Bort BMM-750C - Инструкция по эксплуатации - Страница 5

5

ATTENTION!

•  In case the parameter value of measured current force is 

unknown, you must set the function switch in the highest 

measurement range and then reduce the range gradually 

if required .

•  If the figure «1» now appears on the display, the measur-

and lies outside the range set .

Insulation testing

(using an additional insulation tester up to 500 V)

1. 

Connect the three banana type plugs VΩ, COM, and 

EXT of the insulation tester, respectively, to the input sock-

ets VΩ, COM, and EXT of the multimeter .

2. 

Set the rotary switch of the multimeter (3) in position 

2000 MΩ .

3. 

Connect test leads, connected to jacks L and E of the 

insulation tester, to the device under test (the voltage in 

the device to be tested must be disconnected) .

4. 

Set the insulation tester switch to ON-position .

5. 

Press the 500V button on the insulation tester . At the 

same time, a red 500V ON indicator will light on it . The 

insulation value appears on the multimeter display . If the 

measurement result is below 19 MΩ, switch the multime-

ter and insulation tester to the measuring range of 20 MΩ 

to increase the measurement accuracy .

6. 

If the insulation tester is not used, set its switch to 

OFF-position and disconnect the test leads from its sock-

ets L and E . It will extend the battery life and eliminate the 

risk of electric shock .

Measuring the resistance (Ω Ohm)

•  Insert the probe with the black cable into the “COM” 

connector, and the probe with the red cable into the “V 

/ Ω” connector .
•  Set the mode switch in position “Ω” and select the meas-

uring range .
•  Connect the multimeter to the circuit in which you plan 

to measure the electrical resistance .
•  Read the electrical resistance value of the circuit on the 

display .
•  The current of the multimeter’s battery is used during 

measuring electrical resistance .

ATTENTION! Do not touch the exposed parts of the 

probes, as this may cause measurement errors .

Mode

Unit of 

measure

Measurement accuracy

200 Ω

0 .1 Ω

±1 .0% value + 10 units of measure

20 kΩ

10 Ω

±1 .0% value + 4 units of measure

Recommendation

•  If the value of the electric resistance of the circuit deter-

mined during the measurement is higher than the value 

of the selected range, the figure “1” will appear on the dis-

play . In that case a higher range value should be selected . 

With an electrical resistance close to 1 MΩ, it may take 

several seconds for the multimeter to stabilize . This is the 

normal behavior of the multimeter when measuring high 

electrical resistance values . 

•  If the circuit is broken, the figure “1” will appear on the 

display . In this case, this means that the resistance of the 

circuit is infinity .

•  If the electric circuit is under current, it is necessary to 

de-energize the circuit before measuring the electrical 

resistance and make sure that all capacitors present in it 

are discharged .

Continuity test

•  Connect the BLACK lead to the «COM» connector socket 

and the RED lead to the «VΩ» connector socket . 

•  Set the mode switch on the «   » range and connect 

the measuring tips to the power circuit to be measured .

•  If the circuit is continuous, a beep will sound .

Changing battery

•  A battery symbol appears on the display if the battery is 

almost discharged . 

CAUTION! The device must be switched off and the leads 

removed before opening the casing of the multimeter .

•  Set the rotary switch on the OFF setting .

•  Remove the rear panel of the multimeter by loosening 

the screws .

•  Replace the battery by an analogous one .

•  Replace and screw the back cover of the multimeter .

MAINTENANCE AND CLEANING

Always remove the battery before servicing and 

cleaning of the multimeter . Never use water or oth-

er fluids to clean the device .

•  Keep the instrument leads and the multimeter clean . 

Never use any liquids to clean the multimeter . Some 

cleaning fluids and solvents (petrol, thinner etc .) can at-

tach or dissolve the plastic . Clean the casing regularly us-

ing a soft piece of cloth, preferably after every use .

•  If the display is difficult to read, replace the battery .

•  In case of failure of the multimeter, contact the service 

division .

Made in China .