Single Board Throughput; Multiple Board Throughput - Measurement Computing USB-1616FS User Manual

USB-1616FS User's Guide

Single board throughput

The USB-1616FS has an integral USB hub, which allows up to four USB-1616FS boards to be daisy
chained and connected to a single USB 2.0 port on the host computer. The data shown in Table 4-1 reflects
the throughput that can be expected in single board systems. For details on throughput in systems using
multiple USB-1616FS boards, please refer to the next section, titled "Multiple board throughput."
Number of Input Channels
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
The throughput data in Table 4-1 applies to a single USB-1616FS device installation only.
Note 2:
Maximum throughput scanning to PC memory is highly machine dependent.
The rates specified in Table 4-1 are for Windows XP only. The maximum throughput rates on
operating systems that predate Windows XP may be less and must be determined through
testing on your machine.

Multiple board throughput

The USB-1616FS has an integral USB hub, which allows up to four USB-1616FS boards to be daisy
chained and connected to a single USB 2.0 port on the host computer. (The data shown in Table 4-1 reflects
the throughput that can be expected in single board systems.) The transfer of USB-1616FS data over the
USB bus is very CPU intensive. The transfer rate using multiple USB-1616FS boards is both CPU
intensive and system dependent. This makes it impossible for us to provide a guaranteed spec for multi-
board maximum sample rate. 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
boards 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, etc.
*the maximum sample rate of any one channel is limited to 50 KS/s.
Table 4-1. Single board throughput: Scan to PC memory
Per-channel Throughput (kS/s)
(Note 2)
50000
50000
36000
30000
25000
22000
19000
17000
15000
14000
12500
12000
11250
10500
10000
9500
4-2
Specifications