Fluke 271 Manuel D’Utilisation

 

 

Symmetry adjustments work in much the same way as dc 
offset adjustments. However, because of the lengthy 
calculations which the instrument makes following a 
change to the symmetry setting, you may find it easier to 
use direct numeric entry rather than the rotary control. 

Again, the symmetry of the output is displayed in brackets 
at the right of the programmed value and in certain 
circumstances the programmed and actual values may 
differ. For example, at high output frequencies the 
specification limits for symmetry are 20 to 80 % for a 
square wave but 1 to 99 % for a sine wave. Full details are 
given in the Specifications section in chapter 1 of the 
Users Manual.

 

 

The AUX OUT socket supplies a TTL and CMOS-
compatible (0/+4 V) reference signal against which you 
can adjust the phase of the signal at the MAIN OUT 
socket. 

Return to the factory default settings by pressing 
RECALL

, 0, ENTER, then press the EDIT key followed by 

. 

The lamp next to the TRIG key will flash and you should 
see a screen like this: 
 

 
The instrument is still operating in continuous, not 
triggered mode, so the settings for the trigger source, the 
internal trigger generator and the burst count are not 
relevant here. The only item on this menu which affects 
continuous modes as well as triggered and gated modes 
is the PHASE setting. 

Move the cursor to the last digit of the phase numeric 
value field and use the rotary control to move the phase of 
the AUX OUT relative to that of the MAIN OUT. 
 

 
You may want to trigger the oscilloscope from the 

  

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