User Manual of BM3548 and BM3549
Insulation Tester and Multimeter
Distinguished users:
Thank you for purchasing the meter of our company. To use the meter
correctly, please read the operating instructions thoroughly and carefully before
use it, especially the section of “Safety information”.
Please keep the operating instructions in a safe place after reading it, putting it
where the meter is or keeping it in handy for future reference.
Attention: A test cable is provided for the meter. It is not allowed to
perform insulation test by holding the test cable with your hands. Ensure
that the to-be-tested object is securely clamped and keep your body away
from the circuit before press the TEST key to output high voltage.
I. Overview
Welcome to use the product!
BM3548/49 digital multimeter with auto range selection is a real digital
insulating resistance digital millimeter. It has features of complete
functions, high accuracy, reliability in operation, and convenience in use. Output
test voltage can be switched among 250V/500V/1000V/2500V, depending on
different models. An ordinary insulating resistance meter can not measure the
output high voltage of its own. When the output high voltage of the insulating
resistance meter doesn’t conform to the rated value, it is not easy for the user to
find the unconformity so that deviation of the measured result is over large
sometimes and causing hidden troubles in safety. BM3548/49 can monitor the
output high voltage in a real-time way. At any time, the user can observe actual
measurement voltage that is output by the meter, effectively avoiding
misjudgment caused due to output voltage not conforming to the rated value.
The measurement range of the meter can reach up to 40G
Ω
. The measurement
time can be set up according to requirements. After a measurement is completed,
the measured result can be kept automatically. Functions of the digital
multimeter include AC/DC voltage, current, resistance, capacitance, frequency,
diode, and ON/OFF measurement. The functions of the digital multimeter are
completely separated from those of the insulating resistance tester. When use
functions of the multimeter, you need not be worried that you would suffer
electric shock due to high voltage generated by the insulating resistance tester.
The product is applicable to measurement of the insulating resistance of various
insulating materials and electric equipments such as transformers, motors,
cables, switches, and electric apparatuses. It is also applicable to maintenance,
test, and inspection of various electric equipments. It is compact in structure,
convenient to carry, and an ideal electrical and electronic testing meter of yours.
II. Safety information
(1) Description of safety marks:
Warning: important safety information the user must read
！
Danger: high-voltage electric shock is present
！
Double-insulated protection
(2) Read the operating instructions carefully before use the meter.
(3) It is strictly prohibited to use the meter before its rear cover is put in place.
Otherwise, it might cause an electric shock.
(4) Check and make sure the insulating layer of the test cable is in good
condition without any breakage.
(5) To avoid electric shock, do not touch the test cable and the circuit under test
when performing a test.
1
(6) Make sure one end of the test cable is securely inserted into the terminal.
(7) During test, any range must not exceed its specified maximum input value.
(8) During test, do not operate the switch knob for changing a range to avoid
damaging the meter.
(9) DC voltage over 50V or AC voltage over 36V can cause danger of electric
shock. Be careful when taking measurement.
(10) Before performing insulation test, make sure the range selection switch has
been set within an appropriate voltage range.
(11) Do not perform insulating resistance test in a combustible environment.
Spark may cause explosion.
(12) Stop using the meter, if its case or test cable is broken during use and the
metal is exposed
(13) When open the rear cover for changing battery, make sure the test cable has
been removed out of the test terminal and the range switch switched to
OFF position.
(14) Take the battery out when the meter will not be used for a long time.
(15) When “
- +
” is displayed in the meter, it is necessary to change the battery
in time to ensure measurement accuracy.
III. Name and function of parts (see the figure)
1
．
Function switch knob
Switch among power ON/OFF, measurement voltage of the insulating
resistance, and various functions of the multimeter.
2
．
TEST/STOP key:
it is used to measure the insulating resistance
RANGE key: it is used to switch between hand-operated and auto range mode
as the meter is used as the multimeter. The function is not available when the
meter is used as the insulating resistance tester. On startup, the meter is preset
to auto range mode. Press the key to switch to hand-operated range mode. In
hand-operated range mode, every time press the key, the range goes up one
level until to the maximum level. After the maximum level is reached, every
time press the key, the range goes to the minimum level. The process is
repeated. If press and hold the key over 2 seconds, the meter is switched to
auto range mode.
3
．
SELECT key:
it is used to set the measurement time of the insulating
resistance as well as various function switch of the same position
4
．
DH/BL key
Data hold/backlight function: press the key to lock the displayed result.
Press it again to restore normal measurement (when OL is displayed in the
meter, Hold function is not available). Press and hold the key for 2 seconds to
switch between backlight on/off (in adjustment mode, backlight is not
available).
5
．
L (LINE)
input terminal (connected to line terminal of the to-be-tested
object).
6
．
V/
Ω
/mA/Hz/CAP
input terminal: common positive input terminal of the
digital multimeter;
7
．
COM/G
input terminal (COM is common EARTH of the multimeter /G is
shielded terminal of the insulating resistance).
8
．
E (EARTH)
input terminal (connected to EARTH terminal of the
to-be-tested object)
9
．
Liquid crystal display
Small 8888
: measured value of high voltage
of the insulating resistance
-8888
: measured value of various functions
Min
: measurement time of the insulating
resistance (minute)
OL
: overflow display, indicating the measured
value exceeds the maximum display value.
ERR
: indicating that serious current leakage
or short circuit occurs to the equipment
- +
: Battery capacity is insufficient
10 Indicator light of high voltage
11 Holding box of the test cables
12 Ring used to fasten the hanging strip
IV. General characteristics
(1) Auto range: “OL” will be displayed for overload.
(2) Display mode: Liquid crystal display; maximum display: 4000
；
(3) Sampling rate: 2 times per second
；
(4) The meter can display actual insulation test voltage. LED light is used to
indicate high voltage output status
；
(5) Operating environment: 0
°
C-40
°
C, less than 75%RH
；
(6) Storage environment:-10
°
C-60
°
C, less then 80%RH
；
(7) Maximum power consumption: 4.5W; minimum power consumption 18mW.
(8) Indication for insufficient battery capacity: “
- +
” is displayed
；
(9) Power supply: 6 pieces of AA 1.5V battery (LR6×6)
(10) Auto power off: The multimeter is turned off automatically in approx. 15
minutes after it is turned on if no key is pressed or the knob is not turned.
(11) External dimension: 170(length)×156(width)×64(height)mm
