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TiltMeter Engineering Data

These are raw uncalibrated data that mark SPIKE and NTPSYS occurrence of .apt files and they are a product of a middleware driver. The .eng files is not something RBR generates. These .eng files only contain NTPSYNC entries and SPIKE entries. The NTPSYNC entries indicate when the tiltmeter’s internal clock synchronizes to the NTP server (specified in the tiltmeter’s configuration). These NTP synchronizations occur about once per minute. The SPIKE entries indicate a non-deterministic event of a large spike in the APT data.

The document describing file format of .apt files can be found at 75

Oceans 2.0 API filterdataProductCode=ENG

RBR manufacturer data sheet: http://rbr-global.com/wp-content/uploads/2017/10/0005642revA-RBRconcerto-APT.pdf

General file format description: https://docs.rbr-global.com/apt

Formats

Format is .eng, consisting of comma-separated numeric values as shown in the section below. The file names file extension .eng. 

Oceans 2.0 API filterextension=eng

Examples

A sample .eng file would look as follows:

10/31/2019 11:26:47.634, #NTPSYNC, 2019-10-31 11:26:47.496, 2000-01-21 16:15:50.150, 624049857346
10/31/2019 11:27:56.753, #NTPSYNC, 2019-10-31 11:27:56.697, 2000-01-21 16:16:59.350, 624049857347
10/31/2019 11:29:06.573, #NTPSYNC, 2019-10-31 11:29:06.446, 2000-01-21 16:18:09.100, 624049857346
10/31/2019 11:30:16.390, #NTPSYNC, 2019-10-31 11:30:16.197, 2000-01-21 16:19:18.850, 624049857347
10/31/2019 11:31:25.502, #NTPSYNC, 2019-10-31 11:31:25.446, 2000-01-21 16:20:28.100, 624049857346
10/31/2019 11:32:35.218, #NTPSYNC, 2019-10-31 11:32:35.096, 2000-01-21 16:21:37.750, 624049857346
10/31/2019 11:33:06.214, #SPIKE, 2019-10-31 11:33:05.446, 2000-01-21 16:22:08.100, 29732631.482183933, 30199103.914201259, 31094318.004325032, 5782788.656651974, 28667137.911543253, 5853620.592970401
10/31/2019 11:33:06.214, #SPIKE, 2019-10-31 11:33:05.496, 2000-01-21 16:22:08.150, 29732631.007209420, 30199104.594066739, 31094317.408278584, 5764074.071776122, 28667137.818410992, 5853620.599955321


Each line contains the following information for SPIKE events:
1Timestamp of  middlewareYYYY-MM-DD HH:MM:SS.sss format.The timestamp that the middleware reports. 
2Event TypeSPIKE These events are extracted from the .apt files

3

Logger time NTP time corrected

YYYY-MM-DD HH:MM:SS.sss format.

The time that the internal logger reports corrected with the latest NTP offset.

4

Logger time

YYYY-MM-DD HH:MM:SS.sss format.

The time that the internal logger reports. Drift should be ±60s/year.

5

Accelerometer X period (picoseconds)

Double precision (64 bit) floating point number.

The period of the X (first) channel of the triaxial accelerometer.

6

Accelerometer Y period (ps)

Double precision (64 bit) floating point number.

The period of the Y (second) channel of the triaxial accelerometer.

7

Accelerometer Z period (ps)

Double precision (64 bit) floating point number.

The period of the Z (third) channel of the triaxial accelerometer.

8

Accelerometer temperature period (ps)

Double precision (64 bit) floating point number.

The period of the temperature (fourth) channel of the triaxial accelerometer.

9

BPR pressure period (ps)

Double precision (64 bit) floating point number.

The period of the pressure (first) channel of the BPR.

10

BPR temperature period (ps)

Double precision (64 bit) floating point number.

The period of the temperature (first) channel of the BPR.

Each line contains the following information for NTPSYNC events: 
1Timestamp of  middlewareYYYY-MM-DD HH:MM:SS.sss format.The timestamp that the middleware reports. 
2Event TypeNTPSYNCThis corresponds to NTP synchronization events

3

Logger time NTP time corrected

YYYY-MM-DD HH:MM:SS.sss format.

The time that the internal logger reports corrected with the latest NTP offset.

4

Logger time

YYYY-MM-DD HH:MM:SS.sss format.

The time that the internal logger reports. Drift should be ±60s/year.

5

NTP offset

ms

New NTP offset in milliseconds


Sample for download: RBRTILTMETERACCBPR63055_20181022T090159.030Z.eng

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