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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
1）LCD Display
2 ） POWER Switch ： Boot Up /
Shutdown
3）Data-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 on， pressing 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
system.
8) mechanical blocking
9） 20A 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
test leads
temperature test probe
3.2 MEASUREMENT SPECIFICATION
Environment :
Temperature : 23℃±5℃ relative humidity : max .75%
3.2.1 DC voltage
Range
Accuracy
200mV
2V
±(0.5% of rdg + 8digits)
20V
200V
±(1.5% of rdg + 8 digits)
1000V
Overload Protection : 1000V DC/700Vrms AC on other ranges.
Input impedance : 10MΩ on all ranges
"
1 piece
1 pair
1 pair
Resolution
100uV
1mV
10mV
100mV
1V
3.2.2 AC voltage
(Average sensing. Calibrated to rms
of sine wave)
Range
Accuracy
2V
±(1.5% of rdg + 10 digits)
20V
200
±(2.5% of rdg +10 digits)
700V
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
±(1.2% of rdg +8 digits)
200mA
±(2.0% of rdg +10 digits)
20A
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
±(1.0% of rdg + 8 digits)
2mA
±(2.0% of rdg + 8 digits)
200mA
±(3.0% of rdg + 15 digits)
20A
Frequency : 40~200Hz
Overload protection : 0.2A /250V fuse, 20A/250V fuse 20A up to 10
seconds
3.2.5 Resistance
Range
±(1.2% of rdg +15 digits)
200Ω
2KΩ
±(0.8% of rdg + 8 digits)
20KΩ
200KΩ
±(2.5% of rdg + 15 digits)
20MΩ
Overload protection :250V DC/250Vrms AC for all range.
3.2.6 Capacitance
Range
±(2.5% of rdg + 25 digits)
2nF
20nF
±(2.5% of rdg + 20 digits)
200nF
2uF
±(2.5% of rdg + 25 digits)
0~100 uF
200uF
100~200
±(6.0% of rdg + 55 digits)
uF
Overload Protection :36V DC/36Vrms AC for all range
3.2.7 Frequency
Range
±(3.0% of rdg + 15 digits)
200kHz
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
±(0.75%of rdg+3 digits)＜400℃
(-20～1000)℃
±(1.5%of rdg +15 digits)≥400℃
K TYPE NiCr-NiSi probe
3.2.9 Transistor hFE test
Range
Description
Display read approx hFE value
hFE
(0~1000) of transistor under test
(NPN and PNP Type )
3.2.10 Diode test and Audible Continuity Test
Range
Description
Display read approximately
forward Voltage of diode .
Built-in buzzer sounds if
resistance is less than 80Ω.
Overload protection: 250V DC/250Vrms AC.
Resolution
1mV
10mV
100mV
1V
Resolution
100uA
10mA
Accuracy
Resolution
Accuracy
Resolution
Accuracy
Resolution
Accuracy
Resolution
Accuracy
Test Condition
Base
approx
Vce approx 3V
Test Condition
Forward DC current
approx 1.5mA
Reversed DC voltage
approximately 3V
Open circuit voltage
approx 3V
1uA
10uA
1uA
100uA
10mA
0.1Ω
1Ω
10Ω
100Ω
10KΩ
1pF
10pF
100pF
1nF
100nF
100Hz
Resolution
1℃
Current
10uA
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