Measurement Timing Adjustment Using the Measurement Delay
(See section 7.5 for the procedure)
Measurement delay is the wait time from when a measurement trigger is applied to
when the measurement operation is carried out. You can adjust the timing between
the measurement trigger and the measurement operation by changing this setting.
For example, you can set the time needed for the DUT to stabilize after the source is
changed, so that measurement is performed at a stabilized point.
Highly Accurate Measurement and High-Speed Measurement
Certain measurement conditions allow highly accurate measurements or high-speed
measurements depending on the settings. Note the following points when setting the
GS820.
Local Sense and Remote Sense
(See section 4.5 for the procedure)
Two wiring systems, 2W (two-terminal connection or local sense) and 4W (four-terminal
connection or remote sense), are available (see page 2-11).
Four-terminal connection (4W) is effective when the current to be supplied is large
and the voltage that appears across the DUT is small such as in a low resistance
measurement or when measuring the resistance with high accuracy.
Integration time
(See section 7.4 for the procedure)
An integrating A/D converter is used for the measurement. If you set a long integration
time, the measurement takes longer, but the stability of the measured values increases.
If the integration time is set to an integer multiple of the power line cycle (nPLC), it has an
effect of eliminating the line frequency noise. To perform a highly accurate measurement,
set an integer value.
Offset Calibration Function
(See section 7.7 for the procedure)
Auto Zero Function
If the auto zero function is turned ON, the GS820 measures the internal zero reference
for each measurement. The measured result is obtained by subtracting this value from
the measured value canceling the offset drift of the measurement circuit in the GS820.
However, if the auto zero function is ON, measurement is performed twice. Therefore,
the measurement time is approximately twice the measurement time when the auto zero
function is OFF. If speed takes precedence over accuracy, turn the auto zero function
OFF.
Zero Calibration (Manual Zero) Function
If zero calibration is executed, the zero reference is measured on all measurement
ranges and applied to subsequent measured results. If you are using the GS820 with
the auto zero function turned OFF, execute zero calibration between measurement
sequences as necessary.
2.4 Measurement
2-18
IM 765601-01E
