Omega Products DP3520-PA User Manual

4½ DIGIT DC-POWERED
STRAIN/MICROVOLTMETER

DP3520-PA

U ±19,999 Count Display Span
U True-Differential Input
U 3-Wire Ratio Measurement
U Serial BCD Output
U Bright, 14 mm (0.56") LED Display
U Automatic Zero and Polarity
U Display Hold and Test
U 5 Vdc Power
U Low-Profile ¹⁄₁₆ DIN Case

The DP3520-PA is an economical 5-volt powered,
high-resolution, high-accuracy 4½ digit dc
microvoltmeter in a compact ¹⁄₁₆ DIN case. The height
of the panel cutout is 22 mm (0.88"), and the depth
required behind the panel is only 72 mm (2.83").

Low cost, small size, low power consumption at
5 Vdc and exceptional power-supply noise rejection
make the DP3520-PA ideal for demanding OEM and
portable-instrument applications.

MICROVOLT PREAMPLIFIER

The DP3520-PA incorporates a preamplifier, which
can be programmed for resolution from 1 to 25 µV/
count and for a zero offset up to ±0.6 mV (RTI) ±21%
of full-scale readout (RTO).

The DP3520-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 DP3520-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 DP3520-PA to be interfaced to other
instrumentation.

Model DP3520-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.

SPECIFICATIONS

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

Conversion

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

Analog Input

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

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

Digital Signals

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

D-1

DP3520-PA shown

actual size.

INSTRUMENTATION

D

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 (0.874 x

3.622")

Weight: 145 g (5 oz)
Case Material: 94 V-0 UL-rated

polycarbonate

+5V dc Power

Power Return

Sig Hi

Sig Lo

PA Option

Input Zero Adj.

Output Offset Adj.

Coarse Gain Adj.

Main Assembly

with Display

Fine Gain Adj.

Analog Input

SIGNAL RANGE DISPLAY RANGE RESOLUTION PREAMPLIFIER GAIN

Most Sensitive Scaling

Least Sensitive Scaling

±20 mV ±19,999 1 µV/count 100

±500 mV ±19,999 25 µV/count 4

To Order Visit omega.com/dp3520-pa for Pricing and Details

MODEL NO. DESCRIPTION

DP3520-PA

*

-UC

*

-LT

NOTE: All combinations may not be valid, check online for valid part numbers.
Ordering Examples: DP3520-PA, for 4½ digit dc strain/micro voltmeter, 5 vdc powered.

½ digit DC powered strain/microvoltmeter

4

(Nothing, leave field blank) spring clamp case mounting

U-shaped mounting clamp

(Nothing, leave field blank) standard (±0.005% of reading/°C) span tempco

High-stability (±0.001% of reading/°C) span tempco

*

(Nothing, leave field blank) red LED display

-G

Green LED display

D-2

Display HOLD
& Decimal Point

Character-Serial
BCD Output (std.)