Опис
Megaohmmeters are designed to measure the insulation resistance of electrical circuits that are not under voltage and to measure the effective value of alternating or constant voltage on the measured object. Megohmmeters provide the capacity discharge of the object after the measurement.
Technical characteristics
Modifications, the insulation resistance measurement range, the measured voltage range and the values of the measuring (output) voltages on the contact sockets of the megohmmeters with the external circuit open are given below:
|
Modification |
Measuring range |
The measuring voltage between the contact sockets for connecting the measurement object, V |
|
|
insulation resistance, MW |
voltage, V |
||
|
ЭС0210/1 ЭС0210/1-Г |
0 – 5
5 – 1000 |
0 – 600 |
100 +10 250 +25 500 +50 |
|
ЭС0210/2 ЭС0210/2-Г |
0 – 5
0 – 50 50 – 10000 |
0 – 600 |
500 ± 50 1000 ± 100 2500 ± 250 |
|
ЭС0210/3 ЭС0210/3-Г |
0 – 50
50 – 10000 500 – 100000 |
0 – 600 |
500 ± 50 1000 ± 100 2500 ± 250 |
| Note 1. For ЭС0210/1, ЭС0210/1-Г voltage at rated current is indicated.
Note 2. For ЭС0210/2, ЭС0210/2-Г, ЭС0210/3, ЭС0210/3-Г the voltage is indicated with the contact sockets open. At the rated current, the voltages will be, respectively, not less than: 300 V, 700 V, 1500 V. |
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The nominal current for the megaohmmeter of modifications ЭС0210/1, ЭС0210/1-Г is not less than 1 mA, for the megohmmeter of modifications ЭС0210/2, ЭС0210/2-Г, ЭС0210/3, ЭС0210/3-Г not less than 0.6 mA.
Accuracy class of megohmmeters, expressed in the form of cumulative error according to DSTU OIML R 34:2014, 2.5.
Limits of permissible values of basic errors:
- ± 2.5% of the length of the scale when measuring resistances;
- ± 2.5% of the upper value of the voltage measurement range;
- ± 15% of the measured resistance (relative error).
Limit values of insulation resistance measurement errors, expressed in the form of reduced to the length of the scale and in the form of relative equivalents.
Limits of permissible values of relative error when measuring resistances are normalized for the working part of the scale marked with dots.
For megohmmeters of modification ЭС0210/3, ЭС0210/3-Г when measuring resistances in the measuring range (500 – 100000) MΩ (scale IIx10), the measurement error is normalized only at a voltage of 2500 V.
The time of establishing impressions is no more than 15 s. The charge time of the capacity of the object, the value of which is no more than 0.5 µF, does not exceed 15 s. The discharge time of the capacity of a similar object to a safe voltage (no more than 42 V), which was charged to a voltage of 2500 V, does not exceed 4 s.
Working conditions of application:
– ambient air temperature from minus 30 ºС to plus 50 ºС;
– relative air humidity up to 90% at a temperature of 30 ºС.
The operating mode is intermittent. Measurement – 1 min, pause – 2 min.
Megaohmmeters of the ЭС0210/х type are powered from an alternating current network with a voltage of (220 V) and a frequency of (50 ± 0.5) Hz, (60 ± 0.5) Hz.
Megaohmmeters of type ЭС0210/х-Г are powered by an electromechanical generator, which is structurally placed in the housing of megaohmmeters. The speed of rotation of the handle of the electromechanical generator (120 – 144) r/min.
Overall dimensions of megohmmeters:
- megohmmeters type ЭС0210/х – 120 mm x 141 mm x 201 mm;
- megaohmmeters type ЭС0210/х-Г – 155 mm x 141 mm x 201 mm;
- bags – 210 mm x 150 mm x 230 mm.
The mass of the megohmmeter without a set of cords is no more than 1.9 kg.
The mass of the megohmmeter with a set of cords and a bag is no more than 2.8 kg.
