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FAQs How fast is the data transfer rate over the Ethernet? How do I restore the factory default network settings? Can I connect the LSA1000 to the network? What cable do I use to connect the LSA1000 to my computer? I have a 10Base-T computer or network. Can LSA1000’s 100Base-T Ethernet still work? Are there other interfaces available with LSA1000 besides Ethernet? How do I control the LSA1000 from my computer? Does LSA1000 support all software packages available for LeCroy DSO’s? How closely can multiple LSA1000 units be synchronized using External Reference Clock connections? What is the required rise time of the external referenece10MHz signal? NEW!: Is
LabView driver available for LSA1000? Is LabWindows/CVIdriver available for LSA1000? How to synchronize two LSA1000's Can the LSA1000 acquire data IN PARALLEL with a data transfer out of the system memory?
How fast is the data transfer rate over the Ethernet? For transferring1MB of waveform record over the direct connection to the PC, the benchmark numbers are: 10Base-T: 900KB/s 100Base-T:2 MB/s. Actual transfer rate will vary depending on the waveform record length and applications.
The factory default network settings can be restored by powering-up the unit with the Ethernet reset jumper closed. The reset jumper is accessible through the small hole next to the Ethernet connector on the rear panel.
Yes. As theLSA1000 is an Ethernet device, the LSA1000 can be connected to the network. However, if you are mainly concerned with the system throughput, network connection is not recommended as the network traffic will slowdown the LSA1000 data transfer rate.
For a direct connection to a PC, a cross-over cable is required while the network connection is made using a straight cable. See Operator’s Manual for more details.
Yes. LSA1000’s Ethernet interface supports auto negotiation and works with both 10 and 100Base-T network.
No. But let us know what other interfaces you’d like to see.
All functions of the LSA1000 can be controlled from the computer using the remote control commands. The only actions that cannot be performed remotely are power on or off. LSA1000’s remote control commands are the same as LeCroy DSO’s.
Yes. LSA1000 is compatible with all available software packages, but there are a few exceptions. Only pure "software" portion of DDFA is supported. No probes are supported as LSA1000 does not have the ProBus interface. MT packages are not supported at all presently. Ext. Ref. Clk In and Out connections can be used to synchronize multiple units of LSA1000.Thus multiple channels are easily supported by "stacking" LSA1000 units. There are timing issues however. All the units are not exactly timed to the sample. Any given configuration will be stable however and if relative timing is critical it should be measured and "calibrated".
The 10MHz reference is the reference to a PLL that multiplies that frequency to get the sample clock. Therefore using the same source and "daisy chaining" the REF IN will cause a slight difference in the phase of the reference with 3 feet of cable being around 4 nS (depending on the type of cable).However, the reference will be multiplied up to 500MHz. (Even at 1 GS/s the fastest clock frequency is 500MHz and we develop a 1 nS delay on the board.) As a result the maximum amount the two units could be off is 2nS. It doesn't matter that they don't catch the SAME clock relative to the input reference, they will both catch the NEXT clock. As far as the synchronization goes, since the phase of the 2 locked units is fixed - but not necessarily known - we suggest that for a given configuration of 10MHz reference into the units, the length of the trigger cables be adjusted (with the same signal into the inputs of the 2 units) to achieve the desired delay match.
The minimum suggested SLEW RATE for the REF IN signal is 0.3 nS/volt. A sinusoidal signal would not be advisable. That signal is AC coupled, buffered and translted to drive directly into an ECL gate. A sinusoid could cause excessive jitter.
What is the required rise time of the external referenece 10MHz signal? The minimum suggested SLEW RATE for the REF IN signal is 0.3 nS/volt. A sinusoidal signal would not be advisable. That signal is AC coupled, buffered and translted to drive directly into an ECL gate. A sinusoid could cause excessive jitter.
IsLabView driver available for LSA1000?
LSA1000 LabView driver is available on the web site for
download. - Download Drivers Here
Is LabWindows/CVI driver available for LSA1000? LSA1000 LabWindows/CVI driver is available on the web
site for download. Download
Drivers Here
How to synchronize two LSA1000's: 1. Power up two LSA1000's.Open up a session of Remote_LSA for each LSA1000. 2. Connect ref_out of the first LSA1000 to ref_in of the second LSA1000. 3. Use 4. Connect a 10MHz square wave to Ch 1 of each LSA1000 (approximately 50% FSR and 1ns risetime). Make sure cables going to Ch1 of the LSA1000's are the same length. 5. Provide an external trigger to each LSA1000. Trigger must be synchronous to 10MHz signal instep 4. 6. Set time/div to1ns, trigger to external, slope to positive, persistence to "on" for both LSA1000's. 7. Adjust the trigger delay of the first LSA1000 until the waveform triggers in the center of the display. Set the trigger delay of the second LSA1000 to the same value. 8. Adjust the length of the trigger cable going to the second LSA1000 until the two LSA1000's trigger at the same location on the display of Remote_LSA. With careful adjustment of the trigger cable length, the triggers between the two LSA1000's can be reduced to within 0.5ns.
Can the LSA1000 acquire data IN PARALLEL with a data transfer out of the system memory? Yes. The LSA1000 has two separate memories - Acquisition memory and system memory. The acquisition memory is the high speed memory that captures the data from the analog to digital converters. When an acquisition completes, the processor copies the data from the acquisition memory into the system memory. All subsequent operations (waveform processing or transfer via Ethernet) operate on the copy of the data residing in system memory. The LSA1000 cannot simultaneously read out data from acquisition memory while a new acquisition is being acquired. But, because there is always a copy of the most recent completed acquisition in system memory, it is possible to acquire a new waveform to acquisition memory while simultaneously transferring the waveform that is residing in system memory. If an LSA1000 is armed and trigger occurs while it is in the middle of transferring a waveform over Ethernet, the new data will sit in the acquisition memory until the processor is finished with the current transfer. After finishing the Ethernet transfer, the processor will see that the acquisition is finished and immediately copy the new data into system memory. Once the data is copied out, the LSA1000 is ready to be rearmed. |
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