Technical characteristics of DT830 digital multimeter
DT830 digital multimeter is a small digital multimeter with three and a half digits liquid crystal display, which can measure AC and DC voltage, AC and DC current, resistance, capacitance, transistor 6 value, diode conduction voltage and circuit short circuit, etc. The measurement is changed by the rotary band switch There are 30 gears in total for functions and ranges. The maximum display value of DT830 digital multimeter is ±1 999, which can automatically display “0” and polarity. When overloaded, it displays “1” or “-1”. When the battery voltage is too low, it displays the “-” sign. It is used for short circuit check. buzzer.
Precautions for DT830 digital multimeter
(1) Correctly select the range and red test lead socket.
When measuring an unknown quantity, the range should be adjusted to the maximum first, and then adjusted from large to small, until it is suitable for this purpose. If it displays “1”, it means overload, and the range C should be increased
(2) When not measuring, turn off the power at hand.
(3) When changing the range, the test lead should be disconnected from the measured point.
(4) When measuring current, avoid overloading.
(5) It is not allowed to use electricity blocking and current blocking to measure voltage.
6<r the quality level of the method
Technical characteristics of DT830 digital multimeter
1. Measuring range
(1) AC and DC voltage (AC frequency is 45-500 Hz); the ranges are 2 000 mV, 200 mV, 2 V, 20V and I 000 V five gears, and the DC accuracy is ± (0.8% of reading + 2 digits) ), AC accuracy is soil (1% of reading +5 words); input impedance, DC block is 10MQ, AC block is 10 MQ, 100 pF.
(2) The AC and DC current ranges are 200 pA, 2000 v A, 2 mA, 200 mA, and 10 A. The DC accuracy is ± (1.2% of reading + 2 words), and the AC accuracy is ± (of reading). 2. 0% +5 words), the maximum voltage load is 250 mV (AC effective value).
(3) Resistance: The range is 200 respectively. , 2 k. , 200 kQ, 2 M. And 20 M. Five gears. The accuracy is soil (2.0% of reading + 3 words).
(4) Diode conduction voltage: the range is 0~1.5V, and the test current is 1mA ±0.5 mA.
(5) Triode B value detection: the test condition is 〃=2.8V, /R = 10 ^Ao
(6) Short-circuit detection: ①The resistance of the test circuit is less than 20. ±100; ②Sampling time: rs=0.4 so
2. Panel and operating instructions
The DT83OB digital universal surface board is shown in Figure 1.2.1.
(1) Display: Three and a half digit LCD display.
(2) Power switch: Press it to turn on the power, and turn it off when not in use.
(3) Capacitance measurement socket: When measuring capacitance, insert the capacitor pin into the socket.
(4) Function range switch: select different measurement functions and ranges.
(5) 10 A current jack: Cannot measure current greater than 10 A. When measuring AC and DC currents greater than 200 mA and less than 10 A, the red test lead should be inserted into the 10 A current jack.
(6) Current jack: When measuring AC and DC currents less than 200 mA, the red test lead should be inserted into this current jack.
(7) V/. Jack. When measuring AC and DC voltage, resistance, diode conduction voltage and short circuit detection, the red test lead should be inserted into this V/. Jack.
(8) Grounding common terminal “COM” jack: The black test lead is always inserted into this grounding jack.
(9) Triode socket: Insert the collector, base and emitter of the tested triode into the “c”, “B” and “E” sockets, and pay attention to distinguish whether the triode is NPN type or PNP type.
