Specifications for Model 401    



Model 401 TCP/IP-Interfaced 24-Bit Data Acquisition System
 


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software
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Sample applications
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updated 2-22-07
Application Guidance
updated 10-26-15
Source code
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updated 2-22-07
current DLL
updated 2-22-12


OVERVIEW
The Model 401 is a complete, high-resolution Delta-Sigma data acquisition system with a TCP/IP interface. It uses an extremely capable micro controller with substantial RAM and program memory available. This processing power will allow future versions to have greatly extended functionality. The battery-backed RAM and non-volatile flash memory available will make stand-alone data acquisition practical for many applications. The connector pinout is identical to the Model 301 and the programming interface is very similar. That makes it easy to support both USB and TCP/IP from the same application.

Lawson Labs has been designing and building high-resolution Delta-Sigma Data Acquisition Systems since 1991. The Model 401 represents our seventh generation of Delta-Sigma design. It incorporates the electrical isolation and input protection that have long allowed our high resolution systems to function reliably in the industrial environment.

The standard analog input range is +/- 5 volts, true differential. The maximum single-channel data rate is 1000 Hz at 20 bits effective resolution. Both channels can be scanned at 100 Hz with effective resolution of 20 bits. As the unit is slowed down, it quickly gains effective bits to 22 bits at 200 Hz and 22.5 at 50 Hz for single-channel operation. The input impedance is 1013 ohms and the DC common mode rejection is typically -100 dB. The isolated portion of the Model 401 operates from a single unregulated power supply.

Drivers are provided for Win98 through Win10, with VisualBasic and VisualC++ sample application code. Multiple A/Ds can be added using inexpensive 10Base-T Ethernet hubs. Units can be dynamically connected or disconnected without interrupting other ongoing acquisition.



SPECIFICATIONS
A/D TYPE
24-bit delta-sigma converter with microcontroller supervisor and electrical isolation.

MONOTONICITY
23 bits

LINEARITY
+/-0.002% of full scale.

DIFFERENTIAL INPUT RANGE
+/-5 volts

DC COMMON MODE RANGE
+/-6.5 volts

DC COMMON MODE REJECTION
-100 dB typical

ANALOG INPUTS
2, multiplexed true differential protected to +/-60 volts.

INPUT IMPEDANCE
1013 ohms typical

PROGRAMMABLE DATA RATE
10 to 1000 Hz, lower rates are generated through digital averaging.

EFFECTIVE RESOLUTION
Effective resolution is defined as total resolution in bits minus RMS noise in bits.
Figures below use an oversampling ratio of four.

Rate
Effective Resolution in Bits
1000
20
500
21
200
22
50
22.5


SCANNING MODE
Three scan types are available, single channel, multi-channel, and a calibration scan that adds a reading of the zero channel at the end of each scan for offset drift compensation. The max number of data points per second in multi-channel scanning mode is 200. A digital input is added into the data stream after each conversion. That feature allows maximum timing accuracy for digital events.

DIGITAL INPUTS
8 bits, contact closure or 5 volt logic compatible.

DIGITAL OUTPUTS
8 latched, ruggedized, double-buffered 5V outputs.

POWER REQUIREMENT
14 to 28 VDC, regulated or unregulated, for isolated circuitry

TYPICAL POWER CONSUMPTION
The Model 401 requires 120 mA (add drive current for active digital outputs, up to 20 mA each).

SIZE
Board only 5.5 x 3.7 x 1.4"
Enclosure 6 x 4.1 x 1.5"

SINGLE-PIECE PRICE
$495 board with wall-mount power supply

OTHER OPTIONS
Custom Input Ranges of +/-2v, +/-1v, +1/-0.4v, +/- 200mV, +/- 100mV.
Consult factory for other ranges. ($25)

 25-Pin Screw Terminal Adapter.  ($25)

 Optional rugged steel enclosure  ($60)


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 A BNC connector input adapter is available for $40.




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