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Model 2002B-S is a low-cost 4 1/2 digit (±19,999 count) panel meter for indication-only applications that require bridge excitation and resolution down to 1 µV. Zero, span and bridge-balance potentiometers are accessible behind the lens, so that the 2002B-S can be adjusted to read out directly in engineering units for a wide range of bridge inputs or other low-level signals. A ratiometric reference from the bridge excitation eliminates AC line and load regulation errors and reduces overall meter span tempco to 0.01% of reading/°C. Overall meter accuracy is 99.98% at 25°C.
The 2002B-S is housed in a short 4.1 in (104 mm) 1/8 DIN case to fit where space is limited. Power options include isolated 9-32 Vdc and 26-56 Vdc. A splash-proof lens cover which meets NEMA-4 requirements allows the 2002B to be used in harsh industrial environments.
Applications
The 2002B-S is ideal as a digital indicator for pressure cells and metal-foil load cells. It can also be used as a low-level, high-impedance process meter with zero and span adjustments or as a DC voltmeter with resolution down to 1 µV, as required by 50 mV current shunts.
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Bridge Excitation Supply
The excitation supply is transformer-isolated to 500 V ac from the rest of the meter and provides up to 30 mA at 10 Vdc of output current. A multiturn potentiometer accessible behind the lens allows adjustment of output voltage from 10 to 24 Vdc.
Microvolt Preamplifier
The preamplifier provides an input resistance in excess of 1 G without bridge balance. Gains of 1, 10 and 100 are selectable by plug-in jumpers and provide meter resolutions of 100, 10 and 1 µV/count, respectively. Typical offset drift is only 0.3 µV/°C.
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OMEGADYNE™ Load Cells
available from NEWPORT®
CLICK HERE FOR SELECTION GUIDE
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SPECIFICATIONS
ANALOG INPUT
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Range |
±20 mV |
±200 mV |
±2 V |
Resolution |
1 µV/count |
10 µV/count |
100 µV/count |
Preamplifier Gain |
100 |
10 |
1 |
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Input resistance: 1 Gohm without bridge balance
Bias current: 1 nA typ, 5 nA max
Gain attenuator: Adjustable from 0.001 to 1
Bridge-balance range: ±1.5 mV with 350 bridge
Zero-adjustment range: -19,999 to +19,999 counts
Span-adjustment range: 0 to 19,999 counts
REFERENCE
Configuration: Differential, ratiometric
Internal from excitation supply: 1.0 V with 9.5 kohm source resistance at 10 V excitation
External, optional: 1.0 V -50%/+100% with 680 kohm input resistance
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ACCURACY AT 25°C
Maximum Error: ±0.01% of span ±2 counts
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REFERENCE |
INTERNAL |
EXTERNAL |
Bridge-Balance Tempco |
±0.5 µV/°C |
±1.0 µV/°C |
Zero Tempco |
±0.5 counts/°C |
±1.0 count/°C |
Span Tempco |
±0.005% of span/°C |
±0.01% of span/°C |
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Full-scale step response: 1 s
Warmup to rated accuracy: 10 min
NOISE REJECTION
NMR, SIG HI to SIG LO: 80 dB at 50/60 Hz for 20 mV range, 66 dB at 50/60 Hz for 200 mV and 2 V ranges
CMR, SIG GND to PWR GND: 120 dB, DC to 60 Hz
CMV, SIG GND to PWR GND: 1500 Vp per HV test, 354 Vp per IEC spacing
ANALOG-TO-DIGITAL CONVERSION
Technique: Dual-slope, average-value
Signal integration period: 100 ms
Read rate: 2.5/s
BRIDGE EXCITATION SUPPLY
Output voltage: Adjustable from 10 to 24 Vdc
Output current: 30 mA max at 10 Vdc decreasing to 12 mA max at 24 Vdc
Line regulation*: 0.01% typ, ±0.04% max for 10% change of AC power voltage
Load regulation*: ±0.15% typ, ±0.5% max from zero to max load
Ripple at 50/60 Hz: ±0.01%
Tempco: ±0.02%/°C
*The internal reference is derived from the excitation voltage for ratiometric operation. This eliminates load and line regulation errors and reduces other errors as indicated under accuracy at 25°C.
DISPLAY
Type: 7-segment, red LED
Height: 0.56 in (14.2 mm)
Symbols: -1.8.8.8.8
Decimal points: Four positions programmable by jumpers behind lens or at connector, sink 10 mA to SIG GND
Overrange indication: Four least-significant digits flash
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DIGITAL SIGNALS
Input signals: Display hold, blanking, display test, decimal point select
Level, Input signals: TTL or 5 V CMOS compatible
POWER
AC voltages: 115 or 230 Vac ±15%
AC frequency: 49-440 Hz
DC voltages: 9-32 Vdc, isolated to 300 Vp; 26-56 Vdc, isolated to 300 Vp
Power consumption: 4.0 W nominal
Output Voltages: +4.7 Vdc and -4.7 Vdc ±5%, 10 mA max
ENVIRONMENTAL
Operating temperature: 0 to 60°C
Storage temperature: -40 to +85°C
Relative humidity: 95% at 45°C (non-condensing)
MECHANICAL
Dimensions: Newport DIN2A (1/8 DIN) case (see Mechanical section for drawings)
Weight: 15 oz (425 g)
Case material: 94V-0 UL-rated polycarbonate
Connector for signal, power and excitation: Screw-terminal barrier strip (standard)
Connector for display control lines: 36-pin PCB edge connector (optional)
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† All dollar amounts on this site are shown in US currency.
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Part Number Builder |
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Option Descriptions
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(1)
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Model
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Select
2002B for Standard Model
3002 for Model with INFINITY® Style Bezel and Adapter
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(2)
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INPUT CONFIGURATION
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Select
-S for Strain/Microvolt Meter with Excitation Output
-P for Process Receiver
-E for Process Receiver with Excitation Output
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(3)
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POWER
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Select
Nothing(leave field blank) for 115 Vac, 50/60 Hz
,C1 for 230 Vac, 50/60 Hz
,C3C for Isolated 9-32 Vdc
,C3E for Isolated 26-56 Vdc
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(4)
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DISPLAY OPTION
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Select
Nothing(leave field blank) for Red LED display
,G for Green LEDs for Display
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(5)
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ADD-ON OPTIONS
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Select
Nothing(leave field blank) for No Options
,BL for Lens without Newport logo
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(6)
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ADD-ON OPTIONS
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Select
Nothing(leave field blank) for No Options
,FS for Custom calibration for models 2002B-S/3002-S. Specify in millivolts for min/max input, min/max display, and excitation of 10-24 Vdc. $25
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| NOTE: All combinations may not be valid, check spec sheet for valid part numbers. |
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Keywords: 4 1/2 Digit Strain / Microvoltmeter
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