SCM5B Series

Yes, this behavior is normal. SCM5B45s are characteristically more sensitive to long term drift compared to other SCM5B modules. If you notice characteristics that are not within the module's defined specifications, please contact customer support or submit an RMA at https://www.dataforth.com/rma.aspx for recalibration of the module.

Dataforth does not currently offer an equivalent True RMS module for DC coupled inputs, but a two module solution could be implemented depending on the parameters of the DC offset and the AC waveform. Such an implementation was tested with an SCM5B33-03D True RMS Input Module (0-10Vrms input and 0-10VDC output) and an SCM5B31-02 Narrow Bandwidth Voltage Input Module (+/-5V input and +/-5V output). The inputs to these modules were tied in parallel and connected to a waveform generator with a specified VDC offset and VAC waveform within the input limits of the two modules. The outputs of the modules were then connected in series to get a combined output equal to the sum of their individual output voltages. Both modules were mounted on their own SCMPB03 single channel backplanes in order to maintain separate I/O COM lines for the required series connections to be made on the outputs. Alternatively a single SCMPB07 8-channel backplane could have been used since it allows for isolation of each channel's I/O COM line via a provided jumper. Please note that this combined module configuration will result in a small increase in total error since each module's parameters for accuracy are added up. If a two module configuration is not possible for a specific application, a custom version of the SCM5B33 with revised coupling circuitry might be possible depending on the required specifications. Be aware that custom module designs are subject to NRE charges and require a 10pc minimum quantity order.

DC channel to channel isolation for all SCMPB backpanels is 2121 VDC.

SCM5B, SCM7B, 8B SensorLex, and DSCA modules are well suited for use in high vibration environments. These modules and their associated accessories have undergone testing for random vibration, shock, and swept sine wave vibration. Details of each of these testing methods are provided below: Random Vibration (Operating): ○ MIL-STD 202G, Method 214A, Condition 1 - Frequency Range: 50-2000Hz, flat spectrum - Vibration Intensity: 7.56 Grms - Duration: 10min/axis (X, Y, Z) Shock (Operating): ○ MIL-STD-810F, Method 516.5 - Pulse Shape: Sawtooth - Test Level: 30G - Duration 11ms - Orientation: +/-X, +/-Y, +/-Z Swept Sine Vibration (Operating) ○ MIL-STD-810G, Method 514.6, modified - Frequency Range: 10-2000Hz - Vibration Intensity: 5Gp-p - Sweep Rate: 1 octave/min - Orientation: X, Y, Z Declaration of conformity for the above-listed tests can be provided upon customer request. Please contact customer service if a copy of the declaration is needed.

Yes, the SCM5B33 True RMS input module can be used with a PWM input signal. The module can be used with both sinusoid and non-sinusoid inputs. Module accuracy varies slightly based on the crest factor of the input waveform. Please refer to the "Specifications" section of the SCM5B33 datasheet for additional information on how crest factor affects module accuracy.

Two dimensional CAD models can be generated upon customer request. Please contact Customer Service for assistance.

The SCM5B47T-07 and SCM5B47T-07D differ in their output voltage ranges. The D suffix in SCM5B47T-07D signifies an output range of 0 to +10V. If no D suffix is present, as is the case for the SCM5B47T-07, then the output range is 0 to +5V. Aside from their output ranges, the modules are identical.

For the DSCA38-02, the +/-30mV range maps to the +/-10V output; -30mV input = -10V output and +30mV input = +10V output. The sensitivity is a specification that refers to the sensitivity of the strain gauges that are fully compatible with the module. If a DSCA38-02 is used with a load cell that has 2mV/V sensitivity, then the module's output is limited to two thirds of the full range (i.e. +/-20mV). This assumes the load cell has a rated excitation voltage of 10V. This reduced output range might be okay depending on the specific use case.

Yes, as long as the peak voltage of this signal does not exceed 1V in the positive range or -1V in the negative range. Since the SCM5B series has a 1500Vrms CMR rating, this signal could also be measured on top of a much larger signal up to 1500Vrms, as long as the differential signal going into the input of the module is no higher than 1V or no lower than -1V.

A 3kHz bandwidth on an input module means it can accept voltages from DC to 3000Hz. Any frequency higher than that and the signal will start to be attenuated by the filter at the input.

When the SCM5B34 receives a temperature input signal below negative full scale, the module’s output will drop slightly below 0V non-linearly, no lower than -0.7 to -1V.

Yes, any signal conditioning module series and MAQ20 I/O modules can be hot swapped. A minimal amount of signal settling time may result, but there will be no damage to the device.

Normally, a response time figure refers to how quickly a module's output can "respond" to a change in the input signal. "Response time, 90% span" refers to how fast a module can adjust its output when a step signal is applied at the input, where the magnitude of this step input is 90% of the input span of the module.

Unless specified otherwise in datasheets, 8B47, SCM5B47, SCM5B37, etc. outputs will go upscale outputs during open input conditions. Standard 5V output modules will go to 8V for upscale. Standard 10V output modules will go to 13V for upscale.

There is not a MAQ20 module dedicated to accelerometer input. However, it’s possible to frontend a MAQ20 voltage input module with an SCM5B48 Accelerometer Input Module using the Dataforth MAQ20-5B25 interface cable. You’ll have to purchase the cable, the module(s) and the appropriate size SCM5B backplane to make it work, but it is possible. Essentially, you have the SCM5B48 process the accelerometer input, and then the voltage output of that module is connected to a voltage input module in your MAQ20 system.

CJC is mandatory when using thermocouple input modules, or else you will not get an accurate measurement. Make sure to always purchase a backplane with CJC installed if you are using a thermocouple input module.

No, the CJC will work for all thermocouple modules that can be mounted to that backplane.

Yes, the DIN rail mounting hardware for the SCMPB04 can be easily detached and reattached from the board.

The SCMVAS-PB8 is the smallest available backplane for the SCMVAS module series. If you are looking for a small channel count, you may be able to find a suitable custom module in another product line with smaller backplanes that can handle high voltages in our Custom Product List.

Yes, the SCM5B4 can accept both grounded and ungrounded thermocouples due to the input to output isolation of the modules

Please see the SCM5B Module Dimensions and Pinouts link from the SCM5B section of our website: https://www.dataforth.com/catalog/pdf/scm5bdim.pdf You can also find the module dimensions and pinouts in our product catalog.

SCM5B392-xxyy are a two module pair. The intent is to have a voltage signal that can be transmitted across a long distance. When used together, an input voltage is converted to a process current, transmitted a long distance, then converted back to a process voltage. SCM5B392-1x modules can be used in place of an SCM5B32-xx if the I/O ranges are equivalent. However, the SCM5B392-1x modules have a 1kHz bandwidth while the SCM5B32 modules have a 4Hz bandwidth.

It is possible to use the SCM5B33 with SCMVAS. However, the output impedance of the SCMVAS-MXXX module at around 14.8k will be loaded by the input 1Mohm input impedance of the SCM5B33-02. This results in an approximate -1.5% positive full scale error.

Yes, this can achieved by connecting the positive output of the two modules together, and connecting this to one end of a load resistor. Then, connect the negative output of the two modules together, and connect this to the other end of the load resistor.

The DIN rail mounting of the SCMPB04 can mount to DIN rail types EN 50022-35x7.5, EN 50022-35x15, EN 50035-G32. These can be purchased as part numbers SCMXRAIL1-XX, SCMXRAIL2-XX, pr SCMXRAIL3-XX where XX is specified as the length of the rail in meters.

SCM5B47 module output is linearized with respect to the input temperature. SCM5B37 modules require a special calculation to determine the input temperature from a given output voltage. Please see our application note for more information on this: https://www.dataforth.com/thermocouple-voltage-to-temperature-conversion-method.aspx

Information on MTBF for SCM5B, SCM7B, 8B and DSCA is available on our website. Please see application note AN802 for more details. Application notes can be found under the "Literature" tab on the top navigation bar.

We do not recommend soldering the SCM5B pins to a board as it could potentially damage the module. Soldering the pins would also void the warranty. Many sockets are available which accept the mounting pins. TE Connectivity / AMP part number 50865-5 is an example of these sockets and any equivalent part will work as well.

With the SCM5B47x-xx connected to a proper backplane with CJC, with power being supplied, you can short the input terminals of the device to force a room temperature reading. Then you can check the output of the module and see if the output is what you're expecting. To determine what the proper output of a module is at room temperature, you'll need to look at the specific input and output range of the module you are using.

The largest backpanel for the SCMVAS modules is the SCMVAS-PB16 which has 16 channels. Multiple backpanels can be purchased if more channels are needed.

Yes, the quarter and half bridge SCM5B38 modules have the bridge completion resistors across terminals +EXC and -IN and -EXC and -IN internal to the module. Applying fixed resistors across the same terminals will have the same effect on a full bridge SCM5B38.

Yes, signal frequencies lower than the bandwidth of the input module (10kHz for standard products) will pass through to the output. The amplitude of the voltage signal will gained/attenuated based on the I/O specifications of the module.

Vout is used with input modules, which are all the SCM5B models except for the SCM5B39 and SCM5B49. Vin is used for output modules, SCM5B39 and SCM5B49. The reason for doing this is because input modules acquire a signal from the field side, and then output a corresponding signal to the system side. On the contrary, output modules acquire a signal from the system side, and then output a corresponding signal to the field side. Since SCM5B backplanes are designed for all channels to accommodate either an input or an output module, the terminal/pin that you would normally get your output signal from if you were using an input module is the same terminal/pin that you would be feeding your input signal to if you were using an output module.

Yes, calibration of Dataforth modules is traceable to NIST standards.

Please see application note AN501 for details: https://www.dataforth.com/thermocouple-voltage-to-temperature-conversion-method.aspx

The product datasheet lists the typical specs of +/-0.03% for the entire SCM5B41 family (at Ta = 25C and +5VDC power). The +/-0.08% is the maximum limit set during the production test.

No, converting any of the 16 channel SCM5B backplanes to something DIN rail mountable is a much more involved process than the SCMPB03/04. If you would like a 16 channel SCM5B backplane that can mount on a DIN rail you must purchase an SCMPB01-2, SCMPB01-3, SCMPB02-2 or SCMPB02-3.

No, all SCM5B modules have the same power requirements (5VDC) regardless of their I/O specifications. The power supply current draw of different products in the SCM5B line may vary.

Thermistor interface has never been designed for SCM7B, 8B, DSCT, or MAQ20 product lines. However, we do have some custom products in the SCM5B line that can accept thermistor interface. Any SCM5B36, SCM7B36, 8B36, DSCA36, DSCT36 module with potentiometer input 0-10kohm may also be suitable for some sensors.

Yes. Backplanes with no CJC will still come with the CJC enable installed on the backplane.

J1-J4 on the SCM5B backpanels are jumper cables, so they should have 0 ohm resistance.

The sensitivity is listed on the datasheet to help determine what strain gages/load cells will be compatible with that module. Strain gages do not have a specific voltage output range (i.e. -30mV to 30mV) but rather a voltage output range that varies depending on the excitation voltage applied to the strain gage (its "sensitivity"). Since our strain gage modules have a fixed voltage input range and a fixed excitation voltage, the sensitivity is the most reliable way to determine if a strain gage is compatible with our module. For example, a load cell with a 3mV/V sensitivity will output 30mV at full scale with a 10V excitation voltage, because 3mV/V * 10 V = 30mV. A signal conditioner with a 10V excitation and a -30mV to 30mV input range will be compatible with a load cell of 3mV/V sensitivity.

It is not recommended to ground the sensor wire shield to the 10-32 ground post on the SCMPB01 because that is the system side ground, while the sensor wire is on the field side. The sensor wire shield should be grounded to the field side ground, which varies based on the signal conditioner you are using. Please see the "Shield Grounding" application note for more information.

Technically, yes you could use an SCM5B41-07 in your SCMVAS system. However, it is not recommended since the output of all SCMVAS modules are -1 V to 1 V. Since the SCM5B41-07 has a -20 V to 20 V input range, most of that range will go unused while your accuracy suffers as a result since the SCM5B line has +/-0.03% span accuracy.

The factory configuration for jumpers J1 through J4 is the optimal configuration for most applications. If for some reason this jumper configuration will not work/is not working in your application, see our application note AN502 "Ground Connections and Host System Interfaces" for other valid jumper configurations and what situations you would use them.

No, the SCMPB03 comes with the CJC built into the backpanel.

The failure rate calculations for our SCM5B modules can be found in our application note AN503: https://www.dataforth.com/catalog/pdf/an503.pdf There are no dominant failure modes.

Yes, any of our SCM5B modules are able to be mounted and operated on Omega's OM5-BP-SKT-C board.

None of our standard SCM5B modules have a 50kHz bandwidth. However, it is possible to order a custom SCM5B module with 50kHz bandwidth. Keep in mind that new customs require a 10 pc minimum order and are subject to extra design fees.

PCOM is connected to I/O COM on the SCMPB04 through the use of a factory installed 0 ohm resistor. This resistor can be removed, but would need to be soldered back on if you needed to reattach it.

If you were to use a copper 10 ohm at 25 degrees Celsius RTD with the SCM5B34C-03 then your output would be offset by roughly 25 degrees Celsius resulting in incorrect readings. However, if you need an RTD input module with the same input/output specs as the SCM5B34C-03 that works with your RTD, we do offer the custom module SCM5B34C-1526.

Although we do not carry signal conditioners that can interface with AC LVDTs, we do have the SCM5B43, 8B43 and DSCA43 which can interface with DC LVDTs.

Our linearized thermocouple modules have a bandwidth of 3-4 Hz in order to reject any induced noise along the sensor line. If a wider bandwidth is needed, a custom module could be designed and manufactured to meet the required specifications. Contact Dataforth at support@dataforth.com to discuss your specific needs.

Yes, the SCM5B modules are isolated up to 1500 Vrms, which means that if the common mode voltage between the field side and system side is limited to 1500Vrms, the device will be protected. However, the input protection for SCM5B modules (i.e., the voltage across the +IN and -IN input terminals) is 240Vrms max.

Noise at the output of a module is independent of load resistance.

To convert an RMS voltage to its corresponding peak voltage, you simply take the RMS voltage value and multiply it by the square root of 2, or roughly 1.414. For example, 1500Vrms corresponds to a peak voltage of 1500 * 1.414 = 2121 Vp

A signal conditioner with these I/O ranges does not mean that the module ignores the polarity of your voltage input. The output of voltage input modules are scaled linearly, meaning an input of -1V would correspond to an output of 0V, an input of 0V would correspond to an output of 5V, an input of +1V would correspond to an output of 10V, and so on.

The recommended power supply for the Dataforth SCM5B and 8B modules are the linear power supplies in our SCMXPRT/SCMXPRE series. The SCMXPRT/SCMXPRE power supplies output 5V and have options for 1A output current (SCMXPRT-001) or 3A output current (SCMXPRT-003). The SCMXPRE series is identical to its SCMXPRT counterpart, but is configured for European voltage standards. The SCMXPRT-001/SCMXPRE-001 both have the option for DIN rail mounting as well (SCMXPRT-001D/SCMXPRE-001D). Other power supplies that meet that power requirements of the SCM5B and 8B modules can be used as well, but it is strongly recommended to use a linear power supply rather than a switch-mode power supply. Switching power supplies can add noise artifacts to the output of your modules.

The SCMXPRT-001 has an option for DIN rail mounting (part number: SCMXPRT-001D) but the SCMXPRT-003 does not. Instead, it can be mounted on the SCMXRK-002 which is a 19 inch metal rack for mounting the SCMXPRT-003 as well as various Dataforth backpanels and the SCMXIF interface board.

Yes, in general, Dataforth signal conditioning modules are a direct replacement for all Analog Devices signal conditioning modules. e.g. "SCM5B35-xx: Linearized 4-Wire RTD Input Modules" will replace Analog Devices "5B35: Isolated 4 Wire RTD Input Signal Conditioning Module". Please note that Dataforth signal conditioning modules are RoHS II compliant.

The SCM5B48 could require up to 165mA max from the 5VDC power source. Check your notebook's user manual for the current available from the USB connector or contact the notebook manufacturer and ask them for details.

Yes we can provide calibration reports for the modules that you purchased. You can either a) visit https://www.dataforth.com/TestDataReport.aspx to search for Test Report Datasheets by Serial Number or b) you can send us a list of model numbers and their serial numbers to support@dataforth.com

SCMVAS-Mxxx modules are high voltage input non-isolated attenuator modules. If used standalone, the module could potentially allow high voltage through to expensive data acquisition equipment. Therefore SCMVAS-Mxxx modules must be used in conjunction with an SCMVAS backpanel and an SCM5B30-07x or SCM5B40-07x isolation and signal conditioning module with input over-voltage protection.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx

Yes, as long as the 5B module is compliant with or exceeds Analog Devices Incorporated 5B specifications.

Keywords/Phrases: 5B, 5B module, backpanel, Dataforth backpanel

If you are inquiring about the ISO-RACK 16, Dataforth does not make that. Please look up www.mccdaq.com; they make the ISO-RACK 16 and accessories.

If you wish to purchase Dataforth backpanels and accessories, you can look up www.dataforth.com. The base model number for our 16 channel backpanel is SCMPB01 and our ribbon cables are 26 conductor and their base model number is SCMXCA004. I have included a link to the .pdf of the backpanels and accessories data sheet in the following line.

http://www.dataforth.com/catalog/pdf/scm5baccs.pdf.

“ If you are inquiring about the ISO-RACK 16, Dataforth does not make that. Please look up www.mccdaq.com; they make the ISO-RACK 16 and accessories.

If you wish to purchase Dataforth backpanels and accessories, you can look up www.dataforth.com. The base model number for our 16 channel backpanel is SCMPB01 and our ribbon cables are 26 conductor and their base model number is SCMXCA004. I have included the web address of the .pdf of the backpanels and accessories data sheet in the following line.

www.dataforth.com/catalog/pdf/scm5baccs.pdf

Keywords / Phrases:

ISO-RACK16, 34-conductor ribbon cable, SCMPB01, 26-conductor ribbon cable

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

On the SCMPB01, SCMPB02, SCMPB05, and SCMPB06 backpanels the threaded bolt is directly connected to I/O COM and to an array of jumpers which enable a variety of grounding configurations. In the Attachments box to the right of this Content box, open or download the SCMPB01 or SCMPB02 data sheet. For a thorough discussion of grounding configurations, refer to the Grounding section.

The max operating output current, which still allows the output voltage to remain within accuracy specs, for SCM5B input modules is +/-2mA.
The above limit allows a 5V output range module a >= 2.5k Ohm load.
The above limit allows a 10V output range module a >= 5k Ohm load.
The output current limit for SCM5B input modules is 8mA. At this current level the output load is 0 Ohm or a shorted output.

Keywords/Phrases: SCM5B output current, SCM5B input modules, max operating output current, output current

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

No. However, a 4-channel DIN mount SCM5B backpanel can be made from the following list of parts. Quantity Model Description 2 SCMPB04 or SCMPB04-1 2-channel 5B backpanel with SCMXCJC or without SCMXCJC 2 SCMXBEFE DIN mount base element with snap foot 2 SCMXSE DIN mount side element 4 SCMXVS DIN mount connection pins Or, alternately, if you already have SCMPB04-2 or SCMPB04-3. Quantity Model Description 1 SCMPB04-2 or SCMPB04-3 2-channel DIN mount 5B backpanel with SCMXCJC or without SCMXCJC Just add the following. Quantity Model Description 1 SCMPB04 or SCMPB04-1 2-channel 5B backpanel with SCMXCJC or without SCMXCJC 1 SCMXBEFE DIN mount base element with snap foot 4 SCMXVS DIN mount connection pins

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: 5B backpanel, power consumption, power requirement, total power, total power requirement

The major difference is the SCM5B41 is an input module and the SCM5B49 is an output module. This means that. The 5B41 module has its input on the isolated field side of the module connect to it through screw terminal blocks. The 5B41 module has its output on the system and power supply side of the module connect to it through ribbon cable connector (SCMPB01, SCMPB02, SCMPB05, and SCMPB06) or screw terminal blocks (SCMPB03, SCMPB04, and SCMPB07). The 5B49 module has its output on the isolated field side of the module connect to it through screw terminal blocks. The 5B49 module has its input on the system and power supply side of the module connect to it through ribbon cable connector (SCMPB01, SCMPB02, SCMPB05, and SCMPB06) or screw terminal blocks (SCMPB03, SCMPB04, and SCMPB07). Keywords/Phrases: 5B, 5B module, 5B input module, 5B output module, 5B41, 5B49.

Accuracy of Dataforth modules is specified and calculated as % of Span. The method is the following. Set the test voltage. Apply it to the module input. Measure the voltage at the module input. Calculate the expected module output voltage using the measured input voltage. Measure the output voltage. Calculate the % of Span error by the following formula. Accuracy error % Span = ((Measured Vout – Calculated Vout) / Output Span V ) x 100 This method works for input or output modules. Keywords/Phrases: Module accuracy, accuracy %, accuracy % of Span, Dataforth method for calculating Span accuracy