Sealey MM404 User manual

p WARNING! Ensure that you read, understand and apply the safety and operational instructions before connecting the multimeter. Only
when you are sure that you understand the procedures is it safe to proceed with testing.
Operating temperature range 0OC to 40OC.
Relative humidity: Maximum 80%.
3.1. Rotary Function Switch.
3.1.1. Rotate this switch to select the desired function ranges for AC/DC voltage, AC current
, resistance, audible continuity and insulation tester.
3.2. Data-hold Button.
3.2.1. Press this button to hold the last reading in the display. The display will remain held until you either press the data-hold button again or
switch the meter off.
3.3. Measuring AC Current.
3.3.1. Set the rotary function switch to the 1000A position.
3.3.2. Press the trigger to open the transformer jaws and clamp over one conductor only.
Note: It is not possible to take a reading from more than one conductor at a time.
3.3.3. Keep the conductor as close to the centre of the jaws as possible to improve the accuracy.
3.3.4. If the reading is less than 200A turn the rotary switch to the 200ACA position to improve the accuracy.
3.4. Measuring Voltage
3.4.1. Connect the black test lead to the COM input socket and the red test lead to the V/Ωinput socket.
3.4.2. Set the rotary switch to the required V (dc) or V ~ (ac) range and connect test leads across the source or load under measurement.
Layout: (Fig.1.)
1. Jaws 4. Rotary Function Switch 7. COM input
2. Trigger 5. Display 8. VΩ Input
3. Data Hold 6. EXT Input 9. Wrist Strap
Durable composite case with integral AC current test clamp, suitable for the toughest
workshop conditions. Four digit, large and clear, 12mm LCD display. Features
push-button data hold and five function, eight range, rotary selection switch.
Supplied with probe test leads, wrist strap and carry case.
1.1. PERSONAL PRECAUTIONS
3When using this meter, please observe all normal safety rules concerning:
Protection against the dangers of electric current.
Protection of the meter against misuse.
3Full compliance with safety standards can only be guaranteed if used with the test leads supplied. If necessary, they must be replaced
with genuine Sealey leads with the same electronic ratings. Failure to do so will invalidate the warranty.
7DO NOT use leads if damaged or if the wire is bared in any way.
1.2. GENERAL SAFETY INSTRUCTIONS
3Familiarise yourself with the application and limitations of the multimeter as well as the potential hazards.
IF IN ANY DOUBT CONSULT A QUALIFIED ELECTRICIAN.
3When the meter is connected to a circuit, do not touch unused meter terminals.
3When the value scale to be measured is unknown, set the range selector to the highest value.
3Before rotating the range selector to change functions, disconnect test leads from the circuit under test.
pWARNING! Never perform resistance measurements on live circuits.
3Always be careful when working with voltages above 60Vdc or 30Vac rms. Keep your fingers behind the probe barriers while measuring.
3When not in use, store the multimeter carefully in a safe, dry, childproof location.
Storage temperature range - 10OC to 50OC.
INSTRUCTIONS FOR:
DIGITAL CLAMP METER
MODEL: MM404.
Thank you for purchasing a Sealey product. Manufactured to a high standard this product will, if used according to these instructions and properly maintained,
give you years of trouble free performance.
1. SAFETY INSTRUCTIONS
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE THE PRODUCT
CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR PERSONAL INJURY AND WILL
INVALIDATE THE WARRANTY. PLEASE KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
2. FEATURES
3. OPERATION
MM404 - 1 - 070105
AC Voltage 1 - 750V
DC Voltage 1 - 1000V
AC Current 0.1A - 1000A
Resistance 100mΩ- 20KΩ
Audible Continuity 50 ± 25Ω with audible tone
Insulation Test 100KΩ - 2000MΩ (with optional insulation test unit)
Fig.1

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/Ωinput 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/Ωinput 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 2000MΩexternal 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 2000MΩposition.
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).
pWARNING! 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.
4. SPECIFICATION
DC VOLTAGE (auto ranging)
Range Accuracy Resolution
1000V ±0.5% of reading ±1 digit 1V
Input impedance: 9MΩ
Overload Protection: 1000V DC/peak AC on all
ranges
AC VOLTAGE
Range Accuracy Resolution
750V ±1% of reading +4 digits 1V
Input impedance: 9MΩ
Overload protection:750V AC/DC on all ranges
AC CURRENT
Range Accuracy Resolution
200A ±2% of reading +5 digits 100mA
1000A ±2% of reading +5 digits 1A
for 800A and below
±3% of reading +5 digits above 800A
Overload protection: 1200A within 60 seconds
Insulation Test (with optional 500V test unit)
Range Accuracy Resolution
20MΩ±2% of reading +2 digits 10KΩ
200MΩ±4% of reading +2 digits 1MΩ
for 500MΩ and below
±5% of reading +2 digits for greater than 500MΩ
RESISTANCE.
Range Accuracy Resolution
200Ω± 1% of reading ±3 digits 0.1Ω
20KΩ± 1% of reading ±1 digits 10Ω
Overload Protection. 500VDC/rms AC on all ranges.
CONTINUITY TEST
Range 200Ω
Buzzer Sound 50 ± 25Ω
Overload Protection 500VDC /rms AC
5. MAINTENANCE
6. DECLARATION OF CONFORMITY
p 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 appears on the LCD display, it indicates that the battery should be replaced. Remove the rear
cover retaining screw and slide off the back cover. Replace the battery. (9V PP3)
5.2. SPARE PARTS MM404.01 TEST LEADS
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
MM404 - 1 - 070105
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.
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
Signed by Mark Sweetman 1st September 2004
01284 757500
01284 703534 [e-mail]
Sole UK Distributor
Sealey Group,
Bury St. Edmunds, Suffolk.
www.sealey.co.uk
Web
email
The construction file for this product is held by the Manufacturer and may be inspected,
by a national authority, upon request to Jack Sealey Ltd.