H&B Inkavi; Skalen-Nr. 1-3004773
The small universal measuring instrument Inkavi of Hartmann & Braun is a combined inductance and capacitance bridge, which permit to measure within 12 range inductances of approximately 1 µH to 10 H and capacities of approximately 10 pF to 100 µF and to measure the dissipation factor δ ≤ (tan 1). Also electrolytic capacitors can be measured directly. All bridge elements necessary for the measurement and the voltage supply are hosted in a handy housing. The bridge alignment for amplitude and phase will be done separately with two rotary buttons.

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].


H&B indicator amplifier for Inkavi
Inkavi indicator amplifier
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.

The input voltage supplied by the Inkavi buzzer is strengthened over a 2-step transistor amplifier. The adjustment to the Inkavi frequency takes place via co-ordinated adjustment transducers. The intensified buzzer tension is indicated by two into Gegentakt switched germanium diodes parallelly and from a direct current indicating instrument.

Amplifiers and indicating instrument are accommodated in a black pressed material housing. On top side underneath indicating instrument finds itself zero point correction screw, with which the zero position of the indicating instrument, if necessary, can be placed behind, as well as two clamping screws. They lie parallel to the amplifier entrance and make the use possible of the amplifier also with other measuring tasks. At the face is the amplifier entrance in form of a special socket.
In the soil of the housing, which is accessible still to unscrewing the base plate, the three single-cell stabbatterien [24].

Inkavi Bedienungsanleitung Orginal operating instructions (557k)

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