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Frequency Counter
1-5
When your signal source testing requires an accurate RF frequency counter,
the HP 8902A is a convenient solution. The HP 8902A makes it easy
to tune to and measure the frequency of complex modulated signals.
If you haven't setup your HP 8902A, Sensor Module, and signal generator as
shown in Diagram 1-1 (page 1-2) you will need to do so in order to perform
the following procedures.
Adjust Your Signal Generator
RF
Frequency
....................
100 MHz
Frequency Increment
............
.1 MHz
Amplitude
.......................
0.0 dBm
Modulation
......................
O f f
Measuring
1 .
RF Frequency
1 Hz Resolution
2.
I
Press the FREQ key and the green AUTOMATIC OPERATION key
on the HP 8902A.
That's all it takes to configure the HP 8902A as
an RF counter. Notice that the HP 8902A automatically tunes to and
displays the frequency of the input signal (approximately 100 MHz; the
absolute value depends on the accuracy of your signal generator and
the accuracy of the HP 8902A's time base reference.) Note also that
AUTO TUNING (the green
LED
on the front panel) is on. This LED
lets you know that the instrument is in its automatic tuning mode.
To increase the HP 8902A's display resolution to 1 Hz, key in
7.4
SPCL
*
by pressing the digit keys 7
0
4 and the
SPCL
key (see the
adjacent instrument diagram for key locations). If you enter a wrong
digit, simply press the CLEAR key and begin again. Note that the SPCL
key remains lit to show that a special function has been manually set.
If the HP 8902A displays Error
23 when you enter
7.4
SPCL, it
is not equipped
to provide 1 Hz counter resolution. Enter
7.1 SPCL instead to select 10 Hz
display resolution.
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