Tube Radio Forum - The friendliest radio forum on the net!
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Bought a New LCR Meter

Go down

Bought a New LCR Meter Empty Bought a New LCR Meter

Post by Dale H. Cook on Thu Nov 05, 2020 3:44 pm

A very useful piece of test equipment is an LCR (Inductance-Capacitance-Resistance) meter. I have owned one for many years for field use to evaluate inductors and capacitors.. I have a laboratory grade instrument in the shop - a General Radio Type 1608-A Inductance Bridge, but it is too big and heavy for field use.

For about 25 years I used an inexpensive LCR meter in the field. It was an Elenco LCR-1801 that had a guard terminal (used with shielded leads to reject noise and RF) but only measured to 200 uf. In recent years it has developed problems including a failure of one of the flat spring contacts for lead contact and problems with the rotary function/range switch. I decided to replace it, preferring the convenience of a battery-powered handheld LCR meter to the more cumbersome but more functional line-powered meters such as the Sencore Z-meters. I consulted fellow engineers who own LCR meters, and through a combination of reading manuals and reviews and borrowing meters for tests I reached a decision.

I bought a DER EE DE-5000 meter made in Taiwan. It has been rebranded by Extech, IET Labs, and possibly others. I learned that IET Labs, who bought most of the General Radio instrument designs, had rebranded this meter when a fellow engineer, whose DE-5000 mater I borrowed for testing, pointed out that he uses a PDF of the all-English IET manual in preference to the multi-lingual manual packed with the DE-5000. The fact that a company that manufactures high-quality impedance-measuring instruments for the bench would rebrand and sell this meter was an important consideration in my choice. It measures to 20,000 uf (values of 10,000 uf and higher display as millifarads), 2,000 H, and 200 Megohms (measured with DC or AC). It has selectable AC measurement frequencies in decade steps from 100 Hz to 100 kHz. It can also measure D, Q, Theta and ESR. It can measure in 4-wire mode, has guarded terminals, and a calibration function to compensate for the test leads used. I ordered mine with guarded alligator clips (with short 4-wire leads) and guarded 4-wire lead SMD tweezers. I passed on the factory external guard lead, preferring to roll my own using test lead wire that was much more supple than what the factory used. I also bought a pair of inexpensive Kelvin clips and rolled my own 4-wire Kelvin leads with guarded 2 foot leads made from RG-174. I also added a 25,000 uf 16 volt electrolytic cap (measured with my General Radio 1608-A impedance bridge at 27.4 millifarads) that I can use in series with an unknown capacitor for values above 20.0 millifarads. I have around $150 invested and have been well pleased with my DE-5000.
Dale H. Cook
Dale H. Cook
Member
Member

Number of posts : 99
Registration date : 2014-05-10

Back to top Go down

Bought a New LCR Meter Empty Re: Bought a New LCR Meter

Post by Chas on Fri Nov 06, 2020 12:04 am

Very nice Dale...

I have but one of the instrument functions in my lab at the moment. I cannot easily measure inductance, nor ESR.

I have trusted your judgements in the past. This instrument seems it has a good pedigree and will do all in a handhelds.

I just priced it at $129. I might get myself a Christmas present, early...
Chas
Chas
Member
Member

Number of posts : 158
Age : 73
Registration date : 2008-07-24

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum