Advantest Corporation R5373, R5372 Datasheet
Electronic Counters
10 mHz to 18 GHz/27 GHz
R5372/5373
■ Wide Selection
■ Digital TRAHET Technique
■ Wide FM Allowable Range
■ Digital Comparator Function and Wide Range of Built-In
Calculation Functions
R5372/5373
Microwave Frequency Counters
Recent research in communications and broadcast systems
using microwaves in applications such as broadcast satellites,
telephone circuits and the new field of submillimeter microwave and millimeter-wave communications systems have resulted in dramatic development in components and practical
product designs. This research and development work requires highly accurate frequency measurements. Previous
approaches to measure frequencies in these bands involved the
use of frequency converters or converting oscillators. These
methods, however, were difficult to use as it required troublesome tuning and calculations to determine the actual frequency.
T o solve these problems, ADVANTEST has employed a digital
TRAHET technique to achieve 1 Hz resolution with a gate time
of just one second. It enables not only frequency measurement
but the application of offset to frequency results and calculation of standard deviation, ppm, maximum values, minimum
values and other useful parameters. In addition, a digital
comparator has been provided and totalizing and measurements of the carrier frequency of pulse-modulated signals are
also possible.
(Photo is R5373)
■ Measurements up to the Microwave and Millimeter-
wave Bands
Measurement ranges extend from 10 mHz to 18 GHz for the
R5372 and 10 mHz to 27 GHz for the R5373. It enables a single
counter to be used for broadcast satellite, satellite communications, pilot-signal measurements for radio equipment and
many more diverse applications.
■ Reciprocal Counting Technique for High-Resolution
Measurements
The 10 mHz to 10 MHz mode for the A input uses a reciprocal
technique that calculates the frequency from the period of the
input signal, thereby achieving high resolution in a short
counting time. This enables high-resolution measurements of
the pulse width of pulse-modulated signals and of pulse
repetition frequencies. Making a measurement is as simple as
setting the required measurement resolution; the rest is automatic with extremely easy selection of number of displayed
digits, counting time and frequency.
Selection Guide
10mHz 1Hz 1MHz 1GHz 10GHz 100GHz
R5372
R5373
Measurement method
Major applications
174
10 mHz to 18 GHz
10 mHz to 27 GHz
Reciprocal Direct Counting Digital TRAHET
FM broadcasts
and VHF/UHF
broadcasts
SHF Broadcasts
Microwave circuits
Broadcast satellite
(BS)
Submillimeter-
wave circuits
Communications
50 GHz commercial
satellites (CS)
radio services
Electronic Counters
Ideal For Frequency Measurements Over a Wide Band Range
R5372/5373
■ Digital TRAHET T echnique for Microwave Frequency
Measurements
The digital TRAHET technique combines the advantages of
the transfer technique which provides relatively high-sensitivity measurements and the heterodyne technique which
provides high resolution. Implementing these under microprocessor control, a dramatic improvement in cost performance can be achieved. The frequency ranges covered are 500
MHz to 18 GHz (R5372), 500 MHz to 27 GHz (R5373). After
heterodyning using the digital TRAHET technique, direct
counting is used to provide 1 Hz resolu-tion in just 1 second.
■ Wide Allowable FM Range
Almost all microwave carrier signals are FM modulated by
noise and parasitic FM, demanding from a counter the
ability to tolerate a wide range of FM. In manual measurements, for a signal of 1.4 GHz or greater, these counters can
tolerate ±125 MHz or more. In the range 500 MHz to 1.4
GHz, they can tolerate up to ±25 MHz. For automatic
measurements, the tolerance for FM is 10 MHz
p-p in the worst case.
■ Calculation Functions and Digital Comparator
Provided as Standard
The R5372/5373 feature a built-in microprocessor which is
used not only to control the measurement system but to
simplify operations and perform calculations on measurement results as well.
Using these calculation functions, a moving difference display, scaling, 8–by–8 digit arithmetic operations and displays
of calculated measured values of A/B inputs and B/C inputs
are possible. These features greatly enhance versatility.
Key setting Description
MAX Maximum-value hold
MIN Minimum-value hold
∆ F Deviation (Defined as the difference between maximum and minimum values)
COMP Digital Comparator (GO/NO-GO test)
AVG Averaging (101 to 104 samples)
δ Standard deviation
ACQ Acquisition mode
TR TR4110 Series marker frequency measurement
MANL Manual acquisition mode
PPM Parts per million
TOT A A input totalize
CLR-KB Clear keyboard
x, ÷, OFS Arithmetic operation display
■ FM Deviation Measurements Are Simple
FPU and STL testing of TV relay equipment require measurements of transmitting output and frequencies as well as FM
deviation measurements. The ∆F mode can be used to perform
easy deviation measurements of FM modulated frequencies.
Measurement by means of an external trigger signal is also
possible.
■ Relay Station (STL or FPU) FM Deviation
Measurements
The R5372/5373 have a wide range of calculation functions
which greatly simplify FM deviation measurements. By using an
external signal to open a gate in sync, the ∆F mode is selected.
After this, the delay knob can be turned to perform automatic
internal calculation of the maximum and minimum values after
measurements are started. By using an external start signal (1 µs
min.) synced to an arbitrary amplitude point on a modulated
signal, it is possible to determine the frequency variation with
respect to amplitude of an FM-modulated (or other) signal.
■ Radio Equipment Frequency Measurements Using an
IF Offset Display
The R5372/5373 have an IF offset display function which can be
used to directly display the received frequency of a radio receiver. Simply input the IF fr equency of the heterodyne receiver
as an offset frequency from the keyboard and measure the local
oscillator frequency to directly display the received frequency.
The offset value can be set at any digit down to 0.1 Hz resolution
when setting in MHz units. For local oscillator frequencies
higher than the received frequency , the offset is simply input as
a negative value.
X
F
IF;30MHz
RECEIVER
F
L
R5372/5373
FX=FL+IF
■ High-Accuracy Frequency Measurements on Radio
Receivers
F
X
RECEIVER
FL
Local Frequency
IF
R5372/5373
FX=FL+IF
■ Measurement of Oscillating Frequencies In
Magnetrons For Microwave Ovens
Since magnetrons in microwave ovens usually employ intermittent oscillations synched to the power frequency , measurement
with conventional frequency counters has been extremely difficult. The R5372/5373 have a power sync mode to provide
accurate synchronization without external apparatus for measuring oscillating frequencies. By adjusting the delay knob, the
profile of the oscillating frequencies can also be measured.
Magnetron
Oscillating output
LINE sync signal
(Internal)
GATE OUT
Td : Delay
TG : Gate time
Measurement of oscillating frequencies in magnetrons
Td
Td
TG
175
Loading...