Besantek BST-IT111 User manual

DIGITAL INSULATION
MULTI-METER
INSTRUCTION MANUAL
BST-IT111

INDEX Page
Introduction............................................. 1
Safety Notes............................................ 2
Features.................................................. 3
Specications.......................................... 4-5
Instrument Layout................................... 6
Measuring Methods................................. 7-9
Maintenance............................................ 10-11

-1-
1. Introduction
This meter has been designed and tested in
accordance with the CE safety requirements for
electronic measuring apparatus, EN 61010-1,
IEC 61557-1, IEC 61557-2 and other safety
standards. Follow all warnings to ensure safe
operation.

-2-
2. Safety Notes
●Read the following safety information carefully
before attempting to operate or service the meter.
● Use the meter only as specied 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℃.
●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-
3. Feature
●Microprocessor controlled.
●Four insulation test voltages (DC) :
125V, 250V, 500V, 1000V
●The maximum insulation measurement range is
200G ohm @1000V.
●1mA test current on insulation test at nominal
voltage.
●Large LCD (78 × 67mm).
●Auto-ranging.
●Bar-graph indication.
●Backlight function.
●REL(Auto-null) function.
●Auto AC/DC voltmeter.
●Capacitor test.
●Auto-test stop & smart hold.
●Supplied with high quality test leads.
●Safety standard :
EN 61010-1 CAT III 600V
IEC 61557-1 IEC 61557-2
EN 61326-1

-4-
4. Specications
Insulation Resistance(GΩ)
Test voltage (DC V) 125V / 250V / 500V / 1000V
Output voltage on
open circuit Rated test voltage + 10%
Measuring ranges 0-25GΩ/0-50GΩ/0-100GΩ/ 0-200GΩ
Accuracy ±(3%rdg+5dgt)
Output short-circuit
current ≥1.0mA
AC/DC Voltage
Measuring ranges 200.0mV / 2000mV / 200.0V / 600V
Accuracy ±(3%rdg+5dgt)
Resistance
Measuring ranges 20.00kΩ / 200.0kΩ /
2000kΩ / 20.00MΩ
Accuracy ±(3%rdg+3dgt)
Capacitor
Measuring ranges 200.0nF / 2000nF / 20.00uF
Accuracy ±(3%rdg+5dgt)

-5-
Continuity
Measuring ranges 20.00Ω / 200.0Ω / 2000Ω
Buzzer under 10Ω
Open circuit voltage 5V±1V
Short circuit current >210mA
Accuracy ±(3%rdg+5dgt)
General
Dimension 221(L) × 110(W) × 57(D)mm
Weight 676g (batteries included)
Power source 1.5V (AA) × 6 Alkaline batteries
Accesories
Instruction manual
Test leads
Batteries
Carry case
Hand strap

-6-
5. Instrument Layout
(1) LCD
(2) Backlight button
(3) REL button
(4) TEST button
(5) Function rotary switch
(6) SELECT button
(7) HOLD button
(8) " – " terminal
(9) Fuse
(10) " + " terminal
(2)
(3)
(4) (5)
(6)
(7)
(1)
(8)
(9)
(10)

-7-
6. Measuring Methods
OPERATION CAUTION
Observe all safety precautions when you select 125V,
250V, 500V or 1000V position. Connect the meter
test leads to the circuit under test before operating
the "TEST" button. Do not touch the clip ends of the
test leads when the "TEST" button 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 stop testing.
IMPORTANT
Remove all power to the circuit under test when
making resistance measurements.
●Always check the following before testing :
The " " indicator is not showing.
There is no visual damage to the instrument or test
leads.
● Test lead continuity : select the "Ω" range by
rotating the function switch and press "TEST"
button, short the test leads together.
An over-range "O.L" indication mean the leads are
faulty or instrument fuse is blown.

-8-
(1) Insulation Resistance Test :
Warning
Insulation tests should be conducted on
circuits that are de-energised. Ensure circuits
are not live before commencing testing.
a. Select the required test voltage (125V, 250V,
500V, 1000V) by rotating the function switch.
b. Connect the test leads to the instrument and to
the circuit to be tested.
c. Press the "TEST" button, the " " indicator
was shown on the LCD. The value of insulation
resistance in megohms will be displayed.
Be sure turn off power before the test leads are
disconnected. This is because the system may be
charged up and it must be allowed to discharge
through the tester's internal discharge resistor.
(2) Continuity test :
Warning
Ensure circuit is not live before commencing
testing.
a. Select the "Ω" range by rotating the function
switch. Short the tips of the test leads.
Press the "REL" button. The display will show
"zero".
b. Connect the test leads to the circuit under test.
Read the value of resistance from the LCD.

-9-
(3) Voltage test :
a. Select the "600V" or "2000mV" range by rotating
the function switch.
b. Connect test leads to circuit being measured.
c. Read the value of voltage from the LCD.
※600V : AC/DC automatically detection.
2000mV : AC/DC "Select" cutover.
(4) Capactance test :
a. Select the " " range by rotating the function
switch.
b. Connect test leads to circuit being measured.
c. Read the value of voltage from the LCD.
※IEC 61557-2 Operating Error
Measurement Uncertainty
Operating
instrumental
uncertainty
Insulation
Resistance ±(3%rdg+5dgt) < 30%
This specication describes maximum values
accepted by the standard.

-10-
7. Maintenance
Caution
Always disconnect the test leads from instrument
before batteries or fuse replacement.
●Batteries Replacement:
Please replace batteries when the " " indicator
was shown on the LCD.
Disconnect the test leads from the instrument,
remove the battery compartment lid and the
batteries.
Replace with six 1.5V AA Alkaline batteries, taking
care to observe correct polarity.
Replace the battery compartment lid.
●Fuse replacement
Open the fuse compartment lid. Remove the bad
fuse, and replace with the new one.
Replace the fuse cover the fuse compartment lid
before using the meter.
※Fuse (0.5A /690V) 6 × 32mm
●Cleaning and 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.

-11-
WARNING
To avoid electrical shock or damage to the meter, do
not get water inside the case.