Besantek BST-CHK01 User manual
Index Page
1. Warning and safety.............................................. 1
2. Specication ....................................................... 2
3. Safety notes........................................................ 3
4. Checking a RCD test.......................................... 4-6
5. Checking an installation or insulation tester........ 6-10
Checking for the correct applied
test voltage...................................................... 6-7
Checking the reading accuracy....................... 7
Checking the continuity measurement……..... 8-9
Checking for the AC voltage measurement
function........................................................... 9-10
6. Checking a LOOP tester…...............................… 11-12
7. Limited warranty….............................................. 12-13
Due to our policy of constant improvement and development,
we reserve the right to change specications without notice.
1. Warnings and safety
&IMPORTANT NOTE:
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2. Specication
RCD Testing
Range
10mA±4mA Trip,14mA↑ over,150mS±10%
30mA±12mA Trip,42mA↑ over,150mS±10%
150mA±60mA Trip,210mA↑ over,30mS±10%
Insulation Testing
Range 1MΩ / 9.9MΩ / 99MΩ
Accuracy ± 1%
Max. Testing 1.2kV
Continuity Testing
Range 0.5Ω / 2Ω / 10Ω
Accuracy ± 0.05Ω / ± 0.1Ω / ± 0.2 Ω
Max. Current 300mA
LOOP Testing
Range Supply Loop / Supply Loop + 1Ω
Accuracy 0.45Ω ± 0.05Ω / 1.45Ω ± 0.05Ω
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
3. Safety notes
4.
N
& IMPORTANT NOTE:
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-4-
4. Check RCD tester
A. CHECKING A RCD TESTER
RCD tester simulates a current between live and earth to trip
TEST BOX.
The disconnect time of relay is shown on RCD tester usually in
milli-seconds if TEST BOX and RCD tester select the correct
current and the correct time range.
Generally, the tester has several current ranges plus a ‘5l’
function which multiplies the current range set by 5.
As switches can switch off, it is important to check more than
one current range. Leaving the instrument on the same range
in every check.
If too much current is induced into the tester, the RCD will TRIP.
For example, If you are checking a circuit which should have a
30mA RCD and the faulty range of your tester is on the 300mA
range, this will open any trip up to 300mA.
Test with both a long and a short trip time to ensure that it is
correct. It is less important if the tester has a ‘positive/negative’
cycle switch. This will be better for timing measurement.
The unique features of the electronic trip of TEST BOX allow
all the above to be tested quickly and easily. Accurate timing
is ensured as the time period is not dependant on the current
transition and an over-current LED can be lit. The positive/
negative switch can be checked, as the time period will be
10mS longer than starting on the negative cycle.
If the TEST BOX RCD is "TRIPPED", it is almost no check the
correct operation of the tester. There is no indication of over
current and the timing accuracy is poor need to change current
range on the tester.
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Select the lowest test voltage (100V or 250V) range on the
tester. Press the “test” button on the tester. Note the voltage
LED (100V or 250V) on the TEST BOX. It should be lit with the
same range on the tester. Record the reading on the tester.
Repeat the same step on the other test voltage ranges.
NOTE: FOR THE LEDS TO BE PROPERLY LIT ON THE
TEST BOX, THE RED TERMINAL MUST BE
POSITIVE.ON SOME TESTERS THE RED LEAD IS
NEGATIVE, THE LEADS MUST BE REVERSE.
B. CHECKING THE READING ACCURACY
Connect the tester to the 1M terminal on the TEST BOX as
shown above. Start with the lowest voltage range and record
the reading on the tester. Allow from 0.99 MΩ to 1.01 MΩ,
± 0.01MΩ.
Connect the tester to the 9.9M terminal on the TEST BOX.
Select the 500V test voltage range and record the reading on
the tester. Allow from 9.8 MΩ to 10.0 MΩ, ± 0.05MΩ.
Connect the tester to the 99M terminal on the TEST BOX.
Select the 1KV test voltage range and record the reading on
the tester.
Allow from 98 MΩ to 100 MΩ, ± 0.5MΩ.
Common Problems Solution
Only the lower Test
Voltage LED lit Low battery.
Tester reads over
range all the time
Test leads open circuit. Note some
testers require using the correct test
leads.
Test Voltage LEDs
do not light up
A: TEST BOX not plugged in.
B: Tester faulty or low battery.
C: Test leads open circuit, try to
short tester leads together and
check zero.
D: Try to reverse test leads.
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