Impedance open circuit calibration problems.

[SebBo]

Hi,

I am having issues with the open circuit calibration for impedance measurements. I have a known 100.2R reference resistor and use an ID14 mk2 for measurements. I have triple checked the cabling is correct.

The issue appears to be during the calibration sweep, right after the actual measurement finishes. The measurement drops drastically with about 1-2 seconds left and I get this error, as I have seen others also get:

The level meter shows nearly identical readings for the two channels throughout the sweep until the last second where the measurement drops and I get this error.

Edit: This is version 5.40

 

[SebBo]

Update: Arta Limp calibration gives me a calibration of 0.01dB difference.

 

[John Mulcahy]

Please post images of your REW soundcard preferences and the Measure dialog before running the cal.

 

[SebBo]

I've packed it all down since I got the measurements I needed from Limp, but I'll let you know if I try again. The dialog before calibration said something along the lines of leaving the load leads open, which they were.

 

[SebBo]

Please post images of your REW soundcard preferences and the Measure dialog before running the cal.

Hi John. I recently picked this back up with a new project and still have the same issue. New cable jig, new interface, new PC and the latest version of REW.

 

[John Mulcahy]

Make sure there is no monitoring active on the interface mixer. One way to check that would be to leave all the connections as they are and just make a normal SPL measurement and look at the result, which should be flat.