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  2. Noise-figure meter - Wikipedia

    en.wikipedia.org/wiki/Noise-figure_meter

    Some commercial microwave noise generators use avalanche diodes to create a large excess noise figure that can be turned off and on. The impedance of the diode is different during the two states, so an output attenuator is used. The attenuator reduces the noise source output, but it minimizes mismatch loss. (Swain & Cox 1983, p. 26).

  3. Optical attenuator - Wikipedia

    en.wikipedia.org/wiki/Optical_attenuator

    Built-in variable optical attenuators may be either manually or electrically controlled. A manual device is useful for one-time set up of a system, and is a near-equivalent to a fixed attenuator, and may be referred to as an "adjustable attenuator". In contrast, an electrically controlled attenuator can provide adaptive power optimization.

  4. HP-15C - Wikipedia

    en.wikipedia.org/wiki/HP-15C

    The calculator was released alongside the HP 12c 30th Anniversary Edition. This model is powered by two CR2032 batteries, and can easily be differentiated from the original model by the "Limited Edition" script below the company logo as well as the black text on brushed metal back label, as opposed to the white text on black of the original.

  5. Atari Calculator - Wikipedia

    en.wikipedia.org/wiki/Atari_Calculator

    Calculator: Instruction Manual (PDF). Computer Program. Atari. 1979. (Original PDF, Gzip'ed, 114 MB) "The ATARI Calculator". Atari Connection. 1 (3). Atari: 6. September 1981. Atari's Calculator manual at the Internet Archive; APX's Calculator manual version 2 at the Internet Archive; Colleen Calculator - Atari 8-bit - source code at the ...

  6. Standard Commands for Programmable Instruments - Wikipedia

    en.wikipedia.org/wiki/Standard_Commands_for...

    In the real world some low-end devices may only support a subset of these 488.2 commands, or may even accept the commands but not perform any operation. A user should check the official programmers manual for each device before assuming all of these 488.2 commands are supported.

  7. HP-34C - Wikipedia

    en.wikipedia.org/wiki/HP-34C

    The calculator was superseded, in 1982, by the HP-15C.. Although it is argued the HP-41C (introduced late 1979 and only a matter of months after the HP-34C) was a replacement for the HP-34C, they were in fact differentiated as much by price (the HP-34C being 50% that of the HP-41C) as by functionality and performance (the HP-41C being the first HP LCD-based and module-expandable calculator ...

  8. HP-42S - Wikipedia

    en.wikipedia.org/wiki/HP-42S

    Perhaps the HP-42S was to be released as a replacement for the aging HP-41 series as it is designed to be compatible with all programs written for the HP-41. Since it lacked expandability, and lacked any real I/O ability, both key features of the HP-41 series, it was marketed as an HP-15C replacement.

  9. Π pad - Wikipedia

    en.wikipedia.org/wiki/Π_pad

    A Π-pad attenuator formed from two symmetrical L sections. Because of the symmetry, R 1 = R 3 in this case. For an attenuator, Z and Y are simple resistors and γ becomes the image parameter attenuation (that is, the attenuation when terminated with the image impedances) in nepers. A Π pad can be viewed as being two L sections back-to-back as ...

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