Keithley 6517 - Page 87

Troubleshooting
5-14
Table 5-5
Analog board checks (cont.)
Step Item/component Required condition Remarks
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
2V ANALOG OUTPUT
Front panel controls
INPUT jack
PREAMP OUT
U215 pin 6
2V ANALOG OUTPUT
Front panel controls
U308 pin 4
V SOURCE HI
Front panel controls
U308 pin 4
V SOURCE HI
Q311 drain
CR302 cathode
VR311 anode
CR308 cathode
+2V
Coulombs function, 20nC range, zero check off.
Apply 20nC charge.
+20V
-10V
+2V
Set voltage source to 100V, operate on.
4.88V
100V
Set voltage source to 100V, operate on.
4.81V
1000V
+1200V
+120V
-1200V
-120V
Referenced to COMMON.
Initial test conditions.
Input test charge.
Referenced to COMMON.
Referenced to COMMON.
Referenced to COMMON.
Program voltage source.
Referenced to V SOURCE LO.
Referenced to V SOURCE LO.
Program voltage source.
Referenced to V SOURCE LO.
Referenced to V SOURCE LO.
Referenced to V SOURCE LO.
Referenced to V SOURCE LO.
Referenced to V SOURCE LO.
Referenced to V SOURCE LO.