BNC 555 Series, User Manual, Page: 15 / 47

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• Enter the RATE menu, by pressing the FUNCTION key and then the "4" key.
Set the desired pulse period. Note that in general the pulse delay plus
pulsewidth should be less than the period.
• Press the RUN key.
Selecting Menus
Parameters are grouped in menus, selectable using the function keys. To select the output
channel parameters press the letter key corresponding to the desired channel. To select blue
menus press the FUNCTION key and then the key corresponding to the desired blue function.
Menus may include a number of different pages. Each page contains up to four parameters.
The status block in the upper-left corner of the display shows a vertical arrow if the current
menu contains additional pages. To select the next page, select the same menu button again,
pressing the FUNCTION key and blue function again for higher-order menus.
Selecting Menu Items
Within a menu, the blinking cursor indicates the current menu item for editing. The NEXT key
or pressing the adjustment knob will select a different menu item.
Numeric Input Mode
When the current item is numeric, the system enters the Numeric Input Mode. In this mode
data may be edited in one of three ways. Using the arrow keypad, the Left and Right arrow
keys are used to select a digit to edit. The selected digit blinks to identify itself as the active
digit. The Up and Down arrow keys are then used to increment or decrement this digit. Alter-
nately, after using the Left and Right arrow keys to select an active digit, the adjustment knob
may be used to increment and decrement this digit. The adjustment knob features speed
dependent resolution. Slow rotation will increment or decrement the active digit by one. As
you increase the speed of rotation, the parameter will be 10 to 1000 times faster depending on
the speed.
The last entry mode is using the numeric keypad. Enter the number, including decimal point
using the numeric keypad. When complete, enter the number using the ENTER key. Errors
may be corrected using the backspace key or to start over press the clear key (CLR). Pressing
the CLR key a second time will exit the numeric keypad mode and restore the original number.
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