1657: Difference between revisions
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(Created page with "The '''General Radio 1657 Digibridge''' is a digital RLC meter, introduced in 1976 [https://www.ietlabs.com/genrad_history/genrad_museum <sup>1</sup>]. ==Specifications== ''please add'' ==Manuals== * GenRad 1657 Manual 1657-0120-A (1978) * [https://www.ietlabs.com/pdf/Manuals/1657_im.pdf GenRad 1657 Manual] @ IET Labs ==Links== * Henry P. Hall * [https://patents.google.com/patent/US4342089A/en US Pa...") |
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The '''General Radio 1657 Digibridge''' is a digital RLC meter, [[introduced in 1976]] [https://www.ietlabs.com/genrad_history/genrad_museum <sup>1</sup>]. | The '''General Radio 1657 Digibridge''' is a digital RLC meter, [[introduced in 1976]] [https://www.ietlabs.com/genrad_history/genrad_museum <sup>1</sup>]. | ||
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==Photos== | ==Photos== | ||
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1657 1.jpg | |||
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[[Category:Impedance measurement]] | [[Category:Impedance measurement]] | ||
Revision as of 07:49, 18 December 2023
The General Radio 1657 Digibridge is a digital RLC meter, introduced in 1976 1.
Specifications
please add
Manuals
Links
- Henry P. Hall
- US Patent 4342089, Henry P Hall, Method of and apparatus for automatic measurement of circuit parameters with microprocessor calculation techniques. Filed Dec 12, 1979; Granted July 27, 1982
- How to measure R, C, L using vintage LCR meter @ YouTube
Internals
The 1657 applies a sine wave to the measured device and a precision resistor in series. The average voltage across each is measured using four different phases relative to the input sine wave, for a total of eight measurements. From these, the resistive and reactive components of the tested device can be calculated and displayed.
The 1657 uses a 6503 CPU, which is a 28-pin version of the 6502 with the same instruction set, but fewer address lines. The 1657's firmware is contained in a 2Kx8 ROM, in later versions a 2716 EPROM. A 128-byte SRAM holds scratchpad and the stack.
