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MT873
Digital Multimeter
Introduction
The MT873 multimeter is a slim sized, portable, robust drop proof digital multimeter. The
MT873 has a 6000 count digit LCD monitor with large 25mm digits that offer clear and
easy reading. The circuitry design is centred on large-scale IC A/D converters in
conjunction with an over-load protection circuit, the meters offers excellent performance
and is ideal for a versatile digital multimeter.
The meters can be used to measure DC & AC voltage, DC & AC current, resistance,
capacitor, frequency, duty cycle, temperature, Non Contact AC Voltage (NCV) detection,
diode test and audible continuity. If the equipment is used in a manner not specified by
the manufacturer, the protection provided by the equipment may be impaired.
This Equipment Conforms to UL STD. 61010-1, 61010-2-030 and 61010-2-033; Certified to
CSA STD. C22.2 NO. 61010-1, 61010-2-030 and 61010-2-033.
Panel Layout
2
3
5
7
6
8
11
12
13
1
.
CDS sensor: The CDS sensor can reaction to the ambient brightness range, then
automatically control the LCD backlight to lighten or go out.
2.
NCV detection area: Non Contact AC Voltage (NCV) detection area.
3.
NCV red light: Non Contact AC Voltage (NCV) detection red light.
4.
NCV green light: Non Contact AC Voltage (NCV) detection green light.
5.
LCD display: 6000 counts digit, full function symbol display.
6.
SELECT key: This key work on the "
diode or continuity test, on the voltage or current range, change to DC or AC, on the
°C/°F range, change to °C or °F test; I f press a nd hold SELECT key to power on, "Auto
Power Off " function will be disabled.
7.
RANGE Key: Press the "RANGE" key, the meter enters manual range mode, press it
more than 2 seconds again, return to auto mode.
8.
HOLD key: Press the "HOLD" key to lock display value, and the "DH" sign w ill appear
on the display, press it again to exit.
9.
REL Key: Press the "REL" key, the meter enters relative measuring mode, "REL" is
displayed on the LCD and the present reading becomes the reference value and
displayed on the display. Relative measurement REL
value. Press it again to exit.
10.
Hz/% Key: On "ACV/ACA" or "Hz" range, press the "Hz/%" key, you can choose the
Frequency or Duty Cycle measurement.
11.
Rotary Switch: Use this switch to select functions and ranges.
12.
COM: COM and Temperature "-" Input Jack.
13.
10A: 10A Input Jack
14.
VΩmA: V/μAmA/Hz/Ω
/
15.
Meter casing
16.
Protective casing
Safety Information
1.
The meter is designed according to IEC-61010 concerning e lectronic m easuring
instruments with an over-voltage category 600V (CAT II) or 300V (CAT III) and
pollution 2.
2.
Follow all safety and operating instructions to ensure that the m eter is u sed safely and
is kept in good operating condition.
3.
Safety symbols:
Important safety information, refer to the operating manual.
Dangerous voltage may be presence
Double insulation (protection Class II)
.
" range, press the key to c hoose resistance,
=measurement value-Reference
and Temperature "+" Input Jack
Special Cautions for Operation
1.
The meters can be safe only according to standard procedures w hen used i n conjunction
with the supplied test leads. Please replace damaged test leads with the same
specifications.
2.
To avoid risk of electric shock, do not use the meter if the casing h as been o pened.
3.
The range switch should be in the right position before making a m easurement.
4.
To avoid electric shock and damaging the instrument, the input s ignals must n ot exceed
the specified limits.
5.
When measuring TV set or switched power, attention should be p aid to the p ossible pulses
that may cause damage to the circuitry.
6.
Range switch position must not be changed at random during m easurement.
7.
Take caution against shock in the course of measuring voltage h igher than D C 60V & AC
30V.
8.
Protection fuse should be replaced only with same type and same s pecification.
9.
After using the meter, set function switch to OFF to save battery p ower.
10.
If the meter is not used for a long time, take out battery to avoid d amage b y battery
leakage.
General Specifications
1
.
Max Voltage between input terminal and Earth: CAT II 600V or CAT III 300V
2.
Over-range Indication: display "OL" for the significant digit.
3.
Automatic display of negative polarity "-".
4.
Low Battery Indication: "
5.
Max LCD display: 6000 counts digit.
6.
Auto range & Manual range control
7.
Auto Power Off: When measurement exceeds 15 minutes without c hanging t he mode and
pressing key, the meter will switch to standby mode. Press any key to exit standby mode.
When switching the meter back on, press and hold the SELECT key to disable auto power
off.
8.
Auto LCD backlight
9.
Fuse protection: 600mA/600V Fast Fuse, 10A/600V Fast Fuse
10.
Power supply: 9V 6F22 battery
11.
Operating Temp.: 0
12.
Storage Temp.: -10
1
13.
Guaranteed precision Temp.: 23±5
14.
Dimension: 150 x 100 x 36mm
4
15.
Weight: approx. 250g (including battery)
Testing Specifications
Accuracy is specified for a period of year after calibration and at 18
with relative humidity to 70%.
DC Voltage
Range
9
600mV
6V
10
60V
600V
* Impedance: 10MΩ, More than 100MΩ on 600mV range
* Overload protection: 600V DC or AC RMS
15
AC Voltage (True RMS)
Range
6V
60V
14
600V
* Impedance: 10MΩ
16
* Overload protection: 600V DC or AC RMS
* Frequency Range: 40 to 400Hz
DC Current
Range
600μA
6000μA
60mA
600mA
6A
10A
* Overload protection: 600mA/600V Fast Fuse, 10A/600V Fast Fuse,
10A up to 10 seconds
AC Current (True RMS)
Range
600μA
6000μA
60mA
600mA
6A
10A
Resistance
* Overload protection: 600mA/600V Fast Fuse, 10A/600V Fast Fuse,
10A up to 10 seconds
* Frequency Range: 40 to 400Hz
Range
600Ω
6kΩ
60kΩ
600kΩ
6MΩ
60MΩ
* Overload protection: 600V DC or AC RMS
.
" displayed.
°C
to 40
°C
(relative humidity <85%)
°C
to 50
°C
(relative humidity <85%)
°C
(relative humidity <70%)
Resolution
Accuracy
0.1mV
1mV
±(0.5% of rdg + 2 digits)
10mV
100mV
±(0.8% of rdg + 2 digits)
Resolution
Accuracy
1mV
±(1.0% of rdg + 3 digits)
10mV
100mV
±(1.5% of rdg + 3 digits)
Resolution
Accuracy
0.1μA
1μA
±(1.2% of rdg + 2 digits)
10μA
100μA
1mA
±(2.0% of rdg + 3 digits)
10mA
Resolution
Accuracy
0.1μA
1μA
±(1.5% of rdg + 3 digits)
10μA
100μA
1mA
±(2.5% of rdg + 5 digits)
10mA
Resolution
Accuracy
0.1Ω
±(1.0% of rdg + 3 digits)
1Ω
10Ω
±(1.0% of rdg + 2 digits)
100Ω
1kΩ
10kΩ
±(1.5% of rdg + 3 digits)
°C
to 28
°C
(64
°F
to 82 )
°F