n
Settings
This key accesses a range of more sophisti
-
cated instrument settings that usually need not
be changed for basic measurements. The fig
-
ure below shows the display after recalling the
default settings via the USER OPT menu.
A detailed description of all the possibilities is
far beyond the scope of this introductory man
-
ual. See the User's Manual for full details on
functions mentioned and unmentioned here.
Meas Time
This value input menu is only useful if you se-
lect a frequency function. Longer measuring
time means fewer measurements per second
but gives higher resolution. You can change
the Measuring Time by entering a numerical
value, or you can use the UP/DOWN arrow
keys to increase or decrease the current value.
Burst
This settings menu facilitates measurements
on pulse-modulated signals and is only useful
if Frequency Burst is the main measurement
function.
Both the carrier frequency and the modulating
frequency – also known as the pulse repetition
frequency (PRF) – can be measured, often
without the support of an external arming sig
-
nal (see below).
Arm
Arming is the general term used for the means
to control the actual start or stop of a measure
-
ment. When arming is used, the normal
free-running mode is inhibited, and triggering
takes place only when certain pretrigger con
-
ditions are fulfilled.
The signal(s) used for initiating the arming
can be applied to three channels, and the start
channel can be different from the stop chan
-
nel. All conditions can be set via the menu
below.
Trigger Hold-Off
In this menu you can set the delay during
which the stop trigger conditions are ignored
after the measurement start. A typical use is to
clean up signals generated by bouncing relay
contacts.
Statistics
In this menu you can find the following
submenus:
•
No. of Samples: Set the number of sam
-
ples used for calculation of various sta
-
tistical measures.
•
No. of Bins: Set the number of bins
used in the histogram mode.
•
Pacing: Set the delay between succes
-
sive measurements, called Pacing
Time, to ON or OFF.
Operating the Counter
3-6 Description of Keys
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