The HP 3466A uses a dual-ramp ADC. The Arduino is used to measure the discharge ramp time of the integrator capacitor (C402), RunDown (fig. 8.4 of the manual). The charge time (RunUp) of C402 is ...

respondTime = respondTime*0.7726; // Time calibration factor is 0.7726,to get real time microseconds for 4631board Serial.printf("respond time is %d\r\n",respondTime);` I asked them why their module ...