CMU Startup of the CMU
1100.4903.12 2.5 E-9
Additional Information... Alternative Settings
and Measurements
... on Step 1
" Mains switch on the rear panel
When the mains switch at the rear is set to the O position, the
complete instrument is disconnected from the power supply.
When the mains power switch is set to the I position, the in-
strument is in standby mode or in operation, depending on
the position of the ON/STANDBY key on the front panel.
& Chapter 1
The CMU is automatically set to
the AC supply voltage and fre-
quency applied. Note the permis-
sible ranges of AC voltages and
frequencies indicated at the rear
of the instrument and in the data
sheet.
# ON/STANDBY key on the front panel
The ON/STANDBY key at the front of the instrument deter-
mines whether the instrument is in standby mode or in opera-
tion.
Standby mode:
Only the OCXO reference frequency oscillator (option CMU-
B11/B12), if installed, is supplied with operating voltage. The
orange LED (STANDBY) is illuminated.
Operation:
The green LED (ON) is illuminated and all modules of the in-
strument are supplied with operating voltage.
& Chapter 1
The behavior of the CMU when it
is switched off depends on the
Front Module controller type in-
stalled; see Chapter 1.
... on Step 2
$ Startup menu
The startup menu displays the following information:
• The startup procedure (Process)
• Instrument model, serial number and version of the CMU
base software (Info).
• Installed hardware and software options and equipment
(Options). Available software options are listed with their
version numbers.
• Progress of the startup procedure (Startup bar graph).
& Chapter 4
The Default hotkey can be used
to load the factory default settings
for all function groups. Settings
made and stored in the previous
session are overwritten.
% Wait hotkey
By default the CMU switches to the last main menu of the
previous session after terminating the startup process. This is
convenient if an interrupted session is to be resumed or if the
instrument is generally used in a definite operating mode.
On the other hand, the Wait function can be used to access
the configuration menus which can be opened by means of
the front panel keys before the actual measurement is
started.
While the Wait hotkey is active, a reset of the instrument is
not possible.
The CMU’s user interface has
been optimized with the aim of
facilitating fast and easy switch-
over between the menus and
measurement modes. This in-
cludes the general configurations
which can be accessed from any
measurement menu.
The most important selection and
configuration menus such as
Reset, Setup, Menu Select
etc.are directly accessible via
front panel keys.
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