By R. M. Marston
A guide of contemporary instrumentation and try equipment circuits, this publication provides the reader with 500 functional circuits
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Additional resources for Instrumentation and Test Gear Circuits Manual
Example text
048V at 2k0 load. = 0 . 9 1 7 V at 500R load. 14. load The output voltage of a generator impedance. 15. output The 'ideal' variable attenuator presents impedances. constant input and setting. Such attenuators do in fact exist, and are usually based on a number of switch-selected fixed-value attenuator pads. 77, together with their design formulae. Note that these attenuators are perfectly symmetrical, enabling their input and output terminals to be transposed, and that they are each designed to feed into a fixed load impedance, Z, which actually becomes part of the attenuator network.
2( Ω ) R, ( Ω ) / ? 24. pads. R2< o—£— dB Design chart for 50Ω, 75Ω, and 600Ω 'T-type This impedance shunts R3 of the preceding section and reduces its effective value to 1100Ω, so that section (the fourth) also gives +10 attenuation and an I l k input impedance. Similarly, sections 2 and 3 act in precisely the same way. 27. ^4 worked example of a five-step switched ladder attenuator, giving —20dB steps into IkO, with design formulae. shunted by the I l k input impedance of the '2' section) has an effective impedance of 2k0; this section thus has an effective attenuation of +2. With the above picture in mind, now imagine the effect of connecting the external IkO load to any one of the attenuator's output terminals.