Specification Sheet

MODEL 203 20-BIT DATA ACQUISITION SYSTEM

External A/D Converter Systems

Serial Port Interface

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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 +/-60v.

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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