Circuit pad formula in multi-instrument?

[majorwong]

Hi,it seems that multi-instrument can be used to measure about 50V for electronics.
But no circuit pad formula was there in the manual.
By the way,how to do this for an accurate number for testing your power?For example,i need to test only 30V,any formula to calculate your attenuation resistor wiring your soundcard?

Thanks!

[VirtinsTech]

Multi-Instrument supports a wide range of ADC and DAC hardware devices. If you need to measure voltages up to 50V, we recommend using our USB DSO series. For more information, please visit https://www.virtins.com/oscilloscopes.html.

If you prefer to use a sound card instead, please note the following:

1. Calibration
Sound cards are typically not voltage-calibrated. To perform accurate absolute voltage measurements, you must first calibrate the sound card. Please refer to Section 2.6.2.3 "Calibration" of the software manual for detailed instructions.

2. Input Voltage Range
The maximum allowable input voltage for most sound cards is significantly lower than 50V. To prevent damage and ensure accurate measurements, you must attenuate the input signal. Please refer to Section 1.4 "Input & Output Connection for Sound Card Based Systems" of the software manual.

3. Frequency Range
Only AC signal within audio frequency range can be measured.