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Search result for: id10=WA 0821 7001 0763 (FORTRESS) Pintu Baja Smart Door Lock Pemalang Pemalang
| # | Post Title | Result Info | Date | User | Forum |
| GPS Clock Options for the Geode/SCS | 19 Relevance | 2 years ago | Gretchen Schmauder | Software | |
| GPS Clocks, used in Continuous Recording systems to provide 1 pps signal to trigger seismograph. Also provides GPZDA serial string to stamp records with UTC for Continuous Recording and Self-Triggering systems. Includes cable set to connect clock to PC, seismograph, and 12V DC power. There are three GPS clock options for the Geode we sell. They are: GS-101B GPS clock from Orca, 1 pps accurate to within 100 ns of the precise time. Includes waterproof antenna with separate electronics module, with display of time and other indicators. Provides time base during loss of satellite Lock. Options to provide 1 pps referenced to an IRIG-B generating source and to enclose electronics module in hardened aluminum case (P/N 25374-59). A101 Smart Antenna GPS clock from Hemisphere GPS, 1 pps accurate to within 20 ns of the precise time. Includes waterproof antenna with integrated electronics, with indicator of satellite Lock, no display of time. Provides time base during loss of satellite Lock. GC200 GPS clock from San Jose GPS, 1 pps accurate to within 1 μs of the precise time. Includes waterproof antenna with integrated electronics, no display of time or other indicators. No time base during loss of satellite Lock. The level of precision needed determines which GPS clock is best suited for the job. Typically the GC200 fulfills the needs of 95% of our clients. | |||||
| Why does it take so long for my MagArrow GPS to lock? | 13 Relevance | 2 years ago | Rui Zhang | Hardware | |
| 1. Make sure the MagArrow top cover (the curved side) is facing up and under a clear sky. 2. It may take up to 20 minutes for the GPS to Lock during the initial power up. Afterwards, the GPS stores the location information for a while (~40 minutes for MagArrow I and ~ 2 hours for MagArrow II) without the power so that it can Lock much faster than 20 minutes (~2-3minutes) during subsequent powerups. 3. If the powerup Locking time is significantly longer or intermittent GPS dropouts are observed during flight: MagArrow I will need to be sent back to Geometrics for repair. MagArrow II customers may choose to unscrew the external helical antenna (or attach the external helical antenna) and check whether the longer-than-normal Locking time or the intermittent issue goes away. MagArrow II has an independent internal and external antenna design. When the external helical antenna is attached (unattached), the system switches to the external (internal) antenna automatically. | |||||
| Basic Troubleshooting Techniques for OhmMapper | 10 Relevance | 2 years ago | Gretchen Schmauder | Application | |
| 1. When the transmitter is turned on, the red power light (or green light in later versions) comes on and stays on. The blue light will go into a rapid flashing pattern then settles into a three-flash sequence, for example short-long-short or short-long-long, or something like that. Is that what the transmitter is doing? If not, there are three possible causes of the problem and this will require require swapping parts: Defective dipole cable or shorting plugs are two potential problems. The best test is to plug the shorting plugs directly into both ends of the Transmitter and turn on. If this works, then add one dipole cable and turn on again. Then add the second cable and power up. If failure occurs with just the shorting plugs then the most likely problem is a battery with a shorted internal cell. This will look like it is fully charged when you measure it with a volt meter, but will not be able to supply the current required to drive the transmitter. Swap out batteries to test. If swapping the batteries does not resolve the issue and you never get the blue light to start flashing you may have a bad Tx and it would need to be returned to Geometrics. 2. When the receiver is turned on the red power light will come on, then the blue light will flash rapidly, then the blue light will turn off waiting for the receiver to phase Lock onto the Tx. Once it Locks onto the transmitter the blue light will start flashing at once per measurement. Depending on how conductive the ground is and how far apart the Tx/Rx separation is you may have to wait up to a minute to get the Lock. Try it with about a 5 meter separation between the end of the dipoles, i.e. the equivalent to having a 5-meter rope between them. The Rx should Lock and start flashing within about 20 seconds. If it never Locks on even though the Tx's blue light is flashing then there may be something wrong with the receiver and it would need to be sent back. Remember that the transmitter blue light has to be flashing first. If the Tx is not working the Rx will never detect it and start flashing. 3. With the Rx turned on, even if the blue light is not flashing, when you look at the OhmMapper Test screen on the console do you see the message: Setting Gain, Phase A, Phase B or something similar being updated on the screen every second (or twice per second with the old systems)? If so your console is communicating with the receiver. If not, you have no communication between the Rx and the console so you could have a bad dipole cable, bad optical wand, bad console cable, or a bad receiver. If you have spares of any of these items you can troubleshoot the problem. If you have no spares then you will need to send the system back here for evaluation by submitting an RMA request. | |||||
| MFAM 1 PPS signal input, 10 MHz reference input and synchronization | 7 Relevance | 2 years ago | Rui Zhang | Hardware | |
| The 1PPS pulse phase Locks and synchronizes the sample interval to be in Lock step with the GPS. Thus once Locked there will always be 1000 samples per second, with the sample beginning time precisely lined up with the 1 PPS edge. The 10 MHz input is for a different function. This input phase Locks the 40 MHz master reference oscillator to the incoming 10 MHz, which is usually a GPS disciplined reference oscillator or atomic clock (in other words exactly 10 MHz). This phase Locks the 40 MHz reference oscillator to exactly 40 MHz. The 40 MHz oscillator is the time base reference for calculating the Larmor frequency, and therefor the magnetic field value. Even though the 40MHz oscillator is really good even without the 10 MHz input, there is some drift in the 40 MHz over time (mostly thermal drift and some aging). For some applications where they need to measure very low frequency and low amplitude changes in the magnetic field the 10 MHz input will allow drifts in the reference oscillator to be removed. Without that it would be impossible to distinguish between reference oscillator drifts and low frequency low amplitude changes in the magnetic field. The connector for the 10 MHz input is SMB RF connector from Molex. If you must simulate the 1 PPS signal in a GPS denied environment, please be aware of certain requirements of the 1 PPS signal. 1. The Lock range for the 1 PPS input pulse is very narrow. The simulated 1 PPS signal must be within 100 ppm of an exact 1 Hz PPS signal (100us). 2. Timing jitter must be small (less than 0.5 ppm, 0.5us) too. If you are setting a GPIO pin on a microcontroller, there may be some concern about timing jitter due to interrupt latency or other processor tasks delaying the I/O pin toggle. Any rectangular waveform should work but the leading edge must be very close to 1 Hertz. It is the positive edge that specifies the 1 second rollover. | |||||
| MagArrow Magnetic Contamination FAQ | 6 Relevance | 2 years ago | Gretchen Schmauder | Application | |
| Magnetic contamination can be a problem, though rarely. Most often this is caused when a “permanent” magnetic component was accidentally attached to or close to one of the sensors. This can cause big shifts randomly in the data from one or both sensors. Check by removing the sensor Door and visually inspect the two MFAM sensors and their surrounding areas for anything unusual. If you have another magnetometer, like the G-864, you can also measure the magnetic signature of the sensor part of the MagArrow with the following instructions. Turn on the magnetometer Wave the sensor part of the MagArrow above the magnetometer (as close as possible but not touching) Wave in both west and east directions Check whether this is any magnetometer reading change when the MagArrow passes by If reading changes are observed, there must be some contamination. | |||||
