Sealey Professional MM20 User manual

Function Red Lead Connection Input Limits
V
V~
A
A10A
hFE
ºC
2k
Ω
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.
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 ºCVΩmA 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 ºCVΩmA 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 ºCVΩmA 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 ºCVΩmA 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
3When using this multimeter, please observe all normal safety rules concerning:
Protection against the dangers of electrical 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 magnitude of the value 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 taking voltage measurements 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:
20 FUNCTION MULTIMETER
WITH THERMOCOUPLE
MODEL: MM20
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
MM20 - 1 - 221104
Layout:
1. LCD Display.
2. Rotary Switch.
3. Transistor Socket.
4. Input Sockets.
5. Hold Button.
ºCVΩmA
ºCVΩmA
ºCVΩmA
10ADC
N/A
ºCVΩmA
ºCVΩmA
ºCVΩmA
ºCVΩmA
600V dc
600V ac (sine)
200mA dc
10A dc
2kΩ
2MΩ
Measures:
 AC and DC Voltage
 DC Current
 Resistance
 Temperature
 Diode/Transistor
Verification Mode
1
2
3
4
5

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 3V.
3.7. CONTINUITY TEST
3.7.1. Connect the black lead to the COM input socket and the red lead to the ºCVΩmA 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 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 red lead of the K-type thermocouple plug into the ºCVΩmA input socket on the front panel and the black lead into the COM. Now 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 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.
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 but replacing the battery (9V PP3) instead of the fuse.
5.3. SPARE PARTS
MM20.01 TEST LEADS FOR MM20
MM20.02 FUSE (0.5A) FOR MM20
MM20.03 PROBE FOR MM20
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
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: MM20
89/336/EEC EMC Directive
73/23/EEC Low Voltage Directive
93/68/EEC CE Marking Directive
Signed by Mark Sweetman 22 November 2004
DC VOLTAGE
Range Accuracy Resolution
200mV ±0.5% of reading ±2 digits 0.1mV
2V ±0.5% of reading ±2 digits 1mV
20V ±0.5% of reading ±2 digits 10mV
200V ±0.5% of reading ±2 digits 0.1V
600V ±0.8% of reading ±2 digits1V
Input impedance: 10MΩfor all ranges.
AC VOLTAGE
Range Accuracy Resolution
200V ±1.2% of rdg ± 10 digits 100mV
600V ±1.2% of rdg ± 10 digits 1V
Overload protection: 600V dc or rms. ac for all
ranges.
Frequency range: 40Hz - 400Hz
Response: Average calibrated in rms sine wave.
RESISTANCE
Range Accuracy Resolution
200Ω±0.8% of reading ±3 digits 0.1Ω
2kΩ±0.8% of reading ±2 digit 1Ω
20kΩ±0.8% of reading ±2 digit 10Ω
200kΩ±0.8% of reading ±2 digit 100Ω
2MΩ±1.0% of reading ±2 digit 1kΩ
Maximum open circuit voltage: 3.2V
Overload protection: 250V dc or rms. as for all
ranges
DC CURRENT
Range Accuracy Resolution
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
10A ±2.0% of reading ±5 digits 10mA
Overload protection: F200mA/250V fuse
10A range unfused
Range Accuracy Resolution
4.1. Accuracy Calculation
Example: Test reading on 200Vdc range is 56.4V. Accuracy is ±0.5% of reading ±2 digit.
Reading ±2 digit = 56.4 ±2 on the last figure i.e. 56.2 to 56.6V.
±0.5% on this range gives 56.2 - 0.5% to 56.6 + 0.5% or 55.9 to 56.9V.Therefore the actual voltage lies between 55.9 and 56.9V.
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
± 10.0%
of rdg ± 2
digits
± 1.0% of
rdg ± 3
digits
± 2.0% of rdg
TEMPERATURE
TRANSISTOR hFE TEST (0-1000)
Range Test Range Test Current Test Voltage
NPN & PNP 0-1000 1b=10µA Vce=3V
01284 757500 [e-mail] www.sealey.co.uk
01284 703534 e-mail Web
MM20 - 1 - 221104