SensorLex® 8B Series

Isolated Analog Signal Conditioners

8B MODULES

8B Miniature Signal ConditionersDataforth's new SensorLex® 8B line of isolated analog signal conditioners provides 19 family groups with a total of 123 models that interface to a wide variety of voltage, current, temperature, position, frequency, and strain measuring devices. Housed in a package only one-fifth the size of competing products, the 8B offers fully functional Instrument Class® performance with superior specifications such as ±0.05% accuracy, ±0.02% linearity, 5-pole filtering, 1500Vrms isolation, low output noise and much more.

APPLICATIONS

Designed for Embedded Applications
  • PC/104 Embedded Solutions
  • Compact PCI Systems
  • VMEbus Systems
  • PXI Systems
Protects User Equipment from Lightning and Industrial Equipment Power-Line Voltage Reduces Electrical Noise in Measured Signals Convenient System Expansion and Repair

CUSTOM SIGNAL CONDITIONING

Custom modules are available: consult factory for minimum quantity and pricing details on custom input ranges, output ranges, bandwidth, and other key parameters.
  • ±0.05% Accuracy (Typical)
  • ±0.02% Linearity
  • 1500Vrms Transformer Isolation & up to
  • 240Vrms Field-side Protection
  • ANSI/IEEE C37.90.1 Transient Protection
  • 5V Power (30mA Typical)
  • 5-Pole Low-Pass Filtering
  • Up to 120dB CMR
  • 70dB NMR at 60Hz
  • -40°C to +85°C Operating Temperature
  • CE Compliant
  • C-UL-US Listed (Class I, Division 2, Groups A, B, C, D)
  • ATEX Compliance Pending
  • Manufactured per RoHS Directive 2011/65/EU

SensorLex® 8B Series Product Family

Part Number Datasheet Description
Voltage Input Modules, Narrow Bandwidth
Current Input Modules
Isolated True RMS Input Modules
Linearized 2- or 3-Wire RTD Input Modules
Linearized 4-Wire RTD Input Modules
Potentiometer Input Modules
Non-Linearized Thermocouple Input Modules
Strain Gage Input Modules, Wide and Narrow Bandwidth
Current Output Modules
Voltage Input Modules, 1kHz Bandwidth
2-Wire Transmitter Interface Modules
DC LVDT Input Modules
Frequency Input Modules
Linearized Thermocouple Input Modules
Voltage Output Modules
Voltage Input Modules, 20kHz Bandwidth
8B Breadboard Kit
Power Supply Module
Accessories, backpanels, and module dimensions
Module Dimensions and Pinouts

Frequently Asked Questions


Does Signal COM (SCOM) connect with Power Ground (COM)?
Yes, Output Ground Common (SCOM in DB-25 & COM in screw terminal blocks) is the same as Power Ground Common (COM in Main Power & Alternate Power screw terminal blocks).
This is true for 8BP01, 8BP02, 8BP04, 8BP08, and 8BP16.

KEYWORDS/PHRASES: SCOM, COM, 8BP01, 8BP02, 8BP04, 8BP08, 8BP16, common, signal common

What is the function of backpanels for signals?
Think of the backpanel as a bidirectional signal transfer device whose direction is determined by the module in a particular channel.
For an input module, the signal is transferred from the field-side screw terminals to the system/power supply-side screw terminals or to a signal access ribbon cable header or D-sub connector.
For an output module it is just the reverse, the signal is transferred from the system/power supply-side screw terminals or from a signal access ribbon cable header or D-sub connector to the field-side screw terminals.

Keywords/Phrases: backpanel, 5B backpanel, 7B backpanel, 8B backpanel, SCMD backpanel

Am I right in assuming that the 8B modules cannot be Re-Calibrated in the field or by Dataforth?”
Dataforth modules are all designed to be highly stable, thus they do not require re-calibration.

8B modules cannot be re-calibrated in the field, but they can be re-calibrated by Dataforth.

We do offer a re-calibration service. For details, please contact sales by email at sales@dataforth.com or by phone at 1 800 444 7644 press 1 for Sales.

Does SCOM 0 to xx (15 max) connect to one signal common COM?
All Signal COMmon (SCOM) for all channels are connected to one signal common COM.

This is true for 8BP02, 8BP04, 8BP08, and 8BP16.

KEYWORDS/PHRASES: SCOM, COM, 8BP02, 8BP04, 8BP08, 8BP16, common, signal common, backpanel

Is the optional plug-in conversion resistor required in order to use the 8B32 module?
No, the optional plug-in conversion resistor is not shipped with nor is it required in order to use the 8B32 module. The current/voltage conversion is achieved by an internal resistor as shown in the block diagram in the data sheet.

The optional plug-in resistor could be used to shunt off some of the current from the module and allow a larger input current range; then it could also be used with voltage input modules to convert a non-standard current range into an input voltage range.

Keywords/Phrases: 8B32, internal resistors, plug-in conversion resistor

Why do I get no output on an 8B backpanel from an 8B input module?
On the isolated field side of the 8B backpanel, use the shorter screw terminals that are offset to the right and marked “-“ and “+” for the inputs to the module. Use the taller screw terminals that are offset to the left and marked “-EXC” and “+EXC” for modules that provide excitation.

Keywords/Phrases: 8B, 8B module, 8B input module, 8B backpanel

Can you explain what is the difference between the “Standard frequency range” and the “Extended frequency range” for the 8B33 module? I don’t see an option to order different module type so how are the two frequency ranges accessible to the user ?
The user does not have to do anything special; the module operates seamlessly over the full frequency range of 45Hz to 10kHz. We needed to split the full frequency range into two ranges so we could define and specify the different accuracy levels associated with each subrange.
If you look further down the 8B33 Specifications under Accuracy, you will notice the extended frequency range carries an additional +/-1.375% Span error and +/-3.25% Span error (-06). This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% + (+/-1.375%) = +/-1.625% Span and . +/-0.25% + (+/-3.25%) = +/-3.50% Span.

Keywords/Phrases: 8B RMS, 8B True RMS, 8B RMS input module, 8B True RMS input module, 8B33

Can the 8B41-12 withstand 300V input without damage?
The 8B41-12 module can withstand 300VDC continuous on its input terminals without damage. However, the output voltage will go to one of the internal power supply rails and remain there for several seconds after the input returns within the specified +/-60V input range."

Is the optional plug-in conversion resistor required in order to use the 8B42 module?
No, the optional plug-in conversion resistor is not shipped with nor is it required in order to use the 8B42 module. The current/voltage conversion is achieved by internal an resistor as shown in the block diagram in the data sheet.

Keywords/Phrases: 8B42, internal resistors, plug-in conversion resistor

What is the total power consumption of the 8B backpanel?
The total power requirement on the 5VDC power rail is the summation of the power requirement of the individual modules as specified in each module specification. For power budget purposes, multiply the total power requirement you calculated by 1.5 for maximum power needed.

KEYWORDS/PHRASES: 8B backpanel, power consumption, power requirement, total power, total power requirement

On the 8B51, can I apply the + and – input leads “backwards” to reverse the polarity of the output signal?
This can be done only if the voltage source is floating (isolated); this pertains also to the SCM7B modules.
Better modules for true differential operation for which a floating source is not needed are the DSCA30/31/40/41. Other modules for this type of operation are the SCM5B30/31/40/41 used with an SCMPB07-x with the I/O COM jumpers Jn removed in the channels for which true differential operation is desired. Both the DSCA and the SCM5B outputs can float +/-50V with respect to power supply common.

Keywords/Phrases: 8B51, reverse input leads, true differential

The SCM5B42 can function as an SCM5B32, why can't the 8B42 function as an 8B32?”
The 5B42 has separate passive input connections on +In and -In and the 8B42 does not. If you notice, the - input (pin 3) on the 8B42 has NC (No Connection) to the internal circuits of the module.
The 8BB42 can only be used with passive 2-wire transmitters because the only connection into the module is through the +EXC (excitation power out) and the + (return signal current input) connection.
In the 8B product line, the customer will have to use the 8B32-01 passive current input module.

Keywords/Phrases: 5B, 5B42, 8B, 8B42, 8B32-01, passive 2-wire transmitters, passive current input

What is the output resistance, how does the filtering work and what are the overshoot characteristics for a 8B51-03?
The 8B51-03 has an output resistance < 1 Ohm.
Its filter is a five-pole low pass filter which attenuates gradually up to the -3dB frequency of 20kHz above which it attenuates sharply at 100dB per decade of frequency. The filter has no overshoot because it is critically damped.

Is there an 8B module which can accept up to +/-50V, has >10k input resistance, <100 Ohm output resistance and can be sampled up to 250kHz?
The 8B51-12 can accept up to +/-60V input.
It has >500k Ohms input and <1 Ohm output resistance.
It could be sampled at 250kHz, but it will present unchanging data within +/-0.08% up to 92% of the samples. For it to provide new data it can be sampled up to a 20kHz sample rate.

8B backpanels: Are these products ESD sensitive? And if so, should the product be in sealed static shielding bags, and not an “Antistatic” bubble wrap, when shipped?
Static shielding bags are not necessary since the 8B backpanels are not ESD sensitive. The risk of physical damage is greater than the risk of ESD damage.

Keywords/Phrases: 8B backpanel, 8B backpanel ESD sensitivity, ESD, ESD sensitivity

For 8B49 modules when I give LabVIEW (or other DAQ software) an output command, I get no output from the backpanel, why?
That’s because the 8B49 and the 8B39 are output modules, are connected the reverse of input modules, they have their inputs on the system side (power supply side) of the backpanel. They provide their output on the isolated field side of the backpanel.

Keywords/Phrases: 8B, 8B module, 8B output module, 8B49, 8B39

I have an 8B33 module, what is the accuracy error between 0-5% span?
In the 8B33 data sheet, Note 4, For 0-5% Span measurements add 1% accuracy error (-02, -03, -04, -05) or 1.5% accuracy error (-01, -06). Accuracy error includes linearity, hysteresis and repeatability but not source or external shunt inaccuracy (if used).

Keywords/Phrases: 8B RMS, 8B True RMS, 8B RMS input module, 8B True RMS input module, 8B33 accuracy, span, offset