Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 79
9.3.4.2. 0-5V A and 0-5V B
Connection A: 0-5V A Terminal #36 and Signal ground Terminal #37
Connection B: 0-5V B Terminal #34and Signal ground Terminal #35
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 Satlink 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.
9.3.4.3. Diff C, Diff D , Diff E
Connection: Diff C (Terminal #32 and #33)
Connection: Diff D (Terminal #28 and #29)
Connection: Diff E (Terminal #24 and #25)
Optional connection to VREF (#26 or #30) and Signal ground (#27 and #31) as needed
Measurements Diff C, Diff D, and Diff E 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
signal + 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 Satlink logger. (i.e. the sensor outputs must be able to be floated with respect
the grounding of the sensor itself)
The negative voltage (or positive voltage) must remain within the range of the
differential input range selected.
The common mode input range of the differential inputs must not be exceeded (see
below).
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