DC-POWERED 4 1/2 DIGIT STRAIN / MICROVOLT METER

Low cost, small size, low power consumption at 5 Vdc and exceptional power-supply noise rejection make the 2520-PA ideal for demanding OEM and portable-instrument applications.

MICROVOLT PREAMPLIFIER
The 2520-PA incorporates a preamplifier, which can be programmed for resolution from 1 to 25 µV/count and for zero offset up to ±0.6 mV (RTI) ±21% of full-scale readout (RTO). The 2520-PA can be configured for use with load cells and pressure gauges, which require zero and span adjustment for readout in engineering units. Bridge excitation may be provided by the same 5 Vdc supply that powers the meter, or by an external, isolated 10 or 15 Vdc power supply. The 2520-PA can also be configured as a microvoltmeter using an internal reference, or in a ratiometric mode using an external reference.

SERIAL BCD
Non-isolated, character-serial BCD output is standard to allow the 2520-PA to be interfaced to other instrumentation.

Model 2520-PA provides a differential programmable preamplifier for use with low-level bridge circuits. Bridge excitation can be provided by the same 5 Vdc power supply that powers the meter.

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

SPECIFICATIONS

ANALOG INPUT
Signal range: ±20 mV (Most Sens. Scaling) / ±500 mV (Least Sens. Scaling)
Display range: ±19,999 (Most Sens. Scaling) / ±19,999 (Least Sens. Scaling)
Resolution (µV/count): 1 (Most Sens. Scaling) / 25 (Least Sens. Scaling)
Preamplifier gain: 100 (Most Sens. Scaling) / 4 (Least Sens. Scaling)
Input Configuration: Differential, ratiometric
Coarse-Span Adjustment: Jumper-selectable gain ranges
Fine-Span Adjustment: Front-panel accessible precision potentiometer
Zero Adjustment (RTI or Deadload): ±0.6 mV
Zero Adjustment (RTO or Tare): ±20.9% of full-scale display
Bias Current: 10 nA typ, 20 nA max

NOISE REJECTION
NMR, SIG HI to SIG LO: 60 dB, 50/60 Hz
CMR, SIG GND to SIG LO: 86 dB, dc to 60 Hz
CMV, SIG GND to SIG LO: -1 to +2.5 Vdc
Power Supply Rejection: 86 dB at 50/60 Hz

ACCURACY AT 25°C Error
Max: ±0.01% of reading ±2 counts
Span Tempco, Typ: ±0.003% of reading/°C
Zero Tempco, Typ: ±0.3 µV/°C
Step Response: 2 sec to 99.9% of span
Warmup to Rated Accuracy: 30 min

CONVERSION
Technique: Dual-slope, average-value
Signal Integration Period: 100 msec
Read Rate: 2.5/sec

DIGITAL SIGNALS
Output Signals: TTL-compatible
HOLD Input: TTL or 5 V CMOS compatible
BLANKING Input: Open-collector compatible

POWER
Voltage: +5 to +5.25 Vdc
Current: 170 to 230 mA
Power Consumption: 1 W (nominal)

ENVIRONMENTAL
Operating Temperature: 0 to 55°C (32 to 122°F)
Storage Temperature: -40 to +85°C (-40 to 184°F)
Relative Humidity: 95% at 40°C (104°F) (non-condensing)

MECHANICAL
Dimensions: 24 H x 96 W x 72 mm D (0.94" x 3.77" x 2.82")
Panel Cutout: 22.2 x 92 mm
Weight: 145 g (5 oz)
Case Material: 94 V-0 UL-rated polycarbonate