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instruNet is the Highest-accuracy System with Low-level Measurements

instruNet is the highest-accuracy data acquisition system for performing low-level measurements (e.g. ±100mV), as shown in the below table. Accuracy decreases as you increase sample rate; therefore, when comparing products, compare their accuracy at the same sample rate. The instruNet card cage does not contain a noisy processor, which makes it easier to do accurate low-level measurements.

  Absolute Accuracy ±(% of reading + offset error) 1  
Company Product Voltage Range 100s/sec
sample rate 3
1,000s/sec
sample rate 3
10,000s/sec
sample rate 3
Price
GWI iNet-555 ±80mV ±(0.015% + 10ÁV) ±(0.015% + 10ÁV) n/a $630 + $36/ch
  iNet-555 + i423 ±80mV ±(0.018% + 10ÁV) ±(0.018% + 10ÁV) ±(0.018% + 27ÁV) $500 + $80/ch
NI 9 USB-9219 5 ±125mV ±(0.100% + 15ÁV) n/a n/a $1365 for 4 ch
  USB-6281 6 ±100mV ±(0.014% + 13ÁV) ±(0.014% + 13ÁV) ±(0.014% + 19ÁV) $2175 for 8 ch
  USB-6341 8 ±200mV ±(0.016% + 25ÁV) ±(0.016% + 26ÁV) ±(0.016% + 52ÁV) $1179 for 8 ch
MCC USB-2404-ui 7 ±125mV ±(0.100% + 15ÁV) n/a n/a $1000 for 4 ch
  USB-2408 8 ±78mV ±(0.040% + 13ÁV) ±(0.040% + 15ÁV) n/a $600 for 8 ch
DT USB-9828 2 ±156mV ±(0.030% + 20ÁV) n/a n/a $600 for 8 ch

 

 

instruNet is Lowest-cost Stand-alone system with Universal Inputs

instruNet is the lowest-cost STAND-ALONE data acquisition system with UNIVERSAL inputs, as shown in the below table. Universal inputs support the direct connection to Voltage, Current, Resistance Thermocouple, Thermistor, Strain Gage, Load Cell, RTD, and Accelerometer sensors; sometimes with the help of one additional shunt resistor. instruNet does this at $124 per channel with an 8-channel system, with unprecedented accuracy.

Company Product Max Aggregate
Sample Rate (s/sec)
Lowest
Voltage Range
Highest
Voltage Range
Price Price/Ch
GWI iNet-555, ≤ ±80mV 2,000 ±10mV ±80mV $990 for 8 ch $124
  iNet-555, ≥ ±600mV 166,000 ±0.6V ±10V " "
NI USB-9219 5 100 ±0.125V ±10V $1365 for 4 ch $341
MCC USB-2404-ui 7 100 ±0.125V ±60V $1000 for 4 ch $250

 

 

instruNet is Lowest-cost Card Cage system with Universal Inputs

instruNet is the lowest-cost CARD CAGE system with UNIVERSAL inputs, as shown in the below table. Card cages enable modules to be mixed and matched as needed. The below table is similar to the above table, yet with card cage based systems instead of non-expandable stand-alone.

Company Product Max Aggregate
Sample Rate (s/sec)
Lowest
Voltage Range
Highest
Voltage Range
Price
GWI iNet-555 + i420 Cards 2,000 ±0.02V ±10V $630 + $36/ch
  iNet-555 + i423 Cards 70,000 ±0.005V ±5V $500 + $80/ch
NI 4 slot cDaq + ni-9219 100 ±0.125V ±10V $771 + $266/ch
DataQ DI-718 + 8B Modules 4 4,800 ±0.01V ±60V $600 + $100/ch
Dewetron DEWE-50-USB2-8 200,000/ch ±0.01V ±1400V $7,500 + modules

 

 

instruNet is Lowest-cost Card Cage system with Voltage Inputs

instruNet is the lowest-cost CARD CAGE system with VOLTAGE inputs, as shown in the below table. This is similar to the above table, yet VOLTAGE-only inputs instead of the more expensive UNIVERSAL Inputs.

Company Product Max Aggregate
Sample Rate (s/sec)
Lowest
Voltage Range
Highest
Voltage Range
Price
GWI iNet-555 + i420 Cards 90,000 ±0.02V ±10V $630 + $36/ch
NI 4 slot cDaq + ni-9205 250,000 ±0.2V ±10V $771 + $53/ch
MCC DaqScan/2005 + Db85 200,000 ±0.15V ±10V $1900 + $61/ch
UEI DNA-PPC5 + ai-201-100 100,000 ±1.5V ±150V $1000 + $66/ch

 

 

instruNet is Lowest-cost system with Anti-aliasing Filters

instruNet is the lowest-cost data acquisition system with optional anti-aliasing filters, as shown in the below table. Anti-aliasing filters eliminate errors caused by high frequencies that enter the digitizer, as explained here.

Company Product Max
Sample Rate
Lowest
Voltage Range
Highest
Voltage Range
Direct Connect To Sensors Price Price/Ch
GWI i555 + i423 + i500 70ks/sec total ±0.005V ±5V yes $1000 + $190/ch $357
NI USB-4431 100ks/sec/ch ±10V ±10V no $2140 for 4 ch $550
mStar xdap7420 1Ms/sec/ch ±0.1V ±10V no $7000 for 8 ch $875

 

 

Footnotes

1 Absolute Accuracy Conditions: The system integrates (i.e. averages) for the entire duration of one sample period (e.g. repeatedly read a/d for 10mSec when digitizing at 100s/sec), the data acquisition hardware temperature changed 1°C since its last auto-calibration, and the ambient (e.g. room) temperature is 23°C ± 10C.

2 The USB-9828, and many other Data Translation products, have 0.25uA of input bias current. This current, multiplied by the source impedance, forms an error. For example, a 350 ohm strain gage you will incur an additional error of ±87uV (350*0.25).

3 Total aggregate sample rate for all channels. For example, with 1000s/sec aggregate and 4 channels, each channel is digitized at 250s/sec/channel.

4 The DataQ #DI-718 accuracy is 0.25%, which is approximately 10 times less accurate than instruNet.

5 The NI #USB-9219 maximum sample rate is 100s/sec, which is approximately 20 times slower than instruNet. Also, its cost-per-channel is approximately 3 times higher than instruNet.

6 The NI #USB-6281 is NI's most accurate system, and provides accuracy similar to instruNet, yet its cost-per-channel is 2 times more with 8 channels, and ≥ 3 times more with ≥ 16 channels.

7 The MCC #USB-2404-UI maximum sample rate is 100s/sec, which is approximately 20 times slower than instruNet. Also, its cost-per-channel is 2 times more than instruNet.

8 This system provides voltage-only inputs, and does not support the direct connection to many sensors.

9 "National Instruments" and "LabVIEW" are trademarks owned by National Instruments Corporation of Austin, Texas. This web site is in no way connected to, affiliated with, sponsored by, endorsed by, or otherwise associated with National Instruments Corporation. For detail on their products, which are of high quality, please see www.ni.com.