RayTek MI Miniature Infrared Sensor - Manual (Page 51)

Operation
MI 43
6.4.5 Advanced Valley Hold
This function works similar to the advanced peak hold function,
except it will search the signal for a local minimum.
6.4.6 Advanced Peak Hold with Averaging
The output signal delivered by the advanced peak hold functions
tends to jump up and down. This is due to the fact, that only
maximum points of the otherwise homogenous trace will be shown.
The user may combine the functionality of the peak hold function
with the averaging function by choosing an average time, thus,
smoothing the output signal for convenient tracing.
Figure 29: Advanced Peak Hold with Averaging
The advanced peak hold function with averaging is only adjustable
by means of the DataTemp MultiDrop Software.
6.4.7 Advanced Valley Hold with Averaging
This function works similar to the advanced peak hold function with
averaging, except it will search the signal for a local minimum.
output temperature
object temperature
Temp
Time
without averaging