Ammeter `` M-104 ''.
Instruments for adjusting and controlling the PTA.Since the beginning of 1954, the ammeter "M-104" has been produced by the Leningrad plant "Vibrator". The ammeter of the "M104" type is a portable laboratory multi-range device of a magnetoelectric system with a direct reading, designed to measure current strength in DC circuits. The ammeter was manufactured for the following measurement ranges: 0.015 - 0.03 - 0.075 - 0.15 - 0.3 - 0.75 - 1.5 - 3 - 7.5 - 15 - 30 amperes. According to the accuracy class, the devices were divided into M104 (class 0.5) and M104 / 1 (class 0.2). The error caused by temperature deviation from normal does not exceed +/- 0.2% of the upper measurement limit for every 10 degrees. Change in instrument readings under the influence of an external magnetic field with an intensity of 5 Oe not more than +/- 0.5% of the upper measurement limit. Voltage drop across the measurement range (the table is duplicated on the scale): 0.015 - 0.03 - 0.075 - 0.15 A - 32 - 47 mV, 0.3 - 0.75 - 1.5 - 3 A 48 - 65 mV, 7 , 5 - 15 - 30 A, 87 - 175 mV (typical values on specific series of devices may differ in the lower direction) Insulation test voltage between live parts and the case - 2 kV. Overall dimensions 200x300x120 mm. The weight of the device is 4.5 kg, the weight of the device with the case is 6.1 kg. The M104 type device is housed in a carbolite dustproof casing. The measuring mechanism consists of a movable frame and a magnetic system. The magnet assembly consists of two parallelepiped-shaped permanent magnets cast from a nickel-aluminum alloy. To adjust the current consumption, the mechanism is equipped with two magnetic shunts. The scale of the device is mirrored, divided into 150 divisions, 140 mm long. Glass arrow. Calming the device (2 sec) electromagnetic. The devices were supplied with cases, which were a calico suitcase with a carrying handle and locks, pasted over with red velvet. Includes case. The price of the M-104 is 1225 rubles for 1954.