Keithley 6517 Service Manual page 87

Troubleshooting
Table 5-5
Analog board checks (cont.)
Step Item/component
40 2V ANALOG OUTPUT
41 Front panel controls
42 INPUT jack
43 PREAMP OUT
44 U215 pin 6
45 2V ANALOG OUTPUT
46 Front panel controls
47 U308 pin 4
48 V SOURCE HI
49 Front panel controls
50 U308 pin 4
51 V SOURCE HI
52 Q311 drain
53 CR302 cathode
54 VR311 anode
55 CR308 cathode
5-14
Required condition
+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
Remarks
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.