User guide

Chelsea Technologies Group
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User Guide HB179 Issue 7.0
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47
In most instances, operation of the instrument as a self-logging unit is preferred over CTD
interfacing in terms of overall information quality and ease of access.
To access stored data follow the instructions refered to in HOST MODE in this manual. The
output data will be downloaded to a host computer as an XMODEM download, which will be
written as a comma separated variable (CSV) file on the host PC. The CSV format is chosen as
this is compatible with most standard spread sheet applications.
The following tables provide the format of data. The flash sequence data is transferred in blocks
preceded by a header record. The header record contains several fields defining flash
sequence and instruments parameters each separated by a comma.
Record format for sequence header
Field Ref. Format Comments
Synchronising string **** four asterisks
Sequence number SN NNNNN 1 to 99999
Channel Reference CR A (or B) ambient or dark channel
Saturation flash width SFW NNN.N saturation flashlet width in uS
Saturation flash count SFC NNN number of integrated flashlets
Saturation interflash delay SID NNN.N flash period in uS
Relaxation flash width DFW NNN.N relaxation flashlet width in uS
Relaxation flash count DFC NNN number of integrated flashlets
Relaxation interflash delay DID NNN.N flash period in uS
Number of averages NN Number of flash sequences used per data
point
Date DD:MM:YY
Time HH:MM:SS
PMT HV HV NNN up to 3 digit number
PAR NNNNN up to 5 digit number
Pressure NNNNN up to 5 digit number
Temperature (future use) ±NN.NN i °C - IPTS68 range -2 to 35
Conductivity (future use) NN mScm
-1
0 to 70
Supply voltage NN.NN main DC-DC converter output in V
Supply Current NNN supply current in mA
Instrument Temp. NN.N
Error Code H one byte HEX
PMT reference PCAL NNNNN
Acquisition mode NN
Autoranging Stored Value NN
Autoranging Upper Limit NN
Autoranging Lower Limit NN
Valid data (Autoranging) NN
Record format for saturation and relaxation data
Field Format Comments
Flash count NNN
Integrated reference NNNNNN size depends on the number of integrated
sample
Integrated Signal NNNNNN size depends on the number of integrated
sample