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0-5V A and 0-5V B
Connection A: Terminal #32 analog ground and terminal #31 0-5V signal
Connection B: Terminal #30 analog ground and terminal #29 0-5V signal
Inputs 0-5V A and 0-5B are designed to be general purpose 0-5 Volt DC input. While sometimes referred to
as a single-ended input, it is designed to measure voltage with respect to analog signal ground. These
inputs have a high impedance (>2 Meg Ohms) and will not load down or draw significant current. The
input range is 0V to 5V. Negative voltages with respect to SIGNAL GROUND may NOT be measured on
these inputs.
To connect a sensor:
The voltage
output
by the sensor should be connected to either A or B.
The
analog ground
from the sensor needs to be connected to Signal ground.
The sensor will likely require
power
–
connect that to VREF if 2.5V is appropriate or to +SWD#1
POWER which is 12V (or whatever power the station is supplied with). Make sure to set up the
warmup (the amount of time to power the sensor before reading its output) as required by the
sensor.
If the sensor has a power ground, connect that to Signal Ground.
Diff C, Diff D
Connection: Diff C (Terminals #28 and #27)
Connection: Diff D (Terminals #24 and #23)
Optional connection to VREF (#25 or #21) and Signal ground (#26 and #22) as needed
Measurements Diff C, and Diff D are designed to operate with a special type of analog output found on
many sensors that use a bridge configuration or any sensor that outputs a very small voltage. This input
type has a + and - input that connects to the sensor output.
Typically, a bridge sensor will be powered on VREF (sometimes referred to as excitation), have a
and signal
–
, and provide a wire for the analog ground. NOTE: If after wiring the sensor, it displays a
negative reading, you may reverse the + and - leads coming from the sensor.
Reading Negative Output Voltages on Differential Inputs:
In limited cases, sensors with negative outputs may be used on the differential inputs with the following
limitations:
The negative line from the sensor must not connect to the digital ground of the sensor with the
sensor making a ground connection to the ground (including antenna ground) of the station. (i.e.
the sensor outputs must be able to be floated with respect the grounding of the sensor itself)
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