Geometrics.com

StrataVisor NZ or Geode Seismograph FAQ

1. I cannot find my saved SEG-Y files on my hard drive?

Unlike other SEG recording standards, SEG-Y stores trace information from multiple records in a single file. A new file is created when acquisition parameters are changed. You can examine a particular record by using the File menu item in your MGOS, SGOS, Controller, or StrataVisor NX software.



2. What is the wiring for the geophone input cable, the power cable, the trigger cable or the digital data cable for a Geode or StrataVisor NZ?

For wiring wiring diagrams for the Geode and NZ, click here. Note that additional wiring diagrams are available in the Geode/NZ manual, available from the downloads page.


3. I am having trouble triggering my seismograph.

Geometrics seismographs are designed to trigger on a contact closure, contact open, or signal input. The trigger circuit has protect from high voltages, but it is possible to damage the input circuit if voltages outside the specified range are connected directly to the input circuit. It is recommended that input signals, or voltages do not exceed + 10 volts.

A typical voltage measurement using a hand held volt meter on pins A (+) and B (-) of the 3 pin trigger input connector will be 4.9 volts DC. Voltages less than 4.0 volts may indicate a problem with the trigger circuitry. Often times the unit will continue to operate and trigger, but should be serviced at the next opportunity. If the circuit has been damaged, typical problems will include false triggers, or failure to trigger.

To verify the trigger function of the Seismograph, begin by removing the external connector from the trigger input, and short pins "A" and "B" together on the trigger input connector of the seismograph. The unit should trigger each time the pins touched as long as the interval between triggers is greater than the record time or the trigger hold off whichever is longer. It should not trigger unless these pins are touched. If consistent triggering is achieved using this method, then attach the hammer switch directly to the seismograph. Do not put the hammer switch on a hammer yet. Tap the hammer switch cylinder on the edge of a table or other hard object and verify consistent triggering. Watch the stack count on the screen to confirm each tap of the hammer switch results in a trigger of seismograph. Check the trigger hold off setting and trigger sensitivity settings. Set the trigger hold off to 0.5 sec. and the trigger sensitivity to 50. If the seismograph is triggering correctly, insert any trigger extension cables between the hammer switch and the seismograph. Repeat the test to confirm consistent triggering. Then attach the hammer switch to the hammer, or other device used for triggering. Make sure the cylinder of the hammer switch is firmly taped to the handle, and the direction of motion is across the diameter of the cylinder. You can also attach a geophone or other signal producing devise at this point and verify proper triggering.

If the unit does not properly trigger, contact Geometrics customer service with the results of the tests above for assistance.


4. Can I use an USB Ethernet adapter to run the Geode?

Yes, the following USB adapters are recommended:

Microsoft MN-110
SMC SMC2209USB/ETH
Netgear FA120

As an alternate choice: TRENDnet TU2-ET100
1) Microsoft version has the best software interface. It has a cable that has a strain relief into the small box. It uses a funnel strain relief. The problem with this one is USB 1.0 . It works on 2.0 but XP notices it is not high speed.

2) The SMC unit is best for physical implementation. It has a direct plug to USB and a cable extender. Software is OK.

3) The Net Gear is OK. Physical implementation is OK. Software works.

4) The Trend device is OK for physical properties. It is furnished with a 3 ½ inch floppy for drivers. For this reason we will not recommend it as first choice. It is completely acceptable if one of the others are not available.


5. The seismic controller software doesn't recognize all channels in my Geode when using a PCMCIA card in my laptop.

Engineering has tested a new PCMCIA Ethernet card for laptops. Our current supplier has been "Socket". This card was chosen for its rugged connection. The new card is made by Microsoft. Its part number is MN-120 (Geometrics part 20-000-048). It has a rugged RJ45 jack mounted on the side.

We have discovered that the existing Socket PCMCIA Ethernet card does not provide a link signal under XP. This is an inconvenience and does not prevent the Seismic Controller software from functioning. The Socket card works well with all Windows products prior to XP.

Geometrics has made the new Microsoft card standard for shipment with Geodes since most customers use XP these days. The new card is thicker due to the RJ45 connector. The additional thickness prevents a second Ethernet card from being installed. If you are going to build a system with 2 lines, it is acceptable (If the laptop has one internal Ethernet port). For systems with more than two lines either use the USB to Ethernet adapter or make the next line a Socket card (Geometrics part 20-000-045). We will keep the Socket card for larger systems.

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