Just performed some measurements on Victor generator 1kHz
Note that this is not measured in ideal conditions: the generator is directly fed by 4x9V batteries here.
I think one may expect (much?) better results from properly regulated power supply.
Not too bad though
SINAD seems to be limited by noise.
I'm in Belgium, so 50Hz peak is linked to mains influence.
Black= RME ADI-2 Pro fs DAC signal, for reference (Unbalanced out, +13dBu range, -2.59dBFS level)
Red= Victor's 1kHz generator
ADC= RME ADI-2 Pro fs, Unbalanced inputs, +13dBu range
Victor oscilator level set to maximum
Measured with Virtins Multi Instrument 3.8 @48kHz 24 bits, FFT Window size 32768, Kaiser 6
(Note that there may be more spectral leakage with Victor's signal.)
Distortion figures:
A=RME, B=Victor
Highest distortion is H3, with around -116dB vs signal, which pretty much sets the level of THD (-115.6dB)
I've read somewhere that, typically, H3 will raise when powered from battery cells directly, due to their high internal resistance.
Other harmonics are all <-130dB, which make them hard to differentiate from the ADC distortions.
I paid around 50€ for the generator.