Bug #274

K2 : ERROR 401.1 - Signal switching; zero cal switch

Added by tin about 7 years ago. Updated over 4 years ago.

Status:ClosedStart date:19/07/2012
Priority:NormalDue date:
Assignee:tin% Done:


Target version:Keithley 2001 #2


Cannot measure 0V ±0.001V at A/D IN.

Common is routed to the ACF line through U526 (SHORT pulled low). ACF is then
routed through multiplexer U511. The output of the multiplexer (OUT) follows the
same path to the A/D buffer (U322) as the 400 series tests. U322 is conÞgured for x1
gain. Measure 0V at A/D IN.

Suspected components:


U322 - same as 400 tests - x1 gain


#1 Updated by tin about 7 years ago

  • Status changed from New to Resolved

Fixed by Q330 and Q512 replacement

#2 Updated by tin over 4 years ago

  • Status changed from Resolved to Closed

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