HT instruments SPEED418 - Manual (Page 39)

400 Series
EN - 38
Formula used for calculating the prospective short circuit current:
PN
N
CC
Z
U
I

where: Z
PN
is the measured phase-to-neutral impedance
U
N
is the nominal phase-to-neutral voltage
U
N
= 127V if V
P-N meas
≤ 150V
U
N
= 230V or U
N
= 240V (§ 5.2.3) if V
P-N meas
> 150V
8.
9.
The results displayed can be saved by pressing the SAVE key twice or the
SAVE
key and, subsequently, the ENTER key (§ 9.1)
6.5.2. P-P
mode
6.
Press the GO/STOP key on the instrument or the START key on remote
probe. The instrument will start the measurement.
CAUTION
If message “Measuring…” appears on the display, the instrument is
performing measurement. During this whole stage, do not disconnect the
test leads of the instrument from the mains.
7. Once test is completed, if the
measured impedance value
is lower than the full scale,
the instrument gives a
double acoustic signal and
then displays a screen
similar to the one reported
here to the side
L O O P
0.57

7 0 1 A
FRQ=50.0Hz
VP-P=402V
VP-Pe=230V
Measured impedance value
Prospective short circuit current
P-P and P-PE measured voltages
P-P STD
Func Mod.
Formula used for calculating the prospective short circuit current:
PP
N
CC
Z
U
I

where: Z
PP
is the measured phase-to-phase impedance
U
N
is the nominal phase-to-phase voltage
U
N
= 127V if V
P-P meas
≤ 150V
U
N
= 230V or U
N
= 240V (§ 5.2.3) if 150V < V
P-P meas
≤ 265V
U
N
= 400V or U
N
= 415V (§ 5.2.3) if V
P-P meas
> 265V
8.
9.
The results displayed can be saved by pressing the SAVE key twice or the
SAVE
key and, subsequently, the ENTER key (§ 9.1)