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Inkavi
The position of the variable resistor to the amplitude alignment becomes by a shop window with double line parallax-free reading off on a scale from approx.. 210 mm of length indicated. The division of 0... 10 (10,2) is linear. The phase becomes to with tan δ and with 1 - 0.1 - 0.01 - 0.001 marked rotary button balanced. The value read off after alignment on the large scale multiplied by the factor belonging to each measuring range results in looked for inductance or capacity; the position tan δ of the button makes an estimation of the dissipation factor possible. The bridge alignment is still possible up to a dissipation factor δ tan = 1. With the attitude of the messbereichwaehlers Inkavi is switched automatically as inductance or capacitance bridge. As zero-indicator a headphone with a resistance of 2 x 200 Ω is used, whose can be switched both shells by transverse holes in the banana plugs parallel to the most favorable adjustment to the respective measuring range or one behind the other. With the measuring range 10 µF and/or. 0,01 mH is advisable the use low impedance headphone of 2 x Ω 4. For the protection of the ear a tension limiter is inserted into the branch of zero of the bridge, which avoids to large volumes. As voltage supply a 4.5 V battery (torch battery) is used, the alternating voltage sinusoidal over a chopper one produced of approximately 1200 cycles per second. Instead of the battery DC voltage can be applied also external . A push-button, which is furnished for continuous contact gift also, puts the battery to the chopper. The developing alternating voltage amounts to with condensers over 1 µF only about 1 V, so that also electrolytic capacitors can be measured [7].
The Inkavi indicator amplifier is an electronic zero-indicator particularly developed for the Inkavi. It serves the measuring bridge in connection with the Inkavi to the reinforcement and for the announcement of the alternating voltages arising in the branch of zero with imperfect alignment. As special for the Inkavi of developed resonance amplifiers with a logarithmic display it strengthens essentially the frequencies of the Iinkavi buzzer. The Inkavi indicator amplifier is not usable therefore for strengthening other frequencies (clay/tone and/or frequency). The logarithmic display makes the indicator usable for a large voltage range. Operation
Description
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