U/I 8 Branches Monitoring

Purpose

Monitors each channel's voltage/current and compare them with the global Voltage and current Bias. The sum of the channels' currents should match the Qpump current value. When each channel is turned on, its voltage should also be approximately equal to the VBias. Any discrepancy indicates a potential current leak or disconnection.

Presently the procedure described above is not yet implemented

Diagram and Equations for monitoring 8 channels' voltage and current

Table of values associated with the 8 channels V/I measurements

R1/%       R2/%        R3/%        #of bits        VREF     (VREF/1024)    Attenuation
100R/0.1%  976k/0.1%   24.9k/0.1%  10 bits(1024)   2.43V     0.002373      0.0248776

           R1    A/V      #of bits          VREF       A/DAC
IBMon     100R    1.    16 bits (65536)    1.25V      5.96E-9

DataSheet

Current monitor HV7800 16bit ADC LTC2495