6B12/6B12HV Isolated, Field Configurable Analog Input


6b12hv6b12The 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.

Inputs and Communications


Figure 1. 6B12/6B12HV Functional Block Diagram


Figure 2. 6B12 and 6B12HV Field Connection Diagram

Millivolt: ±150 mV to ±500 mV
Voltage: ±1 V; ±50 V
Current: ±20 mA

Available Models

 Range Description
(Software Configurable)
(Peak to Peak)
±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 

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)

Model 6B12 and 6B12HV 
Inputs, Software Selectable
Voltage Ranges
±15 mV to ±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 MΩ
 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 kΩ Source Imbalance @ 50/60 Hz
108 dB
 Normal Mode Rejection (NMR)
1 kΩ 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
+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
-25°C to +85°C 
-40°C to +85°C
Relative Humidity  0 to 95% @ +60°C noncondensing 

When used with the CJC temperature sensor, model AC1361, provided on each channel of 6B Series backplanes.
Specifications subject to change without notice.