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0 Replies and 605 Views Circuit for Measuring RMS Current Value using CR3110  605  0 Started by  Daniel Blair I am currently using the precision rectifier circuit found in the 'Precision Rectifier Circuit for CT Signal Conditioning' app note. I am using this in my application to monitor motor current using a CR3110-3000 current transformer across a 7.5 ohm burden resistor. I now need to monitor current to non-linear loads (e.g., from a VFD) and hence need to get a true RMS value. Is there a similar circuit recommendation for non linear applications that allows me to still use the same CT
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06/02/2015 3:23 PM
1 Replies and 929 Views Output isolation from input  929  1 Started by  Viktor Sokolov Hello, from your manual for CR5200 and CR5300: ' Output isolated from input' -Is it galvanic isolation Thank you.
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by  Tony HodgesJump to last post
10/13/2014 11:08 AM
1 Replies and 818 Views Repeatability of CR5200 and CR5300  818  1 Started by  Viktor Sokolov Hello, what are the repeatability of measurements for CR5200 and CR5300
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by  Tony HodgesJump to last post
09/23/2014 9:12 AM
1 Replies and 914 Views Current transducer CR5220  914  1 Started by  Viktor Sokolov I like to install 2 CR5220 -(up to 30ADC first and up to 10ADC second)- on one DIN rail. Is there has to be some recommended distance between transducers to avoid any interference Thank you.
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by  Tony HodgesJump to last post
07/31/2014 9:05 AM
1 Replies and 909 Views Measuring AC Voltage with CR4850-500  909  1 Started by  Kristin Chew Hi, I would like to ask more advise on how to verify the output of the Voltage Transducer CR4850-500 The datasheet stated that the DC output is proportional to the AC voltage input. My question is: 1. The output from pin 7-9 (L1-N, L2-N, L3-N) is in DC or AC 2. The output value is giving out 0-5 VDC after measuring the input VAC So, for example if my max voltage is 240 VAC, the transducer will output 5VDC Is there any graph showing the linearity of the input and output voltages ...
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by  Tony HodgesJump to last post
06/30/2014 10:31 AM
2 Replies and 1025 Views DC Current Direction Through CT  1025  2 Started by  Joseph Hafich Building a few panels using your CR5220 to measure DC current from a battery charger to the battery positive terminal, and then output a 4-20 ma reference for metering. I could power up and test to determine, but thought I might ask. Wire from the battery charger through () on the window then to the battery Current will generally flow from the charger to the battery (hopefully). Thanks
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by  Joseph HafichJump to last post
05/15/2014 6:59 PM
1 Replies and 961 Views DC Immune  961  1 Started by  Randy Smith I've got a DC load design that I'm adding an AC voltage to. The AC doesn't cross zero so I have to add a DC offset. I need to measure total current and the CT I'm using just isn't delivering the correct AC value. I'm convinced the DC component of the signal is skewing the RMS value somehow. I see that CR makes CTs that are DC immune which is exactly what I need. Question is, in a nutshell how does that work Does the CT simply ignore the DC component somehow Thank you, Randy
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by  Tony HodgesJump to last post
05/02/2014 1:32 PM
1 Replies and 1447 Views measure of differential current  1447  1 Started by  martino bonacossa Hello, I have a question I'd like to submit. I'm trying to achieve a measure of differential current. I'm using a CR8348-2000 in which I inserted into the hole in both phases (phase and neutral). As the load resistance across the CR will use a 90.9k, then enter a LTC1967 and from there into a PIC. The scheme is in fact the one in the LTC1967 data sheet ( on page 26. The problem is the response time. thanks for your cooperation and sorry for ...
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by  Tony HodgesJump to last post
12/27/2013 8:07 AM
1 Replies and 1632 Views AC current monitoring  1632  1 Started by  Vipin Kapoor hi! In one of our application; We want to monitor the AC current of already installed device & would like to transmit this AC current data via RS 232 interface for DATA logging purpose. Current range would be 0~40AAC, 50hz. Can you pls. suggest any cost effective solution
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by  Tony HodgesJump to last post
09/05/2013 11:24 AM
1 Replies and 1460 Views CR5210-50  1460  1 Started by  Robert Batta Hi, I have a CR5210-50 that I am using to measure DC load on a 12v distribution panel. I've wired the CT as drawn in the instruction, supplied 24vdc power, but the readings I am getting do not match the measured load: The amp readings below were taken is a separate amp meter and compared it to the voltage output on the CT: 2.86A - 2.35volts 9.9A - 2.08volts 11.4A - 201volts 12.9A - 1.96volts 13.8A - 1.03volts I feel like I'm missing something obvious.
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by  Tony HodgesJump to last post
08/26/2013 9:20 AM
1 Replies and 1543 Views Isolated AC Voltage and current Measurement  1543  1 Started by  David Wilson I am looking for a good way to create an isolated voltage and current measurement signal conditioner for a 120Vac 60Hz, 20A test. The inputs to my data acquisition system are /-10V. I need to measure voltage with 1/2 accuracy, current (2-3 accuracy is acceptable), total harmonic distortion, power factor, etc. Are there some recommended transformers for this application
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by  Tony HodgesJump to last post
08/13/2013 10:15 AM
1 Replies and 1445 Views Hi-Freq Lamp Ballast Current Monitoring  1445  1 Started by  Basel Z Hello, I have an application where I want to monitor the current from the output of a lamp ballast. The Ballast specs: * Output is a sine-wave (mostly sine-wave, but gets a bit distorted at higher output power) * Vout = 200-400V (peak at 1600V during ignition <250ms) * Iout = 3-10A (12A max) * Freq = 40-200kHz I believe the CR8448-2000-F is my best choose. I have a rectifying op-amp circuit to receive the output of the CT and I'm thinking of using a burd...
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by  Tony HodgesJump to last post
07/23/2013 1:07 PM
2 Replies and 1935 Views ENERGY MONITORING  1935  2 Started by  MOHUMMUD JAINOODEEN Hi, I need a circuit diagram in order to build an energy monitoring module with my CR3110-3000 current transformers.Any help or suggestion please. Thank you Mohummud
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by  MOHUMMUD JAINOODEENJump to last post
03/21/2013 1:31 AM
1 Replies and 1702 Views Wire routing  1702  1 Started by  Dan Blocker I need to route the CT leads and the 480VAC lines to a near by cabinet for power monitoring. I will be using TSP wire for the CT leads. Should I run CT leads in a seperate conduit from the 480VAC lines or will the TSP wire be enough to prevent any interference on the CT leads
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by  Tony HodgesJump to last post
03/07/2013 12:07 PM
3 Replies and 2131 Views Calculate Compressor Current by using Power and Voltage Transducer  2131  3 Started by  Ahmed Abdulbaky Please I need Your Help in this Application , we need to Measure the Current Consumed by a Compressor From single Phase , But we only have a Power Transducer (Part CR6210-250-20) and Voltage Transducer, so is it Possible To Calculate the Current From these Measurement Thanks Ahmed
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by  Tony HodgesJump to last post
12/31/2012 9:58 AM
2 Replies and 1963 Views Monitor Main entrance  1963  2 Started by  Allan Stanley I would like to monitor the AC entrance to my Barn. I have been using a product from Ubiquiti Called MFI to monitor current on a few AC motors, among other things. The Mport they sell requires a 0 to 2 volt DC input from a sensor. The sensor they have now is 100A rated and not large enough to clamp over the 400 A entrance cables. Looking for any recommendations of products found here. It's 2 lines . I would also like to have a more sensitive clamp for the neutr...
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by  Allan StanleyJump to last post
12/11/2012 6:28 PM
1 Replies and 2253 Views CR5200 - Wire Vibration  2253  1 Started by  Robert Cavagnaro Would vibration of a wire being being monitored through a CR5200 transducer affect measurement capability
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by  Tony HodgesJump to last post
08/28/2012 1:16 PM
1 Replies and 3276 Views CRD4170-5 user guide and software  3276  1 Started by  Bach Dien Hello, Please point me to where I can download user's guide and any configuration software for CRD4170-5 What protocol does it use to communicate MODBUS Thanks
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by  Tony HodgesJump to last post
10/04/2011 10:46 AM
5 Replies and 5452 Views Just need to detect run state of 3phase motor  5452  5 Started by  joe baird I need to detect the run state (on/off) of a three phase motor with a microprocessor with pins rated at 3.3v max. I have a slight preference for a digital signal but an analog signal is fine if it is 0-3.3v with some threshold meaning on. What is the simplest and most economical (I need many of these) way to do this with a CR product - a split core device would be great but I can make do with a solid core. Thanks!
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by  Tony HodgesJump to last post
12/06/2010 2:27 PM
1 Replies and 4249 Views Question about Vmax RMS  4249  1 Started by  Eric Sandeen I'm using a pair of CR8410-1000 CTs to monitor a circuit in a distribution panel, which will not exceed 15A (15A breakers) Therefore these 20A Ir CTs seemed to be the right choice. I wish to measure their output via an ADC which has an input range of 0-5V, and therefore I've biased the input by 2.5V. I notice, however, that the CR8410-1000 CTs have a Vmax of 2.1Vrms, and the datasheet suggests that the burden resistor should be chosen to limit V across it such that V < Vl <...
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by  Tony HodgesJump to last post
09/27/2010 9:43 AM
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