HT instruments VEGA78 - Manual (Page 41)

VEGA78
EN - 39
5.3.1.4. Setting VT ratio
The meter can be interfaced also with step-down transformers in the equipment under test.
It can display the value of he voltages present on the primary winding of these
transformers. To do this it will be necessary to set the value of the transformers’ windings
ratio.
1. Move the cursor using arrows keys on field relative to “VT Ratio” , marked it with blue
background.
2. Use F3 or F4 keys (alternatively touch MOD(+) o MOD(-)) for selection of desired value
from 1 to 3000. Leave the default value “1” if no voltage transformer is present on
installation.
3. Press SAVE or ENTER keys (or the smart icon ) to save the selected option and
confirm by “Ok”. This selected parameter will be present also after turning off the meter.
4. Press ESC key (or the smart icon ) to to quit without saving any modification.
5.3.2. Advanced Settings screen
By pressing F2 key (or touch the “ADVANCED” at display) in any screen of “Analyzer
Configuration” section, below screen is shown by meter:
12/09/2006 – 16:55:10
ADVANCED SETTINGS
Zoom graphics MANUAL
Harm. type ALL
Harm. values ABSOLUTE
Zoom 1st harm YES
Average values NO
MOD(+) MOD(-)
Fig. 84: Advanced Settings screen
In the above screen is possible to select advanced options which have effect in Real Time
values screens of meter.
5.3.2.1. Zoom graphics option
This option permits to select a customized full scale on each phase of voltage and current
waveforms (see Fig. 47, Fig. 49, Fig. 51) in order to better the resolution of readings.
1. Move the cursor using arrows keys on field relative to “Zoom graphics”, marked with
blue background.
2. Use F3 or F4 keys (alternatively touch MOD(+) o MOD(-)) to select one of below
options:
 MANUAL: define a customized full scale for waveforms’ visualization choosing
among the available values. A value included from 2.0A to 5000kA it’s set for
current and included from 2.0V to 2000kV it’s set for voltage.
 AUTO: the full scale values are automatically modified by the meter.
3. Press SAVE or ENTER keys (or the smart icon ) to save the selected option and
confirm by “Ok”. This selected parameter will be present also the turn off of meter.
4. Press ESC key (or the smart icon ) to quit without saving any modification.