Converter voltage/current - Simulation practice for DT470 - SD

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Converter voltage/current - Simulation practice for DT470 - SD

Post  Alessandro on Mon May 11, 2009 6:31 pm

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
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Alessandro

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Re: Converter voltage/current - Simulation practice for DT470 - SD

Post  mdipaolo on Wed May 13, 2009 4:27 pm

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

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