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Megaohmmeter M4100 / 1 - portable instrument for measuring the electrical resistance of electrical insulation. This insulation resistance meter (ohmmeter) has a measuring range from zero to several million ohm (ohm - a unit measuring the electrical resistance), and accordingly referred megger. In everyday life, this name has got many variations: megger, megger, megger, megameters, shrews. M4100 / 1 - series designation and model of the device.
testers are used to determine the resistance and find places insulation fault de-energized electrical. Places available electrical damage due to the portable stand-alone execution meter - unit is equipped with a built-in electromechanical generator and plastic case provides the security and ease of transportation. Megger M4100 / 1 is mounted in a plastic case. Generator, the rectifier and the meter are arranged inside the housing. Top housing is closed on which the terminals and the overview of the scale window protected by glass. On the right side of the device is foldable handle of the electromechanical generator.
For the measurement it is necessary:
1) Remove the instrument from its case and set horizontally on a solid base; 2) make sure that the electrical installation is de-energized (if necessary - grounded), and on the device itself is not pollution, contact terminals are clean and dry, as well as the leads of the device and where they connect to the electrical installation; 3) If you want to test the functionality of the device; 4) connected to terminal contact elements or electrical connecting wires connected to the electrical installation; 5) is expanded to the operating position and to rotate the handle of the generator with its nominal speed (120 rev / min.).; 6) Turn the handle of the electromechanical generator to produce a reading on an appropriate scale.
When measuring insulation resistance at the limit "MΩ" measured resistance is connected to the terminals "L" (line) - "land designation" (the earth).
When measured on the "KΩ" limit jumper is available on one of the connecting conductors is connected to terminals "land designation" - "L", and the measured resistance - between terminals "land designation" - "KΩ".
The principle of operation megger is the following: a speed of 120 rev / min of the generator armature when the handle reaches the nominal rotation speed. On the shaft of the armature is placed centrifugal regulator providing constancy armature voltage with increasing rotational speed of the generator above the nominal. With an increase in measured resistance shunt effect is reduced beyond the working circuit, and the voltage at the measured resistance close to the nominal. Generated by rotation of the handle of the electromechanical generator of alternating current is converted to DC rectifier, after which a constant current flows through the rectifier from the frame (working and opposing) measuring mechanism, additional resistors and insulation resistance is measured. Depending on the value of the measured insulation resistance, the working frame current flowing in the circuit will change, causing deviation movable part, by an angle corresponding to the measured resistance. Through the opposing frame ratio-meter flows a constant current, creates a restoring moment. Construction element movable part - arrow deviating indicates the corresponding measured resistance value at the corresponding scale. The value of the scale is read through the viewing window in the lid of the appliance by a person taking the measurements.
Basic metrological and specifications shown in Table 1. & nbsp;
Table1
< tr>
Name characteristics
value characteristics
measurement range, k (MW)
0 to 200 (0 to 100)
Working part of the scale, clod (MW)
0 to 200 (0 to 20)
< center> Rated output voltage, V
90 to 110
scale length, mm no less
80
accuracy < td>
1,0
Response time, with no more than
4
Output accuracy in the working part of the length scale the working end of the scale,%
± 1
Power megger by a built of the electromechanical generator < / center>
megaohmmeter Weight with case, kg, no more
4,9
dimensions megger (length x width x visota) mm, not more than
200 x 155 x 140
Operating conditions of use:
- temperature ambient ° C,
from minus 30 to 40
- relative air humidity at an ambient temperature of 30 ° C,%
90 & nbsp; & nbsp;
Package megaohmmeter M4100 / 1 is given in Table 2 & nbsp.;
Table 2
Name
Number
Megger M4100 / 1
1 pc.
wires connecting
2 pcs.
passport
1 pc & nbsp.; & nbsp;
A variety of characteristics of the instrument Series M4100 / ... & nbsp;
Device Modification
Measurement range
Working portion of the scale
Rated output voltage, V
kW / MW
kW / MW
M4100 / 1
0-200 / 0-100
0 -200 / 0-20
100 + 10
M4100 / 2
0-500 / 0-300
0-500 / 0-50
250 + 25
M4100 / 3
0-1000 / 0- 500
0-1000 / 0-100
500 + 50
M4100 / 4
0-1000 / 0-1000
0- 1000 / 0-200
1000 + 100
M4100 / 5
0-2000 / 0-3000
0-2000 / 0-1000
2500+ 250
In comparison with similar devices megohmmeter M4100 / 1 has several advantages: - electromechanical display system which allows not only to read the measured value, but also to observe the dynamics of its establishment; - offline, provided by a built-in electromechanical generator; - simplicity and high performance, providing an extended operational period and a low probability of breakage.
