Pendulum CNT-90 Series User Manual

Input Signaling Conditioning
■ Speed
The Auto-function measures amplitude and
calculates trigger level rapidly, but if you aim
at higher measurement speed without having
to sacrifice the benefits of automatic trigger-
ing, then use the
Auto Trig Low Freq func-
tion to set the lower frequency limit for volt-
age measurement.
If you know that the signal you
are interested
in always has a frequency higher than a cer-
tain value f
low , then you can enter this value
from a value input menu. The range for flo w is
1 Hz to 100 kHz, and the default value is 100
Hz. The higher value, the faster measurement
speed due to more rapid trigger level voltage
detection.
Even faster measurement speed can be
reached by setting the trigger levels
manually. See
Trig below.
Follow the instructions here to change the
low-frequency limit:
-
Press SETTINGS  Misc  Auto
Trig Low Freq.
-
Use the UP/DOWN arrow keys or the nu-
meric input keys to change the low fre-
quency limit to be used during the trigger
level calculation, (default 100 Hz).
-
Confirm your choice and leave the SET-
TINGS
menu by pressing EXIT/OK three
times.
Trig
Value input menu for entering the trigger
level manually.
Use the
UP/DOWN arrow keys or the numeric
input keys to set the trigger level.
A blinking underscore indicates the cursor po-
sition where the next digit will appear. The
LEFT arrow key is used for correction, i.e.
deleting the position preceding the current
cursor position.
Fig. 3-9
Value input menu for setting the trigger
level.
NOTE:
It
is probably easier to make small ad-
justments around a fixed value by using the
arrow
keys
for
incrementation
or
decrementation. Keep the keys depressed for
faster response
NOTE:
Switching over from AUTO to MAN Trigger
Level is automatic if you enter a trigger level
manually.
■ Auto Once
Converting "Auto" to "Fixed"
The trigger levels used by the auto trigger can
be frozen and turned into fixed trigger levels
simply by toggling the
MAN/AUTO key. The
current calculated trigger level that is visible
on the display under
Trig will be the new fixed
manual level. Subsequent measurements will
be considerably faster since the signal levels
are no longer monitored by the instrument.
You should not use this method if the signal
levels are unstable.
NOTE: You can use auto trigger on
one input and fixed trigger levels on
the other.
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
3-5

Pendulum CNT-90 Series Specifications

General

Brand	Pendulum
Model	CNT-90 Series
Category	Measuring Instruments
Language	English