Besantek BST-MGR01 User manual
BST-MGR01
Digital Low Resistance Ohm Meter
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INSTRUCTION MANUAL
Test Equipment Depot - 800.517.8431
99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
BESANTEK
&REMEMBER TO CHARGE THE BATTERY!
BESANTEK
1. Safety Rules
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Resolution on the lowest range is 1µohm and on the highest range,
100 milli-ohm.
The meter has 6 measuring ranges, from 2000 micro-ohm to 200.0
ohms.
Measurements are displayed on a large 3½ digit custom liquid
crystal display.
This instrument is powered from it's internal rechargeable battery.
It has a regulated DC constant current source with current of 10mA
100mA and 1A.
During recharge of the battery, the instrument is disconnected from
the battery. Measurements can only be made while not charging.
The instrument supply the current to the resistance being measured
through the C1and C2terminals (C1being +, C2being -).
The voltage drop across the resistance under test is measured by
the potential terminals P1and P2(P1being +, P2being -).
Should the current regulation drops out, the RC Led 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 lights up, it mean that the voltage measured on
the resistance is too high, and therefore over-range.
(Lowering the current by selecting a higher resistance range can
solve the over voltage on RP
.)
The resistance can only be measured precisely when the RPand
RCLeds do not lit. If anyone of these leds lights up, then the
measurement will be inaccurate.
Test Equipment Depot -800.517.8431
99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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The ICCS LED is the LED indicating the Constant Current Source
being OFF. When this led lights up, it mean that the current injection
has been switched OFF (could be over-temperature).
The METER has a built-in custom 3½ digit liquid crystal display
which can be viewed in most lightning conditions.
This display indicates the conditions (Hold, m, buzzer, polarity
condition of load, + or -, automatic decimal point change with range
selection).
The ranges are selected by the 'SCROLL / RANGE' push button.
A test is initiated by pressing the TEST/STOP push-button.
The instrument takes measurements for 10 seconds if the TEST/
STOP push-button is depressed for less than 3 seconds (EnerSave
mode).
If the TEST/STOP push button is depressed for more than 3
seconds, the test will carry on for 60 seconds.
The tester switch "OFF" completely when the OFF push button is
pressed, but The METER has also an auto-off feature
The tester "Hold" the last reading before stopping the test.
The tester is fuse protected and has a crowbar between C1and C2.
This crowbar is activated by voltage. If the voltage is too high, that
crowbar will blow the CFfuse automatically to interrupt the circuit.
The voltage between P1and P2is also protected for over voltage
.If that voltage is too high, the crowbar will blow the PFfuse
automatically to interrupt the circuit.
The tester has a temperature shut down.
The temperature sensing is done on the current regulation transistor.
Should this over-temperature alarm be activated, the ICCS OFF LED
will lit, indicating the current has been shut down.
Allow the instrument to cool down for a while before proceeding
further.
BESANTEK
RANGE
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BESANTEK
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Test Equipment Depot - 800.517.8431
99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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5. Display
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6. Specications
ELECTRICAL
Resistance Ranges
Range: 0 to 2.000mΩ in steps of 1uΩ
0 to 20.00mΩ in steps of 10uΩ
0 to 200.0mΩ in steps of 100uΩ
0 to 2.000Ω in steps of 1mΩ
0 to 20.00Ω in steps of 10mΩ
0 to 200.0Ω in steps of 100mΩ
Accuracy: 0 to 2.000mΩ => ± (5%rdg + 5 dgt)
0 to 20.00mΩ => ± (4%rdg + 4 dgt)
0 to 200.0mΩ => ± (4%rdg + 4 dgt)
0 to 2.000Ω => ± (3%rdg + 4 dgt)
0 to 20.00Ω => ± (2%rdg + 4 dgt)
0 to 200.0Ω => ± (2%rdg + 4 dgt)
Test Current: 2.000mΩ to 200.0mΩ : 1A ± 3%
200.0mΩ to 20.0Ω : 100mA ± 2%
200.0Ω : 10mA ± 1.5%
Maximum Output Voltage: 10V
Response Time: 1secs nominal
Voltage Withstand: 6V AC between any two terminals
Battery Low Indication point: 10V nominal
MECHANICAL
Size: 330 x 260 x 160 mm
Material: Polycarbonate/ABS
Weight (less carrying case): Approx. 3200 g (with battery)
Display: Custom Liquid Crystal
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ENVIRONMENTAL
Operating temperature Range: -15°C to + 55°C
Storage Temperature: -20°C to + 70°C
GENERAL
Safety: EN 61010-1
EN 61326-1
Battery: 12 V rechargeable 12V 2.3Ah
Fuses: 1 X 500mA ( Potential Fuse )
1 X 2A (Current Fuse)
Slow Blow, 250V type
SPARES AND ACCESSORIES
Test Leads
Fuses: 500mA / 250V
2A / 250V
Battery: 12V Rechargeable
Instruction Manual
7. Cleaning
Clean the instrument case with an anti-static cleaner and wipe with
dry cloth.
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Test Equipment Depot - 800.517.8431
99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
BESANTEK
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12. Typical Applications
Measuring the contact resistance of circuit breakers.
Measuring Circuit breaker resistance is very important. If the
resistance of a circuit breaker become too large, than, the current
going through will warm up the circuit breaker (RxI2) and it could
start a re. If the resistance is too high, the power transferred to the
load could be too low and the load could malfunction.
Measuring the bonding of welding points.
Welding point or good connections are the basic of good earthing
and continuity in electrical wiring. This is specially true for protection
conductors. For example lightning protection conductors requires
extremely low resistance to conduct the lighting into the earth.
On aircrafts, the lightning must be conducted from one side to the
other side of the wings by low resistance conductors, instead of
going through the frame of the plane.
These resistance can be checked with this instrument.
Measuring the contact resistance of bolted conductors.
Similarly to bonding of welding points, some times, connections are
done using bolted conductors or using bolted lugs. These contact
resistance can be tested and measured with this instrument.
Measuring the copper resistance fo transformers.
The low resistance of transformer winding can be measured with this
instrument, to ascertain the ohmic component of the winding.
Measuring the earthing conductor resistance.
Earthing conductor Resistance is one of the most important
component of an electrical protection system. The measurement of
its value can be done using this instrument.
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Measuring the earth mat connections resistance.
The Earth mat connections resistance is done using the 4 wires
method, to ensure accuracy of these low resistance.
The earth mat is connected using very low resistance connections to
ensure fault current are passed without or very little resistance.
It is very important to measure these connections, using the 4 wires
methods, to ensure added accuracy and remove errors from the
test leads. Earth mat rely completely on good connections and low
resistance for their effectiveness. Their regular testing and correct
measurement will ensure proper working of the protection systems.
13. Working Principle of The Instrument
This Test Instrument has a regulated current source which injects its
regulated DC current into the low resistance to measure.
The current is injected into the resistance under test through the
terminals C1 and C2.
This Test Instrument has a DC voltmeter which measure the DC
voltage across the resistance to be measured.
The Voltmeter connections are on P1 and P2.
The display shows a number proportional to the ratio of the current
injected and the voltage measured. R=U/I
When the user change the range of the instrument, the current
regulation change, from 10mA to 1A, according to the user selection.
The current selected is shown on its corresponding LED, on the left
of the facia.
When selecting a current, the range is automatically selected by the
processor.
So, selecting a current and a range has the same function and is
using one push button.
The Instrument is processor driven and the software takes care of
the different switching elements inside the circuit.
The product has protection against over-voltage and over-
temperature.
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