Sealey MM302.V2 User manual

200mV
V & V~
Hz
Ω
mA & mA~
10A & 10A~
Function Red Lead Connection Input Limits
Professional tradesmans multimeter with 25mm LCD display. Durable case with protective boot, probe storage and
integral two-position stand. Features heavy-duty circuitry with auto over-range display, auto zero, auto power-off, audible
continuity warning and polarity protection on all necessary ranges. Supplied with probe test leads and temperature probe.
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.
Remember to turn on multimeter before use and to turn it off when measurement is completed.
NOTE: WHEN THE FIGURE 1 IS DISPLAYED, IT INDICATES AN OVER-RANGE SITUATION AND A HIGHER RANGE NEEDS TO BE SELECTED.
3.1. MEASURING VOLTAGE
3.1.1. Connect the black test lead to the COM input socket and the red test lead to the V/Ω input socket.
3.1.2. Set the rotary switch to the required V  (dc) or V ~  (ac) range and connect test leads across the source or load under measurement. The polarity
of the red test lead connection will be indicated when measuring dc voltages.
3.2. MEASURING CURRENT
3.2.1. Connect the black test lead to the COM input socket and the red test lead to the mA input socket for measuring a maximum of 200mA. For a maximum
of 10A connect the red lead to the 10A socket.
3.2.2. Set the rotary switch to the required A  (dc) or A ~ (ac) range and connect test leads in series with the load under measurement. The polarity of the
red lead connection will be indicated when measuring dc.
3.3. MEASURING RESISTANCE
3.3.1. 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 +).
3.3.2. Set the rotary switch to the required Ωrange and connect the test leads across the resistance under measurement.
3.3.3. If the resistance being measured exceeds the maximum value of the range selected or the input is not connected, an over-range indication 1 will be displayed.
3.3.4. When checking in-circuit resistance, ensure that the circuit under test has all power removed and all capacitors have been fully discharged.
3.3.5. When measuring resistance over 1MΩ, the meter may take a few seconds to get a stable reading. This is normal for high resistance measurements.
3.3.6. In the 200MΩrange the display reading is approx. 1.0 when the test leads are shorted. This figure must be subtracted from measured results. For example,
when measuring a 100MΩ resistance the display reading would be 101.0 and the corrected result would be 101.0 - 1.0 = 100MΩ.
3.4. MEASURING CAPACITANCE
3.4.1. Set the rotary switch to the required F range.
3.4.2. Before inserting capacitor into the capacitor socket, ensure that the capacitor has been fully discharged.
1.1. PERSONAL PRECAUTIONS
3When using this multimeter, please observe all normal safety rules concerning:
Protection against the dangers of electronic 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 beforehand, 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.
3Before attempting to insert transistors for testing, ensure that test leads have been disconnected.
3Components should not be connected to the transistor socket, capacitor socket or temperature socket when making voltage measurement with the test leads.
3When not in use, store the multimeter carefully in a safe, dry, childproof location. Storage temperature range -10OC to 50OC.
INSTRUCTIONS FOR:
10 FUNCTION MULTIMETER
MODEL: MM302.V2
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
MM302.V2 - 1 - 210904
Layout:
1. Power Switch.
2. LCD Display.
3. Transistor Socket.
4. Rotary Switch.
5. Temperature Socket.
6. Input Sockets.
7. Capacitor Socket.
V Ω Hz
V Ω Hz
VΩ Hz
V Ω Hz
V Ω Hz
mA
A
250v dc or rms ac
1000v dc 700v ac (sine)
250V dc or rms ac
250V dc or rms ac
250V dc or rms ac
200mA dc or rms ac
10A dc or rms ac continuous
20A for 15 seconds max
Measures:
 AC and DC Voltage
 AC and DC Current
 Resistance
 Capacitance
 Temperature
 Diode Test
 Audible Continuity
 Transistor Test

3.5. DIODE TESTING
3.5.1. 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 +).
3.5.2. Set the rotary switch to the   position and connect the red lead to the anode and the black lead to the cathode of the diode under test. The meter
will show the approximate forward voltage of the diode. If the leads are reverse connected, only 1 is displayed.
3.6. TRANSISTOR TESTING
3.6.1. Set the rotary switch to the hFE position.
3.6.2. Determine whether the transistor to be tested in NPN or PNP type and locate the Emitter, Base and Collector leads. Insert leads of the transistor into
the correct holes in the transistor testing socket.
3.6.3. The meter will show the approximate hFE value at test conditions of base current 10µA and Vce 3.2V.
3.7. CONTINUITY TEST
3.7.1. Connect the black lead to the COM input socket and the red lead to the V/Ωinput socket (the polarity of the red lead is +).
3.7.2. Set the rotary switch to the   position and connect the test leads across the two points of the circuit under test. If continuity exists (i.e. resistance less
than 50Ω) the built-in buzzer will sound.
3.8. MEASURING TEMPERATURE
3.8.1. Set the rotary switch to the OC position and the LCD display will show the ambient temperature.
3.8.2. Insert the K type thermocouple plug into the temperature socket on the front panel and touch the object to be measured with the thermocouple probe.
p WARNING! To avoid electric shock, ensure that the thermocouple has been removed before changing to another function measurement.
5. MAINTENANCE
4. SPECIFICATION
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. For continued protection against fire, replace fuse only with another of the same rating (F200mA/250V Quick Acting). Fuse is located under the circuit board. To
gain access to the fuse remove the three screws from the rear of the meter, lift of the rear cover and gently lift the circuit board from the front cover, replace the fuse
and re-asemble in reverse order..
5.2. If the battery sign   appears on the LCD display, it indicates that the battery should be replaced. Remove the meter from the outer
protective casing. Remove the rear cover retaining screws and lift off the back cover. Replace the battery. (9V PP3)
5.3. SPARE PARTS
MM19/F - Fuse, 200mA MM30/L - Set of Leads
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
MM302.V2 - 1 - 210904
01284 757500 01284 703534 E-mail: [e-mail]
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.
Sole UK Distributor,
Sealey Group,
Bury St. Edmunds, Suffolk.
Declaration of Conformity We, the sole UK importer, declare that the product listed below is in conformity with the following standards and directives.
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.
DIGITAL MULTIMETER
Model: MM.302.V2
89/336/EEC EMC Directive
Signed by Mark Sweetman 1st September 2004
DC VOLTAGE
Range Accuracy Resolution
200mV ±0.5% of reading ±1 digit 0.1mV
2V ±0.5% of reading ±1 digit 1mV
20V ±0.5% of reading ±1 digit 10mV
200V ±0.5% of reading ±1 digit 0.1V
1000V ±0.8% of reading ±2 digits 1V
Input impedance: 10MΩfor all ranges.
AC VOLTAGE
Range Accuracy Resolution
200mV ±1.2% of reading ±3 digits 0.1mV
2V ±0.8% of reading ±3 digits 1mV
20V ±0.8% of reading ±3 digits 10mV
200V ±0.8% of reading ±3 digits 0.1V
700V ±1.2% of reading ±3 digits 1V
Input impedance: 10MΩfor all ranges.
Frequency range: 40 - 400Hz
Response: Average, calibrated in rms of sine wave.
RESISTANCE
Range Accuracy Resolution
200Ω±0.8% of reading ±3 digits 0.1Ω
2kΩ±0.8% of reading ±1 digit 1Ω
20kΩ±0.8% of reading ±1 digit 10Ω
200kΩ±0.8% of reading ±1 digit 100Ω
2MΩ±0.8% of reading ±1 digit 1kΩ
20MΩ±1.0% of reading ±2 digits 10kΩ
200MΩ ±5.0% of (rdg - 10) ±10 digits 100kΩ
On 200 MΩrange,if short input the display will
read 1MΩ, this should be subtracted from the
measurement results. DC CURRENT
Range Accuracy Resolution
20µA ±0.8% of reading ±1 digit 0.01µA
200µA ±0.8% of reading ±1 digit 0.1µA
2mA ±1.5% of reading ±1 digit 1µA
20mA ±2.0% of reading ±5 digits 10µA
200mA ±1.5% of reading ±1 digits 0.1mA
2A ±2.0% of reading ±3 digits1mA
10A ±2.0% of reading ±5 digits 10mA
Overload protection: 0.2A/250V fuse.
10A range unfused.
AC CURRENT
Range Accuracy Resolution
200µA ±0.8% of reading ±3 digits 0.1µA
2mA ±1.0% of reading ±3 digits 1µA
20mA ±1.0% of reading ±3 digits 10µA
200mA ±1.8% of reading ±3 digits 0.1mA
2A ±2.0% of reading ±5 digits 1mA
10A ±3.0% of reading ±7 digits 10mA
Frequency Range: 40Hz to 400Hz.
Response: Average calibrated in rms sine wave.
CAPACITANCE
Range Accuracy Resolution
2nF ±4.0% of reading ± 3 digits 1pF
20nF ±4.0% of reading ± 3 digits 10pF
200nF ±4.0% of reading ± 3 digits 0.1nF
2µF ±4.0% of reading ± 3 digits1nF
20µF ±4.0% of reading ± 3 digits 10nF
Range Accuracy Resolution
4.1. Accuracy Calculation
Example: Test reading on 200Vdc range is 56.4V. Accuracy is ±0.5% of reading ±1 digit.
Reading ±1 digit = 56.4 ±1on the last figure i.e. 56.3 to 56.5V.
±0.5% on this range gives 56.3 - 0.5% to 56.5 + 0.5% or 56.0 to 56.8V. Therefore the actual voltage lies between 56.0 and 56.8V.
Note: Accuracy is specified for a period of one year after calibration and at 18OC to 28OC with a relative humidity of 80%.
-20° to 0°C 0° to 400°C 400°C to 1000°C
1°C
-20°C
to
1000°C
± 5.0% of
rdg ± 4
digits
± 1.0% of
rdg ± 3
digits
± 2.0% of rdg
TEMPERATURE