Making Measurements - Keysight U2722A User Manual

2 Operation and Features

Making measurements

The U2722A/U2723A has an excellent output voltage and current measurement
capability. All the measurements are performed by digitizing the instantaneous
output voltage or current for a defined number of samples and sample interval,
storing the results in a buffer, and then calculating the measured result. The
programmable parameters include the number of samples and time interval
between each sample.
There is a trade-off between the programmable parameters and the speed,
NOTE
accuracy, and stability of the measurements in the presence of noise.
Voltage and current measurements
To measure the voltage or current for any output, use the following commands.
MEAS:VOLT? (@<ch>)
MEAS:CURR? (@<ch>)
The result of MEAS:CURR? or MEAS:VOLT? is dependent on
– NPLC setting for voltage or current
– line frequency selection (SYSTem:LFREQuency <F50HZ|F60HZ>, (@1|2|3))
– latency time from many executable levels in the PC.
The maximum total time taken for measurements to complete if NPLC = 255 and
Line Frequency = 50 Hz is calculated according to the following formula.
Aperture time =
48
(SENSe:VOLTage[:DC]:NPLCycles <integer>, (@1|2|3) or
SENSe:CURRent[:DC]:NPLCycles <integer>, (@1|2|3)) where integer is
from 0 to 255
prior to making the measurement
Line frequency
255
NPLC
=
50
Keysight U2722A/U2723A User's Guide
= 5.1 s