Keithley 2280 Series Reference Manual

Series 2280 Precision DC Power Supply Reference Manual Section 4: Measurement optimization
077085503 / March 2019 4-3
Setting resolution
To set the resolution from the front panel:
1. Select the measurement function. The resolution setting will be applied to this function. For more
information, you can refer to Select a measurement function (on page 2-74).
2. Press the HOME key.
3. Press the Next soft key to switch to home screen 2.
4. Press the Resolution soft key.
5. Select one of the resolution values.
To set the resolution for the current, voltage, or concurrent function using SCPI commands:
SENse:CURRent:RESolution <n>
SENse:VOLTage:RESolution <n>
SENse:CONCurrent:RESolution <n>
Where <n> is:
4 = 4.5 digit resolution
5 = 5.5 digit resolution
6 = 6.5 digit resolution
NPLC
You can adjust the amount of time that the input signal is measured. Adjustments to the amount of
time affect the usable measurement resolution, the amount of reading noise, and the reading rate of
the instrument.
The amount of time is specified in parameters that are based on the number of power line cycles
(NPLCs). Each power line cycle for 60 Hz is 16.67 ms (1/60); for 50 Hz, it is 20 ms (1/50).
The shortest amount of time (0.002 PLCs) results in the fastest reading rate, but increases reading
noise and decreases the number of usable digits.
The longest amount of time (12 PLCs for 60 Hz and 15 PLCs for 50 Hz) provides the lowest reading
noise and more resolution, but has the slowest reading rate.
Settings between the fastest and slowest NPLCs are a compromise between speed and noise.

Keithley 2280 Series Specifications

General

Brand	Keithley
Model	2280 Series
Category	Power Supply
Language	English