4.6. HOW TO LOG DATA
4.6.2 Logging to an external USB memory device
The PolaRx5 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 4-26.
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 4-26:
Connecting an external USB memory device to the PolaRx5
With an external memory device connected, the new device should be visible in the
‘
Log
Sessions
’
window as shown in Figure 4-27.
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 4-27:
With a 2 GB external USB memory device connected to the PolaRx5
New logging sessions can then be de
fi
ned in a similar way as in Section 4.6.1 making sure to
select
‘
External
’
from the drop-down list in the
‘
Disk
’ fi
eld as shown in Figure 4-28.
*
The CBLe_USB_HOST is an optional item.
I
t is not part of the standard PolaRx5 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
37
