Campbell LoggerNet, Инструкция по эксплуатации

Страница: 212 / 580

Section 6. Network Status and Resolving Communication Problems
Front 2T – Applicable only to an RF Link Quality test, this is the
minimum transition point of all T2 transitions within the tolerance
window. (See Section 6.5.3.2,
TD-RF Quality Report .)
Back 2T – Applicable only to an RF Link Quality test, this is the
maximum transition point of all T2 transitions within the tolerance
window. (See Section 6.5.3.2,
TD-RF Quality Report .)
Front 1T – Applicable only to an RF Link Quality test, this is the
minimum transition point of all T1 transition within the tolerance window.
(See Section 6.5.3.2,
TD-RF Quality Report .)
Back 1T – Applicable only to an RF Link Quality test, this is the
maximum transition point of all T1 transitions within the tolerance
window. (See Section 6.5.3.2,
TD-RF Quality Report .)
Base Codes – The codes sent to the Base modem to activate the Advanced
Features (see Section 6.5.3.3, Advanced Features ) or define an RF path for
the RF Link Quality test.
Link Quality – Applicable only to an RF Link Quality test, the Link
Quality indicator provides an intuitive means of quickly determining the
relative merit of RF Links. If tracked over time, one can easily identify
variances and trends in link quality.
The numerical value for Link Quality is derived from the detailed
information contained in the TD-RF Quality Report and has a theoretical
range of 0 to 102, with greater values equating to greater quality. In
practice, the maximum value can only be achieved in a laboratory
environment, and the minimum value will never be returned as it is
indicative of an inability to decode the test pattern; the RF Link Quality
test would timeout. In the real world, typical values for a viable link will
fall into mid-range.
The following equation is used to derive the Link Quality value:
Q = [102 – (StdDev(F1T,B1T,F2T,B2T))] * (TestPktSize / (237+NumRptrs)
Where:
Q = Link Quality
StdDev() = Population standard deviation
F1T = Front 1T
B1T = Back 1T
F2T = Front 2T
B2T = Back 2T
TestPktSize = Number of bytes reported in the test packet
NumRptrs = Number of RF repeaters in the complete RF path
Save to File – When this checkbox is checked, all entries in the right-hand
pane are also written to a text file in LoggerNet’s working directory
(C:\Campbellsci\LoggerNet\Logs\RFTestResults.log). Entries in the file are
limited to maximum of ten thousand records. After reaching the limit, the
oldest two thousand records are deleted.
"1/3/2013 9:20:14 AM" "RFRemote-PB" "RFBase-TD" 239 44 137 65 169 50.92
"1/3/2013 9:20:14 AM" "RFRemote-PB_2" "RFRemote-PB" 239 46 142 61 171 49.22
6-22