ETAS ES930.1, User Manual, Page: 45 / 139

ETAS Analog Input Channels ("AI 1-4"/"AI 5-8" Connections)
ES930.1 - User Guide 45
6 Analog Input Channels ("AI 1-4"/"AI 5-8" Connec -
tions)
The ES930.1 provides four analog input channels each at the two "AI 1-4" and
"AI 5-8" connections.
6.1 Channel Groups
The analog input channels 1, 2, 3 and 4 are provided at the "AI 1-4" connection
and the analog input channels 5, 6, 7 and 8 at the "AI 5-8" connection.
6.2 Assemblies of the Analog Input Channels
6.2.1 Overview
Fig. 6 - 1 Analog input Channels "AI 1" to "AI 4"
The eight analog input channels "AI 1-4" and "AI 5-8" of the ES930.1 are identical
in design. Each channel consists of the following assemblies (see block dia
-
gram in Fig. 6 - 1 on page 45):
• Input range
• Anti-aliasing filter
• A/D converter
• FIR filter
The functionality of all analog input channels can be configured separately.
6.2.2 Input Range (Level Adjustment)
In each analog input channel, a capacitively compensated voltage divider limits
the level of the input signal following the overvoltage protection. An amplifier
adjusts the Input signal according to the selection of the input voltage range.
6.2.3 Anti-aliasing Filter
The anti-aliasing filter is a second order analog filter with Bessel characteristic
and a limit frequency of 10
kHz. The filter can be neither configured nor
bridged.
NOTE
The software configurable filter of a measuring channel (analog inputs [AI]
and current measurement channels [PS] of the Power Stages) is automati
-
cally deactivated when the measurement channel is operated in the event
mode.
Analog Input Channel n
16 Bit A/D
Converter Input
Range
M easure-
ment
Unit Anti
Aliasing
FIR