Prokit's Industries 303-150NCS User Manual

OPERATOR’S

INSTRUCTION MANUAL

903-150NAS
903-150NBS
303-150NCS
903-150NDS

For 303-150NCS

DIGITAL MULTIMETER

SAFETY INFORMATION

This multimeter has been designed according to IEC 1010
concerning electronic measuring instruments with an overvoltage
category (CAT II) and pollution 2. Follow all safety and operating
instructions to ensure that the meter is used safely and is kept in
good operating condition. Full compliance with safety standards
can be guaranteed only with test leads supplied. If necessary, they

must be replaced with the type specied in this manual.

SAFETY SYMBOLS

Important safety information, refer to the operating manual.

Dangerous voltage may be present.

Earth ground.

Double insulation (Protection class II).

Fuse must be replaced with rating specied in the manual.

200mA/250V

MAINTENANCE

• Before opening the case, always disconnect test leads from all
energized circuits.

• For continue protection against re; replace fuse only with the
specied voltage and current ratings: F 200mA/250V(Quick

Acting)

• Never use the meter unless the back cover is in place and
fastened completely.

• Do not use abrasives or solvents on the meter. To clean it using
a damp cloth and mild detergent only.

2

DURING USE

• Never exceed the protection limit values indicated in specica­tions for each range of measurement.

• When the meter is linked to measurement circuit, do not touch
unused terminals.

• Never use the meter to measure voltages that might exceed

600V above earth ground in category II installations.

• When the value scale to be measured is unknown beforehand,
set the range selector at the highest position.

• Before rotating the range selector to change functions, discon­nect test leads from the circuit under test.

• When carrying out measurements on TV or switching power

circuits always remember that there may be high amplitude volt­ages pulses at test points, which can damage the meter.

• Always is careful when working with voltages above 60V dc
or 30V ac rms. Keep ngers behind the probe barriers while

measuring.

• Before attempting to insert transistors for testing, always be sure
that test leads have been disconnected from any measurement
circuits.

• Components should not be connected to the hFE socket when
making voltage measurements with test leads.

• Never perform resistance measurements on live circuits.

GENERAL DESCRIPTION

The meter is a handheld 3 1/2 digital multimeter for measuring DC

and AC voltage, DC current, Resistance, Diode, Transistor and
Continuity Test with battery operated.

The Back light of display is optional.

3

Function 903-150NAS 903-150NBS 303-150NCS 903-150NDS

AC Voltage V~ • • • •
DC Voltage V • • • •

DC Current A • • • •
Resistance Ω • • • •
Diode • • • •
Transistor hFE test • • • •
Continuity • • •
Temperature ºC •
HOLD • • • •
BACK LIGHT •

1

4

2

3

5

6

4

7

FRONT PANEL DESCRIPTION

Display

1

3 1/2 digit, 7 segment, 15mm high LCD.

Back light (option)

2

When this button is pushed, the Back light of display is on. After

about 5 seconds, the Back light is self-off. The Back light is on

again, just push this button once.

3

Rotary switch
This switch is used to select functions and desired ranges as

well as to turn on/off the meter.

4

Hold button
When this button is pushed, the display will keep the last reading
and " " symbol will appear on the LCD until pushing it again.

5

"

10A" jack
Plug in connector for red test lead for 10A measurement.
"

COM" jack
Plug in connector for black (negative) test lead. "VΩmA" jack

6
7

Plug in connector for red (positive) test lead for voltage, resis­tance and current (except 10A) measurements.

SPECIFICATIONS

Accuracy is specied for a period of one year after calibration and

at 18 to 28°C(64°F to 82°F) with relative humidity to 80%.

GENERAL

Maximum voltage between

terminals and earth ground : CAT II 600V
Fuse protection : F 200mA/250V
Power : 9V battery, NEDA 1604 or 6F22
Display : LCD, 1999 counts, updates 2-3/sec.
Measuring method : Dual-slope integration A/D converter
Overrange Indication : Only gure "1" on the display
Polarity indication : "-" displayed for negative polarity
Operating Environment : 0 to 40ºC
Storage temperature : -10ºC to 50ºC.
Low battery indication : " " appears on the display
Size : 138mm×69mm×31mm
Weight : Approx.170g.

5

DC VOLTAGE

Range Resolution Accuracy

200mV 100µV ±0.5% of rdg ± 2 digits

2V 1mV ±0.5% of rdg ± 2 digits

20V 10mV ±0.5% of rdg ± 2 digits
200V 100mV ±0.5% of rdg ± 2 digits
600V 1V ±0.8% of rdg ± 2 digits

Overload Protection: 250V rms. For 200mV range and 600V dc

or rms. ac for other ranges.

DC CURRENT

Range Resolution Accuracy
200µA 0.1µA ±1% of rdg ± 2 digits

2mA 1µA ±1% of rdg ± 2 digits
20mA 10µA ±1% of rdg ± 2 digits

200mA 100µA ±1.5% of rdg ± 2 digits

10A 10mA ±3% of rdg ± 2 digits

Overload Protection: F 200mA/250V fuse. (10A range unfused)
*303-150NCS DC 200µA Excepted

AC VOLTAGE

Range Resolution Accuracy

200V 100mV ±1.2% of rdg ± 10 digits

2600V 1V ±1.2% of rdg ± 10 digits

Overload Protection: 600V dc or rms. ac for all ranges.
Frequency range: 40Hz to 400Hz. Response: Average respond-

ing, calibrated in rms. of a sine wave.

DIODE & CONTINUITY(*903-150NAS Excepted)

Range Description

If continuity exists (about less than 1.5kΩ), built-in buzzer

will sound.

Show the approx. forward voltage drop of the diode.

6