HT FULLTEST3, User Manual, Page: 64 / 100

FULLTEST3
EN - 62
¾ Nominal voltage selected Un = 230V
Up = 230V × 1.1 ×
—
2 = 358V Æ system voltage 230V is recognized
Up = 400V × 1.1 ×
—
2 = 620V Æ system voltage 400V is recognized
If actual mains voltage differs from nominal system voltage more than
r
10%,
the instrument scales the result to peak value of actual input voltage.
Example 1 (Un = 230V):
U
IN
= 173V (the value differs more than 10% from 230V), result is scaled to 173V ×
—
2 = 244V
Example 2 (Un = 230V):
U
IN
= 209 V (the value differs less than 10% from 230V), result is scaled to 230 V ×
1.1 × 1.41 = 358 V
6.8.2. Non-Linear mode
In non-linear mode it is assumed there are also "non-linear" or unknown components
involved in discharge process (relays, gas lamps etc.) and therefore discharge
characteristic is non-exponential or it is unpredictable (see
Fig. 56 )
Fig. 56 : Discharge supply voltage in Non-Linear mode
In this case result cannot be scaled to peak value, so it must be assured that switch
off occurs at max. input voltage i.e. at pick value otherwise measured result is not
relevant. Measured value is then registered and evaluated.
6.8.3. Trigger conditions
The instrument recognizes disconnection of mains voltage on TRIG input (INT
measurement) or on U
RES
input (PLUG measurement) when one of the following two
conditions occurs:
¾ If mean value of rectified input voltage drops down with a slope of at least 25V/s
(measured each period), then trigger is activated and the measurement starts to
run (this condition will occur for example if AC or DC input voltage starts to
decrease)
¾ Momentary value of current half period is compared with momentary value of
previous half period (the same polarity). If there is a difference
higher than 10%,
then trigger is activated and the measurement starts to run (t his condition will
occur for example if AC voltage changes to DC)
¾ The above two conditions are active on URES input in PLUG mode and on
UTRIG input in INT mode