Author Topic: HOW TO CALIBRATE SIGLENT SDG1032X  (Read 3530 times)

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Offline uargoTopic starter

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #25 on: October 16, 2023, 09:20:54 pm »
I'm using the SDG1032X as a precision  DC voltage source to test a 16-bit ADC to see how accurate and stable my design is, noise levels etc.

As I said earlier, an AWG (in this case the SDG1032X) is NOT a precision DC voltage source. DC Offset is COMPENSATION only. The lower your voltage is, the less accurate it will be especially when you factor in voltage loss over cables. From what you posted, your AWG appears to be functioning as expected.

If you need a DC voltage source with that much accuracy, you need to buy or build an actual voltage source. This thread has a (not cheap) DIY DC voltage source: https://www.eevblog.com/forum/testgear/elektor-voltage-current-calibrator-project/new/#new

There are some great inexpensive DC voltage sources out there, but not with super high accuracy or adjustable voltages. If you're on a budget, you'd probably be better off getting a calibrated DC Bench PSU with good adjustment ability.

Yes I know, but it is what I have, I have the riden rd6006p that is quite accurate but it is switched and has some ripple.
I will have to buy a precise linear laboratory supply and use a potentiometer to reduce the voltage
 

Offline KungFuJosh

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #26 on: October 16, 2023, 09:23:43 pm »
Yes I know, but it is what I have, I have the riden rd6006p that is quite accurate but it is switched and has some ripple.
I will have to buy a precise linear laboratory supply and use a potentiometer to reduce the voltage

I get where you're coming from, but possession and budget don't redefine what a device is capable of. On the bright side, you don't need to waste any money on getting your AWG calibrated since it appears fine.

If I was doing something like what you're doing, I would look and see if the specs on something like the SPD3303X-E were sufficient for your needs. If not, then you need to look at voltage sources specifically, and that can get expensive for high accuracy.
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Offline tautech

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #27 on: October 16, 2023, 09:37:13 pm »
Adjustment is a SW process and I know US branch has a Fluke 5200 for such needs. Not sure about EU.
Why would they need a seventies-era AC voltage source to adjust an arbitrary function generator? DMM, scope, maybe power meter and spectrum analyzer for flatness and harmonics, but why a voltage source?
Sorry a $ $ Fluke universal calibrator, 5200 is wrong then.
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Offline alm

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #28 on: October 16, 2023, 09:59:47 pm »
I will have to buy a precise linear laboratory supply and use a potentiometer to reduce the voltage
I'd just build a fixed voltage divider, say 10:1 or 100:1, and adjust the voltage from the power supply/function generator. Be aware of the trade-off between output impedance / load regulation and dissipation in the resistors. If you use a pot, make sure you don't exceed their maximum dissipation.

If I was doing something like what you're doing, I would look and see if the specs on something like the SPD3303X-E were sufficient for your needs. If not, then you need to look at voltage sources specifically, and that can get expensive for high accuracy.
Is the SPD3303 really any better at the 1 mV level?

In addition to the Elektor project the PVDS2mini comes to my mind as reasonably affordable DC voltage source. Though not sure if Ian is currently able to produce them.

Sorry a $ $ Fluke universal calibrator, 5200 is wrong then.
Maybe I'm dense, but what good does a multifunction calibrator, which can generate a variety of DC and AC voltages (typically up to 1 MHz), currents and resistances do for adjusting a source like a function generator or power supply?
« Last Edit: October 16, 2023, 10:01:42 pm by alm »
 

Offline bdunham7

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #29 on: October 16, 2023, 10:01:13 pm »
As I said earlier, an AWG (in this case the SDG1032X) is NOT a precision DC voltage source. DC Offset is COMPENSATION only. The lower your voltage is, the less accurate it will be especially when you factor in voltage loss over cables. From what you posted, your AWG appears to be functioning as expected.

Not "precision" perhaps, at least not at the level the OP seems to need, but these AWGs are a perfectly fine source for DC voltages within reason and reading the specs, of course.  They're also not a terrible current source within their limitations.  They're stable enough to do calibration of lesser DMMs in tandem with a better one and supply enough current for many small DC breadboard projects.  You can even use them to test linear voltage regulator circuits for ripple rejection and transient response.  If you really want to be ridiculous, you can charge small batteries with them!
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 
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Offline KungFuJosh

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #30 on: October 16, 2023, 10:34:54 pm »
Not "precision" perhaps, at least not at the level the OP seems to need, but these AWGs are a perfectly fine source for DC voltages within reason and reading the specs, of course.  They're also not a terrible current source within their limitations.  They're stable enough to do calibration of lesser DMMs in tandem with a better one and supply enough current for many small DC breadboard projects.  You can even use them to test linear voltage regulator circuits for ripple rejection and transient response.  If you really want to be ridiculous, you can charge small batteries with them!

Precision was what he was asking for though. For basics it's fine. He wants under 1mV accuracy, but even the SDG2122X is spec'd as ±(1%+2mV) for DCV. TBH I've never used it for just DC, and it's pretty cool that the option is there.

Edit: I just checked and the SDG1032X is spec'd at ±(1%+3 mV) for DCV.
« Last Edit: October 16, 2023, 10:36:49 pm by KungFuJosh »
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Offline bdunham7

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #31 on: October 17, 2023, 12:21:30 am »
Precision was what he was asking for though. For basics it's fine. He wants under 1mV accuracy, but even the SDG2122X is spec'd as ±(1%+2mV) for DCV.

Yes, he either needs an SMU or he needs to have a higher precision meter in parallel--and there still may be stability issues.

Interestingly, the SDG2042X appears to be the most accurate source of DC voltage I have on my bench, and that includes a PD 5020 "Precision DC Source" that sports an LM399 reference.
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 

Offline KungFuJosh

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Re: HOW TO CALIBRATE SIGLENT SDG1032X
« Reply #32 on: October 17, 2023, 01:30:00 am »
Interestingly, the SDG2042X appears to be the most accurate source of DC voltage I have on my bench, and that includes a PD 5020 "Precision DC Source" that sports an LM399 reference.

It's probably my most accurate (adjustable) voltage source on my bench too...at least until I finally bite the bullet and build that Elektor project. OTOH, I don't know if I should trust it, but I have a TP3005P bench PSU that my SDM3055s thinks is accurate. 2VDC shows 1.9999V, 20V shows 20.004V, 30V shows 30.005V, 10mV (lowest possible) shows 9.738mV. That's not too shabby.🤷
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