647A: Difference between revisions

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Kurt

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Revision as of 20:28, 19 March 2011 (view source) SteveS (talk \| contribs) (New page: The 647A is an improved version of the 647, with the main enhancement being doubling the bandwidth to 100 MHz. Tek also introduced three new plug-ins with the 647A. The 10A2A is an impro...)		Revision as of 04:10, 9 September 2011 (view source) Kurt (talk \| contribs) No edit summary Newer edit →
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	The 647A is an improved version of the 647, with the main enhancement being doubling the bandwidth to 100 MHz. Tek also introduced three new plug-ins with the 647A. The 10A2A is an improved version of the dual channel 10A2 vertical plug-in, with bandwidth extended to 100 MHz. The 11B2A is similar to the 11B2 dual time base, but triggers up to 100 MHz. In addition, Tek introduced the 10A1 differential amplifier. It operates down to 1 mV/div sensitivity, and includes a comparison voltage mode with a calibrated DC offset similar to that first offered in the type W plug-in. The maximum bandwidth of the 10A1 is 55 MHz for sensitivities of 5 mV/div and higher.		The 647A is an improved version of the [[647]], with the main enhancement being doubling the bandwidth to 100 MHz. Tek also introduced three new plug-ins with the 647A. The 10A2A is an improved version of the dual channel 10A2 vertical plug-in, with bandwidth extended to 100 MHz. The 11B2A is similar to the 11B2 dual time base, but triggers up to 100 MHz. In addition, Tek introduced the 10A1 differential amplifier. It operates down to 1 mV/div sensitivity, and includes a comparison voltage mode with a calibrated DC offset similar to that first offered in the type W plug-in. The maximum bandwidth of the 10A1 is 55 MHz for sensitivities of 5 mV/div and higher.

	The vertical amplifier contained in the 647A indicator unit (mainframe) consists of NPN and PNP bipolar transistors. The output transistors, Q484 and Q494, are selected 2N3866 NPN transistors. The datasheet for the 2N3866 lists Ft as 800MHz and specifies an absolute maximum value of Vceo of 30V. The quiescent value of Vce on Q484 and Q494 is about 30V. So it seems likely that the selection process for these transistors involved testing their performance at the high end of their specified voltage range, and probably beyond.		The vertical amplifier contained in the 647A indicator unit (mainframe) consists of NPN and PNP bipolar transistors. The output transistors, Q484 and Q494, are selected 2N3866 NPN transistors. The datasheet for the 2N3866 lists Ft as 800MHz and specifies an absolute maximum value of Vceo of 30V. The quiescent value of Vce on Q484 and Q494 is about 30V. So it seems likely that the selection process for these transistors involved testing their performance at the high end of their specified voltage range, and probably beyond.