3V And 5V Ldo Regulator Tests; Figure 31. Ground Reference For Voltage Measurements Are Upper 2 Corners, The Lower 2 Are Not - NORCAL NC2030 Manual

3v and 5v LDO Regulator Tests

Figure 31. Ground reference for voltage measurements are upper 2 corners, the lower 2 are not connected
When connected, measure the voltage across the battery. It should be at least 7 to 9v.
Measure the voltage at the switching supply 3.3v output. It should be between 3.1 to 3.3v. See figure
15 above.
Measure the voltage across C11 on the first set of regulators installed. The voltage should measure 2.9v.
The LDO regulator needs at least 0.15v difference from the input (3.3v) to the output (2.9v) in order to
properly regulate.
Measure the voltage across C12 on the first set of regulators installed. The voltage should measure 2.9v.
The LDO regulator needs at least 0.15v difference from the input (3.3v) to the output (2.9v) in order to
properly regulate.
Measure the voltage across C102 on the second set of regulators installed. The voltage should measure
2.9v. The LDO regulator needs at least 0.15v difference from the input (3.3v) to the output (2.9v) in
order to properly regulate.
Measure the voltage across C1 on the second set of regulators installed. This gives the input voltage to
one of the two 5v regulators. The voltage should measure the same as the battery voltage measured
above, roughly 9v.
Measure the voltage across C8 on the second set of regulators installed. This is the output of one of the
5v regulators. The voltage should measure 5v.
Norcal NC2030 v5 12-18-05
Page 35 of 128