Fema C Series, User Manual, Page: 6 / 32

FEMA ELECTRÓNICA . Series C . C40-D
6
1.10 Measuring AC voltages and AC currents
• AC signal ranges
The instrument accepts the measure of AC voltages and
currents, with ranges from 60 mVac up to 600 Vac, cov -
ering from shunt signals to typical power line voltages
of 48 Vac, 115 Vac, 230 Vac and even 380 Vac. Both
phase - to - neutral and phase - to - phase measures are accepted.
AC currents signals up to 5 Aac are accepted, and it has a range of
20 mAac.
• ‘True RMS’ measure
AC measure are TrueRMS. The instrument assigns a ‘dead band’
around 0, with a configurable value between 0 and 100. Value is em -
pirical, and by default is set to 20. The ‘dead band’ can be configured
at the ‘Configuration menu’
(see section 1.29.7).
• Scaling
The instrument allows to scale the reading to 4 digits (9999 / -1999)
with configurable decimal point to any position. The ‘ second scaling ’
function can also be used (see section 1.25).
• Maximum oversignal
‘Maximum oversignal’ is the maximum signal accepted by the in -
strument. Higher signal values may cause instrument damage. Low -
er values are non destructive but may be out of accuracy specifica -
tions.
• Response times
The response time to a signal step is 300 mSeconds, independent of
the signal range selected.
• Terminal 5 ‘multifunction’ - External control
Terminal 5 remains configured as ‘EK’ external control function. See
section
1.9
for a list of available functions.
• Start-up, connections and jumpers
For instrument start-up follow the steps listed at section 1.7 . Signal
connections are indicated at section 1.5. Location for internal jump -
ers is indicated at section 1.9.
Vac ranges
(Veff.)
Scale
by default
Scalable Jumper ‘S’
(see section 1.9)
Jumper ‘T’
(see section 1.9)
Accuracy
(% FS)
Max.
oversignal
Connection
(
terminals)
Z
in
~
600 Vac* 600
from 9999
to -1999
G I
4-5
<0.30 %
(up to 150 Hz)
800 Vac
1(
~
) 4(
~
)
12 M
~
200 Vac 200.0 I 800 Vac 12 M
~
20 Vac 20.00 A I 150 Vac
2(
~
) 4(
~
)
1 M
~
2 Vac 2.000 B I 100 Vac 100 K
~
200 mVac 200.0 C I 30 Vac 10 K
~
60 mVac 60.0 E I 3 Vac 1 M
Table 4 - Measuring ranges in Vac. *See section
1.34
for category of measure.
Aac ranges
(Veff.)
Scale
by default
Scalable Jumper ‘S’
(see section 1.9)
Jumper ‘T’
(see section 1.9)
Accuracy
(% FS)
Max. oversig-
nal
Connection
(
terminals)
Z
in
~
5 Aac 5.00
from 9999
to -1999
I
4-5
<0.50 %
(up to 150 Hz)
7 Aac
(max. 7 sec.)
3(
~
) 4(
~
) 20 mOhm
~
20 mAac 20.00 D I 25 mAac 2(
~
) 4(
~
) 4.7 R
Table 5 - Measuring ranges in Aac
Applications
... with shunts ...
measure of AC currents through a cur-
rent shunt of 60 mV, 100 mV or 150 mV
and scaled reading
... with X/5, X/1 current
transformers ...
measure of AC currents through a X/5
or X/1 current transformer and scaled
reading
... direct measure ... direct measure of currents up to 5 Aac
... with power line voltages ...
measure of voltages over power lines
phase and neutral, of 230 Vac, 115 Vac,
...
... with power voltages ... measure of phase to phase lines on
power lines 380 Vac, 230 Vac, ...
... with AC voltages
measure of AC voltages in panels using
24 Vac, 48 Vac, ...
Table 6 - Applications with measure of AC signals
See below a list of typical connections :
~
5 Aac
~
5 Aac
1 2 3 4 5
~
600 Vac
~
600 Vac
1 2 3 4 5
~
60 mVac
~
60 mVac
1 2 3 4 5
• 5 Aac • 600 Vac
• 200 Vac
• 20 Vac to 60 mVac
• 20 mAac