Model 2461 Interactive SourceMeter® Instrument Reference Manual Section 3: Functions and features2461-901-01 A/November 2015 3-79Switching control interfacesWhen the access mode is set to anything other than Full, you need to log in to the instrument fromthe new interface before you can change any settings.If you are changing to the front panel, when you attempt to make a selection, the Display Lockout -Enter Password keypad is displayed. Enter the password and select the OK button on the displayedkeyboard.When you change the remote interface, you must send the following command before sendingcommands:login passwordReplace password with the instrument password.Relative offsetWhen making measurements, you may want to subtract an offset value from a measurement.The relative offset feature subtracts a set value or a baseline reading from measurement readings.When you enable relative offset, all measurements are recorded as the difference between the actualmeasured value and the relative offset value. The formula to calculate the offset value is:Displayed value = Actual measured value − Relative offset valueWhen a relative offset value is established for a measure function, the value is the same for all rangesfor that measure function. For example, if 5 V is set as the relative offset value on the 20 V range, therelative offset value is also 5 V on the 7 V and 10 V ranges.On the front panel, when relative offset is enabled, the REL indicator to the right of the measuredvalue is displayed.A relative offset value is saved for each function. If you change the measure function, the relativeoffset value is changed to the setting for that measure function.The relative offset is applied to the measurement after any math functions but before the limit testfunctions. For more information on the order in which operations are performed, see Displayedmeasurements (on page 3-85).You can perform the equivalent of relative offset manually by using the mx+b (on page 3-82) mathfunction. Set m to 1 and b to the value of the offset.
