Tektronix Keithley 2260B Series - Page 137

ANALOG CONTROL
133
Note
The Ext-R configuration is recommended for
safety reasons. In the event that the cables become
accidentally disconnected, the current output will
drop to zero. Under similar circumstances using
Ext-R , an unexpected high current would be
output.
If switches are used to switch between fixed
resistances, use switches that avoid creating open
circuits. Use short-circuit or continuous resistance
switches.
Connection
2260BEXT-R
Analog
connector
8
9
Output
Terminal
2 core shielded
wire or twisted
pair
 Pin9 → EXT-R
 Pin8 → EXT-R
 Wire shield → negative (-) output terminal
Steps
1. Connect the external resistance according to the
connection diagrams above.
2. Set the F-91 (CC Control)
configuration settings to 2 for Ext-
R
or 3 for Ext-R .
Page 120
 Be sure to cycle the power after the power on
configuration has been set.
3. Press the Function key and confirm
the new configuration settings (F-
91=2 or 3).