8163A/B, 8164A/B, 8166A/B User’s Guide 39
Getting Started 1
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.
• <empty> - The slot is empty.
• <unknown> - The installed module is not supported by the 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,
• to identify the channel when referencing the power measured by
another channel, see How to Reference Another Power Measurement
Channel on page -104,
• to identify the channel when using an application, see Applications on
page -247, and
• to identify a channel when using a GPIB command, see the 8163A/B
Lightwave Multimeter, 8164A/B Lightwave Measurement System, &
8166A/B Lightwave Multichannel System Programming Guide for more
information on GPIB 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 8163A/B,
• from one to four from left to right for the 8164A/B, and
• from one to seventeen from left to right for the 8166A/B.
These numbers are displayed on the front panel beside each module slot.
The 8164A/B slot for back-loadable modules is numbered zero.
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