omu system NMM830 mini Instruction Manual

Instruction Manual
1. General
The instrument is a pocket digital multimeter, which is used to measure DCV, ACV, and DCA, resistance, diode
and continuity test. It is an ideal tool for labs, household and wireless enthusiasts.
2. Safety notes
1. Do not input a limit value over the range when measuring.
2.When measuring voltage higher than 36V DCV, 25V ACV, check the connection and insulation of the test
leads to avoid electric shock.
3.Keep the test leads away from the testing point when converting function and range.
4.Don't add voltage to the input terminal when measuring resistance.
3. Specification
1. General specifications
1-1. Displaying: 22mm digit height LCD display.
1-2. Max. Indication: 1999 (31/2) auto polarity indication.
1-3. Sampling rate: approx. 3 times/ sec
1-4. Over Range Indication: MSD displays "1"
1-5. Low Battery Indication: " "
1-6. Operation Environment: (0～40)℃, relative humidity ＜80%
1-7. Power: 9V battery (NEDA1604/6F22 or equivalent)
1-8. Measurement: 145×85×30mm (Length×Width×Height)
1-9. Weight: Approx. 170g (including a 9V battery)
1-10. Accessories: Operation Manual, Product Certificate, Packing box, Test leads and a 9V battery.
2. Technical specification
Accuracy: ± (a%×reading+d)
Surrounding: (23±5)℃, relative humidity <75%
2.1 DCV
Range Accuracy
200mV
2V
± (0.5%+4)
20V
200V
600V ± (1.0%+5)
Input impedance: 1MΩfor all ranges.
2.2ACV
Range Accuracy
200V
± (1.2%+10)
600V
Input impedance: 1MΩ
Frequency Response: (40～200)Hz
DIGITAL MULTIMETER
Resolution
100uV
1mV
10mV
100mV
1V
Resolution
100mV
1V
NMM830 mini
2.3 DCA
Range Accuracy
20uA
200uA
2mA
± (1.5%+3)
20mA
200mA
± (2.0%+5)
10A
Max. Input current: 10A (no more than 6 seconds)
Overload Protection: 0.2A/250V; 10A/250V fuse
2.4 Resistance
Range Accuracy
200Ω ± (0.8%+5)
2kΩ
20kΩ ± (0.8%+3)
200kΩ
20MΩ ± (1.0%+15)
Overload Protection: 250V DC/AC peak value
Note: At range 200Ω, first short-circuit the meter pens to measure the wire resistance. Then subtract it from
the real measurement.
2.5 Diode and continuity test
2.4.
Range Display
Forward voltage drop of diode
Buzzer makes a long
sound while resistance is
less than (70±20)Ω
Overload Protection: 250V DC/AC peak value
2.6 DC Voltage Measurement
1. Apply the black test lead to "COM" terminal and the red test lead to "V/Ω" terminal.
2. Set the knob to a proper DCV range, and connect the test leads crossly to the electric circuit under test.
LCD displays polarity and voltage under test connected by the red test lead.
Nota: Firstly, the knob should be set to the highest range if users have no idea about the range of voltage
under test. Then select the proper range based on display value.
Resolution
0.01uA
0.1uA
1uA
10uA
100uA
10mA
Resolution
0.1Ω
1Ω
10Ω
100Ω
10kΩ
Testing condition
Forward DCA
is aprox. 1mA
Backward voltage is apporx.3V
Open voltage is approx.3V