 | According to requirements of Maritime Administrations, there is a necessity for next inspections of EPIRBs after receiving of type approval. The problem is a complexity of the basic beacon signal parameters, which could not be measured with the simplified handheld testers. The most complicated for measuring and the most important for reliable communication to satellite and accurate position calculation are the frequency stability and phase modulation parameters. As a rule they require specially designed equipment in addition to standard measurement instruments (spectrum analyzer, frequency counter, etc.) which are not usually available on a ship board.
Beacon tester BT611 allows to perform not only control tests, but comparing evaluation of different EPIRBs parameters, too.
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When using BT611 you only have to connect it to PC. All basic parameters including mentioned ones will be accurately tested. | The BT611 is easy-to-use unique COSPAS/SARSAT beacon tester designed for high accuracy and resolution measurements of the full set of beacon signal parameters to check its compliance with the ones, specified in C/S doc. T.001, T.007. It is upgraded version of 601 model, which was successfully used as a test-bench equipment at approved by COSPAS/SARSAT laboratory (Sevastopol, Ukraine). The instrument integrates two independent amplitude and frequency measurement channels for 406.025 MHz and 121.5 MHz beacon transmitters. Any IBM-compatible computer could be connected to the instrument RS-232 port. Measurement functions and displayed results formats (graphics or tables) are selected from the computer key-board and soft-key menus. |
You could check visually frequency and phase behavior inside the burst during CW preamble and when it is modulated, statistical frequency stability parameters and, as a useful option to COSPAS/SARSAT requirements - rms frequency variations between the bursts. All specified burst and modulation time intervals are displayed.
Because of used new patented method of PSK signals processing, time, frequency, and phase measuring channels do not require any calibration. Their accuracy depends on reference oscillator stability only, which is appreciated by manufacturer as 1.5*10-7 in 10 years. The instrument provides high stability results when used for laboratory or field beacon tests.
The BT-611 is type approved by Veritas Bureau and has wheel mark. It's recommended for organizations/companies that provide any services of EPIRBs. Also it can be efficiently used in EPIRB manufacturing process for final product tests. | The main accuracy features | | Parameters to be measured | C/S required accuracy | BT611 accuracy | | 406 MHz channel | | Frequency stability | 1*10-10 | 5*10-12 | | Nominal frequency | +-100Hz | +-50Hz | | Inside burst Frequency shift | - | 0.1Hz | | Modulation index | 0.04 rad | 0.006 rad | | Modulation rise and Fall times | +25 ms | +10 ms | | Bit rate | 0.15% | 0.05% | | Power (when directly connected to the beacon) | 10% | 5% | | 121,5 MHz channel | | Carrier frequency | - | +-10 Hz | | Max. and min. Sweep Audio frequency | - | < 10% | | Modulation index | - | +-20% | | Peak power | - | +-10% |
Operating environment: operating temperature 10...45°C;
relative humidity up to 70% at 45°C.
Storage conditions: temperature -40...70°C;
humidity up to 90% at 60°C (non condensing).
Weight: net - 2 kg;
gross - 2.2 kg.
Dimensions: measuring device - 254x260x65 mm
antenna (when assembled):
height - 25 mm
bottom diameter - 260 mm |
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