Single board throughput, Multiple board throughput – Measurement Computing USB-1616FS User Manual
Page 23
USB-1616FS User's Guide
Specifications
23
Single board throughput
The USB-1616FS has an integral USB hub, which allows up to four USB-1616FS devices to be daisy chained
and connected to a single USB 2.0 port on the host computer. The data shown in Table 2 reflects the throughput
that can be expected in single board systems. For details on throughput in systems using multiple USB-1616FS
devices, refer to
Table 2. Single board throughput: Scan to PC memory specifications
Number of Input Channels
Per-channel Throughput (kS/s)
(Note 2)
1
50000
2
50000
3
36000
4
30000
5
25000
6
22000
7
19000
8
17000
9
15000
10
14000
11
12500
12
12000
13
11250
14
10500
15
10000
16
9500
Note 2:
The throughput data in Table 2 applies to a single USB-1616FS installation only. Maximum
throughput scanning to PC memory is machine dependent. The rates specified in Table 2 is for
Windows XP only.
Multiple board throughput
The USB-1616FS has an integral USB hub, which allows up to four USB-1616FS devices to be daisy chained
and connected to a single USB 2.0 port on the host computer. The data shown in Table 2 reflects the throughput
that can be expected in single board systems.
The transfer of USB-1616FS data over the USB bus is CPU intensive. The transfer rate using multiple
USB-1616FS devices is both CPU intensive and system dependent. This makes it impossible for us to provide a
guaranteed multi-board maximum sample rate specification. However, the benchmark performance shown
below should serve as a guide for what you may expect.
Multiple board performance is limited by an overall aggregate sample rate. The maximum throughput will be in
number of samples taken per second irrespective of the number of channels sampled* or number of devices
installed. For example, if the maximum throughput in a system is 150,000 samples per second, you may sample
20 channels at 7.5 kS/s, 30 channels at 5 kS/s, 40 channels at 3.75 kS/s, and so on.
* The maximum sample rate of any one channel is limited to 50 kS/s.