4.9 Self-Calibration
69
4
Chapter 4 Applied Measurement
The self-calibration function adjusts offset voltage and gain drift of the instru-
ment’s internal circuitry to improve measurement precision.
The instrument’s measurement accuracy specifications depend on self-calibra-
tion, so it must be executed frequently. In particular, always execute self-calibra-
tion after warm-up and when the ambient temperature changes by more than
2
°C. However, regardless of this setting, self-calibration is executed during
every measurement when SLOW sampling is used.
Self-calibration can be executed by the following two methods:
4.9 Self-Calibration
Auto Executes self-calibration automatically once every 30 minutes.
Manual Self-calibration can be executed manually by applying a CAL
input signal (shorting the CAL terminal to the ISO_COM of the
EXT I/O connector).
It can also be executed with the SYSTem:CALibration command.
( p.139)
1
(The SHIFT indicator lights up.)
The Menu display appears.
2
The Self-Calibration setting display appears.
See "1.4 Menu Display Sequence (SHIFT > ENTER)" ( p.13).
3
Select Auto or Manual on the sub display.
AUto ..... Auto self-calibration
in........... Manual self-calibration
4
Applies the setting and returns to the Measurement display.
(Main display)
(Sub display)
The current setting blinks.
Self-calibration requires about 176 ms (power supply frequency: 50 Hz) or
about 151 ms (power supply frequency: 60 Hz), during which measurement
processing is temporarily suspended.
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