3.5. TRANSISTOR
TESTING
3.5.1.
Set the rotary switch to the hFE position.
3.5.2.
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.
3.5.3.
The meter will show the approximate hFE value at test conditions of base current 10µA and Vce 2.8V.
4. SPECIFICATION
DC VOLTAGE
Range
Accuracy Resolution
200mV
±0.25% 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
1000V
±0.5% of reading ±2 digits
1V
Overload protection: 220Vrms AC for 200mV range
and 1000V DC or 750V rms AC for other ranges.
AC VOLTAGE
Range
Accuracy Resolution
200V
±1.2% of rdg ± 10 digits
100mV
750V
±1.2% of rdg ± 10 digits
1V
Overload protection: 1000V DC or 750V rms. as
for all ranges.
Frequency range: 45Hz - 450Hz
Response: Average calibrated in rms sine wave.
RESISTANCE
Range
Accuracy Resolution
200
Ω
±0.8% of reading ±2 digits
0.1
Ω
2k
Ω
±0.8% of reading ±2 digits
1
Ω
20k
Ω
±0.8% of reading ±2 digits
10
Ω
200k
Ω
±0.8% of reading ±2 digits
100
Ω
2M
Ω
±1.0% of reading ±2 digits
1k
Ω
Maximum open circuit voltage: 2.8V
Overload protection: 15 seconds at 220V DC or rms.
as for all ranges.
DC CURRENT
Range
Accuracy
Resolution
200µA
±1% of reading ± 2 digits
100nA
2mA
±1% of reading ±2 digit
1µA
20mA
±1% of reading ±2 digits
10µA
200mA
±1.2% of reading ±2 digits
0.1mA
10A
±2.0% of reading ±2 digits
10mA
Overload protection: F200mA/250V fuse
10A range unfused
TRANSISTOR hFE TEST (0-1000)
Range
Test Range Test Current
Test Voltage
NPN & PNP
0-1000
1b=10
µA
Vce=2.8V
4.1.
Accuracy Calculation
Example: Test reading on 200Vdc range is 56.4V. Accuracy is ±0.5% of reading ±2 digits.
Reading ±2 digits = 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 18
O
C to 28
O
C with a relative humidity of 80%.
5. MAINTENANCE
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 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 BAT 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
MM19/F
FUSE, 200mA
MM19/L
LEAD SET FOR MULTI-METER MM19
6. DECLARATION OF CONFORMITY
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
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: MM19.V2
89/336/EEC EMC Directive
73/23/EEC Low Voltage Directive
93/68/EEC CE Marking Directive
Signed by Mark Sweetman
20th December 2004
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.
01284 757500
www.sealey.co.uk
01284 703534
Web
MM19.V2 - 1 - 201204
