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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.
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. KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
Refer to
Electrical shock
instructions
hazard
1. SAFETY
1.1.
PERSONAL PRECAUTIONS
When using this multimeter, please observe all normal safety rules concerning:
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Protection against the dangers of electrical current.
Protection of the meter against misuse.
Familiarise yourself with the application and limitations of the multimeter as well as the potential hazards. IF IN ANY DOUBT CONSULT
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A QUALIFIED ELECTRICIAN.
1.2.
GENERAL SAFETY INSTRUCTIONS
Full compliance with safety standards can only be guaranteed if used with the test leads supplied. If necessary, they must be replaced
9
with genuine Sealey leads with the same electronic ratings. Failure to do so will invalidate the warranty.
WARNING! Inspect test leads and probes for cracks, breaks or crazes in the insulation before using the meter.
‰
DO NOT use leads if damaged or if the wire is bared in any way.
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DO NOT use the meter if it has been damaged.
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Measurement category III is for the measurements performed on circuits directly connected to the low voltage installation. This meter
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has been designed according to IEC-61010-1 concerning electronic measuring instruments with an overvoltage category (CAT III
600V) and pollution degree 2.
WARNING! Use extreme caution when working with high voltages.
‰
Perform a risk assessment of tasks to be carried out before using the meter.
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Before commencing testing, follow instructions below and select the correct input sockets, function and range on the multimeter.
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When the meter is connected to a circuit, DO NOT touch any unused meter terminals.
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When the magnitude of the value to be measured is unknown beforehand, set the range selector to the highest value available.
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Before rotating the range selector to change functions, disconnect test probes from the circuit under test.
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WARNING! Never perform resistance, transistor, diode or continuity measurements on live circuits.
‰
Always take care when working with voltages above 60V DC or 30V AC rms. These voltages are considered a shock hazard.
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Always keep fingers behind the probe barriers whilst measuring and DO NOT use when hands are wet.
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DO NOT touch the test leads, tips or the circuit being tested.
8
Choose the proper range and function for the required measurement. DO NOT try voltage or current measurements that may exceed
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the ratings marked on the Function/Range switch.
When testing for the presence of a voltage or current, make sure the meter is functioning correctly. Take a reading of a known voltage or
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current before accepting a zero reading.
DO NOT test voltages above 600V AC or DC - the circuitry of the multimeter will be destroyed.
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WARNING! NEVER connect the multimeter to a voltage source / live circuit when the rotary switch is set to any other function apart
‰
from Voltage testing.
WARNING! Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed
‰
electrical contacts. Other means should be used to ensure that the terminals are not "live".
Avoid damaging the meter when testing voltage. Disconnect the test leads from the test points before changing functions.
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DO NOT attempt a voltage measurement with the test leads in the mA/A terminal.
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DO NOT perform resistance measurements on live circuits.
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ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.
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DO NOT use the multimeter in a potentially explosive atmosphere or where flammable material is present.
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ONLY operate the multimeter when the back cover is in place and fastened securely.
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If any abnormal readings are observed, the multimeter must be checked out by an authorised technician.
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ALWAYS turn off the multimeter and disconnect the test leads, before opening the back cover to replace the fuse or battery.
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When not in use, store the multimeter carefully in a safe, dry, childproof location out of direct sunlight. If storing for a long period of time,
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remove the battery. Storage temperature range: -10°C to 60°C.
NOTE: The warnings, cautions and instructions referred to in this manual cannot cover all possible conditions and situations that may
occur. It must be understood that common sense and caution are factors which cannot be built into this product, but must be applied
by the operator.
WARNING! Engines produce carbon monoxide which is odourless and causes slower reaction time which could lead to serious injury.
‰
An engine in operation should be in a well ventilated area, or the vehicle's exhaust connected to an adequate fume removal system.
© Jack Sealey Limited
10-FUNCTION PROFESSIONAL AUTO-
RANGING DIGITAL MULTIMETER
MM21
MODEL NO:
Warning
Keep in dry area
protect from rain
Original Language Version
MM21
Issue 2
17/06/24
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Summary of Contents for Sealey MM21
- Page 1 MM21 MODEL NO: 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. 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.
- Page 2 Frequency (Accuracy): Duty Cycle: Continuity Audible: Diode Test: Probe Specification Voltage 600V Measurement Category Category III Probe Symbols Hazardous voltage Caution - Read Instructions Conforms to Double Insulated standard MM21 Issue 2 17/06/24 Original Language Version © Jack Sealey Limited...
- Page 3 RESOLUTION ACCURACY Diode Test 1.000 V 0.001V 1.0% uncertainty Overload protection: 600V DC or 600V AC rms. Test Condition: Forward DC current approximately 1mA. Reversed DC voltage approximately 1.5V MM21 Issue 2 17/06/24 Original Language Version © Jack Sealey Limited...
- Page 4 Connect the test leads to the circuit or resistor being measured and read the displayed value. 4.4.4. DO NOT input a Voltage source at this mode. 4.5. TEMPERATURE MEASUREMENT 4.5.1. Set the rotary switch to Temperature range. MM21 Issue 2 17/06/24 Original Language Version © Jack Sealey Limited...
- Page 5 Turn the multimeter off when not in use and remove the batteries if stored for a long period of time. DO NOT store the multimeter in a place of high humidity or high temperature. MM21 Issue 2 17/06/24 Original Language Version © Jack Sealey Limited...
- Page 6 BATTERY REMOVAL Under the Waste Batteries and Accumulators Regulations 2009, Jack Sealey Ltd are required to inform potential purchasers of products containing batteries (as defined within these regulations), that they are registered with Valpak’s registered compliance scheme. Jack Sealey Ltd Batteries Producer Registration Number (BPRN) is BPRN00705.