Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 69)

CDM-VW300 Series Dynamic Vibrating-Wire Analyzers
512 – 767
(200 – 2FF Hex)
True
1024 – 1279
(400 – 4FF Hex)
True
1280 – 1535
(500 – 5FF Hex)
True True
1536 – 1791
(600 – 6FF Hex)
True True
2048 – 2303
(800 – 8FF Hex)
True
2304 – 2559
(900 – 9FF Hex)
True True
2560 – 2815
(A00 – AFF
Hex)
True True
The excitation level associated with a diagnostic code can be calculated. This
is done by subtracting the low diagnostic code boundary value (shown in the
first column) from the raw diagnostic value and dividing the difference by
42.5. For example, a raw diagnostic value of 1650 falls within the range 1536
to 1791. Subtract 1536 from 1650 and divide the result, 114 (the result will
always fall between 0 and 255), by 42.5. The result is 2.68 V.
Ranges outside those listed in TABLE 8-2, Diagnostic Code Ranges, should
only occur in conjunction with hardware or operational errors reported by the
datalogger.
8.5.2 Standard Deviation of Dynamic Output
A 1 Hz calculation of standard deviation from an array of dynamic readings
can be obtained from the output of the CDM_VW300Static() instruction. A
significant increase in standard deviation from a baseline may indicate a
problem with either the sensor or the structure or phenomena being measured.
Take appropriate steps to identify the source of any unexpected change in
standard deviation.
8.6 Factory Default Reset
Products that use an operating system and memory may occasionally require a
reset to factory defaults. A default reset is probably near the end of the list of
troubleshooting techniques used when some aspect of a data-acquisition system
is not functioning or returning the expected results.
Use DevConfig to reset Campbell Scientific products to factory defaults. The
following procedure is a guide to resetting factory defaults. When resetting to
factory defaults, first preserve the current state of the device.
1. Connect the product to the PC. For the CDM-VW300 and SC-CPI
interface, connection is made via a male-USB to type-micro-B male USB
cable.
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