Oscillator Leveling Head plus calibration procedure - Tektronix Type 190B

Description

Note: If you have a Tektronix Type 190B Signal Generator..you need an attenuator to run it.
The Type 190A and 190B are Constant Amplitude Generator sine wave sources that uses feedback to provide a signal whose amplitude does not vary with frequency or with the impedance of the load, within stated limits. The frequency range is 350 kHz to 50Mhz. The Amplitude measurement is made using a peak-to-peak (envelope) detector in an external attenuator head that is connected to the main unit by a special cable. The 190A uses a 6110 double diode tube for the detector. The 190B uses two 1N87A germanium diodes for the detector.
The 190 is useful for measuring the frequency response of a device whose input impedance varies with frequency. If a standard 50-Ohm signal generator is used for this purpose, the frequency-domain variations of the imput impedance of the device under test will result in frequency domain variations in the actual signal voltage that is applied to the input. This interaction between input impedance and gain measurements is often undesirable. Having a constant-amplitude source simplifies the measurement.
This 190B Attenuator is in good cosmetic condition, but is
untested
so sold
AS IS
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