Interactive SourceMeter® Instrument Reference Manual Section 3:
2461-901-01 A/November 2015 3-79
Switching control interfaces
When the access mode is set to anything other than Full, you need to log in to the instrument from
the 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 displayed
keyboard.
When you change the remote interface, you must send the following command before sending
commands:
login password
Replace password with the instrument password.
Relative offset
When 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 actual
measured value and the relative offset value. The formula to calculate the offset value is:
Displayed value = Actual measured value − Relative offset value
When a relative offset value is established for a measure function, the value is the same for all ranges
for that measure function. For example, if 5 V is set as the relative offset value on the 20 V range, the
relative 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 measured
value is displayed.
A relative offset value is saved for each function. If you change the measure function, the relative
offset 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 test
functions. For more information on the order in which operations are performed, see Displayed
measurements (on page 3-85).
You can perform the equivalent of relative offset manually by using the mx+b (on page 3-82) math
function. Set m to 1 and b to the value of the offset.
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