Tektronix Keithley 2281 Series Reference Manual page 45

Section 2: General operation
Measure menu for the power supply function
The menus organized under Measure in the main menu allow you to select, configure, and perform
measure operations from the 2281S front panel. The following topics describe the settings that are
available on these interactive screens.
Measure Settings menu for the power supply function
This menu contains settings for the presently selected measurement function, which is identified by
the Type indicator in the upper right corner of the menu. The line frequency is also shown here.
Setting
Function
Range
Digits
Auto Zero
NPLC
Power Line Freq
2-22
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Description
Select which type of measurement is active:

V + I: Concurrent measurement function. The instrument measures
voltage and current at the same time.

V: Voltage measurement function. The instrument only measures
voltage.

I: Current measurement function. The instrument only measures
current.
Set the measurement range for the selected measurement function.
Select the display digits: 6½, 5½, or 4½ digits.
Set Auto Zero to On so that the instrument periodically gets new
measurements of its internal ground and voltage reference. This setting
increases measurement accuracy, but may slow measurement time.
Set the amount of time that the input signal is measured. A lower number of
power line cycles (NPLCs) results in faster reading rates, but increased
noise. A higher number of NPLCs results in lower reading noise, but slower
reading rates.
Shows the present power line frequency setting (read only).
077114601 / March 2019