CONTROL DESCRIPTION
The instrument front panel is divided into several control blocks. Controls within these
blocks are dedicated towards a common functional purpose. Each control block is outlined in
blue and is clearly labeled as COMMANDS, FAST CAP COMP, WHOLE CELL, and OUTPUT. A final section
contains the LCD METER, as well as the METER SELECT and POWER switches. This section will be
referred to as the METER block.
Front panel
COMMANDS block
The COMMANDS block
contains the VOLTAGE and
CURRENT HOLDING controls, the
JUNCTION ZERO controls, and a
COMMAND SELECT toggle switch
selecting internal or external
command inputs. This block
also contains several controls for
adjusting the sensitivity of input
commands, as well as controls
for the ZAP function.
Voltage and current commands
The VOLTAGE and CURRENT
HOLD controls provide independent modification of holding potential and holding current
settings within the ranges ± 200 mV and ± 1.0 nA, respectively. A MODE toggle switch in the
OUTPUT command block is used to select between voltage clamp (V
c
) or current clamp (I
c
)
modes. Placing the instrument in current or voltage clamp mode activates either the VOLTAGE
or CURRENT HOLD controls, respectively. This structure allows switching between voltage and
current clamping configurations without the need to readjust settings. VOLTAGE and CURRENT
HOLD controls are not attenuated by COMMAND SENSITIVITY settings.
Internal command, external command, and command sensitivity
The COMMAND SELECT toggle switch selects between an internally generated (internal
command) or an externally generated (external command) command that is applied to the
COMMAND IN BNC located on the instrument rear panel.
NOTE: When set to external command, the COMMAND SENSITIVITY controls attenuate the signal
applied to the COMMAND IN BNC located on the instrument rear panel. When set to internal
command, the COMMAND SENSITIVITY controls select the scaling of the internally generated
TEST PULSE.
The COMMAND SENSITIVITY controls are comprised of an on/off toggle and a sensitivity
selector. The SENSITIVITY SELECTOR attenuates either the internally generated TEST PULSE or
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