Morris 57030 Operator's Manual

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Model 57030 OPERATOR’S

INSTRUCTION MANUAL

DIGITAL MULTIMETER

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SAFETY INFORMATION

This multimeter has been designed according to IEC−1010 concerning electronic measuring instruments with an overvoltage category (CATⅡ ) and pollution 2. Follow all safety and operating instructions to ens ure that the meter is used safely and is kept in good operat ing c o ndit ion. Full compliance with safety standards can be guaranteed only with test leads supplied. If necessary, they must be replaced with the type specified in this manual.

SAFETY SYMBOLS

Important safety information, refer to the operating manual.

Dangerous voltage may be present.

Earth ground.

Double insulation (Protection class I I ).

Fuse must be replaced with rating specified in the manual.

MAINTENANCE

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Before opening the case, always disconnect test leads from all energized circuits. For continue protection against fire; replace fuse only with the specified voltage

and current ratings:

F 200mA/250V(Quick Acting)

Never use the meter unless the bac k cover is in place and fastened completely. Do not use abrasiv

es or solvents on the meter. Clean

using a damp cloth and mild detergent only.

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DURING USE

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Never exceed the protection limit values indicated in specifications for each range of m eas ur em ent . When the meter is linked t o measurement c ircuit, 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, set the range selector at the highest pos it io n. Before rotating the range selector t o change functions, disconnect test leads from t h e c irc uit u nder te s t . When carrying out measurement s on a TV or switching power circuits, always remember that t here may be high amplitude voltage pulses at test points, which can damage the meter. Always is careful when working with voltages abov e 60V dc or 30V ac rms. Keep fingers behind the probe barriers while measuring. Before attempting to insert trans istors for tes ting, 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 meas ur em ent s on li ve circuits.

GENERAL DESCRIPTION

The meter is a battery operated handheld 31/2 digital multimeter for measuring DC and AC voltage, DC current, Resistance, Diode, Transistor and Continuity Test.

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FRONT PANEL

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FRONT PANEL DESCRIPTION









  

Display 3 1/2 digit, 7 segment, 15mm high L CD. Back light When this button is pushed, the Back l ight of display is on. After about 5 seconds, the Bac k light is self -off. The Back light is on again after pushing this button once. Rotary switch This switch is used to select functions and desired ranges as well as to turn on/off the meter. 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. “10A” jack Plug in red test lead connector for 10A m eas ure m ent . “COM” jack Plug in connector for black (negative) test lead. “VΩmA” jack Plug in connector for red (positive) test lead for v oltage, resistance and current (except 10A) mea s urem ent s.

SPECIFICATIONS

Accuracy is specified for a period of one year after calibration and at 18 to 28℃ (64°F to 82°F) with relative humidity to 80%.

GENERAL

Maximum voltage between terminals and earth ground

:CATⅡ 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 figure “1” on the display

Polarity indication

:“-”displayed for negative polarity

Operating Environment

:0 to 40℃

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Storage temperature

:-10℃ to 50℃.

Low battery indication :“ ”appears on the display

Size

:138mm×69mm×31mm

Weight

: Approx.170g.

DC VOLTAGE

Range

Resolution

Accuracy

200mV

100µV

±0.5% of rdg ± 2 digits

1mV

0.5% of rdg ± 2 digits

20V

10mV

±0.5% of rdg ± 2 digits

200V

100mV

0.5% of rdg ± 2 digits

600V

±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 f us e. (10A range unfused)

AC VOLTAGE

Range

Resolution

Accuracy

200V

100mV

1.2 % of rdg ± 10 digits

600V

±1.2 % of rdg ± 10 digits

Overload Protection: 600V dc or rm s . ac f or al l ranges . Frequency range: 40Hz to 400Hz. Response: Average responding, calibrated in rms. of a s ine wave.

DIODE & CONTINUITY

Range

Description

If continuity exists (about less t han 1.5kΩ), built-in

buzzer will sound.

Show the approx. forward voltage drop of the diode.

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Overload Protection: 250V dc or rms. ac.

RESISTANCE

Range

Resolution

Accuracy

200Ω

0.1Ω

±0.8% of rdg ± 3 digits

2kΩ

1Ω ±0.8% of rdg ± 2 digits

20kΩ

10Ω

0.8% of rdg ± 2 digits

200kΩ

100Ω

±0.8% of rdg ± 2 digits

2MΩ

1kΩ

1.0% of rdg ± 2 digits

Maximum Open Circuit Voltage: 3.2V Overload Protection: 250V dc or rm s . ac f or al l ranges .

TRANSISTOR hFE TEST (0-1000)

Range

Test Range

Test Current

Test Voltage

NPN & PNP

0-1000

Ib=10µA

Vce=3V

OPERATING INSTRUCTIO NS DC VOLTAGE MEASUREME NT

Connect the red test lead to the “V.Ω.mA” jack and the black lead to the “COM” jack. Set rotary switch at desired DCV position. If the v oltage to be measured is not known beforehand, set range switch at the highest range pos ition and then reduce it until satisfactory resolution is obt ai ned. Connect test leads across the source or load being measured. Read voltage value on the LCD display along with the

polarity of the red lead connection.

DC CURRENT MEASUREMENT

Connect the red test lead to the “V.Ω.mA” jack & the black test lead to “COM” jack. (For measurements between 200mA & 10A, remove red lead to“10A” jack . ) Set the rotary switch at desired DCA position. Open the circuit in which the current is to be meas ured, and connect test leads in series with the circuit .

Read current value on LCD display along with the polarity of red lead connection.

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AC VOLTAGE MEASUREME NT

Connect the red test lead to “V.Ω. mA” jack and the black test lead to the “COM” jac k. Set the rotary switch at desired ACV position. Connect test leads across the source or load being measured.

Read voltage value on the LCD display.

RESISTANCE MEASUREMENT

Connect the red test lead to the “V. Ω. mA” jack and black test lead to the “COM” jack. (The polarity of red lead is positive “+”.) Set the rotary switch at desired ”Ω” range position. Connect test leads across the resistor to be meas ured and read LCD display. If the resistance being measured is connected to a circuit, turn off power and discharge all capacitors

before applying test probes.

DIODE TEST

Connect the red test lead to the “V.Ω.m A” jack and the black test lead to the “COM” jac k (The polarity of red lead is positive “+”.). Set the rotary switch at “

” position. Connect the red test lead to the ano de of the diode to be tested and the black test lead t o the cathode of t he diode. The approx. forward voltage drop of the diode will be displayed. If the connection is reversed, only figure “1”

will be shown.

TRANSISTOR TEST

Set the rotary switch at “hFE” position. Determine whether the transistor under testing is NPN or PNP and locate the emitter, base and c ollector leads. Insert the leads into proper holes of the hFE socket on the front panel. Read the approximate hFE value at the test condition of

base current 10µA and Vce 3V.

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NOTE:

To avoid electrical shock, re m ove test leads from measurement circuits before testing a transistor.

AUDIBLE CONTINUITY TEST

Connect red test lead to “V.Ω.mA”, black test lead to “COM”. Set range switch to “

” position.

Connect test leads to two points of circuit to be tested. If

continuity exists, built-in buzzer will sound.

BATTERY & FUSE REPLACEMENT

If “

”appears on display, it indicates that the battery should be replaced. Fuse rarely needs replacement and usually blows as a result of operator’s error. To replace battery & fuse (200mA/250V) rem ove the 2 screws in the bottom of the case. Simply remove the old battery, and replace with a new one. Be careful to observe battery polarit y.

WARNING

Before attempting to open the case, a lways be sure that tes t leads have been disconnected fro m m eas urem e nt c irc uits. Close case and tighten screws completely before using the meter to avoid electrical s hoc k hazard.

ACCESSORIES

• Operator’s instruction manual

• Set of test leads

• 9 volt battery, NEDA 1604 6F22 006P type

• Holster

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