CMU  Putting the Instrument into Operation 
1100.4903.12 1.11  E-10 
Mounting in a Rack 
Using the adapter ZZA-411 (order number 1096.3283.00) the instrument can be mounted in 19" racks 
according to the mounting instructions supplied with the rack adapter. 
Note:  For convenient operation of the instrument note the following: 
!  Allow for sufficient air supply in the rack. 
! Make sure that there is sufficient space between the ventilation holes and the rack 
casing. 
 
 
 
Connecting the Instrument to the AC Supply 
 
 
 
 
Caution! 
After moisture condensation, allow the instrument to dry before switching on. 
Note the permissible ambient temperature according to the data sheet. 
Do not cover the lateral and rear ventilation holes. 
 
 
 
The CMU may be connected to one-phase AC supplies with nominal voltages ranging from 100 V to 
240 V and nominal frequencies ranging from 50 Hz to 400 Hz (see inscription on the rear panel and 
data sheet). Depending on the options installed, the power consumption ranges from 120 W to 230 W. 
 
Note:  The CMU is automatically adapted to the AC supply voltage applied. External 
switchover or adaptation of the fuses are not necessary. 
 
o
I
 
Mains 
connector
For the mains connection use the supplied mains connector.  
As the instrument is designed according to the regulations for safety class 
EN61010, it must be connected to a power outlet with earthing contact.  
 
 
Switching on the Instrument / Startup Test  
o
I
 
 
Mains 
switch 
 
The CMU can be switched on using the mains switch at the rear of the 
instrument and the ON/STANDBY key at the bottom left of the instrument 
front. 
The mains switch can be set to two positions: 
0  The 0 position implies an all-pole disconnection of the instrument 
from the mains. 
I In the I position, the instrument is in standby mode or in operation, 
depending on the position of the ON/STANDBY key at the front of 
the instrument.