About This Chapter
This chapter explains how you can control the
start and stop of measurements and what you
can obtain by doing so. The chapter starts by
explaining the keys and the functions behind
them, then gives some theory, and ends with
actual measurement examples.
Measurement Time
This parameter is only applicable to the func
-
tions Frequency and Period Average.In
-
creasing the measurement time gives more
digits, i.e. higher resolution, but fewer mea
-
surements per second. The default value is
200 ms but can be changed via SETTINGS
® Meas Time between 20 ns and 1000 s.
The default value gives 11 digits on the dis-
play and 4 to 5 measurements each second.
Varying the measurement time is a hardware-
based averaging method in contrast to the
software-based mean value function that can
be found in the STAT/PLOT menu.
The measurement time changes in 1/2/5 steps
if you use the arrow keys for stepping. By us
-
ing the numeric entry keys you can set any
value within the specified range with a resolu
-
tionof20ns.
+
To quickly select the lowest mea
-
surement time, enter 0. The
counter will select 20 ns auto
-
matically.
Gate Indicator
The GATE LED is on when the counter is
busy counting input cycles.
Single Measurements
SINGLE is implicitly the normal measure
-
ment mode, which means that the counter
shows the results from a single input cycle.
The exceptions are Frequency and Period
Average.
Single or Average is not relevant for V
max
,
V
min
or V
pp
measurements.
Hold/Run & Restart
Pressing HOLD completes the current mea
-
surement and freezes the result on the display.
Pressing RESTART initiates a new measure
-
ment.
If you are performing a statistics measurement
and press HOLD, the pending sample will be
finished. Then the measurement will stop, and
you can, for instance, watch the graphic repre-
sentation of the samples taken so far.
Pressing RESTART starts a new measurement
from sample 1, and the measurement will stop
when the preset number of samples has been
taken.
Arming
Arming gives you the opportunity to start and
stop a measurement when an external qualifier
event occurs.
Start and stop of the arming function can inde
-
pendently be set to positive slope, negative
slope, or it can be turned off. A delay between
10 ns and 2 s can be applied to the start arm
-
ing channel to facilitate certain measurements.
Theresolutionis10ns.
Input E on the rear panel is the normal arming
input, but also input A and input B can be
used. The frequency range for input E is
80 MHz, whereas it is 160 MHz for the other
inputs.
All the versatile arming functions can be
reached under SETTINGS ® Arm.
Measurement Control
5-2 About This Chapter
To Next Page
Loading...
