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MI 7056 

APPLICATION INSTRUCTIONS 

1.

 

GENERAL DESCRIPTION 

Due to small dimensions and electrical characteristics the MI 7056 
multimeter is intended for a wide range of users. It is especially 
convenient for service workshops where electrotechanical and radio-
television apparatuses are repaired. Its main advantage is a large 
choice of measuring ranges as well as high input resistance. It is 
possible to measure DC and AC voltages and currents, amplification 
or weakening on four-poles and resistance. Measuring wires and 
connection sockets are safe. A rubber border increases mechanical 
resistance of the instrument, and makes the instrument user-friendly. 

2.

 

TECHNICAL DATA 

 

ratings: 23 

 

length of basic scales: 

approx. 87 mm 

 

pointer tilt: 

0 … 100

°∠

 

 

accuracy class: 

2.5 

 

characteristic resistance: 

20 k

 / V

DC

 

6,67 k

 / V

AC

 

 

dimensions: 

104 x 143 x 40 mm 

 

mass: 

approx. 350 g 

3.

 

RATINGS WITH CHARACTERISTIC DATA 

3.1

 

VOLTAGE RATINGS 

DC AC 

Voltage 

Internal 

resistance 

Voltage 

dB

1) 

scale 

Internal 

resistance 

100 mV 

2 k

 

10 V 

-10dB...+22dB 

66,7 k

 

1 V 

20 k

 

30 V 

+10dB 

200 k

 

10 V 

200 k

 

100 V 

+20dB 

667 k

 

30 V 

600 k

 

300 V 

+30dB 

2 M

 

100 V 

2 M

 

600 V 

+40dB 

4 M

 

300 V 

6 M

 

 

 

 

600 V 

12 M

 

 

 

 

1)

 0 dB corresponds to 0.775 V / 600 

 (1 mW / 600 

3.2

 

CURRENT RATINGS 

DC AC 

Current 

Voltage drop approx. 

Current 

Voltage drop 

50 

µ

100 mV 

3 mA 

1,5 V 

1 mA 

500 mV 

30 mA 

1,6 V 

10 mA 

500 mV 

300 mA 

1,6 V 

100 mA 

500 mV 

3 A 

1,8 V 

1A 190 

mV 

 

 

3.3

 

RESISTANCE RANGES 

Measuring range and scale middle 

Max. 

measuring 

current 

2)

 

Battery supply 

source 

x 1 

 ... 35 

 ... 5 k

 

45 mA 

 

x 10 

10 

 ... 350 

 ... 50 k

 

4,5 mA 

1,5 V 

x 100 

100 

 ... 3,5 k

 ... 500 k

 

0,45 mA 

(IEC R6) 

2)

 At battery voltage 1.5 V 

4.

 

ACCURACY AND INFLUENCES 

4.1

 

ERROR AT REFERENCE CONDITIONS 

Stated errors are valid at horizontal position, at ambient temperature 
20

°

C, at sine form of alternating signals of frequency 50 … 60 Hz 

under the condition that the vave of the alternating signal does not 
deviate for more than 1% from the sine curve. 

Current and voltage ratings: 

 

direct and alternate: 

±

 2.5 % of range 

When measuring within the range from 0 to 30 mA, circuit resistance 
should be min. 150 k

 

resistance ratings: 

±

 2.5 % of scale length 

4.2

 

INFLUENCE OF FREQUENCY 

 

all alternating ratings: 

±

 2.5 % within the frequency range 

from 30 Hz to 1 kHz 

4.3

 

TEMPERATURE INFLUENCE 

At modified ambient temperature for 10 K within the range from 0 to 
40

°

 

direct ratings: 

±

 1 % of range 

100 mV / 50 

µ

A: 

±

 2.5 % of range 

 

alternating ratings: 

±

 1.5 % of range 

5.

 

CONFORMITY WITH INTERNATIONAL 

STANDARDS 

 

Electrical safety 

(EN 61010-1)

 

 

Installation catergory: 

CAT

78

 300V max, CAT

8

 600V max

 

 

Degree of pollution: 

2

 

 

Electromagnetic compatibillity 

 

Emission: 

EN 50081-2

 

 

Immunity: 

EN 50082-2

 

6.

 

PROTECTION AGAINST OVERLOAD 

The measuring system is protected against overload with silicon 
diodes. A rating selector switch and a printed circuit are protected 
with F 3.15 A fuse. 

Fuse Switching 

capacity Dimensions 

(mm) 

F 3,15 

IEC 127 

1 kA, 440 V

AC

 

cos 

ϕ

 = 1,0 

 6,3 x 32 

7.

 

BATTERY FOR MEASURING RESISTANCE 

1 x 1.5 V IEC R6; a battery which is protected against the discharge of 
electrolyte is recommended.  

8.

 

GENERAL INSTRUCTIONS 

For correct and safe application of the meter the following data should 
be considered:  

During the measurement put the instrument, which is protected with 
the rubber border, in a horizontal position. Insert a battery in order to 
measure resistance. Remove the rubber protector and the instrument 
base, and insert the 1.5 V battery (IEC R6) into its bed. The battery is 
used only for supplying ohmic ranges. The contacts should be clean 
and reliable. Check the battery condition by setting the ratings selector 
switch to 

 x 1 range. Short circuit connection terminals COM and 50 

µ

A, 100 mV, A, 

, and set final tilt with the knob (0 on 

 scale). If 

this can not be set or if the tilt is not constant, replace the battery. 
Completely switch off the instrument before removing the base. 

 

 

1.

 

A knob for the regulation of the pointer zero position 

2.

 

Ratings selector switch 

3.

 

A knob for zero setting on 

 scale 

4.

 

Connection safety sockets 

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