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12-Bit 0–5 Volt Input Adapter (S-VIA-CM14) Manual
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
The 12-Bit 0-5 Volt Input Adapter is used for measuring voltage levels and provides a trigger
source voltage for powering external sensors and an open collector trigger. The input adapter
has a plug-in modular connector that allows it to be added easily to a logger.
Specifications
Measurement Range 0 to 5 V
12-Bit 0–5 Volt Input
Adapter
S-VIA-CM14
Items Included:
• Hook and loop tape
• Cable ties
Accuracy ±0.025 V (±0.5% full scale) over full temperature range of -40°C to
Resolution ±1.221 mV
Input Impedance 1 MΩ
Maximum Input Voltage
Sensor Trigger: Open Collector Maximum sink current: 115 mA
Sensor Trigger: Source Voltage: 2.5 V ±2.4%; maximum current: 1 mA
Operating Temperature Range -40°C to 75°C (-40°F to 167°F)
Housing Plastic case; must be placed inside logger enclosure to protect from
User Connection Six-position screw terminal strip (16–30AWG); shielded cable
Dimensions 4.5 x 4.8 x 1.6 cm (1.8 x 1.9 x 0.6 in.)
eight 25 g (0.88 oz)
Number of Data Channels* 1
Measurement Averaging Option Yes
Digital Filtering
Bits per Sample 12
Length of Smart Sensor
Network Cable*
* A single station can accommodate 15 data channels and up to 100 m (328 ft) of smart sensor cable (the digital
communications portion of the sensor cables), although available space in the enclosure may limit the number of
sensors you can attach.
75°C (-40°F to 167°F)
30 V
On time: 12.7 ms ±3%
On time: 12.7 ms ±3%
direct exposure to the weather
recommended with outside diameter of 3.2 to 3.8 mm (0.125 to
0.150 in.)
Automatic digital filtering with 32 readings/sample in 2.4 ms
14 cm (5.5 in.)
The CE Marking identifies this product as complying with all r
directives in the European Union (EU).
elevant
Mounting
Use the self-adhesive hook-and-loop tape included in the package to mount the input adapter
inside the logger enclosure. To mount more than one adapter, use the back of the logger
enclosure door.
For the HOBO Micro Station, you can place the input adapter inside the logger enclosure and
allow it to float freely. It is not necessary to use the hook-and-loop tape.
Mounting Considerations
• If sensor cables are left on the ground, use a conduit to protect against animals, lawn
mowers, exposure to chemicals, etc.
• Refer to the logger manual for additional details on mounting.
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Attaching Sensor Cables
Insert the cable through the opening at the bottom of the
logger enclosure as described in the logger manual. Be sure to
provide “drip loops” underneath the logger to prevent water
from trickling up the cable and into the logger.
Use the included cable tie to provide strain relief to the cable
(or individual wires), as shown below.
Cable Strain Relief
Sensor Input Connections
The 12-Bit 0–5 Volt Input Adapter utilizes a 6-position screwterminal block for sensor connections with wire sizes ranging
from 16 to 30AWG. Pin numbers, names and descriptions are as
follows:
Pin # Pin Name Definition
1 GROUND Ground. Used as a common
connection.
2 TRIG. OPEN COLL. Trigger open collector (used to
activate external sensors). Provides a
switched ground for external power
sources (connects to ground when
trigger signal is “true”). Can also be
used in conjunction with external pullup resistor to trigger external
circuitry. Maximum 30 V, 115 mA. See
Operation for timing diagrams.
3 VOLTAGE INPUT Provides voltage input for sampling.
4 TRIG. SOURCE Trigger source. Provides voltage from
the logger’s battery to power, or
trigger, the external circuitry.
Maximum 2.5 V, 1 mA. See Operation
below for timing diagrams.
5 NC No connection.
6 SHIELD Connects cable shield for noise
suppression and circuit protection.
Typical Setup
A typical voltage transducer setup is shown in the following
diagram with power and shield connections. This configuration
requires the transducer to be continuously powered.
12-Bit 0–5 Volt Input Adapter (S-VIA-CM14) Manual
Transducer Setup
Connecting the Adapter to a logger
To use the 12-Bit 0–5 Volt Input Adapter, stop the logger and
insert the adapter’s modular jack into an available sensor
connection port on the logger.
The logger automatically detects the new input adapter the
next time you launch it. Launch the logger and verify that the
input adapter is functioning correctly. Measurements are
recorded in volts (V). See the logger manual for details.
Operation
The 12-Bit 0–5 Volt Input Adapter uses digital filtering and
optional measurement averaging to reduce the effect of noise
and improve accuracy.
Regardless of whether measurement averaging is used or not,
each sample is comprised of a 10.3 ms (± 3%) warmup period
and a 2.4 ms (± 3%) sample period. During the sample period,
digital filtering is accomplished by taking 32 readings. These
readings are then averaged to produce a single measurement,
as shown in the following diagram:
Measurement Averaging (Not to Scale)
Optional measurement averaging can be selected at launch.
Use measurement averaging if measurements may fluctuate
significantly within the logging interval. Measurement
averaging helps to prevent the sampling error known as
aliasing.
To use measurement averaging, set the Sampling Interval to a
rate that is faster than the logging interval. When measurement
averaging is selected in this way, the adapter takes several
measurements during the logging interval and averages them
to produce a single logged data point. For example, if the
logging interval is 10 minutes and the sampling interval is 1
minute, each recorded data point is the average of 10
measurements.
Note that fast sampling intervals (less than one minute)
significantly reduce battery life.
For more information about sampling intervals, refer to the
logger manual.
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Maintenance
With normal usage, if the adapter is installed correctly, the
adapter’s circuitry is protected against excessive moisture and
does not require any maintenance or cleaning. However, in an
unusually wet environment, excessive moisture can collect in
the logger enclosure and adversely affect measurement
accuracy and communications in the adapter module.
The circuit board is conformal coated to provide limited
protection against moisture, but if you observe heavy
condensation, consider the following options:
• Verify that the logger is installed properly and sealed
according to the instructions given in the logger user
manual.
• Consider moving the logger to a location that is better
protected from moisture, is better ventilated, or receives
some sunlight to help keep the logger dry.
• Apply WD-40, LPS 1, or 711 to the six-position terminal
block and the modular connectors to displace moisture
and help prevent corrosion. (Other spray lubricants may
be appropriate; check product labeling to ensure that it is
safe to use on plastics and electronics.)
12-Bit 0–5 Volt Input Adapter (S-VIA-CM14) Manual
Verifying Accuracy
You should check the accuracy of the 12-Bit 0–5 Volt Input
Adapter annually. Verify the accuracy of the input adapter
against a known standard, such as a calibrated voltage source.
If it is not providing accurate data, it may have been damaged.
© 2003–2017 Onset Computer Corporation. All rights reserved. Onset and HOBO are trademarks or registered
trademarks of Onset Computer Corporation. All other trademarks are the property of their respective
companies.
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