Measurement with the multimeters R, L, C in the circuit. - Page 1
Forum section: electronics / testgear

author: tigr
author_rank: Regular Contributor
timestamp: August 24, 2017, 11:37:25 pm
content: With interest I learned that my multimeters has the ability to measure R, L, C in the circuit.

author: tigr
author_rank: Regular Contributor
timestamp: August 25, 2017, 09:13:06 pm
content: Good in-circuit measuring accuracy.

author: Kleinstein
author_rank: Super Contributor
timestamp: August 26, 2017, 07:18:15 am
content: It depends on the circuit if R / C / L can be measured in circuit. Sometime it works, but often it can not be done.

author: tigr
author_rank: Regular Contributor
timestamp: August 26, 2017, 10:10:18 am
content: Yes,of course. We will try to analyze it. While measuring inductances, there were no problems.

author: tigr
author_rank: Regular Contributor
timestamp: August 27, 2017, 08:59:56 am
content: Why do we need inductor measurements in the circuit? For example, we need an inductor 100 uH. The value is not indicated. The two multimeters have almost the same values. This means that the multimeter AMPROBE 37XR-A can be trusted.

author: tigr
author_rank: Regular Contributor
timestamp: August 27, 2017, 02:10:17 pm
content: Let's see how the industrial device measures R,L,C,ESR in the circuit.Sencore LC-103.Quickly Test Capacitors & Inductors In-Circuit& Fully Analyze Capacitors & InductorsFor All Of The Ways They Fail Out Of CircuitINDUCTOR VALUENow you can automaticallytest coils andtransformer values from0.1 microhenry to20 henrys with apatented inductance test. The ReZolver™is truly unique in that it tests forinductance and not inductive reactance,which is frequency dependent. To makethe inductance test just push theInductance Value button andautomatically read any inductance valuefrom 0.1 microhenry to 20 henrys directlywith the accuracy you need for moderncircuits. Full autoranging speeds up thetests and greatly reduces operator errors.INDUCTOR RINGERThe automatic ringingtest finds even oneshorted turn. Thiseffective Q test strikesthe coil under test with asharp pulse. The coil is tested to see howmany rings it will product until it dampensto the 25% level. Sencore Engineers haveempirically determined that any air coreor ferrite core coil will ring at least10 times before decaying to less than 25%,if it is not shorted or open. Any coil thatrings 10 or higher is good. This patentedtest is used in nearly 60,000 Sencoreinstruments daily and works every time.Dynamic Inductor Tests Analyze All Defects -Even Single Shorted Turns!http://www.broadcaststore.com/pdf/model/793702/LC103%20brochure-6956.pdfOn different cores in different points of the circuit, gives a very good result.Transformer.

author: tigr
author_rank: Regular Contributor
timestamp: August 29, 2017, 10:34:16 pm
content: Measuring capacitance in the circuit is the most difficult measurement. This is due to the shunting effect of other radio components. The lower the shunt resistance, the greater the measurement error.Ceramic capacitor.

author: ollopa
author_rank: Regular Contributor
timestamp: August 29, 2017, 10:45:26 pm
content: I don't understand what it is that you believe makes a meter suitable for in-circuit testing. The in-circuit impedance is going to be affected by the impedance of components and paths in parallel to the device under test. The only thing that the meter can change is the characteristic of the stimulus signal (voltage, current, frequency, and waveform), but that is only likely to show a difference in the case where you have frequency-dependent parallel impedances or if you have semiconductors in parallel and you stay below their turn-on threshold.The circuit typically dictates whether or not a component can be measured in-circuit regardless of the meter being used. I don't agree with you that just because two meters measure the same impedance in-circuit that it is a reliable measurement.

author: tigr
author_rank: Regular Contributor
timestamp: August 30, 2017, 07:14:02 pm
content: Quote from: ollopa on August 29, 2017, 10:45:26 pmThat's what we're trying to find out.Very good.