Major tech MT800 Bedienungsanleitung

INSTRUCTION MANUAL

ANALOGUE MULTIMETER

MT800

Contents Page no

1. Introduction...................................................................................4

2. Specifications.................................................................................4

3. Controls and Functions....................................................................4

4. Tips for using your Multimeter..........................................................5

5. Test Leads......................................................................................5

6. Battery Installation.........................................................................5

7. Operation......................................................................................5

8. DC/AC Voltage Measurements..........................................................6

9. DC Current Measurements...............................................................6

10. Resistance Measurements...............................................................6

11. Note for Testing Semiconductor Junctions..........................................6

12. Replacement of Fuse.......................................................................7

13. Tips for Best Handling......................................................................7

1. INTRODUCTION

The MT800 multimeter is designed to measure AC and DC voltage, DC

current, and resistance with accuracy and ease. It can also be used as a

battery tester for 1.5V and 9V batteries. The meter circuit incorporates a

fuse to protect the delicate meter and other internal parts in case of

inadvertent overload or improper function selection. The MT800 includes

well insulated test leads with plugs which ensures firm and safe

connections.

2. SPECIFICATIONS

DC Voltage (2000 ohms/v) 2.5V, 10V, 50V, 250V, 500V

AC Voltage (2000 ohms/v) 10V, 50V, 250V, 500V

DC Current 500uA, 10mA, 250mA

Resistance 2k ohms, 200k ohms (center scale 3.6)

Battery Test 1.5V, 9V

Accuracy ±5% of full scale value on DC ranges

±5% of full scale value on AC ranges

±5% of full scale-length on ohms

Sensitivity AC/DC voltage 2,000 ohms/volt

Battery 1x AA

Size 100 x 64 x 35mm

Weight 125g

Accessory Tip jack style leads (red/black)

RangeFunction

3. CONTROLS AND

FUNCTIONS

1 - OHMS scale

2 - ACV / DCV / DC mA scale

3 - AC 10V scale

4 - Battery test scale

5 - OHMS ADJUST

6 - 500 AC/DC 250mA MAX

(for red lead)

7 - Range switch

8 - Black test lead

WARNING: Use with extreme caution. Follow all safe guards suggested

in the manual in addition to normal safety precautions. Do not use this

meter if you are unfamiliar with electrical circuits and testing procedures.

4. TIPS FOR USING YOUR MULTIMETER

When using this tester, pay particular attention to polarities and check

positive and negative points. The red lead connects to positive points and

the black lead to negative. If you are checking unknown voltage and

currents, use highest range first then next lower range, and so on until

readings can be obtained. For most accurate readings, keep the meter lying

flat. Also, use a range setting that results in a reading in the upper third of

the meter scale. For exact readings, look at the scale from the point where

the pointer and its reflection on the mirror come together, otherwise a

reading error may result due to parallax.

5. TEST LEADS

Only use the same type of test leads that are supplied with this meter.

These test leads are rated for 1000V.

6. BATTERY INSTALLATION

A battery is required for resistance measurements. To install, use a phillips

screwdriver to remove the screw on the back cover. Pull apart the front and

back covers. Insert 1 AA battery (not supplied) in the battery compartment

observing correct polarity. Never leave a weak or dead battery in your unit.

Even leak-proof types may leak damaging chemicals. Remove the battery

when you don't intend to use your unit for more than a week.

To avoid electric shock, disconnect measuring terminals before installing

or removing battery. Open cover only when replacing battery, do not

touch any inside area other than the battery.

CAUTION: the MAX input limit for voltage and current measurements

between '+' and '－' is 500V AC, 500V DC and 250 mA DC.

7. OPERATION

8. DC/AC VOLTAGE MEASUREMENTS

1. Plug the test leads into the correct jacks (black into '-' and red into '+')

2. Set range switch to one of the DCV/ACV positions. If you are not

certain about the voltage level, start with 500V range.

3. Touch the test probe tips to the circuit under test, be sure to observe

correct polarity.

4. Read the voltage on the black DC/AC scales. For AC 10V, read the red

AC 10V scale.

WARNING: Use extreme care when making measurements for high

voltage. Do not touch terminals or probe ends.

9. DC CURRENT MEASUREMENTS

1. Plug the test leads into the correct jacks.

2. If you are not certain about the current level, start with 250mA range.

3. Open up the circuit in which you want to measure current and connect

the black lead to the negative side and the red lead to the positive side

of the circuit.

4. Apply power to the circuit under test and read the current on the black

DC scale.

WARNING: Do not apply voltage to measuring terminals while range

switch is in current position

10. RESISTANCE MEASUREMENTS

1. Plug the test leads into the '-' and '+' jacks.

2. Set range switch to the OHM position (Rx10 or Rx1k ohms) touch the

test probe tips together and adjust the OHMS ADJUST control to bring

the pointer to the '0' on the top (green) OHMS scale.

3. Now. touch the probe tips across the circuit or the part under test.

4. Read the resistance on the green OHMS scale.

NOTES: when you are unable to adjust the pointer to '0' on the OHMS

scale, the battery must be replaced.

WARNING: Do not apply voltage to measuring terminal while range

switch is in ohms position.

CAUTION: Always disconnect test leads before replacing battery.

11. NOTE FOR TESTING SEMI CONDUCTOR JUNCTIONS

When attempting to identify cathode and anode ends or the type of

transistor (PNP) or (NPN), the actual polarity of meter's voltage is opposite

of the lead colours. The red lead is the ‘-’ source and black lead is ‘+’.

WARNING: To avoid electric shock, disconnect measuring terminals

before removing fuse.

CAUTION: for continued protection against fire, replace only with 0.3A,

250V fuse.

12.REPLACEMENT OF FUSE

1. Use a phillips screwdriver to remove the screw on the back cabinet. Pull

apart the front and back cabinets.

2. Replace the fuse with a new fuse of the same type / rating (0.3A, 250V)

3. Do not touch any inside area other than the fuse.

13. TIPS FOR BEST HANDLING

1. Always observe correct polarity: red lead to positive and black lead to

negative terminal.

2. When checking unknown voltages, use the highest range first and

gradually decrease until readings are obtained.

3. For exact readings, look at the scale from the point where the pointer and

its reflection in the mirror come together, otherwise a reading error due

to parallax will result.

R1. 4.4K

R2. 15K

R3. 80K

R4. 400K

R5. 500K

R6. 1.14K

R7. 2 Ω

R8. 2Ω

R9. 46Ω

R11. 9Ω

R12. 3K

R13. 36Ω

D1,D3.

IN4148

D2. IN60P

DCV ACV BATT DCA

VR1 VR2 185uA

R12

D2D3

R13

R8 R7

R9 R10

R11

R1 R2 R3 R4 R5

BATT

25 10 50 250 500 X10 XIK 500 250 50 10 9 1.5 250m 10m 500μ

Ø Ø

F0.5A

www.major-tech.com www.majortech.com.au

[email protected] [email protected]

MAJOR TECH (PTY) LTD

South Africa Australia

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