Omega Engineering RD8900 Storage Media CF Card, Data Security, Infrared Detector IR Detector

1.4 Storage Media CF Card

The Solid Compact Flash Memory Card (CF Card ) 16 MB capacity is a free standard storage media used for this instrument. Its compact size, anti-dust and anti-vibration features increase its reliability. To read measured data on CF Card, add a CF reader on USB port of PC. Higher capacity 64 and 128MB CF Cards are upon request. Alternatively the user may purchase locally. To ensure compatibility, we recommended only two brands SanDisk and Transcend.

To read the configuration and measured data on CF card for the first time, it is necessary to press Save key to save configuration, and then press Dump key to Dump measured data from the recorder to the CF card before inserting it into the CF card reader. If configurations been changed afterwards, press both keys before insert CF card into reader. If configuration remains unchanged, press Dump key only.

Each record of data uses 2 bytes of CF card memory.. If the Log Speed ( the recording speed of measured data ) is set to the fastest speed at 1 second per data, then for a single channel, 16 MB CF card will last approximately 92 days 16 MB 懭( 2 bytes x 24 hours x 60 minutes x 60 seconds .

The following formula is to calculate how many days the CF card could do saving before it is full.

The ? days = The capacity of CF Card / ( 2 bytes / the Log Speed x the working hours per day x 3600 seconds )

To avoid loosing recorded data while storing on PC, it is necessary to insert CF card back again into the recorder soon after loading recorded data onto PC.

1.5 Data Security

The recorded data is stored in the manufacturer’s special binary format. It is not possible to manipulate or modify those recorded data. This feature fully guarantees the security of the data.

1.6 Infrared Detector ( IR Detector )

The use of Passive Infrared technology on the recorder is an innovative idea to prolong the lifetime of the LCD display. The detector senses the movement of body heat from a distance of approximately 2 meters. This feature works together with the Screensaver. For example, if the IR Sensor is turned on and Screensaver set to 10 Min, then the display will turn off 10 minutes after the user walks away from the recorder. The Passive Infra Red detects when the user returns to the recorder and the display turns on straight away, no need to press any key on the recorder. If the user does not prefer using this function, it can be disabled.

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