DVM 68 LCD Auto Range Digital Multimeter OPERATION MANUAL GEBRUIKERSHANDLEIDING MANUEL D’UTILISATEUR
DVM 68 LCD Auto Range Digital Multimeter 1. Description Your DVM 68 is a autoranging professional digital multimeter with a 3 ¾ digit LCD display. It is ideally suited for field, lab, shop, and home applications. By using the latest in IC and display technology to significantly reduce the number of discrete internal components, the multimeter gives you superb measuring capability as well as the highest possible reliability.
1.3 Maintenance Your DVM 68 is an example of superior design and craftsmanship. The following suggestions will help you care for the multimeter so you can enjoy it for years : • Keep the multimeter dry. If it gets wet, wipe it dry immediately. • Use and store the multimeter only in normal temperature environments. Temperature extremes can shorten the life of electronic devices or damage batteries. • Handle the multimeter gently and carefully.
2.1 Range Control Button Range for AC/DC voltage, AC/DC current(µA and mA only), Resistance and Frequency measuring can be selected manually or autorange. Push this button as following to choose range the desired mode or range. Power On or Function Changing AutoRanging Push button once "R-H"displayed Push button for over 3 sec. Manual Ranging Push button for less than 1 sec. Range Changed 2.
2.4 Input Jacks This meter has four input jacks that are protected against overload to the limits. During use, connect the black test lead to the COM jack and the red test lead as shown below Function Red Lead Connection DCV / ACV V/Ω/F kHz V/Ω/F V/Ω/F Ω/ / µA / mA mA / Cx nF / µF mA / Cx A A µA/ mA and A ranges are protected by fuses. Input Limits 1000V DC or 750V AC rms 250V DC or AC rms 250V DC or AC rms 300mA DC or AC rms 300mA fuse protected 10A DC or AC rms 3. Operating instructions 3.
Remarks : 1) For resistance above 3.26MΩ, it may take a few seconds to stabilize reading. This is normal for high resistance measuring. 2) When the input is not connected, i.e. at open circuit, the figure "OL" will be displayed for the overrange condition. 3) When checking in-circuit resistance, be sure the circuit under test has all power removed and all capacitors are fully discharged. 3.
3.7 Transistor Test 1) Set the function switch at hFE position. 2) Identify whether the transistor is NPN or PNP type and locate emitter, base and collector lead. Insert leads of the transistor to be tested into proper holes of the testing socket on the front panel. 3) LCD display will show the approximate hFE value at the test condition of base current 10 µA and Vce 3.2V. 4. Specifications Accuracy is specified for a period of one year after calibration and at 18°C to 28°C with relative humidity to 80%.
4.3 AC Voltage Range Resolution Accuracy 3.26V 1mV 32.6V 10mV ± 0.8% of rdg ± 3 digits 326V 0.1V 750V 1V Input impedance : 10MΩ Frequency range : 40 to 1000Hz, 40 to 200Hz at 3.26V range 4.4 DC Current Range Resolution Accuracy 326µA 0.1µA 3260µA 1µA ± 1.2% of rdg ± 3 digits 32.6mA 10µA 326mA 0.1mA 10A 10mA ± 2.0% of rdg ± 5 digits Overload protection : F 300mA fuse for µA and mA ranges, F 10A fuse for A range Burden Voltage 0.5mV / µA 0.5mV / µA 8.0mV / mA 8.0mV / mA 0.02V / A 4.
Range 326nF 32.6µF Resolution 0.1nF 10nF Accuracy ± 3.0% of rdg ± 5 digits 4.8 Frequency Range Resolution Accuracy 32.6kHz 10Hz ± 1.2% of rdg ± 3 digits 150kHz 100Hz ± 2.5% of rdg ± 3 digits Sensivity : 200mV rms up to 50kHz, 1V rms for 50kHz to 150kHz 5. Accessories Test leads Battery (9V) Operation Manual Holster 5.1 How to use the holster The holster is used to protect the meter and to make the measurement more confortable.
If the sign " " appears on the LCD display, it indicates that the battery should be replaced. Remove screws on the back cover and open the case. Replace the exhausted battery with a new one. Fuse rarely needs replacement and blows usually as a result of the operator’s error. Open the case as mentioned above and take the PCB assembly out from the case. Replace the blown fuse with ratings specified.
