ANALOG DEVICES 5B30, 5B31 Service Manual

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Millivolt and Voltage Input

5B30/5B31

	FEATURES
	Isolated Voltage Input.
	Amplifies, Protects, Filters, & Isolates Analog Input Voltages.
	Protect the computer side from damage due to field-side
	overvoltage faults.
	A Series output switch eliminates the need for external
	multiplexing in many applications.
	Module circuitry can withstand 240v rms at the input screw-
	terminals.
	All 5B30 & 5B31 series modules are mix-and-match and Hot	Figure 1. 5B30/5B31 Functional Block Diagram
	Swappable.
		There are also a number of backplanes and mounting sockets
	APPLICATIONS	which provide a complete signal conditioning solution for end
		users. Each backplane incorporates screw terminals for field
	Industrial signal conditioning
		wiring inputs and outputs and cold junction sensors for
	Industrial signal isolation
		thermocouple applications.
	Industrial signal filtering
		These signal conditioners are designed to provide an easy and
		convenient solution to signal conditioning problems of both
	PRODUCT OVERVIEW	designers and end users in measurement and control
		ppli ations. Typical u es include microcomputerased
	The 5B Series represents an innovative generation of low cost,	measurement sy tem , tandard data acquisition systems,
	high performance plug-in signal conditioners. Designed for	programmable controller , analog recorders and dedicated
	industrial applications, these modules incorporateMacshbMhighly control systems. The 5 B series modules are ideally suited to
	reliable transformer-based isolation and automated surface-	applications where monitoring and control of temperature,
	mount manufacturing technology. They are compact,	pressure, flow, rotation and other analog signals are required.
	economical components whose performance exceeds that	The 5B Series modules and backplanes are approved by Factory
	available from more expensive devices. Combining 1500 V rms
		Mutual (FM) and the 5B Series modules are approved by the
	continuous isolation, +0.05% calibrated accuracy, small size and
		Canadian Standards Association (CSA) for use in Class 1,
	low cost, the 5B Series is an attractive alternative to expensive
		Division 2, Groups A, B, C, and D locations. These approvals
	signal conditioners and in-house designs
		certify that the 5B Series is suitable for use in locations where a
	All modules are potted and identical in pin-out and size (2.27” x	hazardous concentration of flammable gas may exist only under
	2.32” x 0.595”). They can be mixed and matched, permitting	fault conditions of operation. Equipment of this category is
	users to address their exact needs, and may be “hot swapped	called “non-incendive” and they need no special enclosures or
	without disturbing field wiring or power. The isolated input	other physical safeguards.
	modules provide 0 to +5V or +5V outputs and accept J, K, T, E,	The 5B series modules and backplanes have been tested and
	R, S, N, or B type thermocouples.
		passed the stringent heavy industrial requirements of the
	These modules feature complete signal conditioning functions	European Union’s electromagnetic compatibility (ENC)
	including 240 V rms input protection, filtering, chopper	directive – EN50082-1 and EN50081-2. When used according
	stabilized low drift +1 uV/oC amplification, 1500 V rms	to installation directions (refer to 5B series User Manual), any
	isolation, and sensor excitation when required.	errors caused by EMI/RFI interference will be less than 0.1% of
		the full scale 5B measurement range for field strengths up to 10

	All modules feature excellent common mode rejection and	V/M and frequencies up to 1 GHz.
	meet industrial transient surge withstand specifications.

FUNCTIONAL BLOCK DIAGRAM

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5B30 / 5B31

GENERAL DESCRIPTION

The 5B30 and 5B31 are single-channel signal conditioning modules that amplify, protect, filter and isolate analog input voltages.

The 5B30 and 5B31 protect the computer side from damage due to field-side over voltage faults. All models withstand 240V rms at their input terminals without damage thereby shielding computer side circuitry from field-side over voltage conditions. In addition, 5B30 and 5B31 Series modules are mix-and-match and hot swappable, so can be inserted or removed from any socket in the same backplane without disrupting system power.

A chopper-stabilized input amplifier provides low drift and stable gain. At the amplifier input, a stable, laser-trimmed zeroscale input voltage is subtracted from the input signal to set the zero scale value. For user convenience, the zero can be optionally factory-set to meet custom needs. This allows suppression of a zero-scale input value many times larger that the total span for precise expanded-scale measurements.

Internal multi-pole low-pass filtering with a four-Hz cutoff (- 3dB) enhances normal-mode (noise on signal) and common-

mode (nosie on signal return) rejection at 50/60 Hz, enabling accurate measurement of small signals in high electrical noise.

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. The output common must be kept within +3 V of power common.

A series output switch eliminates the need for external multiplexing in many applications. The switch is turned on by an active-low enable input. If the switch is to be on at all times, the enable-input should be grounded to power common as it is on the 5B01 and 5B08 backplanes.

MacshbM.

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5B30 / 5B31

5B30 / 5B31—SPECIFICATIONS

5B30 and 5B31 Models Available
Model	Input Range		Output Range
5B30-01	-10 mV to	+10 mV	-5 V to +5 V
5B30-02	-50 mV to	+50 mV	-5 V to +5 V
5B30-03	-100 mV to	+100 mV	-5 V to +5 V
5B30-04	-10 mV to	+10 mV	0 V to +5 V
5B30-05	-50 mV to	+50 mV	0 V to +5 V
5B30-06	-100 mV to	+100 mV	0 V to +5 V
5B30-Custom	*		*
Model	Input Range		Output Range
5B31-01	-1 V to	+1 V	-5 V to +5 V
5B31-02	-5 V to	+5 V	-5 V to +5 V
5B31-03	-10 V to	+10 V	-5 V to +5 V
5B31-04	-1 V to	+1 V	0 V to +5 V
5B31-05	-5 V to	+5 V	0 V to +5 V
5B31-06	-10 V to	+10 V	0 V to +5 V
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5B31-07	-20 V to	+20 V	-5 V to +5 V
5B31-Custom	*		*
*Custom Input/Output ranges are available. Refer to configuration guide.
5B30 and 5B31 Specifications
Description		Model 5B30	Model 5B31
		Input Ranges
Standard Ranges	±10 mV to ±100 mV		±1 V to ±20 V
Custom Ranges	±5 mV to ±500 mV		±0.5 V to ±20 V
Output Ranges (RL > 50 kΩ)4	-5 V to +5 V or 0 V to +5 V		*
		Accuracy2
Initial @ +25°C	±0.05% Span ±10 µV RTI ±0.05% (Vz1)		±0.05% Span ±0.2 mV RTI ±0.05% (Vz1)
Nonlinearity	±0.02% Span		*
Input Offset vs. Temperature	±1 µV/°C		±20 µV/°C
Output Offset vs. Temperature	±20 µV/°C		*
Gain vs. Temperature	±25 ppm of Reading/°C		±50 ppm of Reading/°C
Input Bias Current	±3 nA		±0.2 nA
		Input Resistance
Power On	5 MΩ		650 kΩ
Power Off	40 kΩ		650 kΩ

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