Model 203A - 3 1/2 Digit DC Voltmeter with BCD Output

3 1/2 DIGIT DC VOLTMETER WITH BCD OUTPUT
MODEL 203A

NEMA-SIZE Case

Connections Diagram

STANDARD FEATURES
Parallel BCD output
±1,999-count display span
±200 mV to ±200 V dc ranges
3-wire ratio input
1500 Vp CMV, 100 db CMR
Bright, 0.56 in (14.2 mm) LED display
Automatic zero and polarity
115/230 V ac power
1/8 DIN case

OPTIONS
High-impedance 3-wire ratio input
Isolated, stored, three-state parallel BCD
5 V dc power
Isolated 9-32 V dc power
Isolated 26-56 V dc power
Screw-terminal barrier strip
NEMA-4 splash-proof lens cover
NEMA-size case

Model 203A is a low-cost ±1,999-count DC voltmeter with unbuffered, non-isolated parallel BCD output as a standard feature. This output is good for about 1 feet and allows the 203A to be interfaced to a digital comparator (Model 872A) or a printer (Model 820A). For applications which require long cable runs or multiplexing of BCD signals, three-state, isolated, parallel BCD output is available as an option.

OPTIONS
The meter main assembly can be electrically configured for four input ranges and high-impedance 3-wire ratio input. Upper-board options include three BCD output boards. Mechanical options for the standard 1/8 DIN case include a screw-terminal barrier strip for signal and power and a splash-proof lens cover which meets NEMA-4 standards. A NEMA-size case is optional. For additional information, please refer to the Options and Mechanical sections.

SPECIFICATIONS

ANAOLG INPUT

Range	±199.9 V	±1.999 V	±19.99 V	±199.9 V
Resolution	100 µV	1 mV	10 mV	100 mV
Maximum Input	100 Vp	250 Vp	250 Vp	250 Vp
Input Resistance	1 Gohm	1 Gohm	1.1 Mohm	1.0 Mohm
Bias Current	2 nA	2 nA	200 pA	20 pA

Configuration: Bipolar, single-ended
Zero: Automatic
Span Adjustment: ±3.1%

NOISE REJECTION
NMR: 20 dB, 50/60 Hz
CMR: 100 dB, DC to 60 Hz
CMV: 1500 Vp per HV test, 354 Vp per IEC spacing

ACCURACY AT 25°C
Maximum error: ±0.05% of reading ±1.5 count
Span tempco: ±0.01% of reading/°C
Step response: 1 s
Warmup to rated accuracy: 1 min

ANALOG-TO-DIGITAL CONVERSION
Technique: Dual-slope, average-value
Polarity: Automatic
Signal integration period: 3.3 ms
Read rate: 4/sec or 0-4/sec with ext control scale

3-WIRE RATIO REFERENCE

Analog input range	±200 mV	±2, ±20, ±200 V
External refernce input	+0.05 to +0.4V	+0.5 to +2.0 V
Load on reference, std	430 ohm	4.3 kohm
Load on reference, opt	100 Mohm	100 Mohm
Accuracy	99.9% ±0.1%	99.9% ±0.1%

DISPLAY
Type: 7-segment, red LED
Height: 0.56 in (14.2 mm)
Symbols: 1.8.8.8.8
Decimal points: Four positions selectable by jumpers from front panel or at connector, 10 mA sink
Overrange indication: Four least-significant digits flash

DIGITAL SIGNALS
Output signals: TTL-compatible
Input signals: TTL or 5 V CMOS compatible

POWER
AC voltage: 115 or 230 V ac, ±10%
AC frequency: 50/60 Hz
DC voltages: 5 V dc ±5%, non-isolated; 9-32 V dc, isolated to 300 Vp; 26-56 V dc, isolated to 300 Vp
Power consumption: 3.5 W (nominal)

ENVIRONMENTAL
Operating temperature: 0 to 50°C
Storage temperature: 40 to 75°C
Relative humidity: 95% at 40°C (non-condensing)

MECHANICAL
Dimensions: Newport DIN1A (1/8 DIN) case standard, Newport NEMA case optional (see Mechanical section for drawings)
Case material: 94V-0 UL-rated polycarbonate