Products > Test Equipment
Stanford Research SR715 LCR Meter Teardown
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barnacle2k:
Because of all the recent talk of LCR Meters, here my newest acquisition fresh from ebay:
A Stanford Research SR715 LCR Meter, it boasts a 0.2% base accuracy rating.
It came with the full manual in a binder, as always with Stanford Research gear the manual contains the full schematics.  ^-^
Also included a nice pair of Kelvin clips.
Did some basic measurements to test it out, but I don't have any capacity or inductance standards.
It has a RS232 interface for PC connectivity, the GPIB option is not fitted.
Another nice feature is the external bias connection via banana plugs on the back for up to 40V or 100mA.

Measuring 100n 5% Wima:


Small hand-wound inductor 100µH calculated:


1.000K resistance standard:


100.00K resistance standard:


How well does it measure LOW ESR? (Yes that is a 1000µF 1200V foil CAP)


A big old inductor (rated 4.7H @ 100mA):


1000µF standard capacitor:


The very nice manual:




Original cal certificate included:


TEARDOWN time (4 Screws later:)

Boring switch matrix:


The money shot:


Beefy protection circuitry and filter caps: (Nichicon of course)


The only SMD part I could find on that board:


Dale precision resistors:


CPU is a Zilog Z80:


Under the input:

Lightages:
Thanks for the look inside. It is always interesting to see how different designs of the cases have converged over the years. That is a very different looking case. Also interesting is the neon lamp being used as a "spark gap".
AF6LJ:
Thanks, nice tour through that LCR meter.
Vgkid:
Thanks for the teardown, i guess i will post the insides of my bridge.
Salas:
Very nice pictures. The form factor reminds of cash registers though. Weird choice for test gear.
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