DVM

24-bit Digital Voltmeter

DVM Simplified Block Diagram

8-channel front-panel input mux, and a direct differential channel with 10M pulldowns
PGA binary gains of 1 to 128, typical accuracy ±0.03% ±50uV
Excellent 24-bit ADC with true differential inputs and digital filtering.
ADC typical accuracy: ±0.05% ±40uV. Resolution: 9nV to 1.2uV.

GUI (Graphical User Interface)

When a Gain is chosen, the Max Vin also changes.
"Auto" gain does binary search, starting at Gain=1, ±10V.
"Mux" pulldown is for Front Panel 40-pin IDC, Mux1 to Mux8 plus DVM-in.
Default is one-shot measurements, but averaging is available to reduce external noise.

API (Application Programming Interface)

C API:

void Set_Mux(int mux_addr);

float Set_PGA_Gain(float gain);

float Convert_ADC(int mux, float binary_gain, int msec_settlingTime);

float Auto_Range_ADC(int mux, int msec_settlingTime);

Python API:

set_mux(mux_addr)

set_pga_gain(gain)

convert_adc(mux, binary_gain, msec_settling_time)

auto_range_adc(mux, msec_settling_time)