| Model |  VSP6020 |  VSP4030 |  1796 |  1795 |  1794 |  1790 |  1692 |  1690 |  1689 |  1688A |  1686A |
| Description | DC Power Supply, Switch Mode, Single Output, 0-60V, 0-20A, RS232 Interface, Digital Display | DC Power Supply, Switch Mode, Single Output, 0-40V, 0-30A, RS232 Interface, Digital Display | DC Power Supply, Single Output, 0-16V, 0-50A, Digital Display | DC Power Supply, Single Output, 0-64V, 0-15A, Digital Display | DC Power Supply, Single Output, 0-32V, 0-30A, Digital Display | DC Power Supply, Single Output, 0-32V, 0-20A, Digital Display | DC Power Supply, Switch Mode, Single Output, 3-15V, 40A, Digital Display | DC Power Supply, Single Output, 1-15V, 28A, Digital Display | DC Power Supply, Single Output, 1-15V, 28A, Analog Display | DC Power Supply, Single Output, 3-14V, 4.5-20A, Analog Display | DC Power Supply, Single Output, 3-14V, 2.5-12A, Analog Display |
| Output (Volts) | 0-60V | 0-40V | 0-16V | 0-64V | 0-32V | 0-32V | 3-15V or 13.8V fixed | 1-15V | 1-15V | 3-14V | 3-14V |
| Output (Amps) | 0-20A | 0-30A | 0-50A | 0-15A | 0-30A | 0-20A | 40A | 28A | 28A | 4.5-20A | 2.5-12A |
| Ripple & Noise | 10mVrms | 10mVrms | 1mVrms | 1mVrms | 1mVrms | <= 1mVrms | <= 10mVrms | 5mV | 5mV | <= 10mVrms | <= 10mVrms |
| Metering | Dual Digital | Dual Digital | Dual Digital | Dual Digital | Dual Digital | Single Digital | Dual Digital | Dual Digital | Dual Analog | Dual Analog | Dual Analog |
| Manufacturer's Warranty | 1-year | 1-year | 2-year | 2-year | 2-year | 2-year | 1-year | 1-year | 1-year | 1-year | 1-year |