There is nothing in the OS/firmware but you may 'hack' the button in a way that it is either pulled up or down to GND (you shall measure to find it out) for a while after powering the device (simple electrolytic capacitor and a resistor should do it).
Hints:
· by looking on the teardown pics I guess, J15 will probably be the connector where the power-on-button is connected.
and/or:
· See the teardown here: https://lygte-info.dk/review/DMMSiglent%20SDM3045X%20UK.html
Then search for "Q3", you may proceed from there on.
If you are successful, please add the needed information here.
Did anything ever happen with a user cal procedure that a third party cal lab (other than transcat) could use for any of these meters?
Back in 2017 a Hold bug was addressed: Modify Hold function arithmetic.
You can find all the improvements listed in the Revision notes that are with each FW update.
There is also a chance not applying Rel in an EMI noisy environment could result in false measurements in Hold mode.
Readings/s settings allow the meter to settle for more precise measurements.
SDM3045X is fanless but has some different range specs to its bigger brothers so you need check the datasheet KC.
SDM3055
Fast/Medium
(Attachment Link)
Slow
(Attachment Link)
Switching happens around the 2.3999 --> 2.4000V, sorry that I did the test with my Rigol DP832A didn't have time to warm-up my Burster Gernsbach reference.
Slow/Medium has the same number of digits.
Hope this answers your 1st question.
Teaser more to follow:
Hold mode, DCV, Filter ON, 10 minutes sitting idle with no probes connected.
Another thing noticed with 3045X was Hold measurements were slow to be recorded in Slow speed measure mode but just fine in Middle speed measure mode.
Any further requests before I put my stickers on it, check FW is latest and rebox it ?
KC, low readings happened to be Gnd planes and measurements were taken just seconds apart like you would when in normal use. No plan and only poked at a few pads and when it beeped moved on to another one.
Did anything ever happen with a user cal procedure that a third party cal lab (other than transcat) could use for any of these meters?Yes there is a user adjustment process available for SDM3055 and SDM3065X but it is only available on request and not for public release.
If owners can demonstrate they have adequate references to calibrate to/against the procedure is made available.
Did anything ever happen with a user cal procedure that a third party cal lab (other than transcat) could use for any of these meters?Yes there is a user adjustment process available for SDM3055 and SDM3065X but it is only available on request and not for public release.
If owners can demonstrate they have adequate references to calibrate to/against the procedure is made available.Can you please tell us to whom we have to send our request for the adjustment process?
Would be great to have just the right contact..
Thanks and best regards
Peter
I actually think the calibration could be done in a MUCH better and simpler way than the existing method to make general user calibration easier (for those wondering, I have the required information to do the user cal as I was asked to test out the calibration procedure).
My suggestion is to employ the arrow buttons in a special calibration mode, you would inject for example, a DC voltage in the DC calibration mode, and press the arrow up and down buttons to trim the reading on screen until it matches the calibration source, this could be done for all of the required calibration points, that way a manual user calibration could be done very easily without the current additional steps or needing to use automated calibration setups.