Siemens SIMEAS Q80 7KG8080 Operating Instruction page 118

10.4 Hardware structure
10.4.1 Inputs (analog)
The system consists of two analog input boards, of which there are two basic models. One model can directly
measure any voltages up to 1 kV
input range specs, see
Each input signal has its own amplifier and separate analog-digital converter. The data are only consolidated after
having been digitized. A signal processor, which is able to perform preliminary processing, serves as the link between
the data bus and the board.
The AD- converters work with 16-bit resolution. The high-voltage inputs are connected to the internal circuitry by
isolator amplifiers.
10.4.2 Data bus
The digitized measured data from the voltage and current sensors are carried to the central unit on the data bus. The
data are retrieved cyclically.
10.4.3 Central unit
In the central unit, the measured data coming from the data bus are collected, processed and stored or transferred to
the PC.
The central unit consists of signal processors (DSP) each entrusted with specific tasks, a data-RAM and a logic unit
that regulates the data flow and the activity among the signal processors. A separate micro processor is not
necessary for this purpose.
The individual DSP's have the following functions: trigger calculation, data capture, control of the device hard drive,
online calculations with intermediate and final results.
10.4.4 Interface
The interface module receives the data from the central unit and passes them on to the network.
10.4.5 The internal disk
10.4.5.1 File system and formatting
Before using a storage medium, it must be partitioned and formatted to Fat32. When doing so, observe the following:
· At this time, there are no known limitations to the available storage medium volume.
· The maximum file size is 2 GB. In cases of larger data volumes per signal, use the interval storage.
Formatting of the storage media can be accomplished with the help of the menu item Format in the Windows
Explorer (to do this, select the drive and click the right mouse button over it).
Under Windows 2000 / XP / Vista, the option File system "FAT32" or "FAT" (for "FAT16") can be selected. The file
system "FAT16" must only be used for media having less than 32 MB.
and the other can conveniently measure currents up to 1 A or 5 A (for exact
rms
technical specification)
67
Connections and Conditioning
.
Power Quality Recorder SIMEAS Q80 7KG8080, Operating instruction
E50417-B1074-C419-A1, Release 07.05.2010
E-41