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This file format is frequently used in field tests with the Pacific Data Model 9820 recorder.

Bendix format files consist of a header block followed by binary data. The header structure used in these files is defined below:

typedef struct tagHEADER {

short Model;

short Chan;

short Module;

short Config;

short NumPost;

short Profile[15];

char Eventname[40];

double Trigger;

short CounterLoop;

long StartTime;

char Status[8];

short Memory;

char Engineering[14];

float Baseline;

float Calibration;

char AutoX[8];

float LowerLimit;

float UpperLimit;

char AutoY[8];

float PlotStart;

float FinishPlot;

short PostSegs;

short SEGM[16];

char TriggerStatus[8];

char ProtectSwitch[8];

char ProtectFlag[8];

char ErrStatus[8];

char FilterValue[8];

char Measurement[14];

char StampTime[8];

char StampDate[10];

char Bunker[14];

char AmpGain[8];

long DECTrigger;

long DECDummy;

float VoltsLSB1;

float VoltsLSB2;

char AmpNumber[14];

char CableNumber[14];

char JBoxNumber[14];

char GageNumber[14];

char GageType[14];

char CableType[14];

char TermResistor[14];

char OperName[14];

short NumberChannels;

float VoltsLSB3;

float VoltsLSB4;

short SampleClockCode;

short CoarseOffset;

short FineOffset;

short Dummy[296];

char DataBaseVersion[2];

} HEADER;

The Bendix format is used for a variety of Pacific Data recorder models. However, DPlot only supports files produced with the model 9820 recorder (Model=9820 in the Header block).

Calibration data (if present) consists of 1024 2-byte values located between offsets 1024-3071 in the file. The raw data for Model 9820 files starts at offset 3072 in the file. Raw data is organized into 15 segments of either 4096 or 8192 2-byte integers each. Each segment can have a unique time step. The time step (in microseconds) for a given segment is determined from:

dT = 1.0 << (16-(Profile[segment] & 15);

The raw data and calibration data are translated to engineering units by:

Y = float(Volts-2047)*VoltsLSB1;

where Volts represents the raw data, and VoltsLSB1 is from the file header.

If calibration data is present (indicated by a non-zero Calibration in the header), the output amplitudes are adjusted by:

Y = (Y - CalBase)*Calibration /(CalCal-CalBase);

where CalBase is the average of the 1st and 3rd blocks of 256 calibration values, and CalCal is the average of the 2nd and 4th blocks of 256 calibration values.

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