Sealey MM20.V2 User manual

Heavy duty general purpose multimeter with clear and easy to read LCD display. Features data hold function,
temperature probe and diode test facility. Housed in rugged rubber boot with integral stand. Supplied with full set
of leads and probes.
 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 0°C to 40°C.
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 VΩmAºChFE 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 VΩmAºChFE 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 VΩmAºChFE input 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 When checking in-circuit resistance, ensure that the circuit under test has all power removed and all capacitors have been fully discharged.
3.3.4 When measuring resistance over 1MΩ, the meter may take a few seconds to get a stable reading. This is normal for high resistance measurements.
3.5 DIODE TESTING
3.5.1 Connect the black lead to the COM input socket and the red lead to to the VΩmAºChFE input 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.
1.1 PERSONAL PRECAUTIONS
When using this multimeter, please observe all normal safety rules concerning:
Protection against the dangers of electrical current.
Protection of the meter against misuse.
Full 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.
 DO NOT use leads if damaged or if the wire is bared in any way.
1.2 GENERAL SAFETY INSTRUCTIONS
Familiarise yourself with the application and limitations of the multimeter as well as the potential hazards. IF IN ANY DOUBT CONSULT A QUALIFIED
ELECTRICIAN.
When the meter is connected to a circuit, do not touch unused meter terminals.
When the magnitude of the value to be measured is unknown beforehand, set the range selector to the highest value.
Before rotating the range selector to change functions, disconnect test leads from the circuit under test.
WARNING! Never perform resistance measurements on live circuits.
Always be careful when working with voltages above 60Vdc or 30Vac rms. Keep your fingers behind the probe barriers while measuring.
Before attempting to insert transistors for testing, ensure that test leads have been disconnected.
Components should not be connected to the transistor socket, capacitor socket or temperature socket when taking voltage measurements with the test leads.
 When not in use, store the multimeter carefully in a safe, dry, childproof location. Storage temperature range -10°C to 50°C.
INSTRUCTIONS FOR:
7 FUNCTION MULTIMETER
WITH THERMOCOUPLE
MODEL No: MM20.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
Layout:
1. LCD Display
2. Rotary Switch
3. VΩmAºChFE Socket
4. COM Socket
5. 10A Socket
6. Hold Button
7. External Transistor
Test Plug
Measures:
• AC and DC Voltage
• DC Current
• Resistance
• Temperature
• Diode/Transistor
Verification Mode
1
2
3
7
6
5
4
MM20.V2 Issue No: 2 - 02/07/10
Function Red Lead Connection Input Limits
V VΩmAºChFE 600Vdc
V~ VΩmAºChFE 600Vac (sine)
A VΩmAºChFE 200mA dc
A 10A 10A 10A dc
hFE VΩmAºChFE
°C VΩmAºChFE
VΩmAºChFE
2k VΩmAºChFE 2kΩ
ΩVΩmAºChFE 2MΩ

AC VOLTAGE
Range Accuracy Resolution
200V ±1.2% of rdg ± 10 digits 100mV
600V ±1.2% of rdg ± 10 digits 1V
Overload protection: 600Vdc or 600Vac for all ranges.
Frequency range: 40Hz - 450Hz
Response: Average calibrated in rms sine wave.
TEMPERATURE
Range Accuracy Resolution
0°C to 40°C 1-50°C to 400°C 2400°C to 1000°C 2
-50°C
to
1000°C
± 5.0% of rdg
± 2°C
± 0.75% of rdg
± 3°C
± 1.5% of rdg
± 15°C
1°C
1. Built in temperature sensor within multimeter.
2. Temperature readings with thermocouple.
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 external transistor testing socket. Connect the black lead to the COM connector and the red lead to the VΩmAºChFE input socket.
3.6.3 The meter will show the approximate hFE value at test conditions of base current 10µA and Vce 2.8V.
3.7 CONTINUITY TEST
3.7.1 Connect the black lead to the COM input socket and the red lead to the VΩmAºChFE input 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
100Ω) the built-in buzzer will sound.
3.8 MEASURING TEMPERATURE
3.8.1 Set the rotary switch to the °C position and the LCD display will show the ambient temperature.
3.8.2 Insert the red lead of the K-type thermocouple plug into the VΩmAºChFE input socket on the front panel and the black lead into the COM. Now touch the
object to be measured with the thermocouple probe.
 WARNING! To avoid electric shock, ensure that the thermocouple has been removed before changing to another function measurement.
5. MAINTENANCE
4. SPECIFICATION
 WARNING! Before attempting to open the case, ensure that test leads have
been disconnected from measurement circuits to avoid electric shock hazard.
5.1 To change a fuse. The fuses are located on the back of the circuit board. To
gain access to the fuse, remove the protective rubber boot and the two screws
from the rear of the meter. Lift off the rear cover, replace the fuse and
re-assemble in reverse order.
 WARNING! ALWAYS replace a fuse with one of the correct rating.
Fuse 1: 500mA/250V
Fuse 2: 10A/250V
5.2 If the battery sign appears on the LCD display, it indicates that the battery
should be replaced. Repeat the steps detailed in section 5.1 to remove the rear
cover, replace the battery (9V PP3) and re-assemble in reverse order.
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.
4.1 Accuracy Calculation
Example: Test reading on 200Vdc range is 56.4V. Accuracy is ±0.8% of reading ±2 digit.
Reading ±2 digit = 56.4 ±2 on the last figure i.e. 56.2 to 56.6V.
±0.8% on this range gives 56.2 - 0.8% to 56.6 + 0.8% or 55.7 to 57.1V. Therefore the actual voltage lies between 55.7 and 57.1V.
Note: Accuracy is specified for a period of one year after calibration and at 18°C to 28°C with a relative humidity of 80%.
MM20.V2 Issue No: 2 - 02/07/10
01284 757500
[e-mail]
www.sealey.co.uk
01284 703534
Sole U.K. Distributor
Sealey Group
Bury St. Edmunds
Suffolk.
Web
TRANSISTOR hFE TEST (External transistor test plug)
Range Test Range Test Current Test Voltage
NPN & PNP 0-1000 1b=10µA Vce=2.8V
DC VOLTAGE
Range Accuracy Resolution
200mV ±0.5% of reading ±2 digits 0.1mV
2V ±0.8% of reading ±2 digits 1mV
20V ±0.8% of reading ±2 digits 10mV
200V ±0.8% of reading ±2 digits 0.1V
600V ±1.0% of reading ±2 digits 1V
Input impedance: 10MΩfor all ranges.
DC CURRENT
Range Accuracy Resolution
2mA ±1.0% of reading ±2 digits 1µA
20mA ±1.0% of reading ±2 digits 10µA
200mA ±1.2% of reading ±2 digits 0.1mA
10A ±2.0% of reading ±2 digits 10mA
Overload protection: Fuse 1: 500mA/250V
Overload protection: Fuse 2: 10A/250V
RESISTANCE
Range Accuracy Resolution
200Ω±0.8% of reading ±2 digits 0.1Ω
2kΩ±0.8% of reading ±2 digits 1Ω
20kΩ±0.8% of reading ±2 digits 10Ω
200kΩ±0.8% of reading ±2 digits 100Ω
2MΩ±1.0% of reading ±2 digits 1kΩ
Maximum open circuit voltage: 2.5V
Overload protection: 220Vdc or rms for a maximum
of 15 seconds for all ranges.
Environmental Protection.
Recycle unwanted materials instead of disposing of them as
waste. All tools, accessories and packaging should be sorted,
taken to a recycle centre and disposed of in a manner which is
compatible with the environment.
When the product is no longer required, it must be disposed of in an
environmentally protective way.
Battery Removal
See Section 5.2.1.
Remove and dispose of according to local authority guidelines.2.