Models 2004-LA1 and 2004-LP1 are high-resolution, high-accuracy 4 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 2004-LA1 provides an extra 2 Hz two-pole active filter for exceptional normal mode noise rejection (NMR) of 110 dB. Model 2004-LP1 provides an analog peak-hold circuit with external reset. It is ideal for destructive testing applications. EXCITATION SUPPLY AND PREAMPLIFIER The 2004-LA1 and 2004-LP1 provide a constant-voltage excitation supply which can be field-configured for 5, 10 or 15 Vdc output. They also provide a high-impedance, true-differential preamplifier, which is continuously adjustable from 20 to 100 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. RESOLUTION AND ACCURACY Resolution is one part in 39,999 counts, or 0.0025% of full scale. Accuracy is up to 99.985%. of reading. The measure-ment 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 include board-edge connectors and a splash-proof lens cover which meets NEMA-4 requirements. For additional information, please refer to the Options and Mechanical sections. SPECIFICATIONS
Input configuration: Differential, ratiometric Coarse-span adjustment: 57 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: ±4 counts nominal Bias current: 11 nA typ, 22 nA max 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 NOISE REJECTION NMR, SIG HI to SIG LO, LA1 option: 110 dB, 50/60 Hz NMR, SIG HI to SIG LO, LP1 option: 80 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: ±0.01% of reading ±2 counts Zero tempco: ±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: 33 ms at 60 Hz, 40 ms at 50 Hz Read rate: 3.3/s at 60 Hz, 2.8/s at 50 Hz DISPLAY Type: 7-segment, red LED Height: 0.56 in (14.2 mm) Symbols: 8.8.8.8.8 Decimal points: Four 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 HOME / PRODUCT GUIDE / TECHNICAL REFERENCE NEWPORT Electronics, Inc. (714) 540-4914 or Contact Us Copyright 1999, Newport Electronics, Inc. All rights reserved. |