DC jacks, often referred to as DC coaxial power connectors, are typically measured by their physical dimensions to ensure compatibility with corresponding plugs. According to Wikipedia, the size of these connectors is frequently specified using a format that includes the outer diameter, inner diameter, and the length of the barrel.
Key Measurement Dimensions
The standard format commonly used for specifying DC jack sizes is:
OD × ID × L
Where:
- OD stands for Outer Diameter: This is the measurement across the widest part of the barrel of the jack.
- ID stands for Inner Diameter: This is the measurement across the central pin or hole within the barrel of the jack.
- L stands for Length: This is the length of the barrel of the jack.
These dimensions are typically expressed in millimeters (mm).
Understanding the Measurements
Ensuring that the dimensions of the DC jack precisely match the dimensions of the DC plug is crucial for a proper and secure connection.
- The outer diameter (OD) of the jack must match the inner diameter of the plug's barrel.
- The inner diameter (ID) of the jack corresponds to the diameter of the plug's center pin.
- The length (L) of the barrel helps ensure the plug seats correctly within the jack, providing adequate contact and preventing damage.
Example Measurement Format
Here's how the measurements might look:
| Measurement | Description | Unit |
|---|---|---|
| OD | Outer Diameter | Millimeters |
| ID | Inner Diameter | Millimeters |
| L | Barrel Length | Millimeters |
A common size might be listed as 5.5 mm × 2.1 mm × 9.5 mm. This means the jack has an outer diameter of 5.5 mm, an inner diameter designed for a 2.1 mm pin, and a barrel length of 9.5 mm.
Manufacturer Variations
It is important to note, as mentioned by Wikipedia, that designations may vary between manufacturers. While the OD × ID × L format in millimeters is common, you might encounter slightly different ways of specifying sizes or additional parameters depending on the vendor or specific connector type. Always verify the exact specifications required for your application.
