null  null
Electronic Counters
10 mHz to 18 GHz
R5372P
■ Measurement Range: 10 mHz to 18 GHz
■ Unique Method Enables Pulse Modulation Measurements
with 50 ns Pulse Width and 10 kHz Resolution
■ Pulse-Width Measurement to 10 ns Resolution
■ Enhanced Range of Calculation Functions
■ Automatic Measurement of Maximum FM Deviation
1
2
3
4
5
66
(Photo is R5372P)
8
9
10
11
12
13
14
15
16
R5372P
Microwave Frequency Counters
R5372P is high-resolution microwave frequency counters capable of pulse modulation measurements up to 18 GHz. Not only
are measurements of aircraft, harbor, river and fire prevention
radar possible but also, these counters are capable of CW microwave frequency measurements, totalizing functions and PCM
error–bit totalizing. Using the A input which makes use of a
reciprocal counting technique (10 mHz to 10 MHz), it is possible
to perform pulse width or pulse repetition frequency measurements to a resolution of 10 ns. By using an external trigger signal,
it is possible to measure a pulse modulated carrier frequency at
any desired point (frequency profile measurement).
These counters also provide high basic performance, typified by
an input sensitivity of –20 dBm at 18 GHz and 1 Hz resolution
with a 1 s gate using a digital TRAHET technique. In addition,
plus/minus offset display is possible using keyboard entry of any
or all digits, as are digital comparison functions, arithmetic
calculation result display and display of maximum values, minimum values, standard deviation and parts per million – all
provided as standard.
By building in an optional GPIB or BCD output capability, these
counters can be used in automated microwave measurement
systems.
■ High-Resolution Measurement of Pulse Modulated
Signals
To measure pulse modulated signals, the frequency counter’s gate
time must be set at or within the pulse width. The result with
conventional counters is that the readout accuracy suffers. The
R5372P microwave counters on the other hand, with their onboard CPUs and true averaging function can display three additional digits. Only the resolution need to be set manually; gate
time and number of averaging operations are automatically set.
The minimum measurable pulse width for pulse modulated
signals is 100 ns using an internal gate signal or 50 ns using an
external gate signal.
144
■ Frequency Measurement at any Desired Portion of a
Pulse Modulated Carrier
By inputting a TTL-level, negative logic, external gate signal at
the rear-panel connector; the carrier frequency of a chirp radar
can be measured at any desired frequency or pulse width and
provide a pulse modulated carrier frequency profile. Pulse
widths of 50 ns to 0.1 s can be measured. The resolution of the
measured frequency is set using the RESOLUTION keys on the
front panel.
■ Reciprocal Method Enables Pulse Width Measurement
Signal input at the A input (10 mHz to 10 MHz) is processed by
taking the reciprocal of the frequency to provide rapid, highresolution measurement of the pulse width and the pulse repetition frequency of a pulse modulated signal. The measurement
procedure is simple; just connect the rear-panel signal detection
output to input A.
Applications include measurement of the pulse width and repetition frequency of radar signals and of two-way radio pilot signals.
DC coupling allows PCM error bit accumulation as well.
■ FM Deviation Measurements Are Simple
FPU and STL testing of TV relay equipment requires measurements of transmitted output and frequencies as well as FM
deviation measurements. The ∆F mode of the R5372P can be used
to perform easily deviation measurements of FM modulated
frequencies and by means of an external trigger signal is also
possible.
Electronic Counters
Automatic Measurement of Pulse Microwave Signals
R5372P
■ Pulse Modulated Signal Measurement
■ FM Deviation Measurement
The R5372P microwave counters feature straightforward operating procedures to measure the important characteristics of
radar and other pulse modulated signals. The examples below
illustrate measurement of a carrier signal at 9450 MHz with a
pulse repetition frequency of 3210 Hz and pulse width of 100
ns.
The R5372P’s powerful arithmetic functions make it a simple
task to measure FM deviation. Connect the counter as shown
in the figure below and select the ∆F mode. It is then possible
to simply turn the delay knob to determine the maximum and
minimum values from the start of measurement and internally
calculate the differences later.
An external gate signal (50 ns to 0.1 s) synced at any desired
amplitude with the modulated signal can also be used for highaccuracy measurement of FM deviation (the frequency change
vs amplitude in frequency modulated signals). Specifically,
when the required resolution cannot be obtained due to reduced external gate time (50 ns min.), the averaging mode can
be used to obtain high-resolution measurements. This is
another application of the enhanced arithmetic functions of
these counters.
1. Carrier Frequency Measurement
With the R5372P in the manual mode, set the frequency to
9450.5 MHz, approximating the frequency to be measured
(within 9450.5 ± 125 MHz) and set the sample rate to HOLD.
Switch the sync mode to internal (rear panel INT. connector)
so that if the first gate time value is too short to obtain the
required resolution, internal averaging will be performed
automatically.
2. Repetition Frequency Measurement
After performing the same procedure as for carrier frequency, use either the detected output from the AUX IN/
OUT connector at the rear panel or provide a signal from an
external detector. Input this signal to the input A connector
of the R5372P. Set the input A to the 10 mHz to 10 MHz
measurement band (reciprocal mode) to obtain a measurement result of 3210.2 Hz in approximately 3 ms with high
resolution. This mode overrides the hold on the sampling
rate.
fmax. fmin.
fmax. fmin.
1
2
3
4
5
Modulated
signal from
STL or FPU
T
Signal
generator
output
STL or FPU
6
Delay
R5372P
gate
3. Pulse Width Measurement
To measure pulse width, set up the counter as for carrier
frequency measurement and press the SHIFT and PW keys
to obtain a measurement with 10 ns resolution. When
measuring pulse modulated signals having a long rise time,
the displayed pulse width may exceed the actual pulse
width because the pulse width is measured by measuring
the threshold level width of the counter. In such cases,
connect the output of a detector to input A and adjust the
trigger level to enable measurement of the 50% pulse width.
F
8
Delay
Counter trigger point
R5372P
SIGNAL
GENERATOR
9
EXT
START
input
10
Measurement of FM Deviation
11
12
AUX IN/OUT
(Detection output)
Fx
R5372P
13
0dBm max.(peak)
Power
divider
Input A
AUX IN/OUT
Signal(TTL level)
Input B
ATT
Waveform
detector
14
Directional coupler
Rader
transmitter
External gate signal
(pulse eidth 50 ns to 0.1s)
15
R5372P
Input signal(Fx)
Measurement of Pulse Modulated Wave
16
Frequency measurement at desired point in pulse
by external gate (resolution set at panel)
145
Electronic Counters
10 mHz to 18 GHz
R5372P
(Continued From Previous Page)
Specifications
Input
1
Input A
10 mHz to 10 MHz (DC coupled),
Frequency measurement range
2
10 Hz to 10 MHz (AC coupled)
Input B
10 MHz to 550 MHz
500 MHz to 18 GHz
Input impedance
Approx. 1 MΩ/60 pF max.
Approx. 50 Ω
Approx. 50 Ω
Input sensitivity
25 mVrms
25 mVrms
–20 dBm (500 MHz to 18 GHz)
Input attenuator
Maximum measurement input
3
0 dB, 20 dB
ANS
AUTO, 20 dB
500 mVrms/ATT.0 dB
500 mVrms/ANS OFF
0 dBm (ATT.AUTO)
5 Vrms/ATT.20 dB
5 Vrms/ANS ON
+10 dBm (ATT. 20 dB)
6 Vrms (1 MHz to 10 MHz)
Damage level input
10 Vrms (400 Hz to 1 MHz)
6 Vrms
100 Vrms (DC to 400 Hz)
Coupling
4
DC and AC
Trigger level
5
(when –10 V to +10 V/ATT. 20 dB)
See Fig. 1
±Trigger error*/no. of measurement cycles±1 count ±
Measurement accuracy
+20 dBm/ATT.20 dB
AC
Approx. –1 V to 1V continuously variable
Resolution / counting time
+10 dBm/ATT. AUTO
time base accuracy (See Fig. 1 for measurement cycles)
AC
–
–
10 MHz/0.1 µs to 0.1 Hz/10 s decade switched
10 MHz/0.1 µs to 0.1 Hz/10 s decade switched
±1 count ± time base accuracy
±1 count ± time base accuracy ± residual stability
Residual stability: 1/10 ¥ Measured frequency (GHz) (counts rms)
Digital TRAHET
Measurement method
66
Reciprocal
Direct counting
Input connector
BNC
Heterodyne converted direct counting
N-type
* Trigger error: ±0.3% with respect to sinewave input of 40 dB or higher S/N
8
Number of measuring periods
100
101
102
103
104
100
Measuring time(s)
9
10
105
106
107 (Resolution)
(0.1mHz)
(1mHz)
10
(10mHz)
(0.1Hz)
3.3
1
(0.1mHz)
0.33
(1Hz)
0.1
33m
(10Hz)
10m
(100 Hz)
3.3m
11
10m
0.1
1
10
100
1k
10k 100k
300
3k
30k
300k
10M
3M
Input frequency(Hz)
12
Maximum resolution: MSD 1 to 2: 9-digit display
MSD 3 to 9: 8-digit display
(resolution up to 0.1 mHz)
Fig. 1 Measuring Time, Resolution and Number of
Cycles vs Input Frequency
13
14
15
16
Totalize: (Input A 10 mHz to 10 MHz band)
Counting range: DC to 10 MHz
Counting capacity: 0 to 9,999,999,999
Pulse width measurement: (Input A 10 mHz to 10 MHz band)
Range: 50 ns to 1 s (resolution 10 ns, average of 10 pulses)
Units: µs (fixed display)
Accuracy: ± trigger error √10 ± 1 count ± time base accuracy
Trigger error;
0.0025
(µs)
Signal slope (V/µs)
2 × Peak noise voltage
±
(µs)
Signal slope
Pulse Modulation Measurement (MANUAL mode)
Measurement ranges:
10 MHz to 550 MHz (INPUT A)
500 MHz to 18 GHz (INPUT B)
146
Pulse width: 100 ns to 0.1 s (internal syncing)
50 ns to 0.1 s (external syncing)
Pulse repetition frequency (fR): 10 Hz to 5 MHz
Syncing trigger modes:
INT. Internal syncing. Gate is opened and closed in sync with a pulse
modulation of the input.
EXT. START Gate is opened when an external start signal is received.
Triggering is only possible when an internal detector output is on.
Trigger input signal (sinewave also usable):
1.5V ± (2 to 10) Vp-p
Pulse width; 1 µs min.
EXT. GATE Gate opens and closes when an external gate signal is
received.
Gate input signal level: TTL, negative logic
Pulse width: 50 ns to 0.1 s
LINE Gate opens in sync with power-line frequency. Triggering is only
possible when an internal detector output is on.
Carrier frequency measurement:
Maximum resolution See Fig. 2.
Accuracy GW < 200 µs;
0.04
± 1 count ± time base accuracy ± GW (Hz rms) ± 5kHz
GW ≥ 200µs;
1
± 1 count ± time base accuracy ± GW (Hz rms)
1
1
1
Measurement time (50 µs + f ) × ( RESOLUTION × GW )2
R
GW; Gate width (for internal syncing, this is the modulation pulse
width minus approx. 50 ns)
fR; Pulse repetition frequency
Units display GHz, MHz, kHz, Hz, fixed display
Modulation pulse width measurement:
Pulse width display at the counter input sensitivity level
Resolution: 10 ns
Accuracy: ± 30 ns ± time base accuracy
Units: µs fixed display
Electronic Counters
Automatic Measurement of Pulse Microwave Signals
R5372P
MANUAL: Manual key settings of fixed frequency band; no
capture action
Bandwidth (FM tolerance)
±125 MHz or more (1.4 GHz to 18 GHz)
±25 MHz or more (0.5 GHz to 1.4 GHz)
Sample rate: 50 ms to 5 s continuously variable or HOLD
Delay time: 25 µs to 30 ms continuously variable or OFF (from INT/
EXT/LINE trigger until count begins)
Memory backup: Backup is provided when power is supplied from AC
line. When power cable is disconnected, approximately two weeks’
backup is available from built-in Ni-Cd batteries. Full charging of
batteries requires 2 to 3 days.
Auxiliary input/output: Supports gate signal output, wave detection
output, external reset signal input and measurement completed
signal output; input/output level, 14-pin TTL connector equivalent
to Amphenol 57-40140.
Display: 12-digit fixed-point, 7-segment green LED decimal display
with memory; character height approx. 11 mm
Operating conditions: 0 to 40°C, 85% relative humidity (maximum)
Storage temperature range: –20 to +60°C
Power requirement: Specified at time of ordering
10M
1M
Previous model
Maximum resolution(Hz)
100k
10k
R5372P/5373P
1k
100
10
1
0.1
0.1µ
0.05µ
1µ
10µ
0.5µ
100µ
1m
10m
100m
Pulse width(s)
Fig. 2 Pulse Width vs Maximum Resolution
Option No.
Standard
Option 32
Option 42
Option 44
Power supply voltage
90 to 110 V
108 to 132 V
198 to 242 V
216 to 250 V
1
2
3
4
5
6
48 to 66 Hz
Power consumption: 120 VA (maximum)
External dimensions: Approx. 255 (W) × 132 (H) × 420 (D) mm
Mass: 10 kg (maximum)
Time Bases
Time base stability:
Standard
Aging rate
Long-term stability
Temperature characteristic (+25 ± 25°C)
Option 21
Option 22
Option 23
2 × 10–8/day
5 × 10–9/day
2 × 10–9/day
5 × 10–10/day
8 × 10–8/mo.
5 × 10–8/mo.
2 × 10–8/mo.
1 × 10–8/mo.
1 × 10–7/yr
8 × 10–8/yr
5 × 10–8/yr
2 × 10–8/yr
±5 × 10
±5 × 10
±1 × 10
±5 × 10
–8
–8
–8
–9
Time base output: Frequency 10 MHz
Voltage 1 Vp-p (minimum)
Output impedance Approx. 50 Ω, BNC connector
External frequency standard input: 1, 2, 2.5, 5 or 10 MHz
Voltage 1 to 10 Vp-p
Input impedance Approx. 500 Ω, BNC connector
Calculation Functions
•
•
•
•
•
•
•
•
•
Digital comparator function (limits set using keyboard)
Maximum & minimum value hold
Deviation measurement (deviation, maximum, minimum)
Standard deviation
Averaging
PPM
Offset display, drift display
Scaling display
Sum and difference display by automatic measurement of
Inputs A and B
• Harmonic frequency display
• Arithmetic functions
General Specifications
Measuring modes (Input B):
AUTO: Automatic mode with capture time of approx. 300 ms (from
reset until count begins)
FM tolerance 10 MHzp-p (minimum)
8
Accessories
Item
Model
Power cable
A01402
Input cable
A01036-1500
Input cable
MI-04
Product code
Remarks
9
BNC-BNC
N-N
10
Options
(These options may be added after delivery of the unit by factory retrofitting.)
(Either Option 01 or option 02 (not both) can be selected .)
Option 01: GPIB interface (IEEE 488-1978)
Function Output of displayed data and remote control of front
panel key settings
Option 02: BCD data output
Function Parallel output of the nine least significant digits in
binary-coded-decimal form; can be connected to Digital Recorder
with 50-pin connector equivalent to Amphenol 57-40500
11
12
Specifications common to Options 01 and 02:
D/A converter analog output: (From AUX IN/OUT connector)
Digits converted: 3 least significant digits
Output voltage: –4.995 V to +4.995 V ± 20 mV (+23° ± 5°C)
Output impedance: 100 Ω (maximum)
Digital comparator output: (From AUX INPUT/OUTPUT
connector) TTL negative logic, open collector
13
Option 21, 22 and 23: Time base oscillator
(See Time Base Stability chart above left)
15
14
Accessories (Sold separately)
R16058
A02448
A02248
Transit Case
EIA Rack Mount Set
JIS Rack Mount Set
16
147
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement