3B42/3B43/3B44 Isolated AC Sine Wave Input

The 3B42, 3B43 and 3B44 are single-channel AC sine wave signal conditioning modules which use an AC averaging technique to rectify, amplify, and filter 50 Hz to 400 Hz sine-wave signals ranging from 20 mV to 550 V rms to give an rms output reading. Simultaneous precision voltage and current outputs are provided. including isolation (±1500 V peak input-to-output and power). The 3B42 and 3B43 modules withstand 220 V rms, and Model 3B44 withstands 550 V rms at its input terminals without damage, thereby shielding computer-side circuitry from field-side overvoltage conditions. Each plug-in, mix-and-match, hot-swappable module is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs.

3B Series Custom-Ranging Program

Externally-programmable versions, Models 3B42-00, 3B43-00 and 3B44-00, enable the user to configure a special input range by using the optional plug-on AC1310 ranging card, which houses user-supplied resistors to determine zero and span. To facilitate selecting resistors, a Windows^® program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges.

Inside the 3B42, 3B43 and 3B44 Modules

Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. The differential input circuit on the field side is fully floating, eliminating the need for any input grounding. A demodulator on the computer side of the signal transformer recovers the original signal, which is then filtered and buffered to provide a low-noise, low-impedance output signal.

Figure 1. 3B42, 3B43, and 3B44 Functional Block Diagram

Figure 2. 3B42, 3B43, and 3B44 Input Field Connections

Input Type	Dual Outputs
3B42: 20 V rms to 1 V rms	0 to +10 V
3B43: 1 V rms to 50 V rms	4 mA to20 mA or 0 to 20 mA
3B44: 50 V rms to 550 V rms

	Model	Input Range	Output Ranges1
Order Now	3B42-00	Externally Programmable2	0 V to +10 V & 0 mA to 20 mA
Order Now	3B42-01	0 mV to +50 mV rms	0 V to +10 V & 0 mA to 20 mA
Order Now	3B42-02	0 mV to +100 mV rms	0 V to +10 V & 0 mA to 20 mA
	3B42-Custom	*	*
Order Now	3B43-00	Externally Programmable2	0 V to +10 V & 0 mA to 20 mA
Order Now	3B43-01	0 V to +10 V rms	0 V to +10 V & 0 mA to 20 mA
	3B43-Custom		*
Order Now	3B44-00	Externally Programmable2	0 V to +10 V & 0 mA to 20 mA
Order Now	3B44--01	0 V to +150 V rms	0 V to +10 V & 0 mA to 20 mA
Order Now	3B44-02	0 V to +250 V rms	0 V to +10 V & 0 mA to 20 mA
	3B44-Custom	*	*

¹ Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.
² Requires AC1310 ranging card.

* Custom Input/Output ranges are available. Refer to the Configuration Guide.

(typical @ +25°C and ±15 V dc, and +24 V dc Power)

Description	Model 3B42	Model 3B43	Model 3B44
Input Ranges
Standard Ranges, 50 Hz to 400 Hz	Refer to Model Table	Refer to Model Table	Refer to Model Table
Custom Ranges, 50 Hz to 400 Hz	20 mV rms to 1 V rms	1 V rms to 50 V rms	50 V rms to 550 V rms
Output Ranges
Voltage (RL > 2 kΩ)	0 V to +10 V	*	*
Current (RL = 0 to 850 Ω)1	4 mA to 20 mA or 0 mA to 20 mA	*	*
Accuracy2
Initial @ +25°C	±0.05% Span	*	*
Nonlinearity2	±0.02% Span	*	*
Stability vs. Temperature
Voltage Output
Zero	±0.005% of Span/°C	*	*
Span	±25 ppm of Reading/°C	*
Current Output3
Zero	±25 ppm of Span/°C	*	*
Span	±25 ppm of Reading/°C	*	*
Zero and Span Adjustment Range4	±5% of Span	*
Input Bias Current	+1 nA	+5 nA	+3 nA
Input Resistance	100 MΩ	250 kΩ	1 MΩ
Noise
Input, 0.1 Hz to 10 Hz Bandwidth	5 µV rms	*	*
Output, Ripple and Noise	50 µV rms	*	*
Bandwidth, -3 dB	3 Hz	*	*
Output Rise Time, 10% to 90% Span	200 ms	*	*
Common Mode Voltage (CMV)
Input-to-Output, Continuous	±1500 V peak, maximum	*	*
Transient	ANSI/IEEE C37.90.1-1989	*	*
Common Mode Rejection (CMR)
1 kΩ Source Imbalance, 50/60 Hz	100 dB	*	*
Input Protection
Continuous	220 V rms, maximum	*	550 V rms, continous
Transient	ANSI/IEEE C37.90.1-1989	*	*
Voltage Output Protection	Continuous Short to Ground	*	*
Current Output Protection	130 V rms, continuous	*	*
Power Supply Voltages5
±15 V dc Supplies
Rated Operation	±(11.5 V dc to 16.5 V dc)	*	*
Current	±10 mA	*	*
Sensitivity	±0.01% span/V	*	*
+24 V dc Loop Supply
Rated Operation	+12 V dc to +30 V dc	*	*
Current	+27 mA @ lout = 20 mA	*	*
Sensitivity	±0.0002% span/V	*	*
Mechanical Dimensions	3.15" x 3.395" x 0.775" (80.0 mm x 86.2 mm x 19.7 mm)	*	*
Environmental
Temperature Range
Rated Performance	-25°C to +85°C	*	*
Storage	-55°C to +85°C	*	*
Relative Humidity, 24 hours	0 to 95% @ +60°C noncondensing	*	*
RFI Susceptibility	±0.5% Span error @ 400 MHz, 5 Watt, 3 ft	*	*

* Specifications same as model 3B42.
¹ For a 0 to 20 mA range, a typical minimum output current is 10 µA.
² Includes the combined effects of repeatability, hysteresis, and nonlinearity.
³ With respect to the voltage output.
⁴ A wide range of custom zero suppression and span is available with Models 3B42-00, 3B43-00 and 3B44-00, using the AC1310 ranging card.
⁵ +24 V dc loop power is required for driving the current output at loads up to 850Ω. If a current output load of 400Ω or less is applied, +15 V dc is sufficient for loop power. If only voltage output is used, loop power is not required.