ZES ZIMMER LMG450, User Manual

Page: 52 / 306

Instrument controls LMG450
52
Figure 16: Misc. menu
Advanced tab
Here you can set-up some advanced, special things which should not be used under usual
conditions. Just users which are sure to know what they do should change values in this menu.
With wrong settings measuring results might be wrong! Following things can be set-up:
Zero The zero point rejection (see 13.2, ‘Display of values’) can be switched off. It
will be activated again each time you restart the instrument.
Phan. Vals. The rejection of phantom values can be deactivated. Phantom values appear for
example at wiring ‘3+1, U
∆
I*->U
∆
I
∆
’, because the measured star current has
physically nothing to do with the measured triangle voltage. But the power
measuring channel sees both signals at the same time and calculates a power for
them, the phantom power.
Z-Adj. allows you to adjust the zero point of the instrument. You can only adjust the
actual selected voltage and current jacks.
You can reset the instrument to the factory settings of calibration by holding the
lower two softkeys pressed while switching on the instrument (for about 10s,
until the instrument beeps).
Be careful with this function because you can also deadjust the
instrument!!!
For the exact adjustment steps please refer to 12.3.2 ‘Adjustment
The adjustment has to be done at (23
±
1)°C.
ZES ZIMMER offers in principle a way to adjust the instruments outside our factory, if some
technical preconditions are fulfilled. For further information, please contact sales@zes.com
Zero adjustment of the instrument’.