Keithley 6521, Instruction Manual, Page: 22 / 65

Card Connections and Installation
2-2
Model 6521 connecting cables
Figure 2-2 shows the input/output connecting cables for the
Model 6521 card. Card connections include:
• INPUT 1-10 (channels 1-10): Each input is equipped
with a BNC coaxial cable, which is terminated with a
female BNC connector. The center conductor is HI,
while the outer shell is LO.
• OUTPUT: The triax output cable is equipped with a 3-
slot male triax connector. The center conductor is HI,
the inner ring is LO, and the outer shell is connected to
chassis ground.
2.3.2 Model 6522 scanner card configuration
Model 6522 simplified schematic
Figure 2-3 shows a simplified schematic diagram of the
Model 6522. As with the Model 6521, the Model 6522 scan-
ner card has 10 input channels and a single output. Note that
each channel utilizes single-pole switching with only the HI
signal path switched. Input connections include H (HI), L
(LO), and G (chassis ground), while output connections in-
clude H, L, and G, which is connected to chassis ground.
Model 6522 connecting cables
Figure 2-4 shows the input/output connecting cables for the
Model 6522 card. Card connections include:
• INPUT 1-10 (channels 1-10): Each input is equipped
with a triax cable terminated with a 3-lug female triax
connector. The center conductor is HI, the inner ring is
LO, and the outer shell is connected to chassis ground.
• OUTPUT: The output cable is terminated with a 3-slot
male triax connector. The center conductor is HI, the in-
ner ring is LO, and the outer shell is connected to chas-
sis ground.
Figure 2-2
Model 6521 connecting cables
BNC Input
cables
Triax output
cable
Figure 2-3
Model 6522 simplified s hematic
Triax
Output
Triax
Inputs
H
Out L
G
H
L IN 1
H
L IN 10
IN 2....9
G
G