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@ -39,6 +39,11 @@ Now, the resistors for this amp seemed to be affecting the pass or fail, replaci
## Replacing the capacitors ## Replacing the capacitors
To save the meter from an early demise, I replaced all the capacitors, and indeed some seemed to be leaking already, I was lucky to replace them before the corrosion got worse. To save the meter from an early demise, I replaced all the capacitors, and indeed some seemed to be leaking already, I was lucky to replace them before the corrosion got worse.
<p float="left">
<img src="3458-WorkLog/imgF.png" width="45%" />
<img src="3458-WorkLog/Caps.JPG" width="45%" />
</p>
Another healthy upgrade I did was to update the firmware to the latest version, which improved the accuracy of the meter to some extent due to the various mathematical updates to said firmware. In the service note [here](3458-WorkLog/SN12C.pdf) one can find the fixes listed. But as a quick overview on some fixes from Rev 4 to Rev 9 are: Another healthy upgrade I did was to update the firmware to the latest version, which improved the accuracy of the meter to some extent due to the various mathematical updates to said firmware. In the service note [here](3458-WorkLog/SN12C.pdf) one can find the fixes listed. But as a quick overview on some fixes from Rev 4 to Rev 9 are:
- Revision 8,X: Period measurement correction - Revision 8,X: Period measurement correction
- Revision 7,X: Resets line frequency to 60Hz - Revision 7,X: Resets line frequency to 60Hz
@ -48,8 +53,7 @@ Another healthy upgrade I did was to update the firmware to the latest version,
- Revision 5,X: Sending “AZERO ONCE” does not always cause the 3458A to immediately make the autozero measurement. - Revision 5,X: Sending “AZERO ONCE” does not always cause the 3458A to immediately make the autozero measurement.
<p float="left"> <p float="left">
<img src="3458-WorkLog/imgF.png" width="45%" /> <img src="3458-WorkLog/FW-UPGRADE.JPG" width="45%" />
<img src="3458-WorkLog/Caps.JPG" width="45%" />
</p> </p>
## U180 drift evaluation ## U180 drift evaluation