HP-760C
OPERATION MANUAL
3 1/2 DIGITAL
MULTIMETER
1
．
INTRODUCTION
This instrument is a compact
、
battery operated
、
handheld 3
1/2 digital multi meter 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 multi meter.
2
．
Panel Layout
1
）
LCD Display
2
）
POWER Switch
：
Boot Up / Shut down
3
）
Back Light /Function switch indicator lamp key: Pressing the
button turns the backlight and the function switch indicator lamp
on
，
pressing it again turns
they off.
4
）
CX+
、
CX- Input Jack
5
）
LX+
、
LX- Input Jack
6
）
Function switch indicator lamp
7)
hFE
Input Jack
8) Rotary Switch: use this switch to select functions and ranges
9) mechanical blocking
system.
10
）
V Ω Input 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.
3.1.3 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 Auto power off: Appox.30 minutes after power on, the meter
automatically enter to power off mode. Push the “POWER” then
push down it, power on again.
3.1.7 Safety standards :The meter is up to the standards of
IEC1010 Double Insulation , Pollution Degree 2 ,over voltage
Category
Ⅲ
.
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
packing 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)
100
μ
V
20V
10mV
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. calibreated to rms
of sine wave)
Range
Accuracy
Resolution
2V
±
(1.5% of rdg + 10 digits)
1mV
20V
10mV
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 : 10 M
Ω
on all 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
±
(1.8% 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
20M
Ω
±
(2.5% of rdg + 15 digits)
10k
Ω
Overload protection:250V DC/250Vrms AC for all range.
3.2.6 Capacitance
Range
Accuracy
Resolution
20nF
±
(2.5% of rdg + 25 digits)
10pF
200nF
±
(2.5% of rdg + 20 digits)
100pF
2
μ
F
1nF
200
μ
F
0~100
μ
F
±
(2.5% of rdg + 25 digits)
100nF
100~200
μ
F
±
(6.0% of rdg + 55 digits)
Overload Protection :36V DC/36Vrms AC for all range
3.2.7 Inductance
Range
Accuracy
Resolution
20mH
±
(2.5% of rdg + 25 digits)
10
μ
H
200mH
100
μ
H
2H
1mH
20H
10mH
3.2.8 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)
3.2.9 Temperature
Range
Accuracy
Resolution
℃
-20
～
150
℃
3
℃
+2
1
℃
150
～
300
℃
3.0% of rdg+2 digits
1
℃
300
～
1000
℃
3.5% of rdg+10 digits
1
℃
K TYPE NiCr-NiSi probe
3.2.10 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
3.2.11 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
2. The mark or sign
“ ”
near to the test lead jacks is for warning
that the input voltage or current should not exceed the indicated
