Besantek BST-MGR10 User manual


BESANTEK

BST-MGR10


   
    


C
lmA HO
 
 
 
 



 

 



ON -
INSTRUCTION MANUAL
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

INDEX
1. Safety rules................................................
2. General description....................................
3. Front panel layout.......................................
4. Preparation for use....................................
5. Preliminary checks.....................................
6. Precautions................................................
7. Measuring..................................................
8. Simplied measurement.............................
9. Applications................................................
10. Test leads.................................................
11. Thermal effects.........................................
12. Fuses replacement...................................
13. Input limits & protections..........................
14. Specications...........................................
15. Spares & accessories...............................
16. Limited warranty.......................................
17. Cleaning & storage...................................
18. Battery & fuse replacement......................
Page
1-2
2-4
4
5
5-6
6
7
8
9
9-10
10-11
11-12
12
13-14
14
14-15
16
16

-1-
1. Safety rules
The meter has been designed with safety in mind. However,
no design can completely protect against incorrect use.
Electrical circuits are dangerous and lethal through lack of
caution or poor safety practice. The following rules should
reduce the danger :
●Read the User's manual carefully and completely before
using the meter. Fully understand the instructions before
using the meter. Follow the instructions for every test.
Take all the necessary precautions. Do not exceed the
limits of the meter.
●The circuit to be tested must be de-energised and
isolated before connections are made to it.
●Do not use test leads, probes or crocodiles/aligators
clips that are dirty, damaged or have broken or cracked
insulation.Such accessories should be removed and
repaired immediately.
●Always disconnect the test leads before replacing any
fuse. Always replace the fuse with the type specied and
ensure that they are correctly tted.
●Double check the switch settings and leads connections
before measuring. Make a sketch to ensure proper
operation and principle of measurement is correct and
well understood.
●Do not touch any exposed wiring, connections or other
"live" parts of an electrical circuit. If in doubt, check the
circuit rst for voltage before touching it.


BESANTEK



 




 




  
 


 




 

 
 

  
  

-3-
Should the current regulation drops out, the RCLed will lit,
indicating that the resistance in the current circuit is too
high. (Lowering the current by selecting a higher resistance
range can solve the regulation.)
Should the RPLed lit, that mean that the voltage measured
on the resistance is too high, and therefore over-range.
The resistance is measured precisely when the RPand
RCLeds do not lit. If anyone of these leds lit, then the
measurement can be inaccurate.
The meter has a built-in custom 3½ digit liquid crystal
display can be viewed in most lightning conditions. This
display indicates the differences conditions (Hold, m,
buzzer, polarity condition of load, + or -, automatic decimal
point change).
The ranges are selected by a 5 position rotary switch, and a
test is initiated by pressing the ON push-button.
The meter takes measurements for 10 seconds if the "ON"
"TEST RP" button is depressed for less than 2 seconds. If
the same push button is pressed for more than 3 seconds,
the test will carry on for 60 seconds.
The meter switches "OFF" completely when the rotary
switch is in the "OFF" position.
The meter will hold the last reading before stopping the test.
The tester is fuse protected and has a crowbar between C1
and C2.
This crowbar is activated by voltage. If the voltage is
too high, that crowbar will blow the fuse automatically to
interrupt the circuit.


BESANTEK

2 




  
3. Front panel layout








Current/Range Table
 
 


-5-
4. Preparation for use
When unpacked, the meter should be inspected for any
visible signs of damage, and the preliminary checks
described in the user's manual should be performed to
ensure that it is operating correctly. If there is any sign of
damage, or if the meter does not operate correctly, return it
to your nearest supplier.
5. Preliminary checks
Check the battery
●If the battery symbol is shown on the LCD, then replace
the batteries with new alkalines batteries before
proceeding.
Check the current regulation :
●Connect the current leads to C1and C2.
●Select a range, and short the current test leads. The RC
led should go off, indicating that the current regulation
is ok.
Check the voltage measurement:
●Connect the potential leads to P1and P2.
●Short the P1and P2. The display should indicate 0000.
●Remove the short from P1and P2and C1and C2. Touching
the potential test leads P1to C1and P2to C2, the RPLED
should lit, indicating an over-voltage or over-range.
This proving test can be repeated on all the ranges if need
be.
You can also check the polarity indication of the milli-
voltmeter by touching the potential test leads P1to C2and
P2to C1, the RPled should lit, indicating an over-voltage or
over-range. The - indicator should be indicating - on the
LCD, showing the polarity change.

-6-
Total check can be done by shorting all the test leads
together C1, C2, P1, P2. The display should indicate close to
0000 (depending of the crocodiles clips used and how they
are shorted). Both RCand RPLED should be OFF, indicating
that everything work ok.
6. Precautions
●Always ensure that the circuit to be measured is switched
"OFF", isolated and completely de-energised before
connecting the test leads.
●If it is probable that the instrument's protection has been
impaired due to electrical, mechanical or environmental
damage, it must not be used. It should be returned to
your nearest distributor or agent for checking and repair.
●To prevent damage to the liquid crystal display, the
minimum storage temperature of -20°C must be
observed. It should also be noted that below 0°C the
operation of the LCD will be sluggish.
●If the exterior of the meter requires cleaning, it should be
done with a sponge and a mild solution of detergent and
water.
●Other mechanical cleaning agents must not be used.
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com


BESANTEK

7. Measuring

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-7-

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-8-

-9-
9. Applications
The digital milli-ohmmeter, with its measuring range of
100 µohms to 2000 ohms, is suitable for a wide range of
applications such as :
●Measuring the winding resistance of electric motors,
generators and transformers.
●Bond testing in mines, aircraft, railways, ships, domestic
and industrial wiring installations.
●Measuring the ring main continuity testing in industrial
and domestic wiring installations.
●Measuring resistance in electronic equipment such as
shunts, pcb tracks, switch and relay resistance.
●Checking compression joints on overheads lines.
●Testing and maintenance of switchboard /sub-station
equipment on such items as fuses, joints, contacts and
bonds.
10. Test leads
The test leads supplied with the meter are suitable for
connecting to conductors up to 17mm in diameter or bus
bars 17mm tick. There will be,instances where the item
being measured require larger jaws, and the user is advised
to make up his own leads. There will be occasions when
longer leads are required due to the geometry of the item
being tested. Some guidance notes should assit in the
assembly of such leads :

-10-
Length of the potential leads should be as short as
possible.
Insulated 16/0.2mm, tinned copper wire is recommended.
The two potential leads should have the same length to
minimise inaccuracies due to unbalance.
SUPPLIED POTENTIAL TEST LEADS
P1
+test lead is of Red color, shrouded, 4mm safety plug
which at one end have a crocodile (alligator) clip for
connection to the resistance to be measured. The other end
plugs into the meter (4mm shrouded) color coded sockets.
P2
-test lead is of Blue color, shrouded, 4mm safety plug
which at one end have a crocodile (alligator) clip for
connection to the resistance to be measured. The other end
plugs into the meter (4mm shrouded) color coded sockets.
SUPPLIED CURRENT TEST LEADS
C1
+test lead is of Green color, shrouded, 4mm safety
plug which at one end have a crocodile (alligator) clip for
connection to the resistance to be measured. The other end
plugs into the meter (4mm shrouded) color coded sockets.
C2
-test lead is of Black color, shrouded, 4mm safety
plug which at one end have a crocodile (alligator) clip for
connection to the resistance to be measured. The other end
plugs into the meter (4mm shrouded) color coded sockets.
11. Thermal effects
Temperature can have a signicant effect on the
performance of a digital milli-ohmmeter due to the
temperature coefcient of the resistance under test and
thermal EMF's across the dissimilar conductors.

-11-
Most conductors have a large temperature coefcient of
resistance.
For example : 0.4%/°C for copper. A copper conductor that
has a resistance of 10.00m ohm at 20°C will increase to
10.40m ohm at 30°C. This change should be taken into
account when making measurements.
A current going through a resistance will also elevate
its temperature. So duration of the test can change the
resistance.
When measuring the resistance of item, such as current
shunts, which have joints of dissimilar conductors, thermal
EMF can affect the accuracy of the measurement. This
condition can be detected if the reading alters when the
leads are reversed. To compensate for this effect, the
average of the two readings should be taken as the true
measurement.
12. Fuses replacement
There are three fuses :
●Power Supply Fuse
The power supply fuse is situated under the tester. Open
the battery compartment, and replace the fuse with the
same type (0.5A, 250Vac, Slow Blow)
●Current Circuit Fuse
Fuse protection is provided on the current terminals.
This fuse is situated under the Printed Circuit Board. To
access it, you need to unscrew the four mounting screws
which are holding the font panel. Two os these screws are
located under the foots, and the two others are located
inside the battery compartment.

-12-
The fuse is automatically blow by the crowbar, should
voltage be present on the resistance under test. This is to
prevent damage to the instrument.
It is indicative of this fuse being blown is the RCLed stays
"on". (HBC, 0.5A, 250Vac, Slow Blow)
●Potential Circuit Fuse
Fuse protection is provided on the potential terminals.
This fuse is situated under the Printed Circuit Board. To
access it, you need to unscrew the four mounting screws
which are holding the font panel. Two of these screws are
located under the foots, and the two others are located
inside the battery compartment.
The fuse is automatically blow by the crowbar, should
voltage be present on the resistance under test. This is to
prevent damage to the meter.
If the preliminary tests does not lit RPthis is indicative of
this fuse being blown. (HBC, 0.5A, 250Vac, Slow Blow)
13. Input limits & protections
The maximum continuous voltage which can be applied
across the potential and current leads is around 10.7V.
Applying more than that voltage will automatically blow their
respective fuses.
However, the crowbar trigger can be factory adjusted for
your application.
We have specially selected that method to stop damaging
the instrument, should it be misused.

-13-
14. Specications
ELECTRICAL
Measuring Ranges
0-200.0m ohms in steps of 100µ ohm
0-2000m ohms in steps of 1m ohm
0-20.00 ohms in steps of 10m ohm
0-200.0 ohms in steps of 100m ohm
0-2000 ohms in steps of 1 ohm
Accuracy
0.5% of reading ±2 digits over the operating temperature
range, -15°C to +55°C, with the supplied test leads.
Test Current
1mA => 2000 ohms range.
10mA => 200 / 20 ohms ranges.
100mA => 2000m / 200m ohm ranges.
Test Current Accuracy
±0.1%
Protection Fuses
Mains = 0.5A, HBC, 5 x 20mm, DIN
Current = 0.5A, HBC, 5 x 20mm, DIN
Voltage = 0.5A, HBC, 5 x 20mm, DIN
Mechanical
Case Height : 110mm
Case Width : 250mm
Case Depth : 190mm
Weight : 1.500kg
Safety Standard
EN 61010-1 EN 61326-1
EN 61326-2-1 EN 61326-2-2

-14-
Rated environmental conditions
(1)Indoor Use
(2)Pollution Degree 2.
(3)Altitude up to 2000 meter.
(4)Relative humidity 80% max.
(5)Ambient temperature 0°C~40°C.
15. Spares & accessories
At the date of printing this user's manual, accessories were
not yet available. Please contact the factory for further
information.
Spares are available from your nearest distributor.
16. Limited warranty
We warrant the product manufactured by us to be free
from defective material or factory workmanship and agree
to repair or replace this product which, under normal use
and service, disclose the defect to be the fault of our
manufacturing, with no charge for parts and service. If we
are unable to repair or replace this product, we will make a
full refund of the purchase price. Consult the user's manual
for proper instruction regarding use of this instrument.
Our obligation under this warranty is limited to repairing,
replacing or making refund of this test equipment which
proves to be defective within 12 months from the date of
original purchase.

-15-
This warranty does not apply to any of our products which
have been repaired or altered by unauthorized persons in
any way so as, in our sole judgement, to injure their stability
or reliability, or which have been subject to misuse, abuse,
misapplication, negligence or accident or which have had
the serial numbers altered, defaced or removed.
Accessories, not of our manufacture used with this product,
are not covered by this warranty.
All warranties implied by law are hereby limited to a
period of 12 months, and the provisions of the warranty
are expressly in lieu of any other warranties expressed or
implied.
The purchaser agrees to assume all liability for any
damages or bodily injury which may result from the use
or misuse of the product by the purchaser, or it's user, his
employees, or others, and the remedies provided for in this
warranty are expressly in lieu of any other liability we may
have including incidental or consequential damages.
We reserve the right to discontinue models at any time, or
change specication, price or design, without notice and
without incurring any obligation.

-16-
17. Cleaning & storage
Periodically wipe the case with a damp cloth and detergent
: do not use abrasives or solvents.
If the meter is not to be used for periods of longer than 60
days, remove the batteries and store them separately.
18. Battery & fuse replacement
Battery Replacement
●The meter continuously monitors the battery voltage and
indicates when the batteries need to be replaced.
●The tester's battery is situated under the tester.
●Disconnect the test leads from the instrument and
remove the battery cover and the batteries.
●Replace with eight 1.5V AA pen light batteries, taking
care to observe correct polarity.
●Alkaline batteries are recommended.
●Replace battery holder and the battery cover.
Fuse Replacement
●The fuse is located under the battery holder.
●To replace fuse, open the battery cover. Then remove
and replace the fuse located under the battery holder.
● Only replace with same fuse specication. (0.5A/250V)

-17-
CAT IV - Is for measurements performed at the source
of the low-voltage installation.
CAT III - Is for measurements performed in the building
Installation.
CAT II - Is for measurements performed on circuits
directly connected to the low-voltage
installation.
CAT I - Is for measurements performed on circuits not
directly connected to mains.
Due to our policy of constant improvement and development, we reserve the
right to change specications without notice.
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com