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Instruction sheet 721 100
12.8 3 phase networks without star point
L1
U
W
V
L2
L3
Measurement in 3 phase networks without star point.
Fig. 18:
Attention
The connections of current paths should never be inter-
rupted unless the system or the experiment is switched
off. There is a possibility of the formation of arcs in case
of disconnections and short circuits. The safety leads
used must be rated for the expected voltage and current
values.
13 Additional functions of the Power Analyser
CASSY Plus (727 110)
13.1 Isolation amplifier
At the analogue outputs U to X, the signals of the inputs A to
D or calculated signals for the connection of an oscilloscope or
other control devices with a maximum output voltage of ±10 V
are output.
The analogue outputs are permanently assigned to the mea-
suring channels, e.g., channel A to analogue output U. With
the activation of a measuring channel, they become visible as
measurand G
to G
and can then be activated like a measur-
U
X
and.
I
A
U
AC:
700 V / 16 A
DC: 1000 V / 25 A
CAT III
300 V
I
B
U
I
C
U
Tel: +49-2233-604-0 · Fax: +49-2233-604-222 · Email: info@ld-didactic.de · Technical alterations reserved
Activation of the output channels.
Fig. 19:
Measured signals
The signals U
, I
, and P
x
x
x
delivered to the output. The gain associated with the measur-
and is displayed as a measured value in the display and in the
menu selection.
The conversion is calculated as U
Display of the gain in the output menu.
Fig. 20:
Calculated signals
It is possible to add, subtract, or multiply the signals from adja-
cent channels. With these functions, the gain is displayed as a
measurand as well.
Output
+
U
+ U
,
A
B
U
I
+ I
A
B
U
+ U
,
B
C
V
I
+ I
B
C
U
+ U
,
U
C
D
W
I
+ I
C
D
U
+ U
,
D
A
X
I
+ I
D
A
Table of possible assignments.
Tab. 1:
© by LD DIDACTIC GmbH · Leyboldstraße 1 · D-50354 Hürth · www.ld-didactic.com
of the measuring channel can be
U
5.75 V
U
=
=
A
G
0.025 V/V
U
-
x
U
- U
,
U
x U
,
A
B
A
B
I
- I
I
x I
A
B
A
B
U
- U
,
U
x U
,
B
C
B
C
I
- I
I
x I
B
C
B
C
- U
,
U
x U
,
C
D
C
D
I
- I
I
x I
C
D
C
D
U
- U
,
U
x U
,
D
A
D
A
I
- I
I
x I
D
A
D
A
13 / 14
= 230 V
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