HP 8901B Operation And Calibration Manual page 69

Frequency Counter
1-5
Input
Frequency
Frequency
When your signal source testing requires an accurate RF frequency counter,
the HP 8901B is a convenient solution. The HP 8901B makes it easy
to tune to and measure the frequency of complex modulated signals.
Amplitude
Range
If you haven't set-up your HP 8901B, 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.
150 kHz to
650
MHz
650 MHz
to
1300 MHz
Adjust Your Signal Generator
-I-30
to -25 dBm
+30 to
-20 dBm
RF Frequency
....................
100 MHz
Frequency Increment
............
.1
MHz
Amplitude
.......................
0.0 dBm
Modulation
...................... O f f
RF
Measuring
1.
Press the
FREQ
key and the green
AUTOMATIC OPERATION
key
on the HP 8901B. That's all it takes to configure the HP 8901B as
an RF counter. Notice that the HP 8901B 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 8901Bs 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.
1 Hz Resolution
2.
To increase the HP 8901B'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 8901B displays Error 23 when you enter 7.4 SPCL,
it
i s not equipped
to
provide
1
Hz counter resolution. Enter 7.1 SPCL instead to select 10
Hz
display resolution.
Measurement Ranges
That's all it takes to make an accurate frequency count on a stable signal
throughout the following ranges: