Besantek BST-IT11 Manuale utente
INDEX Page
Instrument Layout................................... 1
Introduction............................................. 2
Safety Notes............................................ 2-3
Features.................................................. 3
Measuring Methods................................. 4-7
Specications.......................................... 8-10
Maintenance............................................ 11-12
-1-
Instrument Layout
OUTPUT
Terminal
LCD
Display
OUTPUT
Terminal
POWER
Indicator
External
Voltage
Indicator
POWER
Switch
TEST
Button
FUNCTION
Switch
Ω Null
Adjust
-2-
1. Introduction
This meter has been designed and tested in
accordance with the CE safety requirements for
electronic measuring apparatus, EN61010-1,
EN61326-1, and other safety standards. Follow all
warnings to ensure safe operation.
2. Safety Notes
●Read the following safety information carefully
before attempting to operate or service the meter.
● Use the meter only as specied in this manual;
otherwise the protection provided by the meter may
be impaired.
●Rated enviromental conditions:
(1) Indoor use.
(2) Installation Category III.
(3) Pollution Degree 2.
(4) Altitude up to 2000 Meter.
(5) Relative Humidity 80% Max.
(6) Ambient Temperature 0~40℃.
-3-
●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.
Alternating current.
3. Feature
●3½ digital LCD (2000 counts).
●68 × 34mm (2.677" × 1.338") large LCD display.
●Three insulation test voltage: 250V, 500V, 1000V
DC.
●External voltage warning indication.
●Automatic circuit discharge.
●Test insulation at rated voltage into a 1 mA load.
●200mA continuity short circuit test current.
●AC voltage measurement.
●Fuse protection.
●Safety protected:
IEC/EN 61010-1 CAT III 500V
EN 61326-1
●Bs16th edition.
-4-
4. Measuring Methods
OPERATION CAUTION
Observe all safety precautions when the FUNCTION
switch is set to either the 200MΩ(250,500V) or the
2000MΩ(1000V) position. Connect the meter test
leads to the circuit under test before operating the
TEST switch. Do not touch the clip ends of the test
leads when the TEST switch is pressed.
Some electrical equipment, especially cables, may
retain an electrical charge when disconnected
from the line. It is good practice to discharge such
equipment with grounding straps, or other suitable
devices, before touching or making connections. The
meter automatically discharge the test circuits when
the spring loaded TEST switch is released.
IMPORTANT
Remove all power to the circuit under test when
making resistance measurements. If any voltage is
present in the test circuit the LED on the meter scale
will light. Immediately disconnect test leads and turn
off power to test circuit.
●FUNCTION switch:
The FUNCTION switch is used to select the range,
or function desired.
-5-
●TEST switch:
The TEST switch is normally OFF, spring loaded,
momentary action switch which "turns on" the meter.
The momentary action is a safety feature. The test
voltage generated by the meter is automatically
discharged when the TEST switch is released.
Always check the following before testing:
The "Battery Low" indicator is not showing.
There is no visual damage to the instrument or test
leads.
●Test lead continuity
Select the CONTINUITY function and 20Ω range.
Short the test leads together.
An over-range ("1") indication will mean that the
leads are faulty or instrument fuse is blown. (See
"Fuse Replacement" section)
●Insulation resistance test:
Warning
Insulation tests should be conducted on circuits
that are de-energised. Ensure circuits are not
live before commencing testing.
-6-
1. Select the required test voltage (250V, 500V or
1000V) by rotating the FUNCTION switch.
2. Connect the test leads to the instrument and to
the circuit to be tested.(See connect diagram)
If the "LIVE CIRCUIT" is light, do not press the
TEST button and disconnect the instrument from
the circuit. The circuit is LIVE and should be de-
energised before further testing.
3. Press the TEST switch. The value of insulation
resistance in megohms will be displayed.
Caution
Never turn the function dial whilst the button is
depressed. This may damage the instrument.
Never touch the circuit under test during
insulation testing.
OUTER
SHEATHING
EARTH
INSULATION
GUARD
CABLE CLORE
LINE
COVERING
Connect Diagram
-7-
When testing is complete ensure that the TEST switch
is released before the test leads are disconnected.
This is because the system may be charged up and it
must be allowed to discharge through the instrument's
internal discharge resistor.
●Continuity discharge (Resistance test)
Warning
Ensure circuit is not live before commencing
testing.
1. Select the 20Ω range by rotating the FUNCTION
switch and connect the test leads to the
instrument. Short the tips of the test leads. Press
and hold down the TEST switch by twisting it
clockwise. The display will show the resistance of
the test leads. Adjust the Ω Null control to set the
reading to zero.
2. Connect the test leads to the circuit under test.
Ensure the circuit is not live by checking that the
live circuit indicator does not lit. Read the value
of resistance from the LCD.
●AC voltage test:
Set the FUNCTION switch to ACV. Connect test
leads to circuit being measured. Press TEST switch
and read the value of voltage from the LCD.
-8-
5. Specications
Insulation Resistance
Test range (DC V) 250V 500V 1000V
Measuring Ranges 0-200MΩ 0-2000MΩ
Resolution 1 count/100KΩ 1 count/1MΩ
Output Voltage on
Open Circuit Rated test Voltage + 10%
Output Current 1mA DC
Power
Consumption
Max. consumption current
Approx. 250mA
Accuracy ±1.5%rdg±5dgt
±(3%rdg+3dgt)
(under
1GΩ/2000MΩ)
±(5%rdg+3dgt)
(under
2GΩ/2000MΩ)
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