BNC 6040 - Manual (Page 24)

24
OPERATING INFORMATION
Numeric Data Entry
To enter an entirely new value, simply type in the desired value using the digit, decimal point, sign
(where appropriate), and exponent keys, and then use either the EXEC (execute) or ENTER key to
terminate the data entry. During the entry of values any errors can be corrected using the BK SPC
(backspace) key. If the user decides midstream not to modify the parameter, pressing any menu key
will nullify the data entry. If the menu key is the one associated with the given parameter, the parameter
will be redisplayed with its previous value.
EXAMPLE: To set the repetition rate to 1 kHz, the following sequence is possible:
1) Assert TRIG and the display reads:
<Ext Drv: 1.00 V >
This means that the last sequencing of the TRIG key selected for External Drive (available with
certain modules).
2) Assert TRIG again and the display reads:
<Trg Int: 900.0 Hz>
We have now sequenced the TRIG menu to the Internal Trigger section and are ready to modify
the parameter.
3) Any of the following will achieve the goal:
1000 {ENTER}
1.00 {l0
x } 3 {EXEC}
2 {BK SPC} 0.1 {10*} 4 {ENTER} (here we used the backspace key)
The display will now read:
<Trg Int: 1.000 kHz>
The method for other parameters is the same as above. The decimal point {.} and exponent
{l0
x } keys, however, are not recognized for parameters such as bus address. Also, for parameters that
are not signed, the {+/-} key is not recognized.
Note that when used to change Delay or Width parameters, the ENTER and EXEC key differ slightly.
EXEC terminates the current timing cycle and will turn off a pulse if one is in progress. ENTER allows
the current timing cycle to complete but prevents the keyboard from responding to new input until the
timing cycle has finished.
If a value is entered that is outside the range of acceptable values, the display will momentarily display
"Range Error," after which the original value is redisplayed.