760A
OPERATION MANUAL
3 1/2 DIGITAL
MULTIMETER
1
．
INTRODUCTION
This instrument is a compact
、
battery operated
、
handheld
3 1/2 digital multimeter designed for use by technicians
、
servicemen
、
students
、
and hobbyists who required 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
transistor radio type battery .please read this manual that
describes various useful message before using the multimeter.
2
．
Panel Layout
1
）
LCD Display: 3½ digits, LCD digit height 27mm
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/ Function switch indicator lamp key: Pressing the
button turns the backlight and the function switch indicator lamp
on
，
pressing it again turns them 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.
9
）
V ΩInput Jack
、
20A Input Jack
、
mA Input 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.
31.3 Over range: 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 ,over voltage
Category
Ⅲ
.
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).
31.13 Accessories:
operation manual 1 piece
test leads 1 pair
color gift box 1 piece
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 : 10M
Ω
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
200V
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 : 1M
Ω
on 2V range; 10 M
Ω
on other ranges.
3.2.3 DC Current
Range
Accuracy
Resolution
2mA
±
(0.8% of rdg +8 digits)
1
μ
A
20mA
10
μ
A
200mA
±
(1.2% of rdg +8 digits)
100
μ
A
20A
±
(2.0% of rdg +10 digits)
10mA
Overload Protection:0.2A/250V fuse 20A/250 fuse 20A up to
10 seconds
3.2.4 AC curren
t (Average sensing. Calibrated to rms of sine
wave)
Range
Accuracy
Resolution
2mA
±
(1.0% of rdg + 8 digits)
1
μ
A
200mA
±
(2.0% of rdg + 8 digits)
100
μ
A
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
200
Ω
±
(1.2% of rdg +15 digits)
0.1
Ω
2k
Ω
±
(0.8% of rdg + 8 digits)
1
Ω
20k
Ω
10
Ω
200k
Ω
100
Ω
2M
Ω
1k
Ω
20M
Ω
±
(2.5% of rdg + 15 digits)
10k
Ω
200MΩ
±【5.0% of （
rdg
-10）+ 30
digits
】
100kΩ
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
2
μ
F
1nF
20
μ
F
10nF
Overload Protection :36V DC/36Vrms AC for all range
3.2.7 Transistor hFE test
Range
Description
Test Condition
hFE
Display read approx .hFE value
(0~1000) of transistor under test
(NPN and PNP Type )
Bast
Current
approx 10
μ
A
Vce approx 3V
3.2.8 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 80
Ω
.
Open circuit voltage
approx 3V
Overload protection: 250V DC/250Vrms AC.
4. HOW TO USE THE MULTIMETER
PRELIMINARY NOTE:
1. If the battery is weak. a
“ ” sign will appear on display. The
battery should be replaced
