Sable car GAZ-2752, 2217, 2310>> Electric equipment>> Check of electric chains>> Check of the disconnected chains

Check of the disconnected chains


Before work we calibrate an ohmmeter. On the chosen limit of measurements (for the majority of chains to 200 Ohm) we close tips щупов. On the analog device a regulator of installation "0" we expose an arrow on zero division. In household digital appliances of such regulator is not present. Therefore before measurement of small sizes (to 1–2 Ohm), having short-circuited щупы, we define internal resistance of an ohmmeter and its wires, making 0,03–0,06 Ohm. This size needs to be subtracted from instrument readings at measurement of resistance of a chain.
For check of a chain one its end (differently the current will go to round on other sites of the scheme and the indication will be incorrect) is disconnected at least. Of щупов it is better to put on a clip of the crocodile type one and to connect it to "weight". At device check with unilateral conductivity (for example, the vypryamitelny block of the generator) consider polarity of the device.
For check of windings of a starter, the generator, high-voltage wires, etc. we switch the device to the bottom limit of measurements. In practice of accuracy of usual autotesters does not suffice for check of sites of a chain where the slightest increase in resistance, for example, because of bad contact is inadmissible even. Therefore we pay attention to insignificant deviations of an arrow from zero division, and after measurement once again we check tester calibration.
Winding short circuit on "case" and mezhvitkovy short circuit we check megommetry (the "M" range). Many testers (strelochny) at work in this range need an additional source of a direct current. At absence мегомметра, being careful, we check a chain a lamp fed by a voltage of 220 V.