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	10ms	200ms
2ch	20ms	500ms
3～5ch	50ms	1s
6～10ch	100ms	1s
11～20ch	200ms	2s
21～50ch	500ms	5s
51～100ch	1s	10s
101～200ch	2s	20s

* The number of measurement channels is the number of channels for which the input setting is set other than Off.