User Manual

Landis+Gyr
32 98-2550 Rev AE Gridstream SCADA/DA S4SBR
3.10 Analog Input Functionality
This device provides two general purpose analog inputs. These are filtered and connected to a
10-bit A/D converter.
NOTE: The voltage reference for this A/D converter is 2.5 VDC +/- 60[mVDC] across the
operating temperature range.
This A/D converter has the following specifications:
Table 3 - 2. A/D Converter Specifications
A/D characteristic Specification
Resolution 10 bit
INL +/-5 LSB
Absolute Accuracy +/-5 LSB
DNL +/-1 LSB
Offset Error +/-3 LSB
Gain Error +/-3 LSB
NOTE: The actual sampling time is 0.25 μS and the conversion time is 2.75 μS, but the rate at
which signals on these inputs can be sampled in-practice is limited by the DCW execution. It is
recommended that these channels be used only for DC voltage measurement, and that the
sampling rate cannot exceed 100 mS.