When data is recorded by external sampling, the amplitude of measured voltage and temperature is large or unstable.

If the AC line filter is set to Disable (Off) when external sampling is enabled (On), set it to Enabled (On) and measure at an external sampling interval higher than the fastest interval at which the digital filter is enabled.

The fastest interval is shown in the table below.

Measurement CH*	Fastest interval
	Digital filter “Off”	Digital filter “On”
1CH	5ms	200ms
2CH	10ms	500ms
3 to 4CH	20ms	1s
5CH	50ms	1s
6 to 10CH	50ms	1s
11 to 20CH	100ms	2s
21 to 50CH	200ms	5s
51 to 100CH	500ms	10s
101～200 CH	1s	20s

* The number of measurement channels is the number of channels whose input settings for the standard screw terminal, withstand 　　　

　high-voltage high-precision terminal, or screwless terminal are set to anything other than Off.