Using Campbell AVW2xx Vibrating Wire Interfaces – MultiLogger Application Note #21 – Page 13 of 13
Troubleshooting
The Campbell AVW200 Operators Manual has additional information on trouble-shooting, particularly for
the wireless deployments.
It also contains information on using the Device Configuration software to view the vibrating wire signal
responses to trouble-shoot poorly performing gages or noisy environments.
This section will provide guidelines to aid in trouble-shooting the commonly encountered issues.
MultiLogger provides several metrics to aid in troubleshooting, as follows:
• When instruments are disconnected or otherwise fail to read the Text Monitor will show
OVERRANGE, or a stored value of -99999. The minimum amplitude used to verify a gage
measurement is 0.1mV This may need to be adjusted for some instrument types.
• When the AVW2xx is disconnected or otherwise unable to communicate with the MCU the Text
Monitor will display a value of -99998.
• UserLoc(1) holds the output amplitude of the vibrating wire signal. This can be added to the Text
Monitor (you’ll need to turn off Auto Configure Locations in the Configure | Preferences form
of Logger to view this location).
• Additional metrics such as Signal-to-Noise Ratio (SNR) can be shown in the UserLocs by editing
the instruction file for the selected Gage Type | Make | Model (press the gear button and remove
the comment characters from the lines of programming).
Follow these steps to resolve the commonly encountered issues:
1. Check all power connections. When using the RF4xx make sure the red PWR led is lit.
2. Check all wiring connections. Use the diagrams provided in this Application Note.
3. Use the Device Configuration software to check settings in the AVW2xx per instructions outlined
previously. If using SDI-12 with directly connected AVW2xx’s check the SDI-12 address setting.
This should be set to 0. If using other interfaces double-check the PakBus ID.
4. If using a wireless deployment use the Device Configuration software to check that the radio and
AVW2xx wireless settings match. The Hop Sequence and Net Address MUST MATCH. Also
the Power Mode should match, other combinations to reduce power consumption should be
tested thoroughly prior and during deployment.
5. If using a wireless deployment then check all antenna cabling and connections. Check signal
strength using the RF4xx diagnostics.
6. If using multiplexers with the AVW2xx make sure the correct multiplexer Model is selected. If
using the MCU to control multiplexers then select the model of the multiplexer attached. If using
the AVW2xx to control to the multiplexers then make sure the multiplexer Model is set to
AVW2xx.
7. Check that the Gage Type | Make | Model selected for each channel matches the wiring and
AVW2xx configuration.
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