Keithley 6521, Инструкция по эксплуатации, Страница: 24 / 65

Card Connections and Installation
2-4
2.3.6 Guarded operation
The Model 6522 supports guarded voltage measurements.
(The Model 6517 cannot be operated in the guarded mode
when the Model 6521 is installed.) When using guarding, the
inner shield routes the guard signal, while the outer shield re-
mains at chassis ground. Thus, signal LO must be routed us-
ing a path external to the scanner card. Figure 2-9 shows
typical guarded connections.
In order to use guarding, the Model 6517 Electrometer must
be placed in the guarded mode. Refer to the Model 6517 Us-
er’s Manual for more details on guarded operation.
2.4 Card installation and removal
This paragraph explains how to install and remove the Model
6521/22 card assembly from the Model 6517 Electrometer.
WARNING
Installation or removal of the Model
6521/22 should be performed only by
qualified service personnel. Failure to
recognize and observe standard safety
precautions could result in personal in-
jury or death.
CAUTION
To prevent contamination to the scan-
ner card that could degrade perfor-
mance, handle the card assembly only
by the card edges and covers.
Figure 2-7
Typical ohms function connections
To
6517
Input
Jack
Resistors (10)
H
Out L
G
H
L IN 2....9
H
L
1
10
Triax
Input
Cables
G
G
Model 6522
Note: Set Model 6517 for
internal voltage
source connection.
To V-Source HI
on 6517
Caution: Set voltage source
limit to 200V.
Figure 2-8
Typical coulombs function connections
To 6517
Input jack
Charge
Sources (10)
H
Out L
G
IN 2....9
1
10
Coax
Input
Cables
Model 6521