HT instruments VEGA78 - Manual (Page 40)

VEGA78
EN - 38
5.3.1.1. Setting system frequency
1. Move the cursor using arrows keys on field relative to “Freq[Hz]”, marked with blue
background.
2. Use F3 or F4 keys (alternatively touch MOD(+) o MOD(-)) to select the system
frequency choosing between 50Hz or 60Hz options. This parameter is relevant ONLY if
the input voltage not permits to recognize the frequency value (for example, only the
clamps for the current measurement are connected). In this case the instrument
generates an internal synchronism equal to the value of the set frequency.
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 turn off the meter.
4. Press ESC key (or the smart icon ) to quit without saving any modification.
5.3.1.2. Setting clamp type
This parameter must be always set equal to the clamp type used.
Two types of clamps are available:
 STD: For Standard clamps or Current Transformer.
 FLEX: For Flexible clamps.
1. Move the cursor using arrows keys on field relative to “Clamp Type”, marked with blue
background.
2. Use F3 or F4 keys (alternatively touch MOD(+) o MOD(-)) to select clamp type
choosing between STD or FLEX options.
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 turn off the meter.
4. Pressing ESC key (or the smart icon ) to quit without saving any modification.
5.3.1.3. Setting full scale of clamps
CAUTION
The value of this parameter must be always equal to the full scale of the
current clamps used to take the measurement. In case multi-scale clamps are
used, the value of this parameter must be equal to the scale selected on the
clamps.
1. Move the cursor using arrows keys on field relative to “Clamps FS [A]” , marked it with
blue background.
2. Use F3 or F4 keys (alternatively touch MOD(+) o MOD(-)) to select the desired full
scale
CAUTION
 In case of STD clamps any value can be set by using F3 or F4 keys
(alternatively touch MOD(+) o MOD(-)). In case of FLEX clamp only 300A or
3000A options are possible.
 In case of STD clamp measured values of current < 0.1%FS are zeroed
 In case of FLEX clamp with 300A range, measured values of current <1A
are zeroed.
 In case of FLEX clamp with 3000A range, measured values of current <5A
are zeroed.
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. Pressing ESC key (or the smart icon ) to quit without saving any modification.