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You definitely don't have enough test gear.
Not nearly enough for what I'm doing
Need to monitor and display 128 analog channels from the device we are developing, which can produce up to +-75V independent outputs with 15 bit precision. It's like a HV 15 bit 128 output AWG, the outputs must be perfectly balanced in that if one phase is +68.657 volts, the next phase must be -68.657 volts within a couple millivolts as the output waveform bi-phase toggles back and forth. The slew rates must also match to this level. The waveforms are created from high resolution DACs, then bi-phase modulated and amplified up to the +-75V levels.
Needed variable supplies that's precise and stable, and with low noise voltages outputs with precise low level current limits. Selected 3 of SPD3303X. These produce +-7V, +-60V, +5V, +3.3V, another supply provides +5.5V and two precison voltage reference sources provide 2.500V and 0~10V variable. If we need the supplies for the higher ranges then a couple switch mode 120V supplies are used, but these produce some switching noise which masks getting very accurate measurements, so only used when the highest output voltage are required. The SPD3303X are very quiet and stable supplies, really like them
A custom low noise SMPS design is underway to supply all the required voltages. Eventually this may lead to a custom chip design.
Thinking about displaying 16 channels simultaneously, could use ADC and such, but would need 16 input stages (they need to be very low capacitance, like one gets with a quality scope probe), high impedance, variable voltage ranges, and such. 8 Channels scopes seem expensive, so maybe using 4 4 channel DSOs synched up, but that's down the road some, no time for this now.
Anyway, the SDM3065X seems stable at 80uv high on 10V compared to the other DMMs.
SD is showing 2uv for 35K samples
Now back to design work
Best,