Rohde & Schwarz HM7042-5, User Manual

27

Subject to change without notice

  ELECTRONIC FUSE  

This pushbutton will activate the electronic fuse mode, 
indicated by LED [ON].

  OUTPUT

Pushbutton for turning all 3 channels simultaneously ON/
OFF, indicated by the LED [ON]. The voltage displays will 
remain unaffected. 

6.3  Current Limiting

After turn-on of the power supply it will always start in the 
CURRENT LIMIT mode. Using the CURRENT       con-
trols the maximum output current I

max

 can be set for each 

output separately. Onset of current limiting in one channel 

will  not  influence  the  others.  In  order  to  adjust  I

max

 the 

appropriate output has to be short-circuited first, then I

max

can be set, the associated LED     or   will light up and 
indicate the current limit mode.

6.4  Electronic Fuse

Prior to selection of this mode the current limits have to be 
set using the CURRENT       controls. As outlined each 

output has to be short-circuited first before adjusting the 

appropriate CURRENT control. After setting I

max

, the short 

has to be remov-ed. Then Electronic Fuse   is depressed, 
the LED [ON] will light up indicating that the HM7042-5 is 
in the Electronic Fuse mode. In this mode all outputs will 
be immediately deactivated if the I

max

 of one channel is 

reached. In order to leave this mode press Electronic Fuse 

 again. 

The current limits can be set using the controls CURRENT   

   0 – 2 A / 0 – 5 A. If a control is set CCW to 0 A indeed the 

current will be zero, so the output capacitances will be dischar-
ged slowly to 0 V. In “Current Limit“ mode the CCW position of 
a control will cause the associated LED       to light up, the 
output voltage will decrease slowly. In the Electronic Fuse mode 
the CCW position of any CURRENT control will result in immedi-
ate switching off of all channels after depressing OUPUT  . 

    O p e r a t i n g   c o n t r o l s   a n d   d i s p l a y s

O p e r a t i n g   c o n t r o l s   a n d   d i s p l a y s