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Bug #274

K2 : ERROR 401.1 - Signal switching; zero cal switch

Added by tin almost 8 years ago. Updated over 5 years ago.

Status:
Closed
Priority:
Normal
Assignee:
tin
Target version:
Keithley 2001 #2
Start date:
07/19/2012
Due date:
% Done:

0%

Estimated time:

Description

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:

U526
U511
U322 - same as 400 tests - x1 gain

#1

Updated by tin almost 8 years ago

  • Status changed from New to Resolved

Fixed by Q330 and Q512 replacement

#2

Updated by tin over 5 years ago

  • Status changed from Resolved to Closed

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