Impulse 8B33 User Manual
SensorLex® 8B Isolated Analog Signal Conditioning Products
8B33
Isolated True RMS Input Modules
Description
Each 8B33 True RMS input module provides a single channel of AC input which
is converted to its True RMS DC value, filtered, isolated, amplified, and
converted to a standard process voltage or current output (Figure 1).
The field voltage or current input signal is processed through a pre-amplifier and
RMS converter on the field side of the isolation barrier. The converted DC signal
is then chopped by a proprietary chopper circuit and transferred across the
transformer isolation barrier, suppressing transmission of common mode
spikes and surges. The computer side circuitry reconstructs, filters, and
converts the signal to an industry standard output of 0 to 5VDC.
Special input circuits provide protection against accidental connection of power
line voltages up to 350VAC and against transient events defined by ANSI/IEEE
C37.90.1.
8B
Features
• Interfaces to RMS Voltage (0-300V) or RMS
Current (0-1A)
• Designed for Standard Operation with
Frequencies of 45Hz to 1000Hz (Extended
Range to 10kHz)
• Compatible with Standard Current and
Potential Transformers
• Industry Standard Output of 0 to 5VDC
• ±0.25% Factory Calibrated Accuracy
• 1500Vrms Transformer Isolation
• Input Overload Protected to 350Vrms Max
(Peak AC & DC) or 2Arms Continuous
• ANSI/IEEE C37.90.1 Transient Protection
• CE Compliant
• Hazardous Location Certifications Pending
Figure 1: 8B33 Block Diagram
108
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SensorLex® 8B Isolated Analog Signal Conditioning Products
8B
Specifications
Module
Input
Signal Range 100mV to 300Vrms, 0 to 1Arms
Standard Frequency Range 45Hz to 1000Hz
Extended Frequency Range 1kHz to 10kHz
Impedance 499KΩ (-01, -02)
Coupling AC
Protection
Output
Signal Range 0V to 5V
Voltage Limit ±9V
Protection Continuous Short to Ground
Ripple and Noise 0.0375% Span rms
Accuracy (10-100% Span)
Sinusoid
Non-Sinusoid
Vs. Temperature ±100ppm/ºC
Isolation (Common Mode)
Input to Output, Input to Power
Continuous 1500Vrms max
Transient ANSI/IEEE C37.90.1
(1)
Continuous (-01 thru -05) 350Vrms
Continuous (-06) 2Arms
Transient (-01 thru -05) ANSI/IEEE C37.90.1
Transient (-06) See note 2
50/60Hz ±0.25% Span
45Hz to 1kHz ±0.625% Span
1kHz to 10kHz ±1.375% Span, ±3.25% Span(-06)
Crest Factor = 1 ±0.25% Span
Crest Factor = 2 ±0.325% Span
Crest Factor = 3 ±0.475% Span
Crest Factor = 4 ±0.7% Span
Typical at TA=+25°C and +5V power
8B33
1MΩ (-03, -04, -05)
.05Ω (-06)
(3) (4)
Ordering Information
Model Input Range Output Range
8B33-01 0mV to 100mV 0V to +5V
8B33-02 0V to 1V 0V to +5V
8B33-03 0V to 10V 0V to +5V
8B33-04 0V to 100V 0V to +5V
8B33-05 0V to 300V 0V to +5V
8B33-06 0A to 1A 0V to +5V
8B
CMR (50Hz to 60Hz) 120dB
NMR 70dB at 60Hz
Response Time, 90% Span <120mS
Supply Voltage +5VDC ±5%
Current 30mA
Sensitivity ±200ppm/%
Environmental
Operating Temperature Range –40ºC to +85ºC
Storage Temperature Range –40ºC to +85ºC
Relative Humidity 0 to 90% Noncondensing
Emissions EN61000-6-4 ISM, Group 1
Radiated, Conducted Class A
Immunity EN61000-6-2 ISM, Group 1
RF Performance A ±0.5% Span Error
ESD, EFT, Surge, Voltage Dips Performance B
Dimensions 1.11" x 1.65" x 0.40"
NOTES:
(1) 8B33 and 8BP01, 8BP02, 8BP04, 8BP08, 8BP16, XEV rating only. Backpanels obtained from
other sources may have lower ratings.
(2) For 1 to 25 seconds the max allowable transient current rating is √2500/(event time). For less
than 1 second, ANSI/IEEE C37.90.1 applies with a 0.05
2 Arms continous rating applies.
(3) At standard 60Hz factory calibration. Consult factory for calibration at other frequencies.
(4) For 0-10% Span measurements, add 0.25% accuracy error (-02 through -07) or 1.00% accuracy
error (-01). Accuracy includes linearity, hysteresis and repeatability but not source or external
shunt inaccuracy (if used).
(28.1mm x 41.9mm x 10.2mm)
Ω load. For greater than 25 seconds, the
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