问题：
What is the difference between the 2230 and 2230G?
答案：
The G designation in Keithley power supply model numbers indicates that the power supply has a built-in GPIB port. However, some models might include a GPIB port without having a G in their model number. Check the instrument datasheet for the most accurate information.
These power supplies are generally identical, besides the 'G' model having a GPIB port. See the table for some otherwise equivalent models.
| without GPIB | with GPIB |
| 2220-30-1 | 2220G-30-1 |
| 2230-30-1 | 2230G-30-1 |
| 2230-30-3 | 2230G-30-3 |
| 2230-30-6 | 2230G-30-6 |
| 2230-60-3 | 2230G-60-3 |
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