FUTEK IPM600 (D610) Digital Display User Manual

Page 61

7.HOLD FUNCTIONS

7-2. Hold Setting --- relative maximum and relative minimum ---

If you select the relative maximum and relative minimum hold in the hold function
setting, set the relative maximum and relative minimum value detection parameters
"minimum count" and "valley detection level".
Set referring to the principle of operation only when the value cannot be held
successfully with the factory settings or when further adjustments are required.

Detection of the relative maximum value and relative minimum value

The logic of detecting the relative maximum value and relative minimum value is given

below.

First, when difference X between point

A and point B is larger than the

minimum count, point A is judged to be

the relative maximum value and point B

is judged to be the relative minimum

value.

When difference X between detected

relative maximum value A and relative

minimum value B exceeds the

predetermined detection levels (1.5, 2,

and 3 times), A is displayed in the rela-

tive maximum value hold mode at

respective points O, P and Q and the

value is held.

If the minimum count is too small, when

the waveform includes noise as shown

on the left-hand side, the noise is

regarded as the relative maximum value

or relative minimum value and a correct

value may not be held. In such a case,

set the minimum count somewhat large.

1.5X

True relative maximum

True relative minimum

Relative

minimum

Relative
maximum