Pulse Input Adapters
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A typical setup for connecting a sensor with a mechanical switch output is shown below.
Figure 1: 2 Hz Pulse Input Adapter (S-UCD-M006) connected to a device that has a mechanical contact
closure output
Note
•
The Pulse Input Adapters consume about 1 µA of current with the input high (switch open) and
about 33 µA with the input low (switch closed). For maximum logger battery life, use the Pulse
Input Adapters with normally open switches or with transducers that are off (circuit open) for
90% of the time or longer.
Connecting to the Logger
To start using the Pulse Input Adapter, stop the logger and insert the adapter’s modular jack into an
available sensor connection port on the logger. If no port is available, use a 1-to-2 sensor connection
adapter (Onset Part # S-ADAPT), which allows you to plug two sensors into one port on the HOBO
Weather Station only. (The HOBO Weather Station supports a maximum of 15 data channels and 15
sensor ports. The HOBO Micro Station supports a maximum of 15 data channels and 4 sensor ports and
cannot be expanded with the 1-to-2 adapters.)
The logger automatically detects the new input adapter the next time you launch it. Launch the logger and
verify that the Pulse Input Adapter is functioning correctly. Refer to the
HOBO Weather Station User’s
Guide
for more details about connecting HOBO smart sensors to the HOBO Weather Station.
Verifying Functionality
To verify proper operation of the Pulse Input Adapter, connect the adapter to a logger and launch the
logger. With the logger launched, enter a known number of pulses (for example, if using a tipping-bucket
rain gauge, tip the bucket several times). Then read out the logger and verify that the number of pulses in
the data file is correct.
If you think that the Pulse Input Adapter is not capturing pulses, check the connections to the adapter and
verify that the device being measured is functioning normally. If you believe the adapter is not working
properly, you can send the adapter back to Onset for repair. Contact Onset or your Onset Authorized
Dealer for a Return Merchandise Authorization (RMA) number.
S-UCD-M006
Pulse Input Adapter
H21-001 HOBO Weather Station (shown)
or H21-002 HOBO Micro Station
Device with Mechanical Contact Closure Output
(Tipping-Bucket Rain Gauge shown as example)
Sensor
Normally Open
Switch
S-UCD-M006
Pulse Input Adapter
3.3 Volts
100 K Ohms
1 K Ohms
Input Port
GND
White
Black
