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1 Replies and 1692 Views 3 phase 3 wire CT instal  1692  1 Started by  Art Goodman I'm using the CR8350-2500-N current transformer to measeure 3 phase 3 wire system. I need to know the correct install for your CT. When H1 faces the source on L1 and L3, I get a Negative Active Power reading. When L1(H1) faces the source and L3(H1) faces the load my Active Power is Positive. Which way is the correct install.
1 1692
by  Tony HodgesJump to last post
05/28/2013 8:27 AM
1 Replies and 1862 Views CT Recommendation  1862  1 Started by  Joe Rocci I have an application that requires current monitoring of a 220VAC load up 100 amps. I'd like to use a split-core CT. The output of the CT would drive a load resistor to develop a voltage that is sampled by an A-D converter in order to make various measurements. I'm looking at the 604-1000T for this. Since this is a 3000 turn unit, can I assume that, with 100 amps in the load, the output current would be 0.033A Can I also assume that, if I load it with 1000 ohms, the output voltage would be 33V...
1 1862
by  Will LowesJump to last post
05/07/2013 11:21 AM
1 Replies and 1735 Views amy 5395 with High and Low limit?  1735  1 Started by  Ron Fial Is there any version of the 5395 or similar product to sense DC current where the output relay closes betweeen, say, 1A and 3 A, but relay is open below 1A and relay is open above 3A. It would need two adjustments instead of the single on on the 5395. Thanks
1 1735
by  Tony HodgesJump to last post
04/12/2013 7:54 AM
1 Replies and 1824 Views CR5210-5  1824  1 Started by  Steve Smith I have several CR5210-5 CT's I use in my EGSE Racks to monitor the main power supply current which I send to a 0-10V panel meter. I have a 28VDC power supply used to power all the front panel meters, I tapped off of this Supply to the input of a L7824CT Voltage Regulator to power the CR5210-5. I recently had to change a CT because it was outputting 10mV with no current flow, (the main pwr supply was unplugged). I now have another CT that is outputting 6mV with no current flow.I have several q...
1 1824
by  Tony HodgesJump to last post
03/01/2013 11:19 AM
1 Replies and 1982 Views CR8448-1000  1982  1 Started by  Armando Mora I bought a CR8448-1000, but the CR8400 series data sheet doesn´t list its parameters (Ir, Vmax RMS, Te, DCR and frequency). Could you tell me about them Thanks.
1 1982
by  Tony HodgesJump to last post
01/18/2013 11:16 AM
1 Replies and 1896 Views Effect of Multiple (in-line) transducers?  1896  1 Started by  Travis W For my application, I would like to measure single-phase and three-phase test objects in two different setups: A: Volts - Amps - Watts - Power Factor B: -- C: -- A: Volts - Amps - Watts B: Volts - Amps - Watts C: Volts - Amps - Watts How much effect, if any, would the extra transducer (or two) have on the other transducers in that 'leg' of the circuit or in comparison with the other two legs It appears that the transducers have sufficient input i...
1 1896
by  Tony HodgesJump to last post
12/18/2012 3:56 PM
1 Replies and 1945 Views 3-Phase vs 1-Phase Power Measurement  1945  1 Started by  Travis W I want to accurately measure single-phase and three-phase test objects. The test set may be connected to a single-phase or three-phase power source (depending on which test bay I'm in). The information for 6250/6260 says that all three inputs are needed. When I switch over to single-phase measurement (e.g. single-phase test object), will I need to switch over to a single-element transducer such as the 6220 (which measures with one element)
1 1945
by  Tony HodgesJump to last post
12/18/2012 1:39 PM
1 Replies and 1967 Views Model 19  1967  1 Started by  Tony Heweston Basic 240v single phase wattmeter Hi am looking at using an AD633 four quadrant multiplier and driving the input reference voltage from a resistor network across the supply and the current reference via a Model 19 current transformer with the possible addition of a LM324 to provide some gain for the Model 19 output. Max current should be about 20amps. Would this seem to be a workable application for the Model 19 product
1 1967
by  Tony HodgesJump to last post
12/03/2012 10:46 AM
1 Replies and 2007 Views Accuracy 8459-2000N and 8450-2000  2007  1 Started by  Douglas Correa I would like to know what is the accuracy of the 8459-2000N and 8450-2000 (current transformer) thanks in advanced!!
1 2007
by  Tony HodgesJump to last post
09/26/2012 12:05 PM
1 Replies and 2091 Views Sense current with DC output  2091  1 Started by  Mark Carlile I've got a model 19 CT and need to get a DC output signal for monitoring a 2hp single phase AC motor. Using application guide titled 'Precision rectifier circuit for CT signal conditioning' has proven unsuccessful thus far. Details: 1) I'm assuming the two back to back zener diodes are to protect circuit from in-rush current when motor is starting. 2) Line amps will be between 5 and 15 amps. Using 10 amps with a 230 turn model 19 gives .04A. Applied to a 22ohm resistor should give ab...
1 2091
by  Tony HodgesJump to last post
09/26/2012 12:00 PM
1 Replies and 2094 Views Spice Models  2094  1 Started by  J Henzel Are there any spice models available for the CR3110-3000 current transformers Thanks JPH
1 2094
by  Tony HodgesJump to last post
09/10/2012 8:33 AM
1 Replies and 2050 Views CR5210 output options  2050  1 Started by  Darren Barnes Are there any custom options available for the CR5210/11 Specifically, I would like to use the output to operate a relay at full-scale voltage output. I don't want to wire to a discrete FET, then to a relay. Would prefer a ready-made module. Basically, I need a current switch that will kickout another circuit at 300 ADC. Thanks.
1 2050
by  Tony HodgesJump to last post
08/22/2012 10:06 AM
3 Replies and 2836 Views CR5300 Input Impedance  2836  3 Started by  Nathan Kingston I would like to know the input impedance of a few different versions of the CR5300. CR5310-5 CR5310-10 CR5310-50 Thanks.
3 2836
by  Tony HodgesJump to last post
06/21/2012 2:08 PM
1 Replies and 2190 Views CR5210-1  2190  1 Started by  Ed Smith Is the CR5210-1 bidirectional If the 0-5V output version is selected, what is the 0 current and full scale (both directions) output voltage
1 2190
by  Tony HodgesJump to last post
05/15/2012 10:56 AM
3 Replies and 2913 Views Sensing AC current  2913  3 Started by  Jim dePrado I am looking to build a way to automatically turn on the dust collector (220V 30A) in my woodworking shop when one of the other tools is turned on (110V/220V 15-30A). Would it be possible to hook up one/many of your current sensors to the hot leg of each tool's circuit and send that signal to a relay to turn on the dust collector Which products would you recommend Any help would be appreciated. Thanks, Jim
3 2913
by  kevin woodJump to last post
05/10/2012 12:30 AM
1 Replies and 2091 Views Transducer Mechanical Models  2091  1 Started by  Brent Hiller Greetings, I'm wondering if there are STEP models available for for your AC and DC transducers. Thanks.
1 2091
by  Tony HodgesJump to last post
05/09/2012 4:21 PM
2 Replies and 2290 Views Accuracy and time response CR4100 and CR2DARL-500  2290  2 Started by  Samuel Fonseca Soto We are setting up a power logging station and we would like to know if we would get better accuracy and better response time with a CR4470 than a metering current transformer CR2DARL-500 We are able to read 0-10 VDC or up to 5A signals. Any of the monitored equipment will be consuming more than 30A. Any orientation will be appreciated.
2 2290
by  Samuel Fonseca SotoJump to last post
04/18/2012 10:30 AM
1 Replies and 2298 Views CR4220-400  2298  1 Started by  Paul Rogers About 6 months ago we installed a CR4220-400 and the FLC of the motor it is on is 130A (checked with a handheld ampmeter) but the HMI display reads up to 424A. We have checked out the analog input card and it is ok and checked and double checked the ratio for the 4-20ma signal and it is ok. This CR4220 is on the motor side of a soft start instead of an across the line starter, we just wanted to know if this might be causing any problems before we replace the CR4220. Any advice Thanks
1 2298
by  Tony HodgesJump to last post
03/22/2012 10:30 AM
1 Replies and 2288 Views High Thermal Drift of CR5310-600  2288  1 Started by  Arseniy V We have a few CR5310-600 voltage transducers that are rated at 200ppm/C but we measured much higher thermal drift (we used calibrated oven, calibrated Fluke 8842A DMM, and calibrated powersupply). Here are a data points from our measurements (also attached as JPG file): Vin=608.41V Vout=5.0256V &91;54.1C&93; Vin=608.40V Vout=4.9974V &91;44.0C&93; Vin=607.14V Vout=4.7806V &91;33.5C&93; Vin=607.74V Vout=4.5974V &91;23.9C&93; Clearly you can see a significant ther...
1 2288
by  Tony HodgesJump to last post
02/23/2012 12:22 PM
1 Replies and 2338 Views Windings in CR8348-2500-N  2338  1 Started by  Wolf Homma I recently cut open a CR8348-2500-N. It appears that the windings are brought on in layers. From examining the design I concluded that there must be an 'upper' copper layer close to the hole on the CT. Naturally, this layer is closer to the bus bar going through the hole than the 'buried' layers underneath. From that it should follow that the CT is not a perfectly symmetrical component, if you consider the capacitance from the primary (high-voltage) bus bar to the 'upper' copper winding being hi...
1 2338
by  Tony HodgesJump to last post
02/16/2012 8:43 AM
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