HP 8163A User Manual page 32

Getting Started
A Description of the User Interface
User Interface Features
Introducing Softkeys
A softkey is a key whose function changes depending on the keys
that you have pressed before. The function of the softkey is shown
on the display to the left of the softkey.
Introducing Hardkeys
A hardkey is a key that always has the same function.
Special Module States
Besides parameter or measurement values, you may also see some
texts instead.
The slot is empty.
<empty>
The installed module is not supported by the
<unknown>
firmware revision.
Slot and Channel Numbers
Each module is identified by a slot number and a channel number.
You can use slot and channel numbers:
• to identify each channel in the overview screen with a number
at the side of the screen,
• to identify each channel in the Details screen with a tab at the
top of the screen, and
• to identify the channel when referencing the power measured
by another channel, see "How to Reference Another Power
Measurement Channel" on page 68, and
• to identify a channel when using a HP-IB command, see the
HP 8163A Lightwave Multimeter & HP 8164A Lightwave
Measurement System Programming Guide for more
information on HP-IB commands.
The slot number represents the module's position in the mainframe.
Front-loadable modules are numbered from one to two from left to
right for the HP 8163A and from one to four from left to right for
the HP 8164A. These numbers are displayed on the front panel
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