Digital Multimeter Technical Characteristics and Panel Operation Instructions
The digital multimeter is a small digital multimeter with three and a half digit LCD display. It can measure AC and DC voltage and AC and DC current, resistance, capacitance, transistor β-value, diode on voltage and circuit shorting, etc., by a rotary band switch to change the function and range of measurement, a total of 30 gears.
The maximum display value of this multimeter is ±1999, it can automatically display "0" and polarity, and display "1" or "-1" when overloaded, and display "1" or "-1" when the battery voltage is too low. When the battery voltage is too low, it displays "←" sign, and short-circuit check with buzzer.
Digital multimeter technical characteristics
1.Measuring range
(1) AC and DC voltage (AC frequency of 45Hz ~ 500Hz);
Range were 200mV, 2V, 20V and 1000 five, DC accuracy of ± (0.8% of the reading + 2 words) below, AC accuracy of ± (1% of the reading + 5 words);
Input impedance, DC grade for 10MΩ, AC grade for 10MΩ, 100PF.
(2) AC and DC current
Range were 200μA, 2mA, 200mA and 10A five-stage, DC accuracy of ± (1.2% of the reading + 2 words), AC accuracy of ± (2.0% of the reading + 5 words), the maximum voltage load of 250mV (AC RMS).
(3) resistance:
The ranges are: 200Ω, 2kΩ, 200kΩ, 20MΩ and 20MΩ six grades. Accuracy is ± (2.0% of the reading + 3 words).
(4) diode conduction voltage:
The range is 0 to 1.5V, and the test current is 1mA±0.5mA.
(5) Triode β value test:
Test conditions are: VCE = 2.8V, IB = 10μA.
(6) Short circuit detection:
Test circuit resistance <20Ω±10Ω 2. Sampling time: TS = 0.4S.
Panel and operating instructions
1. Display
Three and a half digits of the liquid crystal display
2. Power switch
Press, then turn on the power, when not in use should be turned off.
3. Capacitance measurement socket
Measurement of capacitance, the capacitance pin into the socket.
4. Function range switch
Select different measurement functions and ranges.
5．10A current jack (cannot measure current greater than 10A)
When measuring AC and DC currents greater than 200mA and less than 10A, the red pen should be inserted into this 10A current jack.
6. Current jack
When measuring the AC and DC current less than 200mA, the red pen should be inserted into this current jack.
7. V/Ω jack
When measuring AC and DC voltage, resistance, diode conduction voltage and short-circuit detection, the red pen should be inserted into the V / Ω jack.
8. Ground common terminal "COM" jack black pen is always inserted into the grounding jack.
9. β value test socket
The collector of the transistor under test, base and emitter were inserted into the "C", "B", "E" jack, pay attention to distinguish between the transistor is a NPN-type or PNP-type.
