Model 201A/201AN - 3 1/2 Digit DC Voltmeters

LOW-COST, 3 1/2 DIGIT DC VOLTMETERS
MODEL 201A & 201AN - OPTION 201AN-AC / 301AN

NEMA-SIZE Case

Connections Diagram

STANDARD FEATURES
±1,999-count display span
±200 mV to ±200 Vdc ranges
True-differential input with 80 dB CMR
3-wire ratio input
Bright, 0.56 in (14.2 mm) LED display
Automatic zero and polarity
Display hold and test
115/230 Vac power
1/8 DIN case

OPTIONS
Isolated 9-32 Vdc power
Isolated 26-56 Vdc power
Screw-terminal barrier strip
NEMA-4 splash-proof lens cover

Models 201A and 201AN are two pinout versions of the same low-cost 3 1/2 digit DC voltmeter. They fit a standard 1/8 DIN panel cutout and require a depth of less than 4.1 in (104 mm) behind the panel. With the addition of a screw-terminal barrier strip, they become low-cost, pin-compatible alternatives to the Q2000A and Q2000B in applications where indication-only is required.

INPUT RANGES
The 201A and 201AN offer voltage ranges of ±0.1999 V, ±1.999 V, ±19.99 V and ±199.9 V dc. The input is true-differential, with excellent common-mode noise rejection (CMR). By using an external DC voltage reference, any of these ranges can further be configured for 3-wire ratio measurement with readout from 0 to 1.999.

TWO PINOUTS
Model 201A is pin-compatible with Newport's older Model 201 and is recommended for existing 201 applications.

Model 201AN is pin-compatible with Newport's new 202A, 2001A, 2002A Series and is recommended for new applications.

OPTIONS
The 201A and 201AN can be configured for four voltage input ranges, three decimal-point positions, and high- impedance 3-wire ratio input. Mechanical options include a screw-terminal barrier strip for signal and power and a splash-proof lens cover which meets NEMA-4 standards.

SPECIFICATIONS

ANALOG 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	130 Vp	130 Vp	250 Vp	250 Vp
Input Resistance	1 Gohm	1 Gohm	1.1 Mohm	1.0 Mohm
Bias Current	50 pA	50 pA	5 pA	1 pA

Configuration: Differential, Bipolar
Zero: Automatic
Span Adjustment: ±5%

NOISE REJECTION
NMR: 56 dB, 50/60 Hz
CMR, AC GND to SIG GND: 120 dB, DC to 60 Hz
CMR, SIG LO to SIG GND: 80 dB, DC to 60 Hz
CMV, AC GND to SIG GND: 1500 Vp per HV test, 354 Vp per IEC spacing
CMV, SIG LO to SIG GND: ±1 Vp

ACCURACY AT 25°C
Maximum error: ±0.05% of reading ±1 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: 100 ms

3-WIRE RATIO REFERENCE

Analog input range	±200 mV	±2, ±20, ±200 V
External refernce input	+0.05 to +0.2V	+0.5 to +2.0 V
Load on reference, std	30.6 kohm	65.3 kohm
Load on reference, opt	100 Mohm	100 Mohm
Accuracy	99.9%	99.9%

DISPLAY
Type: 7-segment, red LED
Height: 0.56 in (14.2 mm)
Symbols: 1.8.8.8
Decimal points: Three positions programmable internally or at connector
Overrange indication: Three least-significant digits blank

DIGITAL SIGNALS
HOLD and TEST inputs: TTL or 5 V CMOS compatible

POWER
AC voltage: 115 or 230 Vac, ±15%
AC frequency: 49-440 Hz
DC voltages: 9-32 Vdc, isolated to 300 Vp; 26-56 Vdc, isolated to 300 Vp
Power consumption: 2.4 W (nominal)
Output voltages: +4.7 Vdc and 4.6 Vdc ±5%, 10 mA max

ENVIRONMENTAL
Operating temperature: 0 to 60°C
Storage temperature: 40 to 85°C
Relative humidity: 95% at 40°C (non-condensing)

MECHANICAL
Dimensions: Newport DIN2A (short 1/8 DIN) case (see Mechanical section for drawings)
Weight: 14 oz (400 g)
Case material: 94V-0 UL-rated polycarbonate