Functional Description

6B12/HV6B12 The 6B12 and 6B12HV are single-channel isolated signal-conditioning modules which receive millivolt, voltage and process current signals. Unlike conventional signal conditioners, the 6B12 and 6B12HV are complete microcomputer-based data acquisition systems. A major advantage of the on-board microcontroller is its ability to be reconfigured for various sensor types and input ranges.

Synchronized Sampling

The synchronized sampling command allows data to be sampled simultaneously from all 6B11, 6B11HV, 6B12, 6B12HV modules and all 6B50 boards in a 6B Series system. Each module or board stores the data in a separate register within its microcontroller and can access the data with a separate command.

Software Configuration

The 6B12 and 6B12HV digitize millivolt and voltage ranges from ±150 mV to ±50 V as well as 0 to ±20 mA process current inputs. Software is used to configure the 6B12 and 6B12HV modules for address, input range, baud rate, data format, checksum status and integration time. All programmable parameters are stored in the nonvolatile memory of the module.

Inside the 6B12 and 6B12HV

Each analog input signal is conditioned and scaled by a programmable-gain amplifier and digitized by a 16-bit integrating converter under microprocessor control. The digitized value is passed serially across a magnetically isolated barrier (1500 V rms - Model 6B12; 2500 V rms - Model 6B12HV) and clocked in by a custom controller chip. The on-board microprocessor then converts the data into engineering units as determined by the channel parameters. In between conversions, the microprocessor auto zeros the offset and gain by monitoring the on-board temperature and compensating for reference drift. The 6B12 and 6B12HV use compensation factors to ensure the highest accuracy possible.


Figure 1. 6B12 and 6B12HV Functional Block Diagram

6B12/6B12HV MCD

Figure 2. 6B12 and 6B12HV Field Connection Diagram


Millivolt: ±150 mV to ±500 mV

Voltage: ±1 V; ±50 V

Current: ±20 mA


RS-485 Interface

Models 6B12 and 6B12HV

Range Description
(Software Configurable)
±150 mV ±0.03 % FS ±0.06 % FS ±0.02 % FS
±500 mV ±0.01 % FS ±0.04 % FS ±0.008 % FS
±1 V ±0.006 % FS ±0.03 % FS ±0.007 % FS
±5 V ±0.006 % FS ±0.03 % FS ±0.006 % FS
±10 V ±0.006 % FS ±0.03 % FS ±0.005 % FS
±50 V ±0.006 % FS ±0.03 % FS ±0.004 % FS
±20 mA1 ±0.006 % FS2 ±0.03 % FS2 ±0.007 % FS
1 This range requires the use of a 50 Ω current-to-voltage conversion resistor, model AC1381.
2 Does not include the error of the current-to-voltage input resistor, Model AC1381.

6B12 and 6B12HV Specifications
(typical @ +25°C and Vs = +5 V dc)

Description Model 6B12 and 6B12HV
Inputs, Software Selectable
Voltage Ranges
   mV ±150 mV; ±500 mV
   Volt ±1 V; ±5 V; ±10 V; ±50 V
Current Range ±20 mA
Protocol RS-485
Baud Rates, Software Selectable 300K, 600K, 1.2K, 2.4K, 9.6K, 19.2K
Initial @ +25°C Refer to Model Table
Input Offset vs. Temperature ±0.3 µV/°C
Span vs. Temperature ±10 ppm/°C (±50 ppm/°C, maximum)
Input Resistance 1 M Ω
Bandwidth, -3 dB 4 Hz
Conversion Rate 9 samples /second
Synchronized Sampling Command Yes
Conversion Time 70 ms maximum
Common-Mode Voltage (CMV)
Input-to-Output and Power
Model 6B12 1500 V rms, continuous
Model 6B12HV 2500 V rms, continuous
Common-Mode Rejection (CMR)
1 k Ω Source Imbalance @ 50/60 Hz 108 dB
Normal Mode Rejection (NMR)
1 k Ω Source Imbalance @ 50/60 Hz 56 dB
Input Protection 240 V rms, continuous
Input Transient Protection ANSI/IEEE C37.90.1-1989
Power Supply
Voltage, Operating +5 V dc ±5%
Voltage, maximum safe limit +6.5 V dc
Current +100 mA
Mechanical Dimensions 2.3" x 3.1" x 0.79"
(58.4 mm x 78.7 mm x 19.1 mm)
Temperature Range
   Rated Performance -25°C to +85°C
   Operating -25°C to +85°C
   Storage -40°C to +85°C
Relative Humidity 0 to 95% @ +60°C noncondensing
1 When used with the CJC temperature sensor, model AC1361, provided on each channel of 6B Series backplanes.
Specifications subject to change without notice.
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