MODEL 204B-LA2/204B-LP2 - 3 3/4 Digit Strain Meters with BCD Output

3 3/4 DIGIT STRAIN METERS WITH BCD OUTPUT
MODEL 204B-LA2 & 204B-LP2
OPTION AVG/RMS

NEWPORT PRODUCT INFO

• MANUAL - PDF Version
• MECHANICAL 1/8 DIN (1A) Case
• MECHANICAL NEMA-SIZE Case (optional)
• MECHANICAL Connections Diagram
• PRICE

•

REQUIRES ADOBE ACROBAT - HELP

STANDARD FEATURES
	480 to +3,999-count display span
	True-differential preamplifier
	Isolated 5, 10, 15 Vdc excitation supply
	2 Hz low-pass active filter, LA2 version
	Peak-hold with external reset, LP2 version
	1500 Vp CMV, 120 dB CMR
	Parallel BCD output
	1 mV/count analog output
	Bright, 0.56 in (14.2 mm) LED display
	115/230 Vac power
	1/8 DIN case

OPTIONS
	Dummy right-hand zero
	NEMA-4 splash-proof lens cover

Models 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.

OMEGADYNE™ Load Cells
available from NEWPORT®
CLICK HERE FOR SELECTION GUIDE

SPECIFICATIONS

ANALOG INPUT	Most-sensitive scaling	Least-sensitive scaling
Signal Range	0.6 to +5 mV	20 to +200 mV
Display Range	480 to +3999	480 to +3999
Resolution	1.25 µV/count	50 µV/count
Preamplifier Gain	800	20

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