# Optimization voltage divider measurement

How to design a voltage divider to optimize the measurement error?

Intuitively I would take the same ratio $$\frac{load}{divider} = \frac{divider}{measurement}$$ As follow: the voltage is roughly divided by 5. The divider induces 1% error on the load, and the measurement 1% error on the divider.

Is it a good practice?

simulate this circuit – Schematic created using CircuitLab

• You can use a voltage follower. Adding a voltage follower to the voltage divider circuit isolates the load impedance (Rmeasurement) so that VOUT is dependent upon R1 and R2, not Rmeasurement. – Remco Vink Oct 16 '18 at 8:31
• yeah sure, but I want to make it simple, I have 32 inputs in parallel and do not want to implement 32 voltage followers :) so I want to optimize my voltage divider – Rémi Baudoux Oct 16 '18 at 8:36
• What makes you say that the "divider introduces 1% error on the load"? The voltage across the load and across the divider must be identical (for an ideal voltage source). – Elliot Alderson Oct 16 '18 at 13:27