3 3/4 DIGIT STRAIN METERS WITH BCD OUTPUT
MODEL 204B-LA2 & 204B-LP2 - OPTION AVG/RMS
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 Dummy right-hand
zero NEMA-4 splash-proof
lens coverModels 204B-LA2 and 204B-LP2 are high-quality 3 3/4 digit panel meters for use with pressure transducers, load cells and other bridge transducers which require excitation and preamplification of microvolt signals. Model 204B-LA2 provides a 2 Hz two-pole active filter for superior normal mode noise rejection (NMR) of 90 dB. Model 204B-LP2 provides an analog peak-hold circuit with external reset. It is useful for destructive testing applications. BUILT-IN EXCITATION SUPPLY AND PREAMP The 204B-LA2 and 204-LP2 provide an isolated, constant-voltage excitation supply, which can be field-configured for 5, 10 or 15 V dc output. They also provide a high-impedance, true-differential preamplifier, which is continuously adjustable from 20 to 800 in 3% steps to accommodate load-cell sensitivities of 1 mV/V to 20 mV/V. Fine-gain and fine-deadload adjustments are easily accessible behind the lens. A push-to-cal switch is provided through the lens. The calibration shunt resistor is customer supplied. BRIDGE CONNECTION Bridges can be connected by 4 or 6 wires. In 6-wire connection, two lines sense the voltage applied to the bridge and compensate for lead resistance. DISPLAY RESOLUTION AND ACCURACY Display resolution is one part in 3999 counts, or 0.025% of full scale. Accuracy is up to 99.95%. of reading. The measurement is ratiometric to reduce errors due to temperature and power-line variations. The same internal reference controls the meter gain and the excitation level. SIGNAL OUTPUTS Standard outputs include non-isolated parallel BCD and a strip-chart recorder output of 1 mV/count (nominal). OPTIONS Options are an extra fixed right-hand zero for more flexibility in scaling to engineering units; a splash-proof lens cover, which meets NEMA-4 requirements; and board-edge connectors for the DPM lower board and the LA2 or LP2 signal conditioner upper board. For additional information, please refer to the Options and Mechanical sections. SPECIFICATIONS
Input configuration: Differential, ratiometric Coarse-span adjustment: 125 overlapping ranges with fine adjustment Fine-span adjustment: ±3% of span Zero adjustment: ±3% of bridge output Deadload adjustment, max: Up to 60% of bridge output with external resistor Tare adjustment: ±12 counts nominal Bias current: 11 nA typ, 22 nA max NOISE REJECTION NMR, SIG HI to SIG LO, LA2 option: 90 dB, 50/60 Hz NMR, SIG HI to SIG LO, LP2 option: 60 dB, 50/60 Hz CMR, SIG GND to SIG LO: 80 dB, DC to 60 Hz CMR, SIG GND to PWR GND: 120 dB, 50/60 Hz CMV, SIG GND to PWR GND: 1500 Vp test, 354 Vp per IEC spacing ACCURACY AT 25°C Error, max: ±0.02% of reading ±1 count Zero tempco, max: ±0.3 µV/°C Span tempco: ±0.005% of reading/°C Step response: 1 s to 99.9% of span Warmup to rated accuracy: 60 min CONVERSION Technique: Dual-slope, average-value Signal integration period: 50 ms at 60 Hz, 40 ms at 50 Hz Read rate: 2.5/s EXCITATION Configuration: Constant-voltage Voltage sense: Internal or remote Voltage settings: Jumper-selectable 5, 10, 15 Vdc Load current, max: 125 mA at 5 V, 115 mA at 10 V, 67 mA at 15 V DISPLAY Type: 7-segment, red LED Height: 0.56 in (14.2 mm) Symbols: 8.8.8.8 Decimal points: Three positions programmable internally or at connector Overrange indication: Display flashes DIGITAL SIGNALS Output signals: TTL-compatible HOLD input: TTL or 5 V CMOS compatible BLANKING input: Open-collector compatible POWER AC voltages: 115 Vac ±10% at 60 Hz; 230 Vac ±10% at 50 Hz Power consumption: 8 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 (see Mechanical section for drawings) Weight: 23 oz (650 g) Case material: 94V-0 UL-rated polycarbonate 
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