DVM990BL DIGITAL MULTIMETER OPERATING MANUAL MULTIMETRE DIGITAL MANUEL D’UTILISATION DIGITALE MULTIMETER BEDIENINGSHANDLEIDING DIGITALES MULTIMETER BEDIENUNGSANLEITUNG MULTÍMETRO DÍGITAL MANUAL DEL USUARIO
1. SAFETY INFORMATION WARNING To ensure safe operation, and in order to exploit to the full functionality of the meter, please follow the directions in this section carefully. This multimeter has been designed according to IEC-1010 for electronic measuring instruments, with an overvoltage category CAT II and pollution category 2. Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good operating condition. 1.1. PRELIMINARY 1.1.1.
1.2.6. Before rotating the range selector to change functions, disconnect the test leads from the circuit under test. 1.2.7. Never connect the meter leads across a voltage source while the function switch is in the current, resistance, diode or continuity mode. Doing so can damage the meter. When doing measurements on TV or power switching circuits always remember that there may be high amplitude voltage pulses at test points which can damage the meter. 1.2.9.
2. DESCRIPTION 2.1.
2.2. FUNCTION AND RANGE SELECTOR - 3. This meter is a portable professional measuring instrument with a large LCD and back light for easy reading. This meter has built-in protection to prevent the test leads being connected incorrectly. The input socket for the red test lead senses the correct functions and ranges. When the rotary switch cannot be turned, do not force it as it means that the selected range isn’t suitable for what the red lead is connected to.
3.2. ELECTRICAL SPECIFICATIONS Ambient temperature: 23 ± 5°C Relative humidity: < 70% 3.2.1. DC Voltage Range Resolution Accuracy (% reading + digits) 200mV 0.1mV ± (0.5% of rdg + 1 digit) 2V 1mV ± (0.5% of rdg + 3 digits) 20V 10mV ± (0.5% of rdg + 3 digits) 200V 100mV ± (0.5% of rdg + 3 digits) 1000V 1V ± (0.
3.2.3. DC Current Range Resolution Accuracy (% reading + digits) 2mA 1µA ± (1.0% of rdg + 3 digits) 20mA 10µA ± (1.0% of rdg + 3 digits) 200mA 100µA ± (1.5% of rdg + 5 digits) 10A 10mA ± (2.0% of rdg + 10 digits) Overload protection: 2mA to 200mA ranges: F1: F 200mA/250V fuse 10A range: F2: F 10A / 250V fuse Max. input current: mA socket: 200mA 10A socket: 10A (less than 15 seconds) Voltage drop: 200mV 3.2.4. AC Current Range Resolution Accuracy (% reading + digits) 2mA 1µA ± (1.
NOTE: With the 200 Mohm range, if the input is short circuited, the display will read 1Mohm. This 1Mohm should be subtracted from the measured results. 3.2.6. Capacitance Range Resolution Accuracy (% reading + digits) 2nF 1pF ± (4.0% of rdg + 3 digits) 20nF 10pF ± (4.0% of rdg + 3 digits) 200nF 0.1nF ± (4.0% of rdg + 3 digits) 2µF 1nF ± (4.0% of rdg + 3 digits) 20µF 10nF ± (4.0% of rdg + 3 digits) Overload Protection: 250V DC or rms AC 3.2.7.
3.2.10. Temperature Range Resolutio n Accuracy (% reading + digits) -20°C -20°C to 0°C ± (5.0% of rdg + 5 digits) to 1°C 0°C to 400°C ± (1.0% of rdg + 3 digits) 1000°C 400°C to 1000°C ± (2.0% of rdg + 3 digits) Overload Protection: 250V DC or rms AC 4. OPERATING INSTRUCTIONS 4.1. DATA HOLD If you want data hold when measuring, press "H" and it will hold the reading. Press the button again to remove data hold. 4.2. BACK LIGHT In poor lighting conditions, press " reading easier.
4.4. MEASURING VOLTAGE 4.4.1. Connect the black test lead to the COM socket and the red test lead to the V/Ω socket. 4.4.2. Set the rotary switch to the desired V or V range. 4.4.3. Connect the test leads across the source or load under test. 4.4.4. You can see the reading on the LCD. The polarity of the red lead will be indicated along with the voltage value when making DC voltage measurements. NOTE: 1.
4.6. MEASURING RESISTANCE 4.6.1. Connect the black test lead to the COM socket and the red test lead to the V/Ω socket. 4.6.2. Set the rotary switch to the desired Ω range. 4.6.3. Connect the test leads across the resistance under measurement. 4.6.4. You can see the reading on the LCD. NOTE: 1. When only the figure "1" is displayed, it indicates an over range situation and the higher range has to be selected. 2.
NOTE: 1. 2. 4.8. At the low capacitor range, the reading will include the small residual value of the test leads. It will not influence the accuracy of the measurement. It takes time for the reading to become steady when measuring a high capacitance. MEASURING TEMPERATURE 4.8.1. Set the rotary switch to the °C position. 4.8.2. The 'LCD' display will show the current ambient temperature. 4.8.3. To measure temperature with a thermocouple, the temperature probe for this meter can be used.
NOTE: 1. 2. The meter will show the approximate forward voltage drop of the diode. If the lead connection is reversed, only the figure "1" will be displayed. 4.11. CONTINUITY TEST 4.11.1. Connect the black test lead to the COM socket and the red test lead to the V/Ω socket. 4.11.2. Set the rotary switch to the position. 4.11.3. Connect the test leads across two points of the circuit under test. 4.11.4. If there is continuity (i.e. resistance less than about 70Ω), the built-in buzzer will sound.
5.2. FUSE REPLACEMENT WARNING To avoid electric shock, remove the test leads from the circuit under test before replacing the fuse. For continued protection, only replace fuses with specified ratings: F1: F 200mA/250V F2: F 10A/250V. 5.2.1. Fuses rarely need replacing and almost always blow as a result of operator error. 5.2.2. Loosen the screw fixing the case and remove it. 5.2.3. Replace the blown fuse with the specified ratings. 5.2.4. Put back the case. 5.3.
6. ACCESSORIES 6.1. SUPPLIED WITH THE MULTIMETER • • • • • • 6.
