Vaisala WMT700 - Manual (Page 49)

Chapter 5 ______________________________ Operating WMT700 with WS425 and SDI-12 profiles
VAISALA _______________________________________________________________________ 47
indication is given with the single character P or F. This is followed by
the description of the measured parameter, which is followed by the
actual measured value.
The Bad 1 second readings counter is a running total of the number of
fundamental 1-second readings that the sensor flagged as bad. This
number rolls over to zero after reaching the count value of 65535. It is
initialized to zero on each power-up or any other activity that performs a
re-initialization of the sensor. The time measurement quality indices are
given for path numbers as follows:
- Path 0 is from south transducer to north transducer
- Path 1 is from north transducer to south transducer
- Path 2 is from north transducer to east transducer
- Path 3 is from east transducer to north transducer
- Path 4 is from east transducer to south transducer
- Path 5 is from south transducer to east transducer
A listing for the command response is given below with representative
values.
<CR><LF>
P Heater voltage 22.3 Volts <CR><LF>
P Array heater resistance 4.9 Ohms <CR><LF>
P Heaters off voltage 0.1 Volts <CR><LF>
P Incoming supply voltage 12.2 Volts <CR><LF>
P 5.0 volt supply 5.05 Volts <CR><LF>
P 10 volt supply 10.2 Volts CR LF
- Bad 1 second reading counter 0 <CR><LF>
P Path 0 signal quality index 99 <CR><LF>
P Path 1 signal quality index 99 <CR><LF>
P Path 2 signal quality index 99 <CR><LF>
P Path 3 signal quality index 99 <CR><LF>
P Path 4 signal quality index 99 <CR><LF>
P Path 5 signal quality index 99 <CR><LF>
The test limits for the various tests are as listed below:
- Heater voltage good in range 18.0 to 26.0 V
- Array heater resistance good in range 4.0 to 6.0 Ω
- Heaters off voltage good if below 0.5 V
- Incoming supply voltage good in range 10.5 to 13.5 V
- 5.0 V supply good in range 4.5 to 5.5 V
- 10 V supply good in range 9.0 to 11.0 V
- Signal Quality Index good above 50