Besantek BST-IT30 User manual

HIGH VOLTAGE DIGITAL
INSULATION TESTER
BST-IT30
INSTRUCTION MANUAL
SAFETY PRECAUTION !
• Use only on de-energised system.
• Check test leads for defects.
• Always earth circuit under test.
• After testing, allow a few seconds for
instrument to discharge circuit under test.
OPERATING INSTRUCTIONS
1. Depress “ ON ”.
2. Insert leads into the instrument observing colour coding.
3. Clip BLACK lead to earth.
4. Select test voltage and follow display instructions.
CAUTION
5. Touch RED lead to conductor under test. Stop test
immediately if warning message and / or buzzer sound.
This indicates the presence of an external voltage which
must be remove.
Before proceeding, reset the tester by depress “ ON ”.
6. Connect RED lead to conductor and depress “ TEST ”.
( tests up to 99.9S )
7. Display shows test duration, real time bargraph voltage
indication and insulation resistance.

Index
1. Safety Precautions............................
2. Specications....................................
3. Instrument Layout..............................
4. Preparation for Measurement............
5. Functions...........................................
6. Insulation Testing...............................
7. Insulation Resistance Testing...........
8. Maintance and Cleaning Method.......
Page
1-2
3-4
5
6
7-8
9
10
11

-1-
1. Safety Precautions
Electricity can be dangerous - handle it with care.
Carefully read the following information before using
the tester.
1.1 The company will not accept liability for any damage
or injury caused by misuse or non-compliance with
instructions and safety procedures.
This instrument must be used and operated only by a
competent trained person and in strict accordance with the
instructions.
1.2 This instrument must not be used on live circuits. Ensure
all circuits are de-energised before testing. See paragraph
1.6 fomur details of built-in warning features should you be
connected to a live system.
1.3 Never open the tester except for battery replacement. (see
battery replacement section).
1.4 Before use, always inspect the tester and test leads for any
sign of abnormality or damage. If any abnormal conditions
exist (broken test leads, cracked case, display faulty etc...)
do not attempt to take any measurement or use the tester.
Return the tester to your nearest distributor for service.
1.5 No design can completely protect against incorrect use.
Exercise caution when using electricity.
However, the tester has been designed with your safety in
mind.
1.6 The tester has a live circuit warning beeper. If it is
connected to a live circuit of more than 500V, a rapid
pulsating beep will be heard and, in addition, the tester
will display a warning message.
Should this happen, DO NOT proceed to test and
immediately. Depress "Test" again to conrm. (hold
depressed the test button). If live warning presist,
disconnect the instrument from the circuit.

-2-
1.7 Rated enviroment conditions :
(1). Indoor use.
(2). Installation category II.
(3). Pollution degree 2.
(4). Altitude up to 2000 meter.
(5). Relative humidity 80% max.
(6). Ambient temperature 0~40°C.
1.8 Observe the international electrical symbols listed below.
Meter is protected throughout by double
insulation or reinforced insulation.
Warning ! Risk of electric shock.
Caution ! Refer to this manual before using the
meter.

-3-
2. Specications
2.1 Display
2 Lines x 20 characters large L.C.D.
Bar graph shows test voltage-rise and decay.
Test duration is indicated in seconds.
Warning of external voltage presence.
Auto-hold when test stopped and circuit discharged.
Low battery indication.
2.2 Insulation
Both models have four insulation test voltages and are
autoranging. They auto-discharge the circuit after test.
1- 500Vdc - 25000MΩ
2- 1000Vdc - 50000MΩ
3- 2500Vdc - 125000MΩ
4- 5000Vdc - 250000MΩ
Test voltage 500Vdc 1kVdc 2.5kVdc 5kVdc
Measuring 30GΩ 60GΩ 125GΩ 250GΩ
range Autoranging
Accuracy ±5%±2 digits
2.3 Supply
Power 8 x 1.5V "C" size alkaline battery

-4-
2.4 Control
Type CMOS Microprocessor
2.5 Analogue to digital conversion
Type Sucessive approximation
Low current (250uA typical)
Resolution 12 bits (no missing codes)
2.6 Keypad
Type Tactile menbrance switch.
2.7 Connections
Type Color coded sockets
SAFETY PRECAUTION !
• Use only on de-energised system.
• Check test leads for defects.
• Always earth circuit under test.
• After testing, allow a few seconds for
instrument to discharge circuit under test.

-5-
SAFETY PRECAUTION !
• Use only on de-energised system.
• Check test leads for defects.
• Always earth circuit under test.
• After testing, allow a few seconds for
instrument to discharge circuit under test.
OPERATING INSTRUCTIONS
1. Depress “ ON ”.
2. Insert leads into the instrument observing colour coding.
3. Clip BLACK lead to earth.
4. Select test voltage and follow display instructions.
CAUTION
5. Touch RED lead to conductor under test. Stop test
immediately if warning message and / or buzzer sound.
This indicates the presence of an external voltage which
must be remove.
Before proceeding, reset the tester by depress “ ON ”.
6. Connect RED lead to conductor and depress “ TEST ”.
( tests up to 99.9S )
7. Display shows test duration, real time bargraph voltage
indication and insulation resistance.
3. Instrument Layout
Test leads connections
Liquid
crystal
display
Voltage
selection
keys
Clear a fault,
start and stop
the test.
Go to main menu Switches "ON"
the instrument
Reset ( if depressed for less than one second )
switches "OFF" the instrument when depressed
for more than ve seconds.

-6-
4. Preparation for Measurement
Check the following for damages and status.
4.1 Display
Do not use the instrument if the display looks
abnormal.
4.2 Keypad
Visually check the keypad.
A damaged keypad will cause the instrument to
malfunction.
4.3 Test leads
Verify test leads are free of cracks and check
continuity.
Faulty test leads will cause inaccurate readings.
4.4 Batteries
The instrument will operates optimally with
alkaline batteries.

-7-
5. Functions
5.1 Switching "ON"
Switch "ON", by depressing the "ON"
key.
Depressing the "ON" key
will start the instrument,
giving the manufacturer's
name, type of instrument
and part number.
The instrument will deafault
to the selection menu.
6210 IN
..500v to 5kV..
...Insulation...
......Tester......
Select test
5KV, 2.5KV, 1KV, 500V
5.2 Re-starting or resetting the instrument
To re-start or reset the instrument,
depress "OFF" key for not more than
one second, then release it.
5.3 Switching "OFF"
Depress "OFF" key for more than
ve seconds to switch "OFF" the
Instrument.

-8-
5.4 Initialising-starting the test
● Quick test
A quick test ( less than 15 sec )
is done by depressing "TEST" for
less than two seconds.
● Long test
A long test ( up to 99.9 sec ) is
done by depressing "TEST" for
more than three seconds.
5.5 Stopping the test
The test can be stopped at any
time by depressing "TEST" key.
The instrument will then auto-
discharge the circuit and hold the
last stable reading.
Voltage decay can be observed on
the bargraph.
5.6 Main menu-new test-new selection
After termination of a test, the
main menu can be accessed by
depressing the "TEST" key. The
instrument will then display the
voltage selection menu and a new
test can be started.

-9-
6. Insulation Testing
Switching "ON"
Switch "ON", by depressing the "ON" key.
Depressing the "ON" key
will start the instrument, giving
the manufacturer's name, type
of instrument and part number.
The instrument will deafault
to the selection menu.
6210 IN
..500v to 5kV..
...Insulation...
......Tester......
Select test
5KV, 2.5KV, 1KV, 500V
Depress the desired voltage selection key.
Connect the leads then, press TEST to start.
The following examples show the interactive
display of the testers.
Live Warning Message / Beeper
To clear live warning message / beeper,
remove leads from circuit under test and push
"TEST" button until tester goes to selection menu.

-10-
7. Insulation Resistance Testing
Warning : insulation test should be conducted on circuits
that are de-energised. Ensure circuits are not live
before commencing testing.
Turn instrument "ON" by pressing the "ON" button.
The L.C.D. display will come to the following screen.
Select Test
5KV,2.5KV,1KV,500V
Select insulation test voltage. For example, 500V.
The following screen will conrm your selection.
500V 30000MΩ
Follow the interactive screen.
Connect Leads Then,
Press TEST to start
If the system to test is not voltage free, the beep will go on,
the following warning screen will appears. Remove your
leads immediatly.
LIVE WARNING ...
Circuit Live !!!
If the system is not live, the test will start and the following
screen will appear, indicating the test duration and other
factors.
R=1234.5MΩ 12.2s
0500V
If either the operator or the instrument stops the test, the
latest result is "HOLD" on the L.C.D.. To perform an other
test, press "TEST" key.
R=1253.0MΩ 85.2s
0 HOLD 500V

-11-
8. Maintance and Cleaning Method
8.1 Battery replacement
Your batteries are situated under the tester-to
replace; switch "OFF" the instrument.
Unplug the test leads from the tester.
Unscrew the screw situated at the bottom of
the battery cover. Slide the battery cover off the
bottom of the tester.
Remove the at batteries from the batteries
holder.
Observing battery polarity, replace with new
alkaline batteries. Replace the battery cover.
8.2 Cleaning and storage
WARNING
To avoid electrical shock or damage to the
meter, do not get water inside the case.
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.
8.3 Servicing
There are no customer-serviceable parts in
this instrument. Should the instrument require
servicing, please, return-it without batteries
but complete with test leads to your nearest
distributor.