Products > Test Equipment
HOW TO CALIBRATE SIGLENT SDG1032X
uargo:
--- Quote from: KungFuJosh on October 16, 2023, 09:13:05 pm ---
--- Quote from: uargo on October 16, 2023, 09:06:39 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.
--- End quote ---
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.
--- End quote ---
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
KungFuJosh:
--- Quote from: uargo on October 16, 2023, 09:20:54 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
--- End quote ---
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.
tautech:
--- Quote from: alm on October 16, 2023, 08:59:39 pm ---
--- Quote from: tautech on October 16, 2023, 08:53:20 pm ---Adjustment is a SW process and I know US branch has a Fluke 5200 for such needs. Not sure about EU.
--- End quote ---
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?
--- End quote ---
Sorry a $ $ Fluke universal calibrator, 5200 is wrong then.
alm:
--- Quote from: uargo on October 16, 2023, 09:20:54 pm ---I will have to buy a precise linear laboratory supply and use a potentiometer to reduce the voltage
--- End quote ---
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.
--- Quote from: KungFuJosh on October 16, 2023, 09:23:43 pm ---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.
--- End quote ---
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.
--- Quote from: tautech on October 16, 2023, 09:37:13 pm ---Sorry a $ $ Fluke universal calibrator, 5200 is wrong then.
--- End quote ---
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?
bdunham7:
--- Quote from: KungFuJosh on October 16, 2023, 09:13:05 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.
--- End quote ---
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!
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