Keithley 2430

4-8 Troubleshooting
by the resistor-capacitor ladder circuits shown. High-current drive capability is provided by
Q500-Q511. Coarse current limits are built into the output stage.
O
+
-
F
F
Q518
Maindrive
300K
Q521
Q523
Q525
Q507
-42V
-85V
HI Drive
Q503
F
+85V
Q504
Q514
+42V
HI Drive
Q500
Q516
+15Vf
-15Vf
Figure 4-4
Output stage simplified
schematic