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3.5.
DIODE TESTING
3.5.1.
Connect the black lead to the ‘COM’ input socket and the red lead to to the V/W input socket (the polarity of the red lead is ‘+’).
3.5.2.
Set the rotary switch to the ‘
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 2.8V.
3.7.
CONTINUITY TEST
3.7.1.
Connect the black lead to the ‘COM’ input socket and the red lead to the V/W input socket (the polarity of the red lead is ‘+’).
3.7.2.
Set the rotary switch to the ‘
than 50W) the built-in buzzer will sound.
3.8.
MEASURING TEMPERATURE
3.8.1.
Set the rotary switch to the ‘
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.
F
WARNING! To avoid electric shock, ensure that the thermocouple has been removed before changing to another function measurement.
4.
SPECIFICATION
4.1.
DC VOLTAGE
Range
Accuracy
200mV
±0.5% of reading ±1 digit
2V
±0.5% of reading ±1 digit
20V
±0.5% of reading ±1 digit
200V
±0.5% of reading ±1 digit
1000V
±0.8% of reading ±2 digits
Input impedance:
10MW for all ranges.
Overload protection: 250Vrms for 200mV range.
1000Vdc or 1000Vac peak
for all other ranges.
4.2.
AC VOLTAGE
Range
Accuracy
200mV
±1.2% of reading ±3 digits
2V
±0.8% of reading ±3 digits
20V
±0.8% of reading ±3 digits
200V
±0.8% of reading ±3 digits
700V
±1.2% of reading ±3 digits
Input impedance:
10MW for all ranges.
Frequency range:
40 - 400Hz
Indication:
Average (rms of sine wave).
Overload protection: 250Vrms for 200mV range.
750Vrms or 1000V peak for
all other ranges.
4.8.
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 18
5.
MAINTENANCE
F
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 behind battery cover (see 5.2.).
5.2.
If the battery sign ‘
protective casing. Remove the battery cover retaining screw (behind base of meter stand) and slide off the battery cover. Replace the battery with
one of the same type and size (9V PP3).
5.3.
SPARE PARTS
TA97/TP - Temperature Probe
6.
DECLARATION OF CONFORMITY
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: MM402
89/336/EEC EMC Directive
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.
‘ position and connect the red lead to the anode and the black lead to the cathode of the diode under test. The meter
‘ position and connect the test leads across the two points of the circuit under test. If continuity exists (i.e. resistance less
C’ position and the LCD display will show the ambient temperature.
O
4.3.
DC CURRENT
Resolution
Range
100µV
2mA
1mV
20mA
10mV
200mA
100mV
10A
1V
Overload protection: 0.2A/250V fuse. 10A range
Max. input:
4.4.
AC CURRENT
Resolution
Range
100µV
2mA
1mV
20mA
10mV
200mA
100mV
10A
1V
Frequency range:
Indication:
Overload protection: 0.2A/250V fuse. 10A range
Max. input:
‘ appears on the LCD display, it indicates that the battery should be replaced. Remove the meter from the outer
MM19/F - Fuse, 200mA
Sole UK Distributor,
Sealey Group,
Bury St. Edmunds, Suffolk.
Accuracy
Resolution
±0.8% of reading ±1 digit
±0.8% of reading ±1 digit
±1.5% of reading ±1 digit
100µA
±2.0% of reading ±5 digits
unfused.
mA ranges - 200mA
10A range - 10A continuous,
20A for 15 seconds max.
Accuracy
Resolution
±1.2% of reading ±3 digits
±1.2% of reading ±3 digits
±2.0% of reading ±3 digits
100µA
±3.0% of reading ±7 digits
40 - 400Hz
Average (rms of sine wave).
unfused.
mA ranges - 200mA
10A range - 10A continuous,
20A for 15 seconds max.
C to 28
C with a relative humidity of 80%.
O
O
MM30/L - Set of Leads
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.
Signed by Mark Sweetman
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
01284 757500
4.5.
RESISTANCE
Range
1µA
200W
±0.8% of reading ±3 digits
10µA
2kW
±0.8% of reading ±1 digit
20kW
±0.8% of reading ±1 digit
10mA
200kW
±0.8% of reading ±1 digit
2MW
±0.8% of reading ±1 digit
20MW
±1.0% of reading ±2 digits
200MW
±5.0% of (rdg - 1.0) ±10 digits
Max. open circuit voltage:
Overload protection:
4.6.
CAPACITANCE
Range
1µA
2000pF
10µA
20nF
200nF
±2.5% of reading ±5 digits
10mA
2µF
20µF
4.7.
TEMPERATURE
Range
-50 to +400
C*
±0.75% of reading ±3
O
400 to 1000
C* ±1.5% of reading ±15
O
0 to 40
C**
O
*Using thermocouple probe
**Using built-in temperature sensor.
7th December 2001
01284 703534 E-mail: sales@sealey.co.uk
Accuracy
Resolution
0.1W
1W
10W
100W
1kW
10kW
100kW
2.8V
250Vrms ac.
Accuracy
Resolution
1pF
10pF
100pF
1nF
10nF
Accuracy
Resolution
C
1
C
O
O
C
1
C
O
O
±2
C
1
C
O
O
MM402 - 1 - 061201
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