Converter voltage/current - Simulation practice for DT470 - SD

Converter V/I: (Basic scheme)



RL: Static impedance DT470 - SD (RL replacing the probe).
The values of the resistors are such that Vin is the order of about 1V, and IL is equal to 10*10^-6A.
This value is necessary for the operation of DT470 - SD.

Stability control in the current

Indirect control:
Measure VL: 1.00V
Measure RL: 100kOhm
Calculated value (IL): 10.0*10^-6A

The stability in time of the current (IL), was confirmed.

Direct control:
Direct measurement of the current in real time for 10min.
Stable value over time: 10.0*10^-6A
The value of Vin was calibrated in both cases.

Conclusions:
- Positive results in this simulation practice

Next Steps:
- Direct test with the probe DT470 - SD

For avoid auto-oscillation of positive fedback you can try to put in parallel to R4 one capacitor.