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Operating Instructions
17
Using the
Peaking Aid
The peaking aid is useful for making adjustments to
optimize any of the parameters which the Model 4391A
measures. After the mode is selected, press the delta (
∆) key
momentarily. This blanks the least significant digit of the
display, and replaces it with a right-facing arrow head if the
measured quantity is increasing or a left-facing arrow head
if it is decreasing. If there is no change, the digit is left
blank. To find a peak, begin making the adjustment in
whichever direction produces a right-facing arrow and
continue slowly in that direction until the arrow head turns
around. At this point the peak has been reached. To check to
make sure the peak has not been passed, press the MAX key
to read the highest value read and release it to read the
current value. The two should be the same. Desired
minimum levels (e.g. of reflected power or of SWR) are found
in a similar manner.
Figure 13
Maximum or
Minimum
Readings
Figure 14
Peaking Aid
(
∆)