Manual - 8500A Series Peak Power Meter - Giga-tronics

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Theory of Operation discussion. The output from this feedback system controls the Q1 oscillator so that the total power in RT1 is maintained at a constant level. Following the thermistor leveling circuit is a series of pin diode attenuators comprising three stages of attenuation (10 dB, 10 dB, and 20 dB) for a total capability of 40 dB. These stages are switched in and out by control signals from the GPIB/Cal Control board. In the first 10 dB stage, if the current through the attenuator is flowing in the direction required to turn on the series diode, CR2, then the attenuator is bypassed and minimum attenuation occurs. If the control current is in the other direction, CR2 is turned off and CR1 and CR4 will conduct so that 10 dB of signal will be lost. The other stages are similarly switched in and out to allow attenuation from 0 to 40 dB in 10 dB stages. The output then goes to the CAL connector. R3 supplies current from the -10 to -13 V control voltage source to the emitter of Q1, and R1 and R2 are bias resistors to provide a -10 V bias to the base of Q1. Manual No. 20790, Rev C, November 1998 4-29 Superceded by Revision D, March 2009
Series 8500A Peak Power Meters 4-30 Manual No. 20790, Rev C, November 1998 Superceded by Revision D, March 2009
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Manual Part Number: 20790 Revision
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Errata Sheet for Series 8500A Peak
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Manual - 8500A Series Peak Power Meter - Giga-tronics

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