Level and frequency measuring recorder

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal,
• wherein said rotary measuring means comprises a rotary measuring instrument and third amplifier means for driving said rotary measuring instrument;
• wherein movement of said measuring instrument induces a counter emf in said third amplifier means;
• and
• wherein said measuring means further comprises means for feeding back at least part of said counter emf to an input stage of said third amplifier means to constitute a feedback voltage.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal,
• wherein said control means includes a substantially linear rotary potentiometer having a wiper arm and means for coupling the wiper arm to the transport means for movement therewith;
• wherein said input signal generating means includes a voltage controlled audio-frequency generator and wherein said frequency control signal is a frequency control voltage, said potentiometer having a logarithmic variation of resistance and an angle of rotation of 360.degree.;
• and amplifier means connected to said linear rotary potentiometer for furnishing a frequency control signal varying as an exponential function of said position signal to said audio-frequency generator.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal,
• wherein said input signal generator means includes audio-frequency generator means;
• wherein said control means includes a rotary potentiometer having a wiper arm and means for coupling the wiper arm to the transport means for movement therewith, said potentiometer of said control means having a logarithmic variation of resistance and an angle of rotation of 360.degree.;
• wherein said rotary potentiometer has an idle angle;
• and wherein said audio-frequency generator means furnishes a reference frequency signal when said wiper arm of said rotary potentiometer is in said idle angle.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to sid input signal generating means to constitute said frequency control signal,
• wherein said input signal generator means includes audio-frequency generator means;
• wherein said control means includes a rotary potentiometer having a wiper arm and means for coupling the wiper arm to the transport means for movement therewith, said potentiometer of said control means having a logarithmic variation of resistance and an angle of rotation of 360.degree.;
• wherein said rotary potentiometer has an idle angle;
• wherein said audio-frequency generator means furnishes a reference frequency signal when said wiper arm of said rotary potentiometer is in said idle angle;
• and wherein said reference frequency signal is a signal having a frequency of 1 kHz.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal,
• wherein said control means includes a substantially linear rotary potentiometer having a wiper arm and means for coupling the wiper arm to the transport means for movement therewith;
• wherein said input signal generating means includes a voltage controlled audio-frequency generator and wherein said frequency control signal is a frequency control voltage, said potentiometer having a logarithmic variation of resistance and an angle of variation of 360.degree.;
• amplifier means connected to said linear rotary potentiometer for furnishing a frequency control signal varying as an exponential function of said position signal to said audio-frequency generator;
• and further includes means connected to said audio-frequency generator means for wobbling said audio-frequency signal.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal, and
• wherein said movable recording means includes a recording stylus movable at a selected one of the plurality of recording speeds, said recording stylus includes an electrically heated resistance element;
• and further includes means for heating said resistance element in accordance with said selected one of said plurality of recording speeds.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal,
• wherein said control means includes a substantially linear rotary potentiometer having a wiper arm and means for coupling the wiper arm to the transport means for movement therewith;
• wherein said input signal generating means includes a voltage controlled audio-frequency generator and wherein said frequency control signal is a frequency control voltage, said potentiometer having a logarithmic variation of resistance and an angle of rotation of 360.degree.;
• amplifier means connected to said linear rotary potentiometer for furnishing a frequency control signal varying as an exponential function of said position signal to said audio-frequency generator;
• and wherein said releasable coupling means includes a function wheel coupling, said coupling having a first wheel fixedly connected to said wiper arm of said potentiometer for rotation therewith, a swinging arm supporting the first wheel, a second wheel, and spring means for pressing said second wheel against said first wheel and wherein the first wheel has a circumference carrying a frequency scale.

In apparatus for recording output signals furnished by a unit under test in response to input signals applied thereto, said apparatus having means for generating input signals having a frequency varying as a function of a frequency control signal, means for applying said input signals to said unit under test, record carrier means, transport means for transporting said record carrier means along a predetermined path and movable recording means for recording signals on said record carrier means, the improvement comprising:

• rotary measuring means connected to said movable recording means for driving said movable recording means in accordance with a drive signal applied to said rotary measuring means;
• first and second amplifier means having, respectively, a linear and a logarithmic transfer characteristic;
• selector means for selectively interconnecting one of said first and second amplifier means between said unit under test and said rotary measurement means so that the so-selected one of said amplifier means furnishes an amplified output signal constituting said drive signal;
• and
• control means coupled to said transport means for furnishing a position signal indicative of the position of said record carrier means relative to a starting position and for applying said position signal to said input signal generating means to constitute said frequency control signal,
• wherein said control means includes a substantially linear rotary potentiometer having a wiper arm and means for coupling the wiper arm to the transport means for movement therewith;
• wherein said input signal generating means includes a voltage controlled audio-frequency generator and wherein said frequency control signal is a frequency control voltage, said potentiometer having a logarithmic variation of resistance and an angle of variation of 360.degree.;
• amplifier means connected to said linear rotary potentiometer for furnishing a frequency control signal varying as an exponential function of said position signal to said audio-frequency generator;
• further includes means connected to said audio-frequency generator means for wobbling said audio-frequency signal;
• and wherein said releasable coupling means includes a function wheel coupling, said coupling having a first wheel fixedly connected to said wiper arm of said potentiometer for rotation therewith, a swinging arm supporting the first wheel, a second wheel, and spring means for pressing said second wheel against said first wheel and wherein the first wheel has a circumference carrying a frequency scale.