Introduction
Three different ways to process a measuring
result are available: Averaging, Mathematics
and Statistics. They can be used separately or
all together.
In addition to postprocessing you can also
monitor the measurement results in real time
by setting limits and deciding how to react
when they are crossed.
Averaging
Hardware averaging by means of counting
clock pulses during several full input signal
cycles is only used for the measurement func-
tions Frequency and Period Average. The
parameter to be set by the operator in this case
is Meas Time under SETTINGS, and the range
is 20 ns to 1000 s. Longer measuring times
mean higher resolution.
The other functions employ single cycle mea-
suring, and the method to get average results
is to utilize the statistics features described
later.
Mathematics
The counter can use five
mathematical expressions to process the
measurement
result before it is displayed:
1. K*X+L
2. K/X+L
3. (K*X+L)/M
4. (K/X+L)/M
5. X/M-1
Press MATH/LIM Math to enter the first
mathematics submenu. See page 2-14 how to
enter the constants K, L and M and how to
select the formula that best suits your need.
The default values of K, L and M are chosen
so that the measurement result is not affected
directly after activating
Math. Recalling the
default setting will restore these values as
well.
If you want to observe the deviation from a
certain initial frequency instead of the abso-
lute frequency itself, you can do like this:
Recall the default settings by pressing
USER OPT Save/Recall Recall
Setup Default.
Connect the signal to be measured to
Press AUTO SET to let the counter find
the optimum trigger conditions on its
If the current display value is suitable
for your purpose, then press X
0
. It will
then be transferred to the constant L.
You can repeat pressing
X
0
until you are
satisfied. The constant will be updated
with the latest measurement result.
Instead of using X
0
you can enter any nu-
merical value from the front panel. Let's
assume that 10 MHz is your reference
frequency. The mantissa is marked by
text inversion for immediate editing.
Press
1 0 ± EE 6.
Confirm by pressing EXIT/OK. Now the
constant L is updated and displayed as
Press Math and choose the expression
K*X+L by pressing the softkey below it.
Now the display will show the deviation
from the value you have just entered.
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
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