Model 202A-S is a low-cost 3 1/2 digit panel meter in a short 4.1 in (104 mm deep) 1/8 DIN case for applications that require bridge excitation and resolution down to 10 microvolts. Zero, span and bridge-balance adjustments are accessible behind the lens, so that the 202A-S can read out directly in engineering units for a wide range of bridge inputs or other low-level signals. APPLICATIONS Model 202A-S is primarily intended as a digital indicator for pressure cells and metal-foil load cells. It can also be used as a low-level, high-impedance process meter with zero and span adjustments, or as a DC voltmeter with resolution down to 10 microvolts, required by 50 mV current shunts. RESOLUTION AND ACCURACY Resolution is 1 part in ±1,999 counts, or 0.05% of full scale. Accuracy is 99.9%. A ratiometric reference input eliminates AC line and load regulation errors and reduces overall meter span tempco to 0.01% of reading/°C. BRIDGE EXCITATION SUPPLY The built-in excitation supply of the 202A-S is transformer-isolated to 500 Vac from the rest of the meter. A multiturn potentiometer accessible behind the lens allows adjustment of the output voltage from 10 to 24 Vdc. Maximum output current is 30 mA.
SPECIFICATIONS
Configuration: Differential, ratiometric Polarity: Bipolar Input resistance: 1 G Bias current: 1 nA typ, 5.5 nA max Maximum voltage: 50 V Coarse preamplifier gains: 1, 10, 100 Gain attenuator: Adjustable from 0.001 to 1 Bridge-balance range: ±50% of bridge span Zero-adjustment range: -1,000 to +1,000 counts Span-adjustment range: 0 to 2,000 counts NOISE REJECTION NMR, SIG HI to SIG LO: 70 dB, 50/60 Hz CMR, SIG GND to SIG HI: 120 dB at gain 100, DC to 60 Hz CMV, SIG GND to SIG HI or LO: +2.5 Vdc CMR, SIG GND to PWR GND: 120 dB, DC to 60 Hz CMV, SIG GND to PWR GND: 1500 Vp test, 354 Vp per IEC spacing ACCURACY AT 25°C Error, max: ±0.05% of reading ±1 count Balance tempco: ±0.3 µV/°C typ, ±1.0 µV/°C max Zero tempco: ±0.01% of zero/°C Span tempco, ratiometric: ±0.03% of reading/°C Span tempco, non-ratiometric: ±0.3 µV/°C Full-scale step response: 1.0 s Warmup to rated accuracy: 10 min ANALOG-TO-DIGITAL CONVERSION Technique: Dual-slope, average-value Signal integration period: 100 ms Read rate: 2.5/s BRIDGE EXCITATION SUPPLY Output voltage: Adjustable 10 to 24 Vdc Output current: 30 mA at 10 Vdc decreasing to 12 mA at 24 Vdc Line regulation: ±0.01%/V of AC power Load regulation: ±0.5% Ripple at 50/60 Hz: ±0.01% Tempco: ±0.02%/°C Reference signal: 1.0 V typ at 10 V output (Eliminates line and load regulation errors and reduces overall meter span tempco to ±0.01%/°C) DISPLAY Display Type: 7-segment, red LED Display Height: 0.56 in (14.2 mm) Symbols: 1.8.8.8 Decimal points: Three positions, programmable by jumpers behind lens or at connector, 10 mA sink Overrange indication: Three least-significant digits blanked DIGITAL INPUTS Level: TTL or 5 V CMOS compatible POWER AC voltages: 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: 3.7 W max Output Voltages: +4.7 Vdc and 4.7 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 (1/8 DIN) case (see Mechanical section for drawings) Weight: 15 oz (425 g) Case material: 94V-0 UL-rated polycarbonate Connector for signal and power: D4 screw-terminal barrier strip (standard) Connector for control lines: D1 36-pin PCB edge connector (optional) |
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