1657: Difference between revisions
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{{GR Product | |||
|model=1657 | |||
|class=RLC measurement | |||
|summary=digital RLC meter | |||
|image=1657_3.jpg | |||
|caption=Genrad 1657 Digibridge | |||
|series= | |||
|introduced=1976 | |||
|discontinued=(?) | |||
|designers=Henry P. Hall | |||
|manuals= | |||
* [[Media:GenRad 1657 Manual 1657-0120-A 1657-0120-A 1978.pdf|GenRad 1657 Manual 1657-0120-A (1978)]] | |||
* [https://www.ietlabs.com/pdf/Manuals/1657_im.pdf GenRad 1657 Manual] @ IET Labs | |||
}} | |||
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>]. | ||
==Specifications== | ==Specifications== | ||
''please add'' | ''please add'' | ||
==Links== | ==Links== | ||
Revision as of 04:41, 20 February 2024
The General Radio 1657 Digibridge is a digital RLC meter, introduced in 1976 1.
Specifications
please add
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.
