Measurement Computing WaveBook rev.5.3 - Manual (Page 115)

WaveBook User’s Manual – IO version 979194 Troubleshooting 7-7
7. Channel readings are wrong.
Possible Causes Details and Possible Solutions
The channel is
turned off.
The On/Off column in WaveView’s Channel Configuration screen must be selected to “On” for the
applicable module.
There are no
input signals
connected.
Verify that the channel inputs actually have input signals connected to them. Inputs that are not actually
connected to a signal may behave erratically and result in erroneous readings. Unused channels should
be turned off or at least shorted to analog common to prevent their values from floating.
The Simulated
Instrument
mode is
selected.
Channel readings will not be true if WaveView is in the “Simulated Instrument” mode. When in this
mode the readings displayed are, as the mode’s name implies, simulated and there is no correlation to
the signal lines connected to the hardware. If this is the case, simply select the desired WaveBook from
the “Select Device” option in WaveView’s System pull-down menu.
The scaling via
y = mx + b
needs adjusted.
Readings can be off due to improper scaling such as volts to millivolts, incorrectly configured TC or 5B
module types or user defined mX+b equations. In the case of voltage readings (V), ensure that the units
being displayed are not being displayed in mV. The “Units” section of the WaveView document
includes an example of how the y = mx + b equation is used for scaling.
The chart’s
limits need
adjusted.
Make sure that the amplitude of the signal being measured falls within the current min./max. scale
settings of the chart’s Y axis. The upper and lower limits can be changed after the acquisition is
stopped. Simply type the new scale limits over the current ones. The Collect and View Data section of
the WaveView document provides additional information.
The wrong
channel is
assigned to the
chart.
Erroneous readings can be due to the wrong channel having been assigned to the chart. Make sure that
the intended channel was selected. In WaveView, the channel is selected from a list box in the upper
right-hand corner of the chart. The channels will appear in the list based on their “Label” from the main
Channel Configuration spread sheet.
An option card
was installed or
removed by the
user. These
are:
WBK11A
WBK12A
WBK13A
WBK30
If an option card (WBK11A, WBK12A, or WBK13A) was removed or installed outside of the factory,
acquired data will likely be erroneous. If this is the case, contact the factory or your service
representative.
WaveBook/516E Users: WBK option cards, including the WBK30 memory card, are installed in
WaveBook/516E at the factory per customer order. Users are not to remove or install these cards as the
cards are not “plug-and-play” with respect to WaveBook/516E . Erroneous signal values can result. If
you desire to remove or add a card to WaveBook/516E contact the factory or your service
representative.
WaveBook/516, /516A, /512A, and WBK10A Users: With exception of the WBK30 option, WBK
option cards for WaveBook/516, /516A, /512A, and WBK10A are installed at the factory per customer
order . Users are not to remove or install cards [other than WBK30 series cards] as the cards are not
“plug-and-play” for these devices and erroneous signal values could result. If you desire to remove or
add a card to these products, contact the factory or your service representative.
WBK30 Note: If a WBK30 memory option has been removed and the three associated bypass jumpers
have not been installed inside the WaveBook (on header J101), communications to the PC will not
occur. WaveBook/516E users will need to contact the factory in regard to WBK30 issues. Users of
other WaveBook models should refer to the WBK30 section of the WBK Options User’s Manual
(p/n 489-0902).
WBK15
Channel
Issues
In regard to WBK15, in addition to this table refer to table 8, WBK15 channel readings are wrong.