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Preamble DA1855: Difference between revisions
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The '''Preamble (LeCroy) DA1855''' is a 100 MHz differential amplifier functionally similar to the [[7A13|Tektronix 7A13]]. The DA1855 is a stand-alone instrument, has more common mode dynamic range and more bandwidth filters than the 7A13. The DA1855 circuitry has no resemblance to the 7A13. | The '''Preamble (LeCroy) DA1855''' is a 100 MHz differential amplifier functionally similar to the [[7A13|Tektronix 7A13]]. The DA1855 is a stand-alone instrument, has more common mode dynamic range and more bandwidth filters than the 7A13. The DA1855 circuitry has no resemblance to the 7A13. | ||
The 1855 and 1855A are essentially identical except: | |||
# The 1855 oven is on so long as the 1855 is plugged in. The 1855A oven is on only when the power switch is on. | |||
# The 1855 logic is discrete. The 1855A logic is microprocessor controlled. The logic board is self-contained and separate from the analog circuit board. The logic board is compatible or nearly compatible with both the 1855 and 1855A. | |||
# The LeCroy DA1855A is thought to be the same as the Preamble 1855A except for the front panel, the plug and circuitry for connection to LeCroy scopes and any possible mods or substitutions LeCroy may have made to facilitate manufacturing. | |||
The principal designer was [[John Addis]], who contributed the following background: | The principal designer was [[John Addis]], who contributed the following background: | ||
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==Links== | ==Links== | ||
* [[Talk:NT-7000]] | * [[Talk:NT-7000]] | ||
==Pictures== | |||
<gallery> | |||
Preamble 1855 Attenuator Adjustment Locations.jpg|Preamble 1855 Attenuator Adjustment Locations | |||
Preamble 1855a block diagram.png|Preamble 1855A Block Diagram | |||
Preamble_18XX_Logic_Board_p09_01.png|Preamble 18xx Logic Board Schematic | |||
Preamble 1855 stage 1.png|Preamble 1855 Stage 1 Schematic | |||
Preamble 1855 output amp and bwl schematic.png|Preamble 1855 Output Amp / BWL Filters Schematic | |||
Preamble 1855 current sources.png|Preamble 1855 Current Sources | |||
Preamble 1855 vdiff amp and relays.png|Preamble 1855 VDiff Amp / Relays | |||
</gallery> | |||
[[Category:Third-party products]] | [[Category:Third-party products]] | ||