Series 2280 Precision Measurement DC Power Supplies Reference Manual Section 2: General operation077085501 / February 2015 2-67To select measurement autoranging using the front panel home screen:1. Press the HOME key.2. Press the soft key under Range. The Range dialog box is displayed.3. Select AUTO. The home screen is displayed with autoranging enabled.To select measurement autoranging using the front panel Measure Settings screen:1. Press the MENU key.2. Under Measure, select Settings.3. Select the button next to Range. The Range dialog box is displayed.4. Select AUTO.To select measurement autoranging using SCPI commands:To set the current measurement range, send the command::SENSe:CURRent:RANGe:AUTO ONTo set the concurrent measurement range, replace CURRent with CONCurrent.ProtectionThe Series 2280 provides several methods for ensuring that the source remains within certain values.This helps to protect the device under test (DUT) from damage.The protection settings that affect the source are: Overvoltage protection (on page 2-67). This is the voltage at the instrument terminals. Overcurrent protection (on page 2-68). This is the current at the instrument terminals. Maximum voltage limits (on page 2-70). This is the sourced voltage value at the device.The Series 2280 also provides overtemperature protection to prevent damaging heat build-up.Overvoltage protectionOvervoltage protection restricts the maximum voltage level that the instrument can source. Thisprotects the device under test (DUT) from high voltage levels.For example, if a sense lead is disconnected or broken during a 4-wire sense measurement, theinstrument can interpret the missing sense lead as a decrease in voltage and respond by increasingthe source output. If overvoltage protection is set, the sourced output is not allowed to exceed theovervoltage protection limit.When overvoltage protection is set and the sourced voltage exceeds the setting: The output is turned off. On the home screen, an indicator to the right of the voltage displays OVP. An error is generated. For more information, refer to Overprotection error (on page 2-70).When overvoltage protection is used in a test sequence, it should be set before turning the source on.