SEPTENTRIO PolaRx5S, User Manual

Page: 32 / 107

4.5. HOW TO LOG DATA
4.5.2 Logging to an external USB memory device
The PolaRx5S can also log data to an external memory device. To connect the device, you
will need a USB Host cable
*
(CBLe_USB_HOST) to connect to the front-panel socket indicated
by the USB icon as shown in Figure 4-20.
A high-quality memory device is recommended for external logging as multiple logging
sessions can result in a large throughput of data. The 4K random write speed should be
greater than 0.1 MBps, and the 4K random read speed should be at least 2 MBps
†
.
Figure 4-20: Connecting an external USB memory device to the PolaRx5S
With an external memory device connected, the new device should be visible in the ‘ Log
Sessions ’ window as shown in Figure 4-21. I f the device is not formatted or the formatting is
not compatible with the receiver fi le system, you will be prompted to format the device. This
can be done by clicking on the ‘ Format ’ button.
Figure 4-21: With a 2 GB external USB memory device connected to the PolaRx5S
New logging sessions can then be de fi ned in a similar way as in Section 4.5.1 making sure to
select ‘ External ’ from the drop-down list in the ‘ Disk ’ fi eld as shown in Figure 4-22.
* The CBLe_USB_HOST is an optional item. I t is not part of the standard PolaRx5S delivery
†
The 4K random read/write speed is a standard speci fi cation for memory devices. More information and a
list of benchmarked devices can be found on: http://usb.userbenchmark.com
32