Měřící Energetické Aparáty
10
e user software evaluates maximums for selected recording intervals on the individual
phases and also for the whole outlet for the recording interval and 1/4hr maximums.
Besides, daily diagrams of average currents are determined for any selected day.
e basic version of the instrument MEg40
+
has a bidirectional serial communication
USB 2.0. When measurement is stopped and the communication speed increases
to 256 kbit/sec, the 4 MB data memory is read within 7 minutes. Measured data are
transmitted from the 16 MB memory card to PC using a memory card reader within
4 minutes. For remote communication, optional communication RS232 or RS485 is
available. e communication interface USB 2.0 can be converted to the interface RS485
additionally using the USBhost /RS485 converter.
e function of the user program MEg40
+
is described in a separate user manual.
4/ DESCRIPTION OF CONTROLS AND DISPLAY
e front panel of the instrument MEg40
+
includes a large-area graphic backlit display
with 64 × 128 pixels and four environment-resistant foil keys with mechanical response.
e function of the keys is preset by the control program of the instrument. ere is also
a connector of the serial interface USB 2.0 and a covered two-row connector of the 16 MB
memory card. e serial number of the instrument and prescribed data are specied on
the front panel.
e rear panel includes vents, two rows of terminal blocks with marked individual
terminals, rated current and rated voltage data and safety information.
After the supply voltage is applied and the HW function of the instrument is successfully
checked, basic data about the control program appear on the display temporarily. en
according to the settings made before the power supply was interrupted, rotating energy
registers of the function Energy meter or selected measured values of the function
Monitor are displayed. e display returns to the preset mode always automatically when
no of the instrument buttons is activated for 1 minute
e universal energy meter MEg40
+
is set by the manufacturer so that after the power is
on, values of all energies of all of six registers for the whole outlet can rotate gradually on
the display from E
P+
to E
QC/P-
. e energy values appear on the display in the format with
eight digits before the decimal point and three smaller decimal digits after the decimal
point. e type and unit of the measured energy is given above the energy value, and the
energy code is displayed under the energy value according to OBIS standard. To stop the
rotation of register values, use the left outside button Stop. You can browse through the
registers manually using the other two buttons with up and down arrows (↑ ↓). After
the required register is found, the value of the selected register appears on the display for
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