Loggers with BPR channels interface a Paroscientific Inc. transducer. The logger measure precisely the output frequencies from the transducer. Those transducers generally outputs two signals, one for pressure and one for temperature.
There are two channels for the periods measured (peri_00 and peri_01). But in order to convert them in a meaningful pressure and temperature, the logger provides two channels which implement the calibration equation from Paroscientific Inc. They rely on two type of equations: deri_bprpres (pressure in dbar) and deri_bprtemp (temperature in °C).
The following applies to loggers with channels bpr_08 and bpr_09 types (loggers manufactured since november 2015). For former types of BPR channels, pleaser refer to the bpr command.
deri_bprpres equation
- The coefficients x0 ... x10 are provided by Paroscientic Inc. and obeys to the following bijection:
| Paroscientific Inc. coefficient | U0 | C1 | C2 | C3 | D1 | D2 | T1 | T2 | T3 | T4 | T5 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| deri_bprpres coefficient | x0 | x1 | x2 | x3 | x4 | x5 | x6 | x7 | x8 | x9 | x10 |
- n0 is the index of the pressure period channel, in this example 1
- value( n0 ) is the final output value of the pressure period channel in picoseconds.
- n1 is the index of the temperature period channel, in this example 2
- value( n1 ) is the final output value of the temperature period channel in picoseconds.
deri_bprtemp equation
- The coefficients x0 ... x3 are provided by Paroscientic Inc. and obeys to the following bijection:
| Paroscientific Inc. coefficient | U0 | Y1 | Y2 | Y3 |
|---|---|---|---|---|
| deri_bprtemp coefficient | x0 | x1 | x2 | x3 |
- n0 is the index of the temperature period channel, in this example 2
- value( n0 ) is the final output value of the temperature period channel in picoseconds.
Example commands
>> calibration 3 type
<< calibration 3 type = bpr_08
>> calibration 4 type
<< calibration 4 type = bpr_09
( Confirm the channel type )
>> calibration 3 datetime= 20151123120721, x0 = 5.8310298E+00, x1 = -24.514029E+03, x2 = -573.64117E+00, x3 = 76.129281E+03, x4 = 35.688001E-03, x5 = 0.0000000E+00, x6 = 30.413169E+00, x7 = 664.14898E-03
<< calibration 3 datetime = 20151123120721, x0 = 5.8310300e+000, x1 = -24.514030e+003, x2 = -573.64115e+000, x3 = 76.129280e+003, x4 = 35.688000e-003, x5 = 0.0000000e+000, x6 = 30.413170e+000, x7 = 664.14899e-003
>> calibration 3 x8 = 58.803409E+00, x9 = 180.91160E+00, DATETIME = 20151123120721, x10 = 0.0000000E+00
<< calibration 3 datetime = 20151123120721, x8 = 58.803408e+000, x9 = 180.91160e+000, x10 = 0.0000000e+000
( Set the pressure coefficients provided by Paroscientific Inc.)
<< calibration 4 datetime = 20151123120722, x0 = 5.8310300e+000, x1 = -3.8981210e+003, x2 = -10.493120e+003, x3 = 0.0000000e+000
( Set the temperature coefficients provided by Paroscientific Inc.)
>> calibration 3
<< calibration 3 type = bpr_08, datetime = 20151123120721, x0 = 5.8310300e+000, x1 = -24.514030e+003, x2 = -573.64115e+000, x3 = 76.129280e+003, x4 = 35.688000e-003, x5 = 0.0000000e+000, x6 = 30.413170e+000, x7 = 664.14899e-003, x8 = 58.803408e+000, x9 = 180.91160e+000, x10 = 0.0000000e+000, n0 = 1, n1 = 2
>> calibration 4
<< calibration 4 type = bpr_09, datetime = 20151123120722, x0 = 5.8310300e+000, x1 = -3.8981210e+003, x2 = -10.493120e+003, x3 = 0.0000000e+000, n0 = 2
( Request confirmation of everything for pressure and temperature coefficients)