Products > Test Equipment
SDM3045X to SDM3055X-E "Improvement" Thread
KungFuJosh:
--- Quote from: MarkKn on September 23, 2023, 05:56:47 pm ---Was this discussed before and it was determined that the digits increase, but beyond the accuracy?
--- End quote ---
There's no accuracy issue. The 5.5 digit model for the China market is the same exact hardware. I did a comparison test with an SDM3055, and my X-E version was more stable in the smaller digits. I assume because the X-E model has had a lot more burn in time.
Here's the results of that test:
Note that it's a reference from AliExpress, and while it's a better quality one, I wouldn't bet any money on the cal data. Though it did appear to actually be handwritten.
Within 0.5 mV and more stable is pretty awesome performance.
Kleinstein:
From the pictures reports around the SDM3048 / 3055E uses a few cheaper parts than the full 3055. AFAIK the main ones are:
1) the input divider with separate resistors instead of a large ceramic divider
2) A REF5025 instead of max6225
3) simpler resistors in the ohm part
4) smaller relays (maybe less tolerant to switching with high voltage present)
5) smaller size shunts - more thermal INL expected
6) no fan : quite, but longer warmup time
So there is a chance to see a little more long term drift and also reference noise. Still even the cheap version it not that bad and well capable of 5.5. digits.
tautech:
--- Quote from: Kleinstein on September 23, 2023, 06:52:40 pm ---From the pictures reports around the SDM3045 / 3055E uses a few cheaper parts than the full 3055. AFAIK the main ones are:
1) the input divider with separate resistors instead of a large ceramic divider
2) A REF5025 instead of max6225
3) simpler resistors in the ohm part
4) smaller relays (maybe less tolerant to switching with high voltage present)
5) smaller size shunts - more thermal INL expected
6) no fan : quite, but longer warmup time
So there is a chance to see a little more long term drift and also reference noise. Still even the cheap version it not that bad and well capable of 5.5. digits.
--- End quote ---
Yes we know all this.
Topic is SDM3045X-E HW = SDM3055X-E China version.
glitchcatcher:
Has anyone tried the Siglent SCD30A shunt after a successful conversion?
Is the "Option Measure" available in current measure mode?
The shunt manual states: "Suggest only working with SIGLENT SDM series 5 ½ or 6 ½ multimeters."
The SDM3055X-E is a 5 1/2 one.
My SDM3045X definitely doesn't have that option.
KungFuJosh:
--- Quote from: flo.b on October 30, 2023, 11:28:31 pm ---The SDM3055X-E is a 5 1/2 one.
My SDM3045X definitely doesn't have that option.
--- End quote ---
I don't see that button using the SDM3055X-E firmware. Actually, it's not on the standard SDM3055 either.
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