This command requests the verbose Built-In Test (BIT) results.
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.
|Heater voltage||18.0 … 26.0 V|
|Array heater resistance range|
|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|