6
INTERNAL CHANNELS
The PROLOGGER has four internal channels. These are presented as high
resolution values (signed 16 bit) in Register Addresses 232 to 239 as detailed
below:
Name
Description
Register Address
I0 (Temp) logger Temperature (0.1221°C per bit)
232
I1 (10V)
10V reference (1.221 mV per bit)
234
I2 (Batt)
logger battery (or supply) voltage
(1.221 mV per bit)
236
I3 (5V)
5V scan synchronised reference voltage
(1.221 mV per bit)
238
The values of these internal channels are available for recording (logging) or
use in computations in the User Log Program. Typical uses may be to provide
high accuracy corrections to bridge measurements (strain gauge/PT100 etc.)
referenced to the 10V or 5V supplies.
The temperature (which is in thermal contact with the Analog ground point
adjacent to the Input Signal connector) can be used to provide cold junction
compensation for thermocouples connected to the Input connector.
6.1
Battery Voltage Monitor (I2, “Batt”)
Battery voltage is automatically monitored by the logger and recording will
cease if the battery falls below a defined threshold (the logger goes into sleep
mode). The threshold is defined in the Configuration Table (see page 47). The
battery state is also displayed on the Battery Status LEDs while the logger is
operating (see page 20 for details).
UNIDATA
32 INTERNAL CHANNELS
Summary of Contents for Starlog Prologger 7001
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