17
3.4 Display Brightness
The front panel 6-digit LED display brightness can be adjusted for opti-
mal viewing. The default value, 8, is recommended for most applications.
A setting of zero turns the display off, which may reduce noise in sensi-
tive measurements. This can only be configured through the computer
interface. Refer to Chapter 4.
Menu Navigation
Brightness: 0 to 15
Default: 8
Interface Command:
BRIGT
3.5 Output Current Setup
This section explains how to configure the output current through the
keypad. Refer to Chapter 4 for information on the computer interface
commands. The Model 121 has been optimized to drive resistive sensors
(such as Cernox and Platinum Sensors), diode sensors, and Hall genera-
tors.
3.5.1 Enable/Disable
The Model 121 allows the user to turn on or turn off the output current
by pressing
. When this key is pressed, the display will either read
“off” for the disabled state, or the display will show a numeric value for
the enabled state. The output current will always power on in the dis-
abled state. In this state the instrument will not output any current.
Menu Navigation
Output: Enabled or Disabled
Default: Disabled
Interface command:
IENBL
3.5.2 Range Change
The Model 121 allows for the user to change ranges via the
and
keys. The range can be changed to any of the 13 fixed ranges or the
user current range using these keys. The user current range can be
accessed by pressing
when in the 100 mA range. The range does not
wrap around. For example, when in the USER current range, pressing
will do nothing.
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