Ceyear 4024 Series User manual

4024D/E/F/G Spectrum Analyzer
9 kHz ~ 20 GHz / 26.5 GHz / 32 GHz / 44 GHz
Maintenance Manual

Product Overview
1.1 Features
The 4024 series spectrum analyzer embraces such advantages as wide working frequency band, high
performance indexes, high sweep speed, multiple test functions and easy operation. The integration of
8.4 inch LCD and capacitive touch screen improves the display definition and operation convenience.
The portable structure with small volume, light weight, flexible power supply and convenient
maneuverability makes it very suitable for on-site use. The main characteristics are as follows:
●Wide frequency range: 9 kHz - 44 GHz, with 4 models
●Extremely low displayed average noise level: Up to -163 dBm@1 Hz RBW (typical value)
●Excellent phase noise performance: -106 dBc/Hz@100 kHz frequency offset@1 GHz carrier
●High sweep speed: Min. sweep time at 1 GHz span <20 ms
●Resolution bandwidth: 1 Hz ~ 10 MHz
●Preamplifier in full frequency band: Standard configuration
●Multiple measurement function modes: Spectrum analysis, interference analysis (waterfall plot,
RSSI), simulation demodulation (AM/FM/PM), channel sweep, high-precision USB power
measurement, etc.
●Multiple intelligent measurement functions: Field intensity measurement, channel power, occupied
bandwidth, adjacent channel power, audio demodulation, carrier-to-noise ratio, emission mask, etc.
●Multiple auxiliary test interfaces: 10 MHz reference input/output interface, GPS antenna interface,
zero span IF output interface, external trigger input interface, etc.
●Convenient and fast user operation experience: 8.4 inch large screen of high brightness LCD and
large font display, integrated with capacitive touch screen, allowing convenient operation and
multiple display modes, etc.
●Working temperature range: -10℃ ~ 50℃.
●Power supply: battery or adapter.
1.2 Typical Applications
●On-site comprehensive performance evaluation of electronic weapon equipment
●On-site test and diagnosis of transmitter and receiver
●Broadband spectrum monitoring, interference identification

Working principle
The 4024 series spectrum analyzer consists of 4 mutually independent function modules with standard
interfaces, namely microwave/millimeter-wave frequency conversion module, frequency synthesis
module, IF signal processing module, and data processing, display and control module. Such a design
facilitates maintenance of the main unit and replacement of the parts, and also significantly reduces the
re-debugging workload of the main unit after the module replacement. The hardware scheme of the main
unit is as shown in Fig. 1.
Fig. 1 Diagram of Hardware of the Main Unit
2.1 Microwave/Millimeter-Wave Frequency Conversion Module
It is mainly used for receiving and down-conversion of the input signals of the microwave and
millimeter-wave frequency band. The input signals will enter the frequency conversion module through
the blocking module and 50 dB programmable step attenuator. The RF signals of 9kHz ~ 20 GHz and
broadband local oscillator signals of 6 GHz ~ 12 GHz (or its second harmonic) are mixed to produce
three second IF signals, namely 6,540.25 MHz of the first band (RF frequency is 9 kHz ~ 5.35 GHz),
1,740.25 MHz of the second band (RF frequency is 5.35 GHz ~ 13 GHz) and 3,340.25 MHz of third band
(RF frequency is 13 GHz ~ 20 GHz), and then output 140.25MHz IF signal to the IF channel plate
through down-conversion of the third-stage mixer. The signals above 20 GHz frequency band are mixed
with the first LO signal after the preamplifier and subsection switching filter to produce first IF signal (5
GHz ~ 16.5 GHz).The first IF signal and RF signals of 9kHz ~ 20 GHz are switched into the
second-stage mixer after switching by a single-pole double-throw switch, and the frequency conversion
scheme is the same as the 5 GHz ~ 16.5 GHz. The microwave/millimeter-wave frequency conversion
module directly affects the frequency conversion loss, noise factor, image frequency and off-band signal
suppression and gain compression of the main unit, which consists of the broadband
microwave/millimeter-wave switch, low-noise broadband preamplifier, high performance broadband
microwave/millimeter-wave mixer, microwave/millimeter-wave switch filter module, low power
consumption LO amplifier and multiplying circuit and microwave switch filter module.
2.2 Frequency Synthesis Module
Microwave/millimeter-
wave frequency
Program
mable
attenuator
Microwave switch
Low-pass filter
Second
-stage
mixer
IF amplifier
Third-stage
mixer
Filter
Switch filter
Second
-stage
mixer
IF amplifier
Third-stage
mixer
Filter
Frequency synthesis
module
Reference ring
Decimal ring
VCO ring of
the second
local oscillator
Sampling ring
IF signal processing
module
IF amplifier
Filter
Four-wave
mixer
AD
Data processing, display and
control module
FPGA
Microprocessor
Keyboard
LCD
Power supply
management
Second and third
local oscillators
Fourth local
oscillator
Switch filter
Second
-stage
mixer
IF amplifier
Filter
Millimeter-wave
downconverter
Multiplying filter
First local
oscillator
Input

The frequency synthesis module is mainly used to provide the required LO signals to the three mixers in
the microwave/millimeter-wave frequency conversion module and the fourth mixer in the IF signal
processing module. It consists of seven phase-lock loops of 5.3 GHz ~ 5.55 GHz first LO, 6 GHz ~ 12
GHz second LO, 3,200 MHz third LO and 109 MHz fourth LO, which will directly determine the phase
noise, sweep speed, sideband stray, etc. of the main unit.
2.3 IF Signal Processing Module
It is mainly used to carry out amplification and IF gain modulation of 140.25 MHz third IF signal output by
the microwave/millimeter-wave frequency conversion module, and then make it enter the acoustic
surface wave filter to suppress the out-of-band frequency, and obtain the fourth IF signal by mixing the
third IF signal after gain adjustment on the third IF channel with the fourth local oscillator and make it as
the AD converter input sampling signal. After AD sampling, it will output the LVDS level to the data
processing, display and control module for IF filtering, video detection, digital down-conversion and
video filtering, etc., and finally convert it to the testing curve and display it on the LCD.
2.4 Data Processing, Display and Control Module
It includes the switch power conversion, digital signal processing, display and touch screen driver, all
kinds of user input and output interfaces required by the main unit and logic control functions of each unit
circuit on the main unit. The data processing, display and control module is mainly used to control the
circuit of each module to complete the measurement of the spectrum analyzer and the processing and
display of the measurement data. It also includes auxiliary functions including the processing of
keyboard and touch screen input information, peripheral control, parameter transformation, data and
status storage and recall, measurement result output and cursor, as well as statistical analysis and
functional support of LAN and USB interfaces.

Analysis on common faults
3.1 Lighting failure of power indicator lamp
Fault cause: The keyboard has fault or the CPU board has communication fault
Instrument to be repaired: Digital display megawatt multimeter FLUKE 1508
Repair method:
1. Check whether the DC voltage output by the adapter is 14 V ~ 16 V;
2. If the adapter is normal, firstly replace the front cover assembly;
3. If the fault still exists after the front cover assembly is replaced, replace the CPU board.
3.2 No response of key
Fault cause: The keyboard has fault and the CPU board has communication fault.
Repair method:
1. Firstly check to see if each key of the main unit is stuck;
2. Check if the cable connection between the front cover assembly and the CPU board is normal;
3. If the cable is normally connected, replace the front cover assembly.
3.3 No zero frequency signal
Fault cause: The communication cable has connection fault or the microwave/millimeter-wave frequency
conversion module and frequency synthesis board have fault
Repair method:
1. Check if the semi-rigid cable and flexible cable in the main unit are reliably and correctly connected.
2. If the cable is normally connected, please replace the frequency synthesis board, and power it on
and check it for zero frequency.
3. Please replace the microwave/millimeter-wave frequency conversion module if the abnormality still
exists.
3.4 Frequency accuracy out of standard
Fault cause: The IF channel plate or frequency synthesis board has output fault
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1. Eliminate the cable connection reliability problem of the main unit.
2. Check if the frequency accuracy significantly changes in case of the internal reference input and the
external reference input respectively. If the frequency accuracy significantly changes, it shall be
determined that 100 MHz reference ring has fault, and the IF channel plate shall be replaced.
3. Please replace the frequency synthesis board if the fault still exists.
3.5 No signal detected when the pan smaller than 5 MHz, but normal when the span
is larger than 10 MHz
Fault cause: The frequency synthesis board has output fault
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1. Eliminate the cable connection problem.
2. Replace the frequency synthesis board.
3.6 Large deviation between the signal amplitude of a certain wave band and the
actual condition

Fault cause: The microwave/millimeter-wave frequency conversion module has output fault.
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1. Eliminate the cable connection fault.
2. Replace the microwave/millimeter-wave frequency conversion module.
3.7 SWR deviation at input port
Fault cause: The RF front end connection has fault or the connection cable has fault
Repair method:
1. Check if the connection cables between the RF input connector, blocking module and
programmable step attenuator are reliable or loose.
2. Please replace the blocking module and the connecting semi-rigid cable if the abnormality still
exists.
3.8 Phase noise deviation
Fault cause: The IF channel plate or frequency synthesis board has fault.
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1. Replace the IF plate, and verify whether 100 MHz reference ring has any problem or not.
2. If the fault is irrelated to the IF plate, it shall be deemed that the frequency synthesis board has local
oscillator phase noise index deviation, and the frequency synthesis board shall be replaced.
3.9 Abnormal attenuation control
Fault cause: The attenuator has communication fault
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1. Check if the communication cable of the attenuator is properly fixed and the metal clip is normally
installed .
2. Replace the rear cover assembly, and check whether the attenuation control is normal.
3. Replace the microwave/millimeter-wave frequency conversion module if the fault still exists.
3.10 No display for battery under charging and current charging capacity
Fault cause: The CPU board has fault
Repair method:
1. Maybe the battery is excessive discharged，please charge the battery for half an hour, and see if the
icon is correct.
2. If the display is still incorrect after charged for half an hour, remove the battery and see if the power
supply icon is the icon of the external power supply. If not, please replace the CPU board.

Repair of parts
When the 4024 series spectrum analyzer has any fault and the casing shall be opened to check the fault
cause or the spare parts and complete parts shall be replaced, please refer to the schematic diagram of
4024 structure decomposition, and remove and install it according to the instruction.
4024 Exploded View
Interface protection cover
LCD touch screen
Keyboard
Fan assembly
CPU board
Battery compartment
Frequency synthesis board
Attenuator mounting plate
Attenuator
Strap
Rear cover assembly
Front casing
Rubber key
Fixed plate assembly
IF channel plate
Battery
Microwave frequency conversion module
Blocking module
Battery cover assembly
Rear supporting assembly

4.1 Removal Process
1. Remove the battery cover assembly (17), and then remove the battery (11).
Fig. 2 Removal of Battery
2. Gently place the 4024 series spectrum analyzer on the table with back upwards, and remove eight
fixing screws (four on the back and four on the side) of the casing with a Phillips screwdriver.
Fig. 3 Removal of 6 Fixing Screws
3. Separate 4024 front casing from its rear casing (Attention: In this case, two parts of the casing are
connected by multiple cables, do not separate the casing forcibly). Firstly, remove one end of the
interconnecting cable between the front and rear casings, and then place them on the table. In case
of reassembly, pay attention to the relationship of the connection cables, as shown in the following
figure.

Fig. 4 Connection Cables between the Front and Rear casings
4. Remove the rear casing assembly:
Firstly, remove and replace the frequency synthesis board (12):
a) Firstly, remove 6 fixing screws of the frequency synthesis board (12) in the rear cover assembly
(19);
b) Loosen 3 semi-rigid cables between the frequency synthesis board (12) and the microwave
frequency conversion module (13);
c) Remove the interconnecting flat cable between the microwave frequency conversion module (13)
and the frequency synthesis board (12).
d) The installation process is reverse to the removal process.

Fig. 5 Removal of the Frequency Synthesis Board
The microwave frequency conversion module (13) after removal of the frequency synthesis board (12) is
as shown in the following figure. The removal and installation processes are as follows:
a) Remove 4 fixing screws between the microwave frequency conversion module (13) and the rear
cover assembly (19). Please note that two screws on the right side have two washers.
b) Remove the connection flat cable between the attenuator (15) and the microwave frequency
conversion module (13),
c) Remove the connection semi-rigid cable between the attenuator (15) and the microwave frequency
conversion module (13),
d) After the module is removed, the rest is the rear cover assembly (19).
e) The installation process is reverse to the removal process.
Fig. 6 Removal of the Microwave/Millimeter-wave Frequency Conversion Module
a. Remove 6 fixing screws
b. Loosen 3 semi-rigid cable
connectors
c. Remove 50-core cables
a. Remove 4 fixing screws
b. Remove 10-core cables
c. Loosen the semi-rigid cable connectors

5. Remove the front casing assembly:
Firstly, remove and replace the IF channel plate (7):
a) Remove 4 fixing screws of the IF channel plate (7),
b) Remove the interconnecting 50-core flat cables between the CPU board (9) and the IF channel
plate (7),
c) The installation process is reverse to the removal process.
Fig. 7 Removal of the IF Channel Plate
After that, remove and replace the CPU board (9):
a) Remove the interconnecting 50-core cables between the CPU board (9) and the keyboard (5),
b) Remove the connection cables between the CPU board (9) and 2 fan components (8),
c) Remove 4 fixing screws of the CPU board (9), and then remove the CPU board (9),
d) Remove the connection cable of the battery compartment (10) at the back.
e) The installation process is reverse to the removal process.
Fig. 8 Removal of the CPU Board
a. Remove 4 fixing screws
b. Remove 50-core cables
a. Remove 50-core cables
b. Remove 2 fan cables
c. Remove 4 fixing screws
d. Remove 6-core cables
at the back

Calibration of the main unit
The parameters of the main unit will be changed when the rear casing assembly is replaced. In this
case, recalibration is required, including temperature compensation and automatic test of indicators.
5.1 Temperature Compensation
1. Software environment
Name of the
software
Version
Description
Windows system
Win7/XP
The compensation software operating environment needs GPIB
driver and Visa library
TempComp.exe
1.1.0
Temperature compensation software
NI-GPIB driver.rar
GPIB-USB-HS
NI GPIB driver installation package
visa462full.exe
4.6.2
Visa library installation package
2. Hardware environment
a) Firstly connect the signal generator with the power meter through the GPIB cable, connect the GPIB
Instrument
name
Main technical indicators
Recommended
model
Manufacturer
Synthesized
signal
generator
Frequency range: 250 kHz ~ 50
GHz
Power output: -100 dBm ~ +15
dBm
Frequency accuracy: ±0.02％
The power level can be calibrated
and stored
It has internal and external AM
modes and low frequency output
function
1465H (with 90
dB
programmable
step attenuator
option)
Ceyear
Power meter
Frequency range: 50MHz ~
67GHz
Power range: -60 dBm ~ +20 dBm
2438CB
Ceyear
Power sensor
Frequency range: 50MHz ~
67GHz
Power range: -60 dBm ~ +20 dBm
71710L
Ceyear
Adapter
2.4 mm (f) - 2.4 mm (f)
71120ME
Ceyear
Adapter
2.4mm(f)-3.5mm(f)
71125ME
Ceyear
Adapter
2.4 mm (m) - 3.5 mm (f)
71123ME
Ceyear
Adapter
2.4 mm (f) - N (m)
81107A
Ceyear
Adapter
2.4 mm (m) - N (m)
81107C
Ceyear
Cable
BNC (m) - BNC (m), 2 m
BNC-JJ-2000mm
Ceyear
Low loss
cable
2.4 mm cable (m-m), 1.5 m
2.4 mm-JJ-1500
mm
Ceyear
USB-GPIB
control card
USB-GPIB control card
GPIB-USB-HS
NI
GPIB cable
1.5 m
GPIB cable, 1.5
m
Zetai
GPIB card

cable with the PC through the GPIB card, and connect 4024 to be tested with the PC through the
direct-connected network cable. It is as shown in the figure:
Fig. 9 Schematic Diagram of Connection
b) Open the temperature compensation software TempComp.exe, and the software interface is as
follows:
Fig. 10 TempComp Interface
Click the Set Address button, and the communication address setting dialog will pop up. As shown in the
following figure, the GPIB address of the signal source to be connected, the GPIB Address of the power
meter and the IP Address of the spectrum analyzer can be set. The address of the signal source and
power meter can be inquired through 【System】menu. If the GPIB number of the signal source is 19,
no modification is required; similarly, if the GPIB number of the power meter is 13, no modification is
required. The IP address of the spectrometer can be inquired through 【System】->[Network Config].
GPIB cable
Signal source
Adapter
2.4 mm cable
PC
Adapter
Power
sensor
Power meter
GPIB card

Fig. 11 Set Address Interface
Attention: In case of the initial compensation, the following steps c) and d) shall be carried out. If steps c)
and d) have been carried out and “PowerMeter.powdoc” and “cal.txt” files have been generated under
the current directory, start from step 2 directly in case of re-compensation of other spectrometers. In
addition, when replacing another signal source or another cable for compensation, steps c) and d) shall
be carried out again.
c) Click Measure Power Meter to measure the actual power value of the signal generator after passing
the cables. The interface is as shown in the following figure. When the test is completed, it will
prompt to generate the file “PowerMeter.powdoc”.
Fig. 12 Generate Power Meter File
d) This step is mainly intended to measure the loss value of the cable. After the power meter is
calibrated and zeroed, connect 2.4 mm (m-m) low loss RF cable with the 1465H signal generator.
When the power sensor is connected with 2.4 mm (m-m) low loss RF cable, 2.4 mm (f-f) adapter
shall be used (when testing the 4024D/E, type 2.4 mm (f)-N (m) adapter shall be used). After that,
select the “Calibration Signal Source” of the compensation software. When the measurement is
completed, the status bar will prompt “Calibration Signal Source Finish”, and “Cal.txt” will be
generated. The interface is as follows:

Fig. 13 Finish of Calibration Signal Source
e) Set the path, click “Set Path”, and select the path of the DAC and temperature compensation file,
and then the follow-up measurement DAC file, 4024 test file as well as the compensation file will be
placed into a folder with the name of the spectrometer serial number.
f) Check 4024 series spectrum analyzer to ensure that there are no IF DAC files and compensation
files. If a DAC or compensation file exists, it shall be deleted firstly. The specific operation is as
follows: Connect the PC with the 4024 spectrum analyzer with a point-to-point network cable, open
the 4024 host folder: “ftp://172.141.xx.xx/” in PC browser, delete tc.tcdoc and IFGainAtten.dc in the
MMCMemory folder, and then restart the spectrum analyzer.
Attention: The IP address of the 4024 spectrometer and PC shall be located on the same network
segment. If they are different, the IP of the computer or spectrometer shall be set to make it within the
same network segment (for example, if the IP of the spectrometer is 172.141.11.202, the IP of the
computer shall be set to 172.141.11.xx).
Fig. 14 Measure Spectrum Analyzer
Connect the computer with the spectrum analyzer with a point-to-point network cable; connect the BNC
cable with 10 MHz reference input of the spectrometer and 10 MHz reference output of the signal
source, and then connect the cable connected with the power meter sensor in steps c) and d) with the
RF input port of the spectrometer, as shown in the above figure. Click Calibration Spetrum, and when the
calibration is completed, it will prompt that the “IFGainAtten.dc” file will be generated. This file is in the
folder with the name of the serial number created in step e).
g) Keep the connection mode in step 7 unchanged and click the Measure Spetrum, and the
compensation program will carry out 4024 preamplifier OFF and preamplifier OFF data test, the
screen will prompt the current measurement tasks, and it will prompt to generate the “tc.tcdoc” file
GPIB card
BNC cable
Signal source
Adapter
2.4 mm cable
PC
Adapter
Network cable
Spectrum analyzer
10MHz out
10MHz in

after the measurement is completed, as shown in the following figure. When this file and
“IFGainAtten.dc” are in the same folder, the temperature compensation is completed.
5.2 Automatic Test of Indicators
1 Software environment
Name of the software
Version
Description
Windows system
Win7/XP
The compensation software operating environment needs
GPIB driver and Visa library
4024AutoTest.exe
1.0.5
Software for automatic test of indicator
NI-GPIB driver.rar
GPIB-USB-HS
NI GPIB driver installation package
visa462full.exe
4.6.2
Visa library installation package
2 Environment
Instrument name
Main technical indicators
Recommended model
Manufacturer
Synthesized signal
generator
Frequency range: 250 kHz ~ 50
GHz
Power output: -100 dBm ~ +15 dBm
Frequency accuracy: ±0.02％
The power level can be calibrated
and stored
It has internal and external AM
modes and low frequency output
function
1465H (with 90 dB
programmable step
attenuator option)
Ceyear
Power meter
Frequency range: 50MHz ~ 67GHz
Power range: -60 dBm ~ +20 dBm
2438CB
Ceyear
Power sensor
Frequency range: 50MHz ~ 67GHz
Power range: -60 dBm ~ +20 dBm
71710L
Ceyear
Low-pass filter
Cutoff frequency: 1.0 GHz, insertion
loss<0.9 dB, off-band
suppression>65 dB
SLP-1200
Mini-Circuits
Low-pass filter
Cutoff frequency: 6.7GHz, insertion
loss<1 dB, off-band suppression>40
dB
VLF-6700
Mini-Circuits
Low-pass filter
Cutoff frequency: 18GHz, insertion
loss<2 dB, off-band suppression>40
dB
FLP-1800
Marki
50Ω adapter
Impedance: 50Ω, interface type: 2.4
mm female
70508
Ceyear
Adapter
2.4 mm (f) - 2.4 mm (f)
71120ME
Ceyear
Adapter
2.4mm(f)-3.5mm(f)
71125ME
Ceyear
Adapter
2.4 mm (m) - 3.5 mm (f)
71123ME
Ceyear
Adapter
2.4 mm (f) - N (m)
81107A
Ceyear
Adapter
2.4 mm (m) - N (m)
81107C
Ceyear
Cable
BNC (m) - BNC (m), 2 m
BNC-JJ-2000mm
Ceyear
Low loss cable
2.4 mm cable (m-m), 1.5 m
2.4 mm-JJ-1500 mm
Ceyear
USB-GPIB control
card
USB-GPIB control card
GPIB-USB-HS
NI
GPIB cable
1.5 m
GPIB cable, 1.5 m
Zetai

3 Test steps
1) Connect the computer with the spectrum analyzer with a point-to-point network cable; connect the
BNC cable with 10 M reference input of the spectrometer and 10 M reference output of the signal
source, and then connect the 2.4 mm (m-m) low loss RF cable with the 1465H signal generator, and
finally connect the spectrometer RF input with the 2.4mm (m-m) low loss RF cable with 2.4 mm (f-f)
adapter. (When testing the 4024D/E, use the 2.4 mm (m)-N (m) adapter; when testing the 4024F/G,
use the 2.4 mm (f-f) adapter). Connect the computer with the signal generator with the GPIB card
and GPIB cable, as shown in the following figure.
Fig. 15 Schematic Diagram of Connection of the Automatic Test
2) Open 4024AutoTest.exe, and the interface is as follows:
Fig. 16 Interface of the Automatic Test of Indexes
3) Fill in the communication parameters in the communication parameter setting column, including the
IP address of the spectrometer, signal source address (1465H), and power meter address. The
address of the signal source and power meter can be inquired through System menu. If the GPIB
number of the signal source is 19, no modification is required; similarly, if the GPIB number of the
power meter is 13, no modification is required. The IP address of the spectrometer can be inquired
GPIB card
BNC cable
Signal source
Adapter
Adapter
2.4 mm cable
PC
Network cable
Spectrum analyzer
10MHz out
10MHz in

through 【System】-[Network Configuration].
Attention: The IP address of the 4024 spectrometer and PC shall be located on the same network
segment. If they are different, the IP of the computer or spectrometer shall be set to make it within the
same network segment (for example, if the IP of the spectrometer is 172.141.11.202, the IP of the
computer shall be set to 172.141.11.xx).
Click the indexes to be tested, and click Start Test.
Attention:
①In case of measurement and display of the average noise level and remaining response, a 50Ω load
shall be connected at the RF port. The indicators including test frequency range, third-order intercept
point, 1 dB gain compression and standing-wave ratio can only be manually tested.
②In case of initial measurement of the reference level, scale fidelity and total level uncertainty, the
power meter shall be connected for calibration. No recalibration is needed when another spectrometer is
tested.
4) After the test of all indexes is completed, click Save Data to save the test results in the form of word
files.