DVM1090 DIGITAL THERMOMETER DIGITALE THERMOMETER THERMOMETRE NUMERIQUE DIGITALES THERMOMETER MULTÍMETRO DIGITAL User Manual Gebruikershandleiding Manuel d’utilisation Gebrauchsanleitung Manual
DVM1090 – DIGITAL MULTIMETER 1. Introduction & Safety Prescriptions Thank you for buying the DVM1090. This digital multimeter has a large LCD, a data-hold function and a backlight. It is ideal for use in open air, workshops and schools and for home and hobby applications. 2. Safety The meter was designed according to IEC-1010 concerning the safety requirements for electronic measuring instruments with an overvoltage category (CAT II) and pollution 2.
DC (direct current) Low battery Fuse buzzer for continuity AC (alternating current) AC or DC (alternating current or direct current) CAD II Overvoltage category II, pollution degree 2 per IEC1010-1 CAT III Overvoltage category III, pollution degree 2 per IEC1010-1 2.2 Maintenance • Do not remove the back cover while a voltage is being applied. Only a qualified technician should handle repairs. • Always disconnect the test leads from all current sources before opening the meter.
. Specifications Max. accuracy is achieved during a one-year period after calibration. Ideal circumstances require a temperature of 18 to 28°C (64 to 82°F) and a max. relative humidity of 75%. 4.1 General Specifications Measuring Method Sampling Time Display Max. Display Polarity Indication Overrange Indication Displayed Measuring Unit Dual-slope integration A/D converter ±0.4sec.
4.2.2. AC Voltage Range 200mV 2V 20V 200V 700V Input Impedance Overload Protection Frequency Range Response Max. Input Voltage Resolution 0.1mV 1mV 10mV 100mV 1V Accuracy ±1.2% of rdg + 5 digits ±1.0% of rdg + 5 digits ±1.0% of rdg + 5 digits ±1.0% of rdg + 5 digits ±1.2% of rdg + 5 digits : 10MΩ : 250V DC or rms AC for the 200mV-range, 1000V DC or 700V rms AC for the ranges 2V to 700V : 40 to 400Hz : average response, calibration in rms of a sine wave.
4.2.5. Resistance Range 200Ω 2kΩ 20kΩ 200kΩ 2MΩ 20MΩ Resolution 0.1Ω 1Ω 10Ω 100Ω 1kΩ 10kΩ Accuracy ±1.0% of rdg ± 3 digits ±1.0% of rdg ± 1 digits ±1.0% of rdg ± 1 digits ±1.0% of rdg ± 1 digits ±1.0% of rdg ± 1 digits ±1.0% of rdg ± 5 digits Open-Circuit Voltage : ±700mV Overload Protection : 250V DC or rms 4.2.6. Capacitance Range 2nF 20nF 200nF 2µF 20µF Resolution 1pF 10nF 0.1nF 1nF 10nF Accuracy ±4.0% of rdg ± 8 digits ±4.0% of rdg ± 3 digits ±4.0% of rdg ± 3 digits ±4.0% of rdg ± 3 digits ±4.
4.2.9. Frequency Range 20KHz Resolution 10Hz Accuracy ±1.5% of rdg + 5 digits Sensitivity : 200mV rms and input no more than 10V rms Overload Protection : 250V rms AC 4.2.10. Transistor hFE Range hFE Function Read the approximate hFE value (0-1000) of the transistor under test (ALL TYPES) from the display 4.2.11. Diode Range Resolution 1mV Function Read the diode’s approximate forward voltage value from the display Forward DC Current : 1mA Reversed DC Voltage : ±2.
5. Operating Instructions 5.1. Using the Data Hold Button Press this button if you want the device to hold the measured value. Press this button again to disengage the data hold button. 5.2. Backlight Press the LIGHT button when it’s getting too dark to read the LCD. The backlight extinguishes automatically after 5 seconds. Using the backlight often will shorten the life of your batteries. The symbol is displayed when the battery voltage is less than 7V.
2. Set the range switch at the desired V-range position. 3. Connect the test leads with the source or load under measurement. 4. Read the measured value from the LCD. The polarity of the red lead connection is also indicated. REMARKS • The LCD displays the overrange indication “1” if the measured value is too high for the range you are using. Select a higher range. • Place the range selector in the highest position if the value to be measured is unknown beforehand. 5.7.
5.9. Measuring AC Current WARNING Deactivate the circuit to be tested before connecting it to the meter. 1. Connect the black test lead with the COM jack and the red test lead with the A jack for current measurements up to 200mA. Move the red lead to the 10A jack for measurements up to 10A. 2. Select the desired A-range with the range switch. 3. Select the AC measuring mode with the DC/AC button. 4. Connect the test leads in series with the load to be measured. 5. Read the value from the LCD.
4. Read the value from the LCD. 5. When frequent capacitance testing is needed you should connect the multifunction socket (included) with the COM & V/Ω/A sockets. Insert the capacitor’s pins in the “+” and “-“ connectors of the multifunction socket. REMARKS • When measuring low capacities, the reading will include the capacity of the measuring leads. However, this will not influence the accuracy of your measurements.
5.15. Diode Test 1. 2. 3. 4. Connect the black test lead with the COM jack and the red test lead with the V jack. Place the range switch in the range position. Connect the red lead with the anode and the black lead with the cathode of the diode to be tested. Read the value from the LCD. REMARKS • The LCD will display the possible forward voltage drop of the diode. • The overrange indication “1” will be displayed if the leads have not been connected properly.
6. Maintenance 6.1. Replacing the battery In order to avoid electroshocks, you should disconnect the test leads before opening the case or the battery compartment. 1. The sign appears on the LCD display when the battery needs to be replaced. 2. Loosen the fixing screw of the case and remove the battery cover on the front panel. 3. Insert the new 9V-battery and replace the battery cover. 6.2. Replacing the Fuse Disconnect all test leads before replacing the fuse in order to avoid electroshocks.
