As previously noted, the post-regulated units require a fairly well-regulated input source, but provide tight load regulation and reduced output noise (PARD). Again, this is accomplished through the use of low-drop-out regulators on the outputs. The HL02R is a 2W converter in a DIP24 package with standard analog outputs up to 15V and standard analog inputs up to 24V. Unipolar and bipolar output configurations are available. The PWR1546AC unit has six-sided shielding, ultra-low noise of 1mVpp, and ultra-tight regulation of 0.02%. It is available in only one input/output combination of 5V in and ±15V out. It finds use in sensitive instrumentation and high-resolution imaging applications.