Keithley 7022, Instruction Manual

Page: 37 / 107

Card Connections and Installation
4-3
CAUTION
Failure to set J201 to the Vext posi-
tion, when using external pull-up
voltages, may result in damage to the
output drivers.
A plug-in jumper for the bank allows you to select the inter-
nal +5V source or an external source. In Figure 4-2, the
banks are using the external voltage source.
The voltage source jumper is located on the connector board
as shown in Figure 4-3. Figure 4-4 shows how the plug-in
jumper is installed on J201.
Pull-up resistors
When interfacing outputs to high-impedance devices (i.e.,
logic devices), pull-up resistors are used to achieve the
appropriate logic level. These resistors are installed at the
factory.
Figure 4-2
Voltage source jumper for output channels
31
34
U203 U201 U202
J201
5V
V
ext
32
33
35
38
36
37
39
40
Figure 4-3
Component locations - connector board
Figure 4-4
Voltage source jumper installation
U203 U201 U202
J201
V
ext
5V
WARNING: USER SUPPLIED LETHAL
VOLTAGE MAY BE PRESENT ON
CONNECTORS OR P.C. BOARD
REFER TO MANUAL FOR MAXIMUM
VOLTAGE RATING OF CONNECTORS
Jumper
+5V VEXT
A. External Source Selected
Jumper
+5V VEXT
B. 5V Source Selected
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