VOHz 1000V DC 700V AC sine wave H VoH 250V DCorrms AC Q VQHz 250V DC or rms AC So VQHz 250V DC or rms AC 200mA DC or rms AC 10A amp 20A A 10A DC or rms AC continuous 3 Operating instructions 3 1 Measuring DC Voltage 1 Connect the black test lead to the COM jack and the red test lead to the VQHz jack 2 Select the appropriate V range with the FUNCTION switch and connect the test leads to the source or load to be tested 3 The measured value and the polarity of the red test lead are displayed on the LCD Remark Set the FUNCTION switch to the highest range and gradually work your way down if the voltage range is unknown beforehand 3 2 Measuring AC Voltage 1 Connect the black test lead to the COM jack and the red test lead to the VQHz jack 2 Select the appropriate V range with the FUNCTION switch and connect the test leads to the source or load to be tested 3 The measured value appears on the LCD display Remark Set the FUNCTION switch to the highest range and gradually work your way down if the voltage range is unknown beforehand 3 3 Measuring DC Current 1 Connect the black test lead to the COM jack and the red test lead to the mA jack for measurements of max 200mA M
9. sing DVM890 1 GB e A blown fuse should be replaced with an identical one F F 0 2A 250V e Do not use this device in case of malfunction or if anomalies are detected Have it repaired by qualified personnel e Do notuse the multimeter unless the back cover is in place and fully fastened e Use a soft cloth and a mild detergent for cleaning purposes Never use abrasives or solvents on the meter 2 Description of the Front Panel 1 LCD display 2 Power ON OFF button 3 Capacity input sockets 4 20A MAX jack 5 mA jack 6 COM jack 7 VQHz jack O 8 Temperature probe jack 9 RANGE and FUNCTION switch 10 Transistor test socket 2 1 Range and Function Selector This rotary switch is used to install the various functions and each of the 32 ranges 2 2 Power Switch This push button activates and deactivates the device The DVM890 is also equipped with an energy saving feature the meter is automatically deactivated when the RANGE and FUNCTION selector has not been used for 15 minutes The user will have to press the ON OFF button twice to switch the device on again when the energy saving feature has deactivated the DVM890 2 3 Input Jacks The DVM890 is equipped with 4 input jacks that are protected against overload The limit values are listed in the table below The black test lead should be connected to the COM jack The red test lead should be connected to one of the other three input jack
10. ts to place the device on a table or a desk fig A amp B 2 Hang the meter on the wall using the smaller of the two supports fig C remove the smaller support and insert it in the slots at the top of the holster Use the support to hang the device on a nail in the wall 3 Each of the two supports in fig D can hold a test lead Fig C 6 Replacing the Battery and the Fuse The E symbol appears when the battery needs to be replaced Proceed as follows 1 Disconnect the test leads from all live sources switch off the device and remove the test leads from the input terminals BEFORE opening the housing This is necessary in order to avoid the risk of electroshocks 2 Remove the screws in the back cover and retrieve the battery 3 Insert a new 9V battery NEDA1604 or IEC6F22 4 Replace the cover and tighten the screws The fuse rarely needs to be replaced and a blown fuse is nearly always due to an error on behalf of the operator Open the housing see above and replace the blown fuse with an identical one F F 0 2A 250V DVM890 8 GB
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