SA4104A / SA4104B
Reverse Energy Flow Indication
The SA4104A/B assesses the phase difference between the
voltage channel signal and the current channel signal. If this
phase difference is greater than 90 degrees then the DIRO
signal will become active. This facility is designed to detect
the wrongful connection of the meter. This operation is fully
described in the Output Signals section.
meter. This reading is independent of time and will be
repeatable so as to consistently achieve the required
accuracy for the full input current range that needs to be
measured to IEC62053 accuracy. In Figure 6 the reference
meter pulses are counted between two pulses of the meter
under test. The meter under test is then adjusted so as to
reflect the expected number of counted reference meter
pulses. A worst-case scenario is for measurements obtained
for only two pulses of the meter under test and N pulses from
the reference meter. In this case the measurement resolution
will be:
Starting Current
The SA4104A/B generates pulses on the LED and
MON/MOP outputs for an input power greater than 0.01% or
0.004% of FMAX depending on whether version A or version B
of the device is used. This is to comply with the IEC
requirement where the meter is required to generate pulses
for currents greater than 0.4%Ib.
1
(
)
ꢇ푒푎푠푢푟푒푚푒푛푡 ꢈ푒푠표푙푢푡ꢀ표푛 % = × 100
푁
The corresponding calibration and repeatability results can
never be more accurate than this measurement resolution.
Calibration and Repeatability
The SA4104A/B provides an output (LED) that is used for
calibration of the meter. The meter is calibrated by comparing
the energy reading of the meter under test with the energy
reading of the reference meter. The reference meter should
have a considerably higher pulse rate than the meter under
test. The accuracy to which the meter has to be calibrated will
dictate how much higher the reference meter pulse rate has
to be. The SA4104A/B can be calibrated to specification with
a minimum of two pulses on the LED output whilst in
STANDARD mode and utilizing an appropriate reference
Power-On Reset
The SA4104A/B has a power-on reset circuitry that activates
whenever the voltage between VDD and VSS is less than
3.6V ± 8%.
Power Consumption
The power consumption of the SA4104A/B integrated circuit
is less than 30mW.
N pulses
……….
……….
Voltage
Neutral
Single
Phase
Test
VIN
N
VIN
N
Meter Under
Test
SA4104A/B
Reference
Meter
Source
Pulse Out
IOUT
LED
IIN
IIN
IOUT
Current
Figure 6: Calibration and repeatability setup
SPEC-1654 (REV. 4)
29-09-2017
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SAMES [ SAMES ]
