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Bug #268

K2 : ERROR 105.2 - System trigger bus

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

Status:
Closed
Priority:
Normal
Assignee:
Target version:
Start date:
20/07/2012
Due date:
22/07/2012
% Done:

0%

Estimated time:

Description

Defective system trigger bus.
System trigger inputs are normally pulled up to 5V through the protection diodes and
5.1kohm resistors (CR611-CR616, R648-R650 and R655-R657). The Model 2001 can generate
a trigger on any of the six trigger bus inputs by turning on the appropriate FET
(Q602-Q607). These FETs are controlled by system trigger outputs (STO1-STO6) of the
5064 ASIC (U618).

In test 105.1, STI1 is set up as the trigger input. The trigger 1 FET (Q606) is then turned
on and off through STO1, and it is veri├×ed that this trips the trigger circuitry in the
ASIC. This test is then repeated for trigger 2 through 6 for tests 105.2 through 105.6.
Success indicates proper operation of the trigger bus.

Suspected:
ASIC, FETs, diodes and 5.1kohm resistors.

History

#1

Updated by tin over 7 years ago

  • Description updated (diff)
#2

Updated by tin over 7 years ago

  • Description updated (diff)
#3

Updated by tin over 7 years ago

  • Category set to 61
  • Target version set to Keithley 2001 #2
#4

Updated by tin over 7 years ago

  • Status changed from New to Resolved

R758 was broken by disassemble

#5

Updated by tin over 4 years ago

  • Status changed from Resolved to Closed

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