Boonton 4540 Peak Power Meter Quick Start - Manual (Page 11)

4540 Power Meter
Quick Start Guide
PN: 98406000A © Copyright 2008 Boonton Page 11
Numeric Entry
There are three ways to modify the value of a selected numeric
menu item.
• Default Increment/Decrement – Pressing the ▲ or ▼ keys
will increment or decrement the parameter by a default value.
In most cases, this default is fixed. At other times, it may
depend upon the current state instrument state, such as the
display or time base settings. If the key is held, the increment/decrement will
auto repeat slowly, then at an increasing rate. The display and trace is
updated each time the value changes, so it is possible to view the effects of
changing the parameter in real time without needing to press Enter.
• Single-digit Increment/Decrement – this mode allows the parameter’s value to
be incremented or decremented by a selectable amount by highlighting the
desired digit. The mode is entered by pressing the ◄ key, which will display
a cursor under the rightmost (least significant) digit. Pressing ◄ or ► moves
the digit cursor, and pressing ▲ or ▼will increment or decrement the
highlighted digit by one. Pressing ◄ beyond the leftmost digit will add leading
zeroes to permit the number to become larger. Again, the display is updated
each time the value changes, so the changes will be visible in real time –
there is no need to press Enter each time.
• Direct Entry – The numeric keypad can be used to directly enter numbers.
Key in the desired number and press Enter to input a new value in the current
or default units. When parameters need to be entered in different units or
with unit prefixes (such as milliseconds or microseconds), entries are
completed by pressing the soft keys showing the desired units rather than the
Enter key.