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Please note: these questions refer to the FS4100 USB 1.0 product. Please click here to go to the FS4120 USB 2.0 frequently asked questions page.

Q. How can I get the latest USB Analysis Probe features? I have an older unit.

A. Order product number FS1005, which is the USB Firmware Upgrade to Version F for the FS4100. You can see which firmware version you have by checking the label on the bottom of your FS4100 USB Analysis Probe.

Q. If I update my Agilent logic analyzer to increase the memory depth will I see better performance of the USB analysis probe?

A. This is a difficult question but we can tell you how the USB analysis probe uses memory and this may assist you in your decision. The analysis probe only clocks USB events or packets to memory, if the bus is idle no analyzer memory is used. The analysis probe buffers the Token packets and sends the entire packet on one clock to the analyzer thus taking 1 of your 4k locations. Data packets will consist of the data pid and the first 2 bytes of data, on each subsequent clock another 2 bytes of data will be clocked (the last data byte may be a single data byte in the case of an odd number of bytes) and the final 2 bytes of crc. Hence for 64 bytes of data, the probe would use 33 locations (32 data and 1 crc). Ack packets take a single location.

If a reset event occurs, a status is sent to the analyzer that indicates the start of Reset. When Reset ends, another status is sent to the analyzer that indicates Reset end, thus two memory locations are used for RESET. Suspend and Resume events are handled in a similar way. All packets types and events are available for triggering and store qualification. If the bus under analysis is not busy then the memory could be filled up with Start of Frame indications (or keep alive if it is slow speed). These may of course be filtered out so you can leave your memory available for what you are interested in.

Q. We have a Agilent 1650A logic analyzer. Can we use your USB analysis probe with it?

A. Sorry, we don't support the Agilent 16510A/B or 1650A/B because we have signals on channel 16. We suggest you contact Agilent about upgrading to a more recent machine.

Q. We have purchased your USB Analyzer for our use. We want to know if there is a way to view the USB data that we saved on the Agilent Logic Analyzer on a PC (using Windows or DOS)?

A. If you are using the 16600, 16700 or 16702A mainframes or the 16505 prototype analyzer you can use the FILE OUT tool to put the data in ASCII format to a file, then transfer that file to a PC. You can also use the WEB enabled feature on these mainframes to open the data in an EXCEL spread sheet format. If you are using the older frames or a portable you can save the LISTING to disk (floppy) and then transfer it to a PC. Refer to your mainframe manual's or on-line HELP for more info. We also have a product that can be used with the Agilent Off Line Viewer on a Windows NT/2000/XP class PC.

Q. How do I find out what are the latest versions of Agilent logic analyzer operating software?

A. Contact your nearest Agilent Call Center.

Q. How do I know which Agilent logic analyzer is best for my needs?

A. Click here.

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