Rotary Data Knob
The rotary data knob can be used to change the
value of a parameter that is open for editing. The
cursor is moved under the open parameter using
the < and > pads of the cursor control key. Then, by
slowly turning the knob clockwise or counter-clock-
wise the value of the parameter is increased or de-
creased by the unit size. The unit size is determined
by the cursor placement. Turning the knob rapidly
changes the value of the parameter in larger steps.
When editing frequency, power level, and time pa-
rameters, the incremental size can be set to a spe-
cific value using a system configuration sub-menu.
Once set and activated, each time the knob is
turned clockwise or counter-clockwise, the param-
eter’s value increases or decreases by the set
amount.
KEYPAD
The numeric keypad provides for entering fre-
quency, power level, time, and number-of-steps pa-
rameters and GPIB address values. The “–” key
functions as a “change sign” key during any keypad
entry.
CLEAR ENTRY Key
When a parameter is open for editing, the
CLEAR
ENTRY
key is used to clear the parameter entry.
BACK SPACE Key
The
BACK SPACE
key is used to correct keypad
data entry errors by deleting the last number, “–”,
or decimal point entered.
Terminator Keys
The terminator keys are used to terminate keypad
data entries and change the parameter values in
memory. If the entered value is outside the allow-
able range of the open parameter, an error message
will be displayed along with an audible “beep”. The
terminator keys are as follows:
GHz / Sec / dBm
MHz / ms / dB
kHz /
µ
s / STEPS
Hz / ns / ADRS
LOCAL (FRONT
DATA ENTRY
PANEL) OPERATION
AREA
681XXB OM
3-13
