Bort BMM-750C - Инструкция по эксплуатации - Страница 4

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•  Remove the instrument leads immediately, if you smell 

burnt cable insulation .
•  Replace the battery in time to prevent electrolyte from 

leaking into the multimeter . 
•  Do not connect the voltage source to the multimeter if 

the mode switch is set to “Ω” or “

”!

•  Use the multimeter only if the housing is closed .
•  Use the multimeter only for measurements of the class 

I or II .
•  Do not use the multimeter for measurements in the class 

III or IV . Do not connect voltages higher than 1000 V DC or 

750 V AC to the measuring device .

OPERATION

Before putting in service

•  In case the voltage and/or the current to be measured 

is/are unknown, set the rotary knob on the largest 

measuring range . If the accuracy on the rotary knob is 

insufficient, set on a lower range and so on .
•  If the device is not going to be used temporarily, put the 

rotary knob in the OFF position .
•  The switching of the multimeter is different for measuring 

voltage and for measuring current . Parallel connection in 

voltage measurement and series connection in current 

measurement . In the latter case, a conductor in the power 

circuit to be measured must be interrupted .
•  To measure voltage, connect the multimeter shunt . To 

measure the current strength, connect the multimeter 

to the circuit loop to loop, to break the measured circuit, 

since the current must pass through the multimeter .
•  If, for example, you measure voltage, do not set the 

mode switch to “Current Measurement” . In this case, you 

may damage the multimeter and cause a short circuit .
•  Never connect a voltage higher than 1000 V DC or 750 V 

AC to the measuring device .

MEASUREMENTS

Measuring direct voltage (V DC)

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

and the RED lead to the «V/Ω» connector socket .

•  Set the FUNCTION switch on the desired «V» setting and 

connect the leads to the voltage source to be measured 

or measuring points . Observe correct polarity (red is + 

and black is -), otherwise the display shows a minus sign 

before the value .

•  Read offthe measured value in Volt .

Mode

Unit of 

measure

Measurement accuracy

1000 V

1V

± 1,2% value ± 5 units of 

measure

Input resistance 9 MΩ

Overload protection DC 1000 V or AC 750 V (Continuously at 

all limits).

Hints

•  In case the voltage range is unknown, you must put 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 . The FUNCTION switch must 

be switched to a higher range .

•  The maximum input voltage is 1000 V DC . Higher volt-

ages cannot be measured . Proceed extremely cautiously 

with the measurement of high voltages .

Measuring alternating voltage (V AC)

Connect the BLACK lead to the «COM» connecting point 

and the RED lead to the «V/Ω» connecting point .
Set the FUNCTION switch on the desired «V» setting and 

connect the leads to the voltage source to be measured 

or measuring points . The polarity of the measuring tips is 

not relevant .
Read off the measured value in Volt .

Mode

Unit of 

measure

Measurement accuracy

750 V

1V

±2,0% value ± 5 units of measure

Input resistance 10 MΩ. Frequency range 40-1000 Hz. Over-

load protection AC 750 V Effective value or DC 1000 V peak 

value (constantly in all ranges).

Hints

•  In case the voltage range 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 . The function switch must 

be switched to a higher range .
•  The maximum input voltage is 750 V effective value . 

Higher voltages cannot be measured . Proceed extremely 

cautiously with the measurement of high voltages .

Measurement of current in an alternating current cir-

cuit (A AC).

Set the rotary switch to the appropriate position in sector 

A . Press the trigger to open the current clamps and close 

them around 

one

 conductor

 (FIG. 3).

If the display shows a single symbol “1”, this means that 

the measuring range has been exceeded . It is necessary to 

switch the instrument to a higher measuring range .

Mode

Unit of 

measure

Measurement accuracy

200 A

100 mА ±2,5% value + 13 units of measure

1000 A

1 А

±2,5% value + 8 units of measure

(for 800 A or less)

Overload protection AC 1200 V during 60 s. Frequency range 

50...60 Hz. Indication: average value (rms).