19
3.2.5.3 Example of setting gate period in FREQCOUNTER mode.
To measure the frequency of an input signal on VCG SWEEP/COUNTER IN jack, use 2 gate periods, 0.1s and 10s.
Suppose the frequency of the input signal is 63,877,099Hz, the level is under 10V
p-p
.
Step1
Press the
COUNTER IN/VCG SWEEP
button. The
FREQCOUNTER
mode will
be engaged and the
COUNTER LED
will light. The rest of the LED indicating
working mode,
VCG SWEEP LED, INT LED and EXT LED
will not light.
Using a 0.01 s gate period will be the fastest period available. At high frequencies
values, there will be the highest counter error.
The content of the LCD display changes and it must look like Figure 22
Step 2
Pressing the
UP
button once will change the gate period to 0.1s. The
gate period will decrease to 0.1s and the count will be more accurate.
The content of the LCD display will change and it must look like
Figure 23.
Step 3
Pressing the
UP
button twice will change the gate period to 10s. The gate period will
decrease to 10 s and the count will be the most accurate available.
The content of the LCD display will changes and it must look like Figure 24.
3.2.5.4 Example of saving the active mode
This example will show the saving of the current configuration. See Figure 1 (beginning of section 3.2.), to see how the
LCD display will look like before starting the saving.
Step 1
Press both the range buttons,
UP and DOWN
at the same time. The LCD display
content will change, and it must look like Figure 25.
The unit is expecting the user to press the range buttons again at the same time.
63877102 Hz
Counter 0.01 s
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 22: LCD example of displaying measured
frequency using 0.01 s gate period
time
63877100 Hz
Counter 0.1 s
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure 23: LCD example of displaying measured
frequency using 0.01 s gate period
time
63877009 Hz
Counter 10 s
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure24: LCD example of displaying measured
frequency using 0.01 s gate period
time
Press again for
saving config.
FREQUENCY
RANGE (Hz)
LEVEL
Peak-to-Peak
(into 50
Ω
)
Figure25: LCD example of displaying the
initialization of saving current configuration
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