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PIN-144 MANUAL
1 Overview
This instrument is a compact, battery operated, handheld 3 1/2
digital multimeter designed for use by technicians, servicemen,
students, and hobbyists who requir an instrument that is accurate,
reliable, and always ready for use. The Dual-slope-A/D converter uses
C-MOS technology for auto-zeroing, polarity selection and over-range
indication. Full overload protection is provided. It is powered by a
standard 9V type battery. Please read this manual before using the
multimeter.
2 Panel Layout
1LCD Display
2 POWER Switch Boot Up /
Shutdown
3Data-hold Switch (HOLD)Pressing
this button, the meter enters the auto
data hold mode and HOLD is
displayed on the LCD.
4 Back Light Button Switch:
Pressing the button turns the
backlight onpressing it again turns
it off.
5) Function switch indicator lamp
6) hFE Input Jack
7) Rotary Switch: use this switch to
select functions and ranges
8) mechanical blocking system.
920A Input Jack, mA Input Jack, V
ΩInput Jack, COM Input Jack
3 SPECIFICATION
3.1 GENERAL CHARACTERISTICS
3.1.1 3 1/2 digit big LCD max. indication 1999.
3.1.2 Auto-Zero & Auto-Polarity .
3.1.3 Overrange: indication of 1 or -1.
3.1.4 Low battery indication:
3.1.5 Power supply : 9V Zinc-carbon battery .
3.1.6 Safety standards :The meter is up to the standards of IEC1010
Double Insulation , Pollution Degree 2 ,overvoltage Category III.
Safety symbols:
important safety information, refer to the operating manual.
Dangerous voltage may be present.
Double insulation (protection Class II)
3.1.7 Mechanical blocking system for terminal sockets to prevent
mistake operation
3.1.8 Temperature for guaranteed accuracy: 23℃±5
3.1.9 Temperature range :
Operating :0 to 40 Storage : -20 to 60
3.1.10 Humidity range :
Operating : max 75%RH Storage: max 80%RH
3.1.11 Size: 190mm×88.5mm×27.5mm
3.1.12 Weight: Approx 320g (including battery).
3.1.13 Accessories : operation manual 1 piece
test leads 1 pair
temperature test probe 1 pair
3.2 MEASUREMENT SPECIFICATION
Environment :
Temperature : 23℃±5 relative humidity : max .75%
3.2.1 DC voltage
Range
Accuracy
Resolution
200mV
±(0.5% of rdg + 8digits)
100uV
2V
1mV
20V
10mV
200V
100mV
1000V
±(1.5% of rdg + 8 digits)
1V
Overload Protection : 1000V DC/700Vrms AC on other ranges.
Input impedance : 10MΩ on all ranges
3.2.2 AC voltage (Average sensing. Calibrated to rms
of sine wave)
Range
Accuracy
Resolution
2V
±(1.5% of rdg + 10 digits)
1mV
20V
10mV
200
100mV
700V
±(2.5% of rdg +10 digits)
1V
Frequency:2V~20V at 40Hz~400Hz; 700V at 40Hz~200Hz
Overload Protection : 1000V DC/700Vrms AC on all ranges.
Input impedance : 1MΩ on 2V range; 10 MΩ on other ranges.
3.2.3 DC Current
Range
Accuracy
2mA
±(0.8% of rdg +8 digits)
20mA
200mA
±(1.2% of rdg +8 digits)
20A
±(2.0% of rdg +10 digits)
Overload Protection :0.2A/250V fuse, 20A/250V fuse 20A up to 10
seconds
3.2.4 AC current (Average sensing. Calibrated to rms of sine
wave )
Range
Accuracy
Resolution
2mA
±(1.0% of rdg + 8 digits)
1uA
200mA
±(2.0% of rdg + 8 digits)
100uA
20A
±(3.0% of rdg + 15 digits)
10mA
Frequency : 40~200Hz
Overload protection : 0.2A /250V fuse, 20A/250V fuse 20A up to 10
seconds
3.2.5 Resistance
Range
Accuracy
Resolution
200Ω
±(1.2% of rdg +15 digits)
0.1Ω
2KΩ
±(0.8% of rdg + 8 digits)
1Ω
20KΩ
10Ω
200KΩ
100Ω
20MΩ
±(2.5% of rdg + 15 digits)
10KΩ
Overload protection :250V DC/250Vrms AC for all range.
3.2.6 Capacitance
Range
Accuracy
Resolution
2nF
±(2.5% of rdg + 25 digits)
1pF
20nF
±(2.5% of rdg + 20 digits)
10pF
200nF
100pF
2uF
1nF
200uF
0~100 uF
±(2.5% of rdg + 25 digits)
100nF
100~200
uF
±(6.0% of rdg + 55 digits)
Overload Protection :36V DC/36Vrms AC for all range
3.2.7 Frequency
Range
Accuracy
Resolution
200kHz
±(3.0% of rdg + 15 digits)
100Hz
Calibrated to the signal of square wave
Sensitivity: 1.0V
Overload protection : 250V DC/250Vrms AC (up to 15 seconds )
3.2.8 Temperature
Scale
Accuracy
Resolution
(-201000)
±(0.75%of rdg+3 digits)400
±(1.5%of rdg +15 digits)400
1
K TYPE NiCr-NiSi probe
3.2.9 Transistor hFE test
Range
Description
Test Condition
hFE
Display read approx hFE value
(0~1000) of transistor under test
(NPN and PNP Type )
Base Current
approx 10uA
Vce approx 3V
3.2.10 Diode test and Audible Continuity Test
Range
Description
Test Condition
Display read approximately
forward Voltage of diode .
Forward DC current
approx 1.5mA
Reversed DC voltage
approximately 3V
Built-in buzzer sounds if
resistance is less than 80Ω.
Open circuit voltage
approx 3V
Overload protection: 250V DC/250Vrms AC.
5


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