Throughput Benchmarks; Usage Note - Measurement Computing USB-1616FS User Manual

USB-1616FS User's Guide

Throughput benchmarks

Throughput System
240 kS/s 2.4 GHz P4 running Win XP, Service Pack 2, using an integrated USB Enhanced Host Controller
(EHC) port
240 kS/s 2.4 GHz P4, Phoenix BIOS, Win XP, Service Pack 2, integrated USB EHC port
130 kS/s 2 GHz, Xeon, Win XP, Service Pack 2, hyperthreading turned OFF, using an integrated USB EHC
port
220 kS/s
2 GHz, Xeon, Win XP, Service Pack 2, hyperthreading turned ON, using an integrated USB EHC
port
260 kS/s 2.4 GHz, P4 running Win XP, Service Pack 1, using Belkin PCI-bus USB 2.0 card
250 kS/s 2.4 GHz, P4 running Win XP, Service Pack 1, using StarTec PCI-bus USB 2.0 card

Usage note

The typical limiting factor on throughput is CPU usage. At maximum system throughput, virtually all
available CPU power will be consumed by the USB data transfer. This is an important note since running
your system close to its maximum throughput will certainly limit the amount of CPU power available for
running other concurrent processes (e.g. plotting or real-time analysis).
Range
±10 V
±5 V
±2 V
±1 V
Range % of Reading
±10 V 0.04
±5 V 0.04
±2 V 0.04
±1 V 0.04
Range
±10 V
±5 V
±2 V
±1 V
Noise distribution is determined by gathering 50 k samples with analog inputs tied to ground (AGND) at
the user connector. Samples are gathered at the maximum specified sampling rate of 50 kS/s.
Table 4-2. Calibrated absolute accuracy
Accuracy (mV)
±5.66
±2.98
±1.31
±0.68
Table 4-3. Accuracy components - all values are (±)
Gain Error at FS (mV)
4.00
2.00
0.80
0.40
Table 4-4. Noise performance
Typical Counts
10
10
11
14
4-3
Specifications
Offset (mV)
1.66
0.98
0.51
0.28
LSBrms
1.52
1.52
1.67
2.12