Operation; Introduction; Operating Characteristics; Operating Ranges - HP 5340A Operating And Service Manual

INTRODUCTION

3-1.
3-2. This section contains operating information including operating characteristics, input cable
considerations, controls and indicators, and operating procedures. Programming instructions
are contained in Section 11.

3-3. OPERATING CHARACTERISTICS

3-4. The following paragraphs describe the operating ranges and modes, resolution, sample rate,
AM and FM characteristics, and auto-amplitude discrimination.

3-5. Operating Ranges

3-6. There are two basic operating ranges available: 10 Hz to 250 MHz and 250 MHz to 18 GHz.
Frequencies in the lower range are measured directly while measurements in the 250 MHz to 18
three operating ranges, these are:
a. 10 Hz to 250 MHz at the BNC connector (1 MR, 25 pF).
b. 250 MHz to 18 GHz at the N connector (50R).
c. 10 Hz to 18 GHz at the N connector (50R).
3-7. The 10 Hz to 250 MHz range restricts the counter to direct measurements. The 250 MHz to
18 GHz range restricts the counter to the transfer oscillator mode, and the 10 Hz to 18 GHz range
allows both modes of operation to be in effect. Annunciator lights are included to indicate when
the counter is measuring directly (DIR light) or indirectly
during the 10 Hz to 18 GHz operation, the counter may lock on a signal in the 10 Hz to 250 MHz
range in preference to a signal in the transfer oscillator range. Thus, to measure a high frequency
signal (>250 MHz) containing high levels of residual low frequencies, it is necessary to select the
range. Otherwise,
250 to
18
ments and frequency of the input signal.

3-8. Resolution and Blanking

3-9. In a frequency counter, resolution can be defined as the value represented by the least,
significant digit (LSD). In the 5340A, a maximum resolution of 1 Hz can be selected. Decade
multiples of 1 Hz to 1 MHz are available. For example, with an input of 12,345,678 Hz, setting the
RESOLUTION switch to
LUTION switch places the 6 in the LSD. If
Hz resolution selected, the counter will overflow so that the 1 is not displayed and the 9 will
1
appear in the LSD. For ,high resolution of measurements which would result in a n overflow, two
measurements can be made.' The first measurement is made with a resolution setting that is
adequate display the mqst significant digits. The second measurement is made with maximum
to
resolution to display the l e a k significant digits.
I
3-10. The counter blanks all digits to the left of the most significant digit, suppressing lead-
ing zeros.
SECTION 111

OPERATION

switch position
the
1, the counter displays the 8 in the LSD. Selecting 100 on the RESO-
a frequency such as 123,456,789 Hz is measured with
(LOCK It
light). should be noted that
dictated the impedance require-
is
by
Model 5340A
Operation
3-1