Specification Sheet

MODEL 203 20-BIT DATA ACQUISITION SYSTEM


 
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TYPE
Serially interfaced 20-bit delta-sigma (these converters have excellent noise rejection)

MONOTONICITY
20 bits.

LINEARITY
+/-0.006% of full scale, typical

DIFFERENTIAL INPUT RANGE
+/-5 volts (voltages from +5.0 to +6.5 and from -5.0 to -6.5 can be measured with slightly reduced accuracy)
Custom gains are available for input ranges between +/-5 and +/-0.1 volts

DC COMMON MODE RANGE
+/-6.5 volts.

DC COMMON MODE REJECTION
-96 dB minimum.

ANALOG INPUT
Single true differential protected to +/-60 volts

INPUT IMPEDANCE
100,000 megohms typical.

LINE FREQUENCY REJECTION
Programmable, 50 or 60 Hz (-86 dB min).

PROGRAMMABLE DATA RATE
0.5 to 120 Hz.

DATA RATE/RESOLUTION DESCRIPTION
The Model 203 has a programmable data rate which also determines the cut-off frequency of the low-pass filter. Effective resolution increases as the data rate decreases. Representative values are given below. Effective resolution is defined as total resolution in bits minus RMS noise in bits.

DATA RATE 120 Hz 60 Hz 30 Hz 20 Hz 10 Hz 5 Hz 2 Hz 1 Hz
CUT-OFF FREQUENCY 24 Hz 12 Hz 6 Hz 4 Hz 2 Hz 1 Hz 0.4 Hz 0.2 Hz
EFFECTIVE RESOLUTION (BITS) 15.0 16.0 17.0 17.5 18.5 19.5 20.5 21.5


ANALOG OUTPUTS
2, programmable 10 to 14 bit resolution, settling time 1 sec for 99% of full-scale step at 14 bits (Faster settling is available as a special option.)

DIGITAL INPUT
Single bit, contact closure or 5 volt logic compatible

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

POWER REQUIREMENT
11 to 16 VDC, regulated (15 to 22 VDC regulated or unregulated with pre-regulator option).

TYPICAL POWER CONSUMPTION
65 milliamps (plus drive current for digital outputs).

SIZE
3.4 x 6.5 x 0.9 inches .

SERIAL INTERFACE
RS232, optically isolated, full duplex
Programmable from 300 to 9600 BAUD with automatic BAUD rate detection
Checksum transmitted on request

OTHER FEATURES
Signal averaging and integration are available under software control
The Model 203 can operate in polled or scanning mode. In polled mode, individual readings are transmitted on request. In scanning mode, data is transmitted at a pre-defined rate.
The user has complete control over digital and analog outputs while scanning. The analog input stream is not disrupted by other input/output.

OPTIONS
For improved accuracy and temperature stability, a precision voltage reference option is offered at $20. If a regulated power supply is not available for use, add $20 for the power supply option. It includes an on-board regulator plus a wall-mount power supply.

CUSTOM MODIFICATIONS
Can be customized to perform a variety of tasks. If you do not see a particular feature here, call for a quotation.

SINGLE-PIECE PRICE
$250, driver software and serial cable included.

OEM PRICE
$150 (quantity 1000).

AVAILABILITY
Stock to 2 weeks.

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