HTC DM-85T Operation Manual

DM-85T DIGTAL MULTIMETER
CONTENTS
GENERAL DESCRIPTION .................................
SAFETY PRECAUTIONS....................................
FEATURES ................................................
OPERATION INSTRUCTION..............................
MAINTENANCE ..............................
TROUBLE SHOOTING ..............................
General Description
1.
This is a 3 1/2 digital multimeter with high stablility and performance. It uses a LCD with
20mm high figure, which makes the reading clearer and the operation more convenient.
It can test DCV, ACV, DCA, ACA, resistance, capacitance, frequency, NCV, duty cycle,
temperature, diode, and continuity. This meter also designed with functions including
unit symbol display, data hold, lighting, auto range, auto power off and warning
functions. To assure high accuracy and resolution, it adopts integrated circuit 8‐bit
microprocessor and a dual integral A/D conversion as LCD driver, giving high resolution
and high accuracy. It is an ideal tool for labs, factories and radio‐technology.
2. Safety Instructions
The instrument is designed in compliance with IEC1010 standard (safety standard issued
by International Electro technical Committee). Please read the following safety
instructions before operation.
2.1 Check the connection and insulation of test leads to avoid electric shock.
2.2 To avoid electric shock and damage to the meter, do not input voltage exceeding
rated value.
2.3 When measuring voltage higher than DC 60V or AC 40V, please be careful and avoid
electric shock.
2.4 Select correct function and range to avoid wrong operation.
2.5 Move the test leads away from test points when switching to other function.
2.6 Don't input voltage in current terminal.
2.7 Don't make any modification to the circuit. It may damage the meter or jeopardize
safety.
2.8 Safety symbols:
Operation Manual
" " High voltage, " " GND, " " Dual insulation, " " Refer to manual, " " Low
battery indication.
3. Features
3.1 General Characteristics
3.1.1 Display: LCD;
3.1.2 Max display: 6000 (3 5/6 digits, automatic polarity, and unit symbol display);
3.1.3 Measurement method: Analog to digital converter (in micro processor ADC+MCU);
3.1.4 Sampling rate: approx.3 times/sec.
3.1.5 Over‐range display: "OL" displayed.
3.1.6 Low battery indicator: " "
3.1.7 Working environment: (0～40) , relative humidity: <80%
℃
3.1.8 Store condition: (‐10～50) , relative humidity: <80%
3.1.9 Battery: 2 pieces 1.5V battery ("AAA" 7# battery);
3.1.10 Dimension: 140×72×37mm (length x width x height);
3.1.11 Weight: approx. 195g (including battery);
3.1.12 Accessories: test leads, TP01 thermocouple, user manual, holster, gift box, and
2*1.5V batteries.
3.2 Technical Features
3.2.1 Accuracy: ± (a% × reading + digits). To assure accuracy, the ambient temperature
should be (23±5) ℃, relative humidity <75%. One year accuracy is guaranteed since
production date.
3.2.2 DC Voltage（DCV）
Range Accuracy
600mV
6V ±(0.5%+4)
60V
℃
;
Resolution
0.1mV
1mV
10mV