This command requests the verbose Built-In Test (BIT) results.
WS<CR><LF>The command gives a textual run down of the results of all Built-In Tests (BITs). In every line, except the bad reading counter, the pass/fail 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 12.0 Ohms <CR><LF>
P Heaters off voltage 0.00 Volts <CR><LF>
P Thermistor temperature 30.3 C <CR><LF>
F Incoming supply voltage 11.5 Volts <CR><LF>
P 5.0 volt supply 5.00 Volts <CR><LF>
P 10 volt supply 10.00 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 are listed in the following table.
| Test | Limit | |
|---|---|---|
| Heater voltage | 18.0 … 26.0 V | |
| Array heater resistance range | ||
| Heating option | ||
| Non-heated | Not applicable | |
| Heated transducers | 46.5 … 77.5 Ohm | |
| Heated transducers and arms | 9 … 15 Ohm | |
| Heated transducers, arms and body | 9 … 15 Ohm | |
| Incoming supply voltage | 10.5 … 13.5 V | |
| 5.0 V supply | 4.5 … 5.5 V | |
| 10 V supply | 9.0 … 11.0 V | |
| Signal quality index | Above 50 | |