Vaisala HMT140 - Manual (Page 66)

Appendix Specifications and Troubleshooting
58 VAISALA
Troubleshooting
Use HMT140 Utility to help troubleshoot issues that may
occur while connecting the HMT140 to a wireless network.
HMT140 Operation Mode
When the Configuration Cable is connected to the HMT140,
it enters “Config mode”. In this mode, the HMT140
continuously attempts to connect to the wireless network and
stays connected until the Configuration Cable is disconnected
or the setup has changed.
The HMT140 is in “Transmitter mode” when the
Configuration Cable is not connected, and the HMT140
power switch is turned on. When in Transmitter mode, the
HMT140 remains in a low power state, but will turn on,
connect, transmit a UDP packet, and then go back to the low
power state when it is ready to transmit.
Signal Strength
The HMT140 works best with signal strengths above -63 dbm
(for 802.11b mode) and -75dbm (for 802.11g mode). If the
signal strength is less, the HMT140 may work marginally or
not at all. Stronger signal strength improves transmission
performance.
Since the signal strength will vary from sample to sample,
you should take multiple samples to determine the signal
strength. View signal strength on the Status tab and in the
Available Networks window (click the Find Networks
button on the Setup tab).
Table 7: External Power Supply Options
Property Description/ Value
External source 9V DC to 28V DC
Current rating 1.7A to /.5A DC
Power 15 Watt