11A32: Difference between revisions

11A32 (view source)

Revision as of 17:27, 29 December 2022

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Kurt

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 The fine steps between the deflection ranges are calibrated in 1% increments.
-The 11A32 uses the same firmware as the [[11A34]].
+The 11A32 and the [[11A34]] use exactly the same firmware.
-The display output of the channel 1 M377 amplifier (A1U310) is in parallel with the display output of the channel 2 M377 amplifier (A1U410)
+Each of the 11A32’s two channels has its own M377 amplifier.
-and the combined signal is presented to the mainframe via the plug-in interface connector.
+The display outputs of the two amplifiers are hard wired in parallel and drive the mainframe’s 50 Ω input impedance.
-The same is true of the trigger outputs of both amplifiers.
+The same is true of the trigger outputs of the two amplifiers.
-This is possible because regardless of whether the amplifier's output is enabled:
+The version of the M377 used in the 11A32 has 100 Ω output impedance so that two of them in parallel create a source impedance of 50 Ω.
-* each amplifier's output has a source impedance of 100 Ω so the two amplifiers in parallel match the 50 Ω spec of the [[11000 Series plug-in interface]].
-* each amplifier's nominal common-mode output voltage is zero
+Each M377 amplifier's nominal common-mode output voltage is zero whether enabled or not.
-* each amplifier's nominal differential output voltage is zero
+When not enabled each M377 differential output is exactly zero by design.
+This fact is used during calibration by the plugin’s firmware to determine the mainframe’s imbalance and compensate for it during normal operation.
 See the block diagram below.