Sealey MM404 Instructions page 2

Digital clamp meter

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3.5.

Measuring Resistance

3.5.1.

Connect the black lead to the COM input socket and the red test lead to the the V/Ω input socket (the polarity of the red lead is ‘+’).

3.5.2.

Set the rotary switch to the required ‘Ω’ range and connect the test leads across the resistance under measurement.

3.5.3.

When checking in-circuit resistance, ensure that the circuit under test has all power removed and all capacitors have been fully discharged.

3.6.

Continuity Testing

3.6.1.

Connect the black lead to the COM input socket and the red lead to to the V/Ω input socket (the polarity of the red lead is ‘+’).

3.6.2.

If the circuit resistance under test is lower than 50Ω, the built-in buzzer will sound.

3.7.

Insulation Testing (with optional 500V insulation tester unit)

3.7.1. Set The rotary switch to the 2000MΩ external unit range. The display value will be unstable until a reading is taken, this is normal in

this range.

3.7.2. Insert the three tester unit jacks VΩ, COM and EXT into the MM404 input sockets VΩ, COM and EXT.

3.7.3. Set the insulation tester unit to the 2000MΩ position.

3.7.4. Connect the insulation tester unit’s L and E terminals to the installation under test. (The test installation’s power must be off).

p WARNING! Never perform insulation measurements on live circuits.

3.7.5. Set the insulation tester power switch to the on position.

3.7.6. Press the 500V push switch, the red led will light up. The clamp meter will display the insulation value.

3.7.7. If the reading is below 19MΩ, change the MM404 range to the 20MΩ external unit setting to improve the accuracy.

3.7.8. When not in use the tester unit must be switched off and all leads removed.

For more in depth instructions refer to the manual supplied with your MM404.261 Insulation Tester.

SPECIFICATION

AC CURRENT

Range

Accuracy

200A

±2% of reading +5 digits 100mA

1000A

±2% of reading +5 digits

for 800A and below

±3% of reading +5 digits above 800A

Overload protection: 1200A within 60 seconds

AC VOLTAGE

Range

Accuracy

750V

±1% of reading +4 digits

Input impedance: 9MΩ

Overload protection:750V AC/DC on all ranges

Insulation Test (with optional 500V test unit)

Range

Accuracy

20MΩ

±2% of reading +2 digits

200MΩ ±4% of reading +2 digits

for 500MΩ and below

±5% of reading +2 digits for greater than 500MΩ

MAINTENANCE

WARNING! Before attempting to open the case, ensure that test leads have been disconnected from measurement circuits to avoid

electric shock hazard.

5.1.

If the battery sign

cover retaining screw and slide off the back cover. Replace the battery. (9V PP3)

5.2.

SPARE PARTS

DECLARATION OF CONFORMITY

Declaration of Conformity We, the sole UK importer, declare that the product listed below is in conformity with the following standards and directives.

DIGITAL MULTIMETER

Model: MM.404

73/23/EEC Low Voltage Directive

93/68/EEC CE Marking Directive

89/336/EEC EMC Directive

NOTE: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.

IMPORTANT: No liability is accepted for incorrect use of this equipment.

WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.

INFORMATION: For a copy of our latest catalogue and promotions call us on 01284 757525 and leave your full name and address, including postcode.

Resolution

RESISTANCE.

Resolution

Range

10KΩ

200Ω

1MΩ

20KΩ

Overload Protection. 500VDC/rms AC on all ranges.