ELEKTRONIKA
ELQ 30A
COPPER QUALIFIER
433-000-000
Operating Manual
2015.
OM 433-015-011xE
CONTENTS
1
2
3
4
5
6
Introduction .............................................................................................. 1-1
1.1
The Use of This Manual ..................................................................... 1-1
1.2
Application .......................................................................................... 1-1
Main Features ........................................................................................... 2-1
2.1
Keyboard and LEDs ........................................................................... 2-1
2.2
Connectors & Measuring Cables ........................................................ 2-4
Operating Instructions ............................................................................. 3-1
3.1
Start up and General Rules ................................................................ 3-1
3.2
Self Calibration ................................................................................... 3-2
3.3
Saving and Recall of Test Results ...................................................... 3-3
Manual Single Ended Tests ..................................................................... 4-1
4.1
Transmitter ......................................................................................... 4-2
4.2
Selective Receiver .............................................................................. 4-4
4.3
Wideband Receiver ............................................................................ 4-6
4.4
NEXT / LOSS Measurement .............................................................. 4-7
4.5
Single Ended Loss ............................................................................. 4-9
4.6
Longitudinal Balance Measurement ................................................. 4-10
4.7
Return Loss Measurement ............................................................... 4-12
4.8
Impedance Measurement ................................................................. 4-13
4.9
Spectrum Analyzer ........................................................................... 4-15
4.9.1
Stored Result as Reference ..................................................... 4-17
4.9.2
ITU PSD Mask as Reference ................................................... 4-18
4.10 Spectrogram ..................................................................................... 4-20
4.11 Wideband Noise Measurement ........................................................ 4-22
4.12 Impulse Noise Measurement ............................................................ 4-24
4.13 Micro Interruption Measurement ....................................................... 4-26
4.14 Echo Test ......................................................................................... 4-31
4.15 Telephone Simulator ........................................................................ 4-32
Manual END to END Tests ....................................................................... 5-1
5.1
Noise with Tone Measurement ........................................................... 5-2
5.2
Group Delay Distortion Measurement ................................................ 5-3
5.3
Phase Jitter & Frequency Error Measurement ................................... 5-5
5.4
Simultaneous Event Counter Mode .................................................... 5-6
5.5
Interruption Measurement .................................................................. 5-7
TDR Measurements .................................................................................. 6-1
6.1
Principles of Operation ....................................................................... 6-1
6.2
Mode Selection ................................................................................... 6-1
6.3
Manual Measuring Modes ................................................................. 6-2
6.3.1
Settings before Start................................................................... 6-3
6.3.2
Running the Test ........................................................................ 6-5
6.3.3
Waveform Evaluation ................................................................. 6-6
6.3.4
Location of Cross Talk Points ..................................................... 6-7
i
6.3.5
Comparison to Stored Result...................................................... 6-7
6.4
Automatic Measuring Modes .............................................................. 6-8
6.4.1
Start the Measurement ............................................................... 6-9
6.4.2
Test Results.............................................................................. 6-10
6.5
TDR application guide ...................................................................... 6-11
6.5.1
General Hints............................................................................ 6-11
6.5.2
Typical Waveforms ................................................................... 6-12
6.5.3
Automatic velocity constant calculation .................................... 6-15
7
Automatic Single Ended Test Sequences .............................................. 7-1
7.1
Mode Selection ................................................................................... 7-1
7.2
Preparing the Program ....................................................................... 7-2
7.3
Running the Program.......................................................................... 7-3
7.4
Test Parameters ................................................................................. 7-5
8
Automatic Master Slave Test of xDSL Lines .......................................... 8-1
8.1
Master Slave Mode Selection ............................................................. 8-1
8.2
Preparing the program ........................................................................ 8-2
8.3
Running the Program.......................................................................... 8-3
8.4
Data Rate Calculation ......................................................................... 8-5
8.5
Checking of Test Parameters ............................................................. 8-6
9
Automatic Master Slave Test of VF circuits ........................................... 9-1
9.1
Slave Mode ......................................................................................... 9-1
9.2
Master Mode ....................................................................................... 9-2
9.3
Running the Program.......................................................................... 9-5
9.4
Test Results ........................................................................................ 9-5
10
ESEL Measurement ............................................................................ 10-1
10.1 ESEL Measuring Method of ELQ 30A .............................................. 10-2
10.2 Preparing the ESEL Measurement ................................................... 10-2
10.3 Measuring Process ........................................................................... 10-3
10.4 Test Results ...................................................................................... 10-4
11
Battery Manager ................................................................................. 11-1
11.1 Battery Capacity Indication ............................................................... 11-1
11.2 Normal Charging............................................................................... 11-1
11.3 Fast Charging ................................................................................... 11-1
11.4 Regenerating Charge Process ......................................................... 11-2
11.5 Initial Charging .................................................................................. 11-2
12
USB Ports ............................................................................................ 12-1
12.1 USB A port for USB stick .................................................................. 12-1
12.2 USB B port for PC connection .......................................................... 12-1
12.3 Result Transfer from ELQ 30A to USB Stick .................................... 12-2
12.4 Result Transfer from USB Stick to ELQ 30A .................................... 12-3
12.5 Parameter Set Transfer from ELQ 30A to USB Stick........................ 12-4
12.6 Parameter Set transfer from USB Stick to ELQ 30A ......................... 12-5
12.7 Image Transfer to USB Stick ............................................................ 12-6
13
Status & Options................................................................................. 13-1
14
Software Upgrade (ELQ30u.exe) ....................................................... 14-1
ii
15
Settings ............................................................................................... 15-1
16
Specifications ..................................................................................... 16-1
16.1 General Specifications...................................................................... 16-1
16.2 Single End Manual Tests.................................................................. 16-2
16.3 End to End Manual Tests ................................................................. 16-7
16.4 Automatic Single Ended Test Sequences ........................................ 16-9
16.5 Automatic Master Slave Test of xDSL Lines .................................. 16-10
16.6 Automatic Master Slave Test of VF circuits .................................... 16-11
16.7 TDR Measurements ....................................................................... 16-12
16.8 High Impedance Probe ................................................................... 16-12
17
ORDERING INFORMATION ................................................................ 17-1
2015. 11.25
Copyright: Elektronika - Budapest, 2012
iii
ELQ 30 A
1
1 Introduction
INTRODUCTION
1.1 The Use of This Manual
This Operating Manual is intended to help the user in operating ELQ 30A
explaining the operation rules. While following the instructions as given
below, it is recommended to use the demo program found on the CD inside
the back cover of this manual. Running the demo under WINDOWS will
show you the front panel of the instrument with display and keyboard. By
clicking with the mouse on the keyboard, the “virtual” ELQ 30A will behave
as the real instrument, helping the user to carry out complete measuring
procedures, but of course only “virtually”.
1.2
Application
Numerous Digital Subscriber Line systems (xDSL) appeared on the market
to fulfill the need of faster data transfer for fast Internet access, remote LAN
access and interactive multimedia etc. The “x” in xDSL indicates the
different kinds of subscriber line technologies using the conventional
copper local loops for fast data transfer. The xDSL modems using higher
frequencies can achieve higher data rate than the plain old telephone
services (POTS) on the same cable pairs. The main benefit of xDSL is that,
there is no cable installation cost. The maximal loop length and the
achievable maximal data rate depend on the cable quality.
Before the installation of xDSL modems we must be sure that the
quality of the cable pair is sufficient for the given system.
ELQ 30A provides:
Measurement of all analogue parameters required for VDSL2, VDSL1,
ADSL2+, ADSL2, ADSL, READSL, ADSL G.LITE, HDSL, SHDSL, ISDN,
VF subscriber line qualification.
For line qualification:
• Automatic Single Ended line test programs
• Automatic End to End Master Slave test-programs
• Automatic achievable bit rate calculation for each xDSL system
For trouble shooting
• Numerous Single Ended and. End to End measurements
• Cable fault location with AC DC bridge
• Cable fault location with TDR
For data transfer
• USB Host Port for USB stick
• USB Device Port for PC connection
1-1
ELQ 30 A
2
2 Main Features
MAIN FEATURES
2.1
Keyboard and LEDs
Controls
Switches the ELQ 30A on and off. The instrument has an
automatic switch-off feature to save battery life: switch-off
takes place automatically 10 minutes after the latest
keystroke.
(see chapter settings for details)
F1
The function of the six Function keys depends on the
actual measuring mode.
F6
Starts or stops the selected measurement, program or
process.
This key is intended to acknowledge a selected measurement
mode or a new parameter, or to carry out other changes.
2-1
2 Main Features
ELQ 30 A
These keys are intended to select the required measuring
mode, to change a parameter or enter ‘0’ or space
These keys are intended to select the required option and to
adjust the position of vertical line cursor.
This key is intended to enter a minus sign or
to set a vertical maker in TDR mode or
set # in telephone simulator mode
This key can be used to cancel something.
This key is intended to call the help function.
This key can be used for the control of brightness
Pressing this key the contents of display is copied to memory
stick
This key in TDR mode activates the SMOOTH function or
enter a star character.
This key enters '1'.
2-2
ELQ 30A
2 Main Features
This key enters '2' or A B C letters when required.
This key enters '3' or D E F letters when required.
This key enters '4' or G H I letters when required.
This key enters '5' or J K L letters when required.
This key enters '6' or M N O letters when required.
This key enters '7' or P Q R S letters when required.
This key enters '8' or T U V letters when required.
This key enters '9' or W X Y Z letters when required.
LEDs
Mains indicator
Charge indicator
Measurement indicator
Remote control indicator
2-3
2.2 Connectors & Measuring Cables
2.2
1
2
3
4
5
6
7
8
9
2-4
Connectors & Measuring Cables
2.1/5.5 mm coaxial connector for mains or 12V car adapter
USB connector for connecting a PC
USB connector for connecting an USB stick
L 2 line connector (Tx only)
Ground connector (E)
L 1 line connector (A & B)
Auxiliary line connector (C)
TDR balance
High impedance PROBE
ELQ 30 A
ELQ 30A
2.2 Connectors & Measuring Cables
Line connectors
ELQ 30A has two line connectors:
Connector LINE 1
For connecting A & B wires for each measurement and for the
communication between the Master and Slave instruments.
Connector LINE 2
The Auxiliary LINE 2 connector is used only for transmitting white noise
and test signal for cross-talk measurement.
Ground connector
In case of LCL balance and AC-DC bridge-measurements the GND socket
of ELQ 30A should be interconnected with the ground.
Auxiliary line connector
For connecting wire C at 3 Point measurement
Measuring cables
Special balanced measuring cables
Two special balanced cables are provided with:
3-pole plug and a variable capacitor on the instrument-end
Red and black banana plugs on the line-end to connect the A & B wires of
the tested line.
The measuring cables have two identifiers: L1 or L2 and the serial
number of the instrument.
Ground cable
With green banana plugs at the two ends
Auxiliary line cable
With yellow banana plugs at the two ends
2-5
2.2 Connectors & Measuring Cables
ELQ 30 A
High impedance active probe for PSD measurement (410-000-000)
For PSD spectrum measurement on working lines the test instrument
should be connected parallel with the operating modems.
The digital systems are extremely sensitive for the capacitive load
therefore the regular measuring cables can not be used to connect the
instrument. For that purpose an active probe is provided with< 5 pF input
capacity (It is powered from ELQ 30A).The active probe has two banana
plugs on the line end and two plugs on the instrument end:
• 3-pole plug to be connected to LINE 1 connector
• Mini-din plug to be connected to the PROBE power output
2-6
ELQ 30A
3
3 Operating Instructions
OPERATING INSTRUCTIONS
3.1
Start up and General Rules
•
•
•
•
Switch the instrument on.
First the opening display appears showing the name and e-mail
address of the manufacturer ELEKTRONIKA.
After the percentage of the BATTERY LEVEL will be shown.
2 seconds later, self-test indication and the MAIN MENU appears
Basically, the user should follow the instructions appearing at the bottom of
each display in all measurement modes.
• In most cases, the measuring, setting and editing modes are
selected by the menu-driven operation system. For selection use
the vertical cursor keys and then press ENTER.
• The various cable and test parameters can be selected with the
function keys: F1 to F6. To facilitate and speed up operation, some
of the measuring modes can be selected directly with them too.
• To return back to the previous display, press ESC.
Measurements can be started or stopped with the START/STOP key.
During the measurement the MEAS indicator LED is lighting
3-1
3.2 Self Calibration
3.2
ELQ 30A
Self Calibration
The calibration of ELQ 30A can be started from the MAIN MENU.
Start of calibration:
•
Press the CAL (F6) key.
Loss calibration
• Press the LOSS (F2) key and follow the appearing instructions
Bridge calibration
•
Press the BRIDGE (F5) key and follow the appearing instructions
The conditions of the calibration are unchanged until the next calibration.
3-2
ELQ 30A
3.3
3.3 Saving and Recall of Test Results
Saving and Recall of Test Results
When a test is completed the result can be saved in each measuring
mode under a user given name. There are four identifiers of each stored
results:
• NAME (user given name)
• DATE (automatically added)
• TIME (automatically added)
• MODE (automatically added)
The automatically added identifiers are very comfortable for the user, as
the time is different for each test result, the same name can be used
repeatedly.
Note: The operator’s name would always be saved with the results as
well, but it would appear on the PC after an upload of results. It should
be given in before starting a measurement in MAIN MENU /
SETTINGS / OPERATOR`S NAME. (Details in chapter Settings)
Saving of test results:
Having the test finished:
• Press the SAVE (F1) key
• Type an object name and press ENTER
Recall of test results.
• Enter the MAIN MENU/STORED RESULTS option
• Select the required result and press ENTER
Deleting a test result
• Enter the MAIN MENU/STORED RESULTS option
• Select the result to be deleted and press DELETE (F3)
• If you are sure press YES (F2) otherwise NO (F5)
Deleting all the test results
• Enter the MAIN MENU/STORED RESULTS option
• Press EMPTY (F1)
• If you are sure press YES (F2) otherwise NO (F5)
3-3
ELQ 30A
4
4 Manual Single Ended Tests
MANUAL SINGLE ENDED TESTS
Enter the MANUAL MODES: SINGLE END option of MAIN MENU.
Having the ENTER key pressed the following display appears:
4-1
4.1 Transmitter
ELQ 30A
4.1 Transmitter
Two transmitting modes are provided:
• 1 FREQ (generation of one single frequency)
• MTTS (generation of 30/35 frequencies at the same time
The required mode can be selected with the F6 key
Test Procedure
Enter SINGLE END/TRANSMITTER mode.
1 FREQ Transmitting Mode
Setting a new test-frequency
• Press the FREQ (F5) key
• Type in the required frequency and press ENTER
Modification of the actual test-frequency
• Press the FREQ (F5) key
• Select the required frequency step with the horizontal cursors
• Modify the frequency with the vertical cursors
• Press ENTER
Impedance selection
• Press the IMPED (F4) key
• Select the required impedance and press ENTER
Level setting
• Press the LEVEL (F1) key
• Type in the required level and press ENTER
4-2
ELQ 30A
4.1 Transmitter
MTTS Transmitting Mode
• Press the MTTS (F6) key.
Frequency range setting
• Press the RANGE (F5) key
• Select the required frequency range and press ENTER
Impedance setting
• Press the IMPED (F4) key.
• Select the required impedance and press ENTER
The output can be enabled or disabled with the START/STOP key.
4-3
4.2 Selective Receiver
4.2
ELQ 30A
Selective Receiver
Two selective receiving modes are provided:
• 1 FREQ measurement on one single frequency)
• MTTS (measurement on 30/35 frequencies at the same time
The required mode can be selected with the F6 key
Test Procedure
• Enter SINGLE END/SELECTIVE RECEIVER mode
1 FREQ Receiving Mode
Setting a new test-frequency
• Press the FREQ (F5) key
• Type in the required frequency and press ENTER
Modification of the actual test-frequency
• Press the FREQ (F5) key
• Select the required frequency step with the horizontal cursors
• Modify the frequency with the vertical cursors
• Press ENTER
Band width selection
• Press the BANDW (F2) key
• Select the required band width and press ENTER
4-4
ELQ 30A
4.2 Selective Receiver
MTTS Receiving Mode
Frequency range setting
• Press the RANGE (F5) key
• Select the required frequency range and press ENTER
Input
• Pressing the INPUT (F3) key select the required line termination.
• Press the IMPED (F4) key
• Select the required impedance and press ENTER
For the proper dBm calculation the nominal line impedance (Z) should be
given even if high input impedance is set.
The measurement can be started or stopped by the START/STOP key
Test results
The results are available both in graphic and numeric forms
• In 1 FR mode they are displayed together
• In MTTS mode the result is displayed first in graphic form but
pressing the LIST (F2) key. Scroll the screen by pressing the F5/F6
or ↑/↓ keys. To get back to graphic form press ESC.
4-5
4.3 Wideband Receiver
4.3
ELQ 30A
Wideband Receiver
ELQ 30A provides wideband level measuring modes with auto ranging.
To extend the measuring range several filters are available.
Test Procedure
• Enter SINGLE END/WIDEBAND RECEIVER mode
Line Termination
Pressing the INPUT (F3) key select the required line termination
Impedance selection
• Press the IMPED (F4) key
• Select the required impedance and press ENTER.
For the proper dBm calculation the nominal line impedance (Z) should be
given even if high input impedance is set.
Filter Selection
• Press the FILTER (F2) key and enter the required filter option
The measurement can be started or stopped by the START/STOP key
Test Results
Test results are available both in graphic and numeric forms
4-6
ELQ 30A
4.4
4.4 NEXT / LOSS Measurement
NEXT / LOSS Measurement
Near-end cross talk (NEXT) is a major impairment for systems that share
the same frequency band for upstream and downstream transmission. The
NEXT can be measured by transmitting on L2 and receiving on L1.
ELQ 30A calculates the NEXT value as the ratio of transmitted and
received powers. The higher the NEXT the better the cross talk.
Two measuring modes are provided:
• 1 FREQ (measurement on one single frequency)
• SWEEP (measurement on 60 frequencies)
The required mode can be selected with the F6 key
Test Procedure
Enter SINGLE END/NEXT mode
4-7
4.4 NEXT / LOSS Measurement
ELQ 30A
1 FREQ Mode
Setting a new test-frequency
• Press the FREQ (F5) key
• Type in the required frequency and press ENTER
Modification of the actual test-frequency
• Press the FREQ (F5) key
• Select the required frequency step with the horizontal cursors
• Modify the frequency with the vertical cursors and press ENTER
SWEEP Mode
• Press the SWEEP (F6) key.
• Press the RANGE (F5) key and enter the required frequency range
Impedance
• Press the IMPED (F4) key and select the required impedance
• The measurement can be started or stopped by the START/STOP key
Test Results
Test results are available both in graphic and numeric forms.
• In 1 FR mode they are displayed together
• In SWEEP mode the result is displayed first in graphic form. To get
numeric form, press the LIST (F2) key. This will stop the
Measurement. Scroll the screen by pressing the F5/F6 or ↑/↓ keys. To
get back to graphic form press ESC.
4-8
ELQ 30A
4.5
4.5 Single Ended Loss
Single Ended Loss
ELQ 30A provides single ended loss estimation.
Test Procedure
Enter SINGLE END / SINGLE-ENDED LOSS mode
• Press the RANGE (F5) key and enter the required frequency range
Test Results
Test results are available both in graphic and numeric forms
• To get numeric form, press the LIST (F2) key. Scroll the screen by
pressing the F5/F6 or ↑/↓ keys.
• To get back to graphic form press ESC.
4-9
4.6 Longitudinal Balance Measurement
ELQ 30A
4.6 Longitudinal Balance Measurement
Longitudinal currents can cause noises on the line if the balance is
imperfect. Longitudinal balance ratio (LCL) reflects the ability of line to
suppress the effects of longitudinal currents.
ELQ 30A provides LCL measurement using the test circuit recommended
by ITU-T. Rec. 0.9
LCL=20 log U1/U2 dB
The better the balance of a cable pair the higher is LCL in dB.
Test Procedure
• Enter SINGLE END/BALANCE mode
Two measuring modes are provided:
• 1 FREQ (measurement on one single frequency)
• SWEEP (measurement on 60 frequencies)
The required mode can be selected with the F6 key
4-10
ELQ 30A
4.6 Longitudinal Balance Measurement
1 FREQ Mode
Setting a new test-frequency
• Press the FREQ (F5) key
• Type in the required frequency and press ENTER
Modification of the actual test-frequency
• Press the FREQ (F5) key
• Select the required frequency step with the horizontal cursors
• Modify the frequency with the vertical cursors and press ENTER
SWEEP Mode
• Press the SWEEP (F6) key.
• Press the RANGE (F5) key and enter the required frequency range
Impedance
• Press the IMPED (F4) key and select the required impedance
The measurement can be started or stopped by the START/STOP key
Test Results
Test results are available both in graphic and numeric forms.
• In 1 FR mode they are displayed together
• In SWEEP mode the result is displayed first in graphic form. To get
numeric form, press the LIST (F2) key. This will stop the
measurement. Scroll the screen by pressing the F5/F6 or ↑/↓ keys.
To get back to graphic form press ESC
The specified accuracy can be guaranteed only if the used L1 test cable
and the instrument have the same serial number
4-11
4.7 Return Loss Measurement
4.7
ELQ 30A
Return Loss Measurement
Return Loss factor indicates the deviation of line impedance from the
nominal value.
Test Procedure
• Enter SINGLE END/RETURN LOSS mode
Two measuring modes are provided:
• 1 FREQ (measurement on one single frequency)
• SWEEP (measurement on 60 frequencies)
The required mode can be selected with the F6 key
1 FREQ Mode
Setting a new test-frequency
• Press the FREQ (F5) key
• Type in the required frequency and press ENTER
Modification of the actual test-frequency
• Press the FREQ (F5) key
• Select the required frequency step with the horizontal cursors
• Modify the frequency with the vertical cursors and press ENTER
4-12
ELQ 30A
4.8 Impedance Measurement
SWEEP Mode
• Press the SWEEP (F6) key.
• Press the RANGE (F5) key and enter the required frequency range
Impedance
• Press the IMPED (F4) key and select the required impedance
The measurement can be started or stopped by the START/STOP key
Test Results
Test results are available both in graphic and numeric forms.
• In 1 FR mode they are displayed together
• In SWEEP mode the result is displayed first in graphic form. To get
numeric form, press the LIST (F2) key. This will stop the
measurement. Scroll the screen by pressing the F5/F6 or ↑/↓ keys. To
get back to graphic form press ESC
4.8
Impedance Measurement
In this mode the absolute value of line impedance can be measured.
Two measuring modes are provided:
• 1 FREQ (measurement on one single frequency)
• SWEEP (measurement on 60 frequencies)
The required mode can be selected with the F6 key
Test Procedure
• Enter SINGLE END/IMPEDANCE mode
4-13
4.8 Impedance Measurement
ELQ 30A
1 FREQ Mode
Setting a new test-frequency
• Press the FREQ (F5) key
• Type in the required frequency and press ENTER
Modification of the actual test-frequency
• Press the FREQ (F5) key
• Select the required frequency step with the horizontal cursors
• Modify the frequency with the vertical cursors and press ENTER
SWEEP Mode
• Press the SWEEP (F6) key.
• Press the RANGE (F5) key and enter the required frequency range
The measurement can be started or stopped by the START/STOP key
Test Results
Test results are available both in graphic and numeric forms.
• In 1 FR mode they are displayed together
• In SWEEP mode the result is displayed first in graphic form. To get
numeric form, press the LIST (F2) key. This will stop the
measurement. Scroll the screen by pressing the F5/F6 or ↑/↓ keys. To
get back to graphic form press ESC.
4-14
ELQ 30A
4.9
4.9 Spectrum Analyzer
Spectrum Analyzer
In this mode ELQ 30A can be used as a spectrum analyzer.
Frequency range: 200 Hz to 30 MHz
Input modes: 100, 135, 150, 600 Ohm, Unterminated and High Imp Probe
The high impedance active probe provides 5 kOhm II 5pF input impedance.
(The 15 dB loss of high impedance probe is automatically compensated)
Display modes:
• dBm display mode
• dBm/Hz display mode
Evaluation modes:
• NORM. Displaying the actual value of input signal
• PEAK Displaying the peak value of input signal
• AVG Displaying the average value of input signal
• SAVG Displaying the average of the last 10 measurements
The number of displayed frequencies: 300
Selectable frequency ranges: 0.3, 4, 20 kHz
0.3, 0.6, 1.5, 3, 9, 12, 18, 30 MHz
The selectable bandwidth depends on the selected range. The following
table shows the selectable, bandwidths and frequency steps for the
different frequency ranges. (ZOOM facility)
Frequency
Range
30 MHz
18 MHz
12 MHz
9 MHz
3 MHz
1.5 MHz
600 kHz
300 kHz
20 kHz
4 kHz
0.3 kHz
Bandwidth and
Frequency step
500 Hz to 100 kHz
500 Hz to 60 kHz
500 Hz to 40 kHz
500 Hz to 30 kHz
500 Hz to 10 kHz
500 Hz to 5 kHz
500 Hz to 2 kHz
500 Hz to 1 kHz
50 Hz to 100 Hz
10 Hz to 20 Hz
1 Hz
4-15
4.9 Spectrum Analyzer
ELQ 30A
Test Procedure
• Enter SINGLE END/SPECTRUM ANALISER mode
Settings before the measurement
• Press the RANGE (F5) key and enter the required frequency range
• Press the INPUT (F3) key and select the required input mode.
• Press the IMPED (F4) key and enter the nominal line impedance
• Set the impedance even if you use the high impedance probe because
it is needed for calculations as well.
• Select the display mode (dBm or dBm/Hz) with the F6 key
Settings when the measurement is running
• Press the MODE (F4) key and enter the required evaluation mode
• Set the cursor on the critical point of the spectrum
• Press the ZOOM (F6) key and enter the required band width
• Press the GAIN (F3) key if you want to use fix gain instead of auto
ranging and enter the required gain
Test results
The test results are displayed first in graphic form during the Measurement.
To get numeric form:
• Interrupt the Measurement by the START/STOP key,
• Press the LIST (F2) key and the result appears in numeric form.
• Scroll the screen by pressing the F5/F6 or ↑/↓ keys. To get back to
graphic form press ESC
4-16
ELQ 30A
4.9.1
4.9 Spectrum Analyzer
Stored Result as Reference
An earlier obtained test result can be used as reference if the trace as
reference option is activated. To recall the stored reference trace:
• Press REF (F1)
• Enter the RESULT option
• Enter the stored result to be used as reference
The measurement can be started or interrupted by the START/STOP key
4-17
4.9 Spectrum Analyzer
4.9.2
ELQ 30A
ITU PSD Mask as Reference
Transmitting power of DSLAM-s are limited. The PSD of transmitted signal
mustn’t exceed the PSD mask recommended by ITU.
ELQ 30A provides the possibility to display the actual output spectrum of
an operating DSLAM together with the recommended PSD mask.
To recall the corresponding PSD mask:
• Press REF (F1)
• Enter the TEMPLATE option
•
•
•
When the TEMPLATE menu appears select a system group
Do the DPBO and UPBO adjustment if necessary
Enter the required system
Doing so ELQ 30A automatically set the proper frequency range and
shows the PSD mask belonging to the selected system.
The measurement can be started or interrupted by the START/STOP key
4-18
ELQ 30A
4.9 Spectrum Analyzer
Application Notes
The accuracy of the spectrum measurement depends on the proper setting
of evaluation mode, display mode and bandwidth. There are two typical
measuring tasks:
• PSD spectrum Measurement on working lines
• Noise spectrum Measurement on passive lines
• PSD Spectrum Measurement on Working Lines
Line connection
In this case the test instrument should be connected parallel to the line with
high impedance. The digital systems are extremely sensitive for the
capacitive load therefore the regular measuring cables can not be used to
connect the instrument. For line connection an optional active probe is
provided to ELQ 30A with a high input-impedance: > 5 kOhm < 5 pF.
The loss of high impedance probe is automatically compensated if the
HIGH IMPEDANCE PROBE input option is selected.
The suggested settings to reach the best test results
As the actual transmit power of the tested modem is changing according to
the actual data transfer situation the best is to set:
• Wide bandwidth
• dBm/Hz display mode
• AVG or SAVG evaluation mode
Noise Spectrum Measurement on Passive Lines
Line connection
Both ends of the tested line should be terminated. The use of the special
balanced cable of ELQ 30A is recommended for this measurement.
The suggested settings to reach the best test results
There are two typical types of noises:
Wide band cross-talk noises caused by other xDSL systems
Discrete frequency noises caused by radio stations
For the analysis of wide band cross talk noises the best is to set:
Wide bandwidth
• dBm/Hz display mode
• NORMAL evaluation mode
For the analysis of discrete frequency noises the best is to set:
The narrowest bandwidth
• dBm display mode
• AVG or SAVG evaluation mode
4-19
4.10 Spectrogram
4.10
ELQ 30A
Spectrogram
The purpose of Spectrogram PC program is to boost the spectrum
measurement abilities of ELQ 30A utilizing the memory capacity of a PC or
an USB stick.
In this mode ELQ 30A performs spectrum measurements in every second
and the obtained results are stored at the connected external device. The
large external memory capacity allows the storage the results of long test
sequences up to 72 hours
Tasks when the external device is a PC.
•
•
Connect the PC to the USB Device Port of ELQ 30A
Select the PC CONTROL option of the MAIN MENU
The further steps can be found in the Operating Manual of Control Program
Tasks when the external device is USB stick
Enter the SINGLE END / SPECTROGRAM mode.
When the SPECTROGRAM display appears:
•
•
•
•
4-20
Select the RESULT NAME option with the vertical cursor keys
Press ENTER
Type in a result name
Press ENTER again
ELQ 30A
4.10 Spectrogram
Set the test parameters using the cursor keys.
• Select the parameter with the vertical cursor keys
• Modify the selected parameter with the horizontal cursor keys
Start he test sequence with the START/STOP key
Doing so, the display of actual spectrum situation appears.
The test sequence can be finished with the START/STOP key
4-21
4.11 Wideband Noise Measurement
4.11
ELQ 30A
Wideband Noise Measurement
Noises reduce the data transfer capability of subscriber lines. The
transmitted signal suffers from impairments due to noises. Noise on the
telephone line normally occurs because of improper balance, cross talk and
bad splices. The wideband noise can be characterized by power level
(RMS value) and frequency spectrum. The received noise signal is named
wideband noise when its peaks don’t exceed the RMS value more than 12
dB (UPEAK < 4 URMS)
ELQ 30A provides filters for numerous European frequency band-plane.
The proper measurement time depends on the nature of noise. In case of a
quasi stationer noise 1 to 10 sec is enough. If the noise level is slowly
changing, a longer measurement time provides the proper test result.
Selectable measuring times:
• 1, 5, 10, 30 sec
• 1, 5, 10, 30 min
• 1, 2, 4, 8, 12, 24, 48, 72 hours
Continuous measurement
The impairment of communication caused by noises does not depend only
on the level but also on the time distribution of noise.
When >1 min measuring time is selected ELQ 30A displays the noise level
in histogram form with 60 time slots providing information about the time
distribution.
Test Procedure
• Enter SINGLE END/WIDEBAND NOISE mode
• Press the DUR (F5) key and enter the required measurement time
• Press the FILTER (F2) key and enter the required filter option
• Press the INPUT (F3) key and enter the required line termination.
For the proper dBm calculation the nominal line impedance (Z)
should be given even if high input impedance is set.
• Press the IMPED (F4) key and enter the required line impedance.
The measurement can be started or stopped by the START/STOP key
The elapsed time is continuously indicated
Test Results
The form of test result depends on the selected measuring time.
In case of:
1sec to 1 min the form is numeric and quasi analog
Over 1min histogram and list form
4-22
ELQ 30A
4.11 Wideband Noise Measurement
When the selected measuring time is shorter than 5 minute the following
display appears:
When the selected measuring time is 5 minute or longer the test result is
displayed in histogram form but pressing the LIST (F2) key the result
appears in numeric form. To get back to graphic form press ESC
4-23
4.12 Impulse Noise Measurement
ELQ 30A
4.12 Impulse Noise Measurement
Impulse noise is a non-stationary cross talk from electromagnetic events in
the vicinity of phone lines. Examples of impulse noise generators are as
diverse as the opening of refrigerator door (the motor turns on/off), control
voltages to elevators (phone lines in apartment buildings often run through
the elevator shaft) and ringing of phones on lines sharing the same binder.
Any burst of noise that produces a voltage exceeding the power level of the
background noise by more than 12dB is declared impulse noise.
In impulse noise-measuring mode ELQ 30A operates as an impulse
counter. An impulse is counted when the received noise signal exceeds a
preset threshold for more than 500 ns. (The recommended threshold
setting is 14 dB above the measured wideband noise level.)
The selectable measuring times:
• 1,5,10, 30 sec
• 1, 5, 10, 30 min
• 1, 2, 4, 8, 12, 24, 48, 72 hours
The noise impulses may reset the VDSL modems spoiling the data transfer
for a longer time. The impairment of communication does not depend only
on the impulse number but also on the time distribution of impulses. The
same number of noise impulses my cause:
One reset if they come in one single burst
Numerous resets if they come in different times
ELQ 30A displays the counted impulses in histogram form with 60 time
slots providing information about the time distribution.
Test Procedure
• Enter SINGLE END/IMPULSE NOISE mode
• Press the TRESH (F2) key and enter the required threshold level
• Press the INPUT (F3) key and enter the required line termination.
• Press the IMPED (F4) key and enter the required line impedance
• Press the DUR (F5) key and enter the required Measurement time
• Start counting by the START/STOP key
Test Results
The form of test result depends on the selected measuring time.
In case of:
1sec to 30 sec the form is numeric and quasi analog
Over 30 sec histogram and list form
4-24
ELQ 30A
4.12 Impulse Noise Measurement
When the selected measuring time is shorter than 1 minute the following
display appears:
When the selected measuring time is one minute or longer the test result is
displayed in histogram form but pressing the LIST (F2) key the result
appears in numeric form. To get back to graphic form press ESC
4-25
4.13 Micro Interruption Measurement
4.13
ELQ 30A
Micro Interruption Measurement
Principles of Operation
A micro interruption is a temporary line interruption due to external
mechanical action on the copper wires constituting the transmission path,
for example, at a cable splice. Splices can be hand-made wire-to-wire
junctions, and during cable life oxidation phenomena and mechanical
vibrations can induce micro interruptions at these critical points.
The effect of a micro interruption on the transmission system can be a
failure of the digital transmission link. In the presence of an interruption of
specified maximum length the xDSL modem may reset.
ELQ 30A detects the micro interruptions using 1020 Hz test tone. An
interruption is detected when the level of the received test tone drops below
a designated threshold for more than 0.6 ms.
The detected interruptions are divided into five categories by duration:
• 0.6 ms to 3 ms
• 3ms to 30 ms
• 30 ms to 300 ms
• 300 ms to 1min
• >1min
The threshold level is adjustable in steps to the values 3, 6, 10 and 20 dB
below the normal test signal level. The measuring time is adjustable
between 4 min and 72 hours.
ELQ 30A provides detailed information about
• Number of interruptions divided into five categories.
• Relative duration of interruptions.
• Error seconds.
• Time distribution of interruptions in 240 time slots.
The interruption Measurement can be performed in:
• Single Ended mode with loop back using the same ELQ 30A for
transmitting and receiving.
• End to End mode using two ELQ 30A-s connected to the ends of the
tested pair. In this case one of them transmits a test tone the other
one receives and evaluates it.
4-26
ELQ 30A
4.13 Micro Interruption Measurement
Settings Before Interruption Measurement
To save the battery life ELQ 30A has a power down facility switching the
instrument off after a preset time. Therefore in case long time interruption
Measurement ELQ 30A should be used with mains adapter. If it is not
possible then the power off function should be disabled before starting a
long time test like interruption
Disablement of power down function
• Enter the SETTINGS & OPERATOR mode
• Enter the POWER OFF TIME function
• Enter the OFF option
Test Procedure
• Enter INTERRUPTION mode
(Doing so the 1020 Hz test tone automatically appears on connector L2)
Measuring time setting
• Press the DUR (F5) key and select the required measuring time by the
vertical cursors and press ENTER.
Threshold level setting
Press the THRESH (F3) key and select the required threshold level by the
vertical cursors and press ENTER.
Having the settings finished start the Measurement by pressing the
START/STOP key.
4-27
4.13 Micro Interruption Measurement
ELQ 30A
Measuring process
The measuring process consists of two parts.
• First when the Measurement is started ELQ 30A measures the level of
the received test tone and stores that value as REFERENCE LEVEL
of the Measurement.
• Having the REFERENCE LEVEL stored ELQ 30A starts to count
interruptions.
The following picture is displayed during and after the Measurement
keeping the user informed about the actual count of interruptions and the
measuring time left:
When the Measurement is ready the user can get immediate information
about the:
• Number of interruptions divided into five categories.
• Relative duration of interruptions.
• Error seconds.
In addition ELQ 30A provides detailed information about the time
distribution of interruptions. The measuring time is divided into 240 time
slots.
Number of interruptions in a time slot
Pressing the GRAPH (F3) key the number of interruptions appears in
graphic form. The displayed picture shows the time distribution for a
selected category as a vertical bar graph.
4-28
ELQ 30A
4.13 Micro Interruption Measurement
• To see the count of interruptions in a given time slot, use the horizontal
cursors.
• To change the category, press the CAT (F1) key select the required
category with the vertical cursors and press ENTER
• To see the count of interruptions in numeric form, press the LIST (F2)
key. The appearing list shows the count for each category and time slots
together
To return press GRAPH (F2)
4-29
4.13 Micro Interruption Measurement
ELQ 30A
Relative duration of interruptions in a time slot
Pressing the REL (F3) key the test relative duration of interruptions
appears in graphic form. The displayed picture shows the time distribution
as a vertical bar graph.
• To see the relative duration in a given time slot, use the horizontal
cursor keys.
• To see the relative duration of interruptions in numeric form, press the
LIST (F2) key.
4-30
ELQ 30A
4.14 Echo Test
To return press GRAPH (F2)
Storage of test results
The measuring results can be stored by pressing the SAVE (F1) key when
the short form test result picture is displayed. For the sake of economical
utilization of memory the resolution of stored results depends on the count
of interruptions as it is shown in the next table:
Count range ........................................................................................ Resolution
0 to 15..................................................................................................1
15 to 20..................................................................................................5
20 to 150 ..............................................................................................10
150 to 200 ..............................................................................................50
200 to 1500 ..........................................................................................100
1500 to 2000 ..........................................................................................500
2000 to 15000 ......................................................................................1000
4.14
Echo Test
There are several reasons for the undesirable quality degradation and the
appearance of audible echoes is one of them. This kind of quality
degradation is inherent in the network equipment and the end-user phone
devices.
For the test of the disturbing echoes ELQ 30A transmits short ~1020 Hz
signal packets with proper amplitude shaping and measures the amplitude
and the traveling time of the reflected signal.
Measuring ranges:
• Traveling time range: 15 to 2500 ms
• Time resolution: 5 ms
• Amplitude indication: down to -60 dBm
Test Procedure
• Enter SINGLE END/ECHO TEST option
• Select and enter the required impedance
4-31
4.15 Telephone Simulator
ELQ 30A
The measurement can be started or interrupted by the ST/SP key
Test Results
The test results are displayed in graphic form during the measurement. To
get numeric form:
• Interrupt the measurement by the ST/SP key,
• Press the LIST (F2) key and the result appears in numeric form.
Having the measurement completed and stopped the result can be saved
with the SAVE (F1) key.
4.15
Telephone Simulator
ELQ 30A in this mode is able to:
• Receive a call sent by another user
• Send a test call to another user and talk with him
• Allow a conversation between the two users
• Measure the battery and ringing voltage & ringing frequency
Test Procedure
Enter SINGLE END/TELEPHONE SIMULATOR option
4-32
ELQ 30A
4.15 Telephone Simulator
The default is the call waiting (On hook state)
• In this state ELQ 30A is waiting for a call from the other end of the line
and measures the ringing voltage and frequency.
4-33
4.15 Telephone Simulator
ELQ 30A
To receive the call
• Press the START/STOP key (Off hook state)
• Having the conversation finished press the START/STOP key again
To make a call
•
•
•
•
Select the required dial mode with the MODE (F5) key
Press the START/STOP key (Off hook state)
Type in the required phone number.
Having the conversation finished press the START/STOP key again
Modification of DTMF or pulse parameters
• Press the PARAM. (F6) key
•
•
•
4-34
Do the modification
Press ESC
To return to the standard values press the RESET (F4) key
ELQ 30A
5
5 Manual END to END Tests
MANUAL END TO END TESTS
Enter the MANUAL MODES: END TO END option of MAIN MENU.
Having the ENTER key pressed the following display appears:
5-1
5.1 Noise with Tone Measurement
5.1
ELQ 30A
Noise with Tone Measurement
The noise with tone measurement needs two ELQ 30A instruments
connected to the ends of the tested pair. One of them transmits 1020 Hz
conditioning tone the other one receives and evaluates it.
Test Procedure
• Select the NOISE WITH TONE option with the ↑/↓ keys
• Select the function by pressing the Tx (F5) or Rx (F6) key
The measurement can be started or interrupted by the ST/SP key.
5-2
ELQ 30A
5.2
5.2 Group Delay Distortion Measurement
Group Delay Distortion Measurement
ELQ 30A applies the multi tone test method described in the
recommendation ITU-T O.81 Appendix I
The group delay distortion measurement needs two ELQ 30A instruments
connected to the ends of the tested pair. One of them transmits a test tone
the other one receives and evaluates it. ELQ 30 A performs Group delay
distortion and level measurements simultaneously:
Test Procedure
• Select the GROUP DELAY option with the ↑/↓ keys
• Select the function by pressing the Tx (F5) or Rx (F6) key
5-3
5.2 Group Delay Distortion Measurement
ELQ 30A
To change the reference value
•
•
•
Press the REF (F5) key
Select the required option with the ↑/↓ keys
Press ENTER
The measurement can be started or interrupted by the ST/SP key.
The display can be changed between group delay and level measurement
with the F3 key
Test Results
The test results are displayed in graphic form during the measurement. To
get numeric form:
•
Interrupt the measurement with the ST/SP key,
•
Press the LIST (F2) key and the result appears in numeric form.
Having the measurement completed and stopped the result can be saved
with the SAVE (F1) key.
5-4
ELQ 30A
5.3
5.3 Phase Jitter & Frequency Error Measurement
Phase Jitter & Frequency Error Measurement
The jitter and frequency error measurement needs two ELQ 30A
instruments connected to the ends of the tested pair. One of them transmits
a jitter free quartz accurate 1020 Hz test tone the other one receives and
evaluates it. ELQ 30A performs the two measurements simultaneously
according to rec. ITU-T O.91
Test Procedure
• Select the JITTER & FREQU option with the ↑/↓ keys
• Select the function by pressing the Tx (F5) or Rx (F6) key
The measurement can be started or interrupted by the ST/SP key.
5-5
5.4 Simultaneous Event Counter Mode
5.4
ELQ 30A
Simultaneous Event Counter Mode
The event test needs two ELQ 30A instruments connected to the ends of
the tested pair. One of them transmits a test tone the other one receives it
and simultaneously counts the number of events like:
• Amplitude hits (described in rec. ITU-T O.95)
• Phase hits (described in rec. ITU-T O.95)
• Interruptions (described in rec. ITU-T O.61)
• Noise impulses (described in rec. ITU-T O.71)
Measuring arrangement:
Test signal: 1020 Hz
Measuring times: 5, 15, 30, 60 min
Maximum count: 65000 for each counter
Test Procedure
• Select the EVENT COUNTER option with the ↑/↓ keys
• Select the function by pressing the Tx (F5) or Rx (F6) key
5-6
ELQ 30A
5.4 Simultaneous Event Counter Mode
Tasks at the receiver end
• Press the DUR (F5) key and enter the required measuring time.
• Press the THR (F2) key and enter the required thresholds.
• Start the measurement with the ST/SP key
The measuring process
The process consists of two parts.
• First when the measurement is started ELQ 30A measures the level
of the received test tone and stores that value as REFERENCE
LEVEL.
• Having the REFERENCE LEVEL stored ELQ 30A starts to count the
events. The elapsed time is continuously indicated.
Having the measurement completed and stopped the result can be saved
with the SAVE (F1) key.
Important Note:
The use of mains adapter is recommended to avoid the discharge of
battery during a long time test!
5.5
Interruption Measurement
See section 4.14
5-7
ELQ 30A
6
6 TDR Measurements
TDR MEASUREMENTS
6.1
Principles of Operation
ELQ 30A in Time Domain Reflectometer (TDR) mode utilizes the radar
principle. A measuring pulse is transmitted down a cable. When that pulse
reaches the end of the cable or a fault along the cable, a certain part or all
the pulse energy is reflected back to the instrument.
ELQ 30A measures the time taken by the pulse to travel down the cable,
see the problem, and reflect back. Than converts this time to distance and
displays the information as a waveform. The displayed waveform shows all
impedance discontinuities along the cable.
The amplitude of any reflection is determined by the degree of the
impedance change.
Distance to fault is displayed on the screen after the cursor is positioned to
the start of the reflected fault pulse
6.2
•
Mode Selection
Enter the TDR TESTS option of MAIN MENU
ELQ 30A provides five manual and two automatic measuring modes
6-1
6.3 Manual Measuring Modes
6.3
ELQ 30A
Manual Measuring Modes
Investigation of a pair (L1 mode)
Transmission and reception of pulses takes place over the L1 terminal
ELQ 30A performs a sequence of repeated Measurements. The last result
is graphically displayed and the previous ones are cleared. (The most
frequently used basic mode of operation)
Long time Measurement of a pair (L1 LONG TIME mode)
This measuring mode can be used to locate lose contacts. ELQ 30A
performs a sequence of repeated Measurements in this mode as well but
the results are not cleared. All the results are displayed together. If the
features of the tested pair change during the Measurement the waveform
becomes thick at the place of change.
Location of cross talk points (XTALK mode)
The measuring pulse is transmitted via L2, and the reflected pulses are
received via L1.
Comparison with memory (L1& MEMORY and L1-MEMORY modes)
L1 & MEMORY The actual trace and a stored one are displayed together.
L1- MEMORY The difference between them is displayed.
A waveform stored in memory can be used for comparison of cable
conditions before and after a critical period or a repair job.
6-2
ELQ 30A
6.3.1
6.3 Manual Measuring Modes
Settings before Start
• Enter the required manual measuring mode of TDR TESTS menu
In case of mode L1 selection the following display appears
For the proper evaluation of the obtained waveform we have to know
• the propagation velocity of the tested cable
For the proper initial settings of test parameters we have to know
• the gauge and
• the approximate length of the tested cable
The propagation velocity and the gauge of different cable types can be
taken from the cable library of ELQ 30A.
Range selection
• Press the RANGE (F4) key and select the measuring range definitely
covering the length of cable and press ENTER
Cable Type selection
The actually valid cable type can be seen on the upper field of display.
Parameters belonging to that type will be used for the subsequent
measurements. To change the cable type:
•
Press the V/2 (F3) key
6-3
6.3 Manual Measuring Modes
6-4
•
Call the cable library by pressing the C.LIB (F3) key
•
•
•
Enter the new type
Press APPLY
Press ESC
ELQ 30A
ELQ 30A
6.3.2
6.3 Manual Measuring Modes
Running the Test
Having mode, range and cable-type set the measurement can be started
by pressing the START/STOP key.
The measurement is running repeatedly until a following START/STOP
keystroke.
• The last obtained waveform is displayed in all measuring modes except
L1 LONG TIME mode. To save battery life, the measurement is
automatically stopped after one minute elapsed time.
• In L1 LONG TIME mode all the obtained waveforms are displayed
together showing the intermittent faults. In this mode there is no time
out.
Balance Adjustment
Adjust the rotary BALANCE control to minimize the transmit pulse at the
start of waveform. (In XTALK mode, the balance control is not effective.)
6-5
6.3 Manual Measuring Modes
6.3.3
ELQ 30A
Waveform Evaluation
Reading Distance to Fault
After the measurement process is terminated, move the red cursor with the
horizontal cursor keys to the start point of the reflected pulse.
The displayed value of the cursor shows the distance to fault. Remember to
deduct the length of the test leads.
Waveform Expansion (ZOOM)
The waveform can be shown in more detail around the cursor line by using
the ZOOM facility. The amount of horizontal expansion can be selected as
follows:
• Using the ← → keys move the cursor to the point around which you want
to expand the waveform
• Press the ZOOM (F2) key and select the required value with the ↑↓ keys
On the down left corner of the display there is a “ZOOM INFO” showing
information about the non visible part of trace if the ZOOM is on
Use of Marker
The marker appears as a vertical green line and can be placed to any
selected point of the waveform. Displayed are: the position of marker, the
position of cursor, further the true distance from marker to cursor.
To measure the distance between any two points, the marker should be
used as follows:
• Move the cursor to the point from which the distance is to be
measured and set the marker by pressing MARKER.
• Move the cursor to the point to which the distance measurement is
to be carried out.
The distance between these points is directly shown by the display.
The Smoothing Function
Because of the attenuation losses, the reflection from a fault long way
down the cable may be much smaller than a regular reflection from a
nearby discontinuity. The amplitude display of near reflections can be
reduced by the smoothing function as follows:
• Press the SMOOTH key
• Select the required reduction with the ↑↓ keys
6-6
ELQ 30A
6.3.4
6.3 Manual Measuring Modes
Location of Cross Talk Points
The measurement
In XTALK mode one of the pairs is connected to the L1 sockets, and the
other one to the L2 sockets. The measuring pulse is transmitted on L2
socket the reflected pulses are received on L1. This mode is typically used
for locating splits and resplits. The steps of measurement are similar for the
L1 mode. (The BALANCE control is not operational in this mode.)
6.3.5
Comparison to Stored Result
Waveforms stored in memory can be used for comparison of the cable
conditions before and after a critical period, or before and after a repair job.
The stored waveform and the recently obtained waveform can only be
compared if the main parameters are the same. As the main parameters
are stored together with the waveform, the actual measurement must be
performed with the stored settings (V/2, RANGE, PULSE WIDTH, GAIN).
Accordingly, in this mode, the controls of the above mentioned parameters
are not operational. There are two methods of comparison:
Comparison in L1 & MEMORY mode
In this mode, the stored and the actually obtained waveforms are displayed
together (the stored is brown the actually obtained is blue)
Measurement steps:
• Enter the L1 & MEMORY option of TDR MENU The list of stored
waveforms is now displayed.
• Select the memory location containing the stored waveform to be
used for comparison and press ENTER.
• Start the measurement by pressing the START/STOP key.
• For evaluation, the CURSOR, MARKER and ZOOM facilities can
be used as in the single pair investigation.
The vertical position of stored Waveform can be shifted with the ↑ ↓ keys.
Comparison in L1 - MEMORY mode
In this mode, the difference between the obtained and the stored Waveform
is displayed. Measurement steps:
• Enter the L1 - MEMORY option of TDR MENU. The list of stored
waveforms is now displayed.
• Select the memory location containing the stored waveform to be
used for comparison and press ENTER.
• Start the measurement by pressing the START/STOP key.
For evaluation, the CURSOR, MARKER and ZOOM facilities can be used
as in the single pair investigation.
6-7
6.4 Automatic Measuring Modes
6.4
ELQ 30A
Automatic Measuring Modes
In auto configuration TDR mode ELQ 30A can detect one or more reflected
pulses and preset the best setup for each pulse separately
Auto configuration mode can be selected booth for single and double pair
measurement
6-8
ELQ 30A
6.4.1
6.4 Automatic Measuring Modes
Start the Measurement
After the mode selection one of the auto mode displays appears
The reflected pulse detection can be started with the START/STOP key.
The detection process may take several seconds depending on the
features of the tested line.
6-9
6.4 Automatic Measuring Modes
6.4.2
ELQ 30A
Test Results
When the detection process completed the result display appears showing
the first reflected pulse and the number of detected pulses.
The further reflected pulses can be selected with the ↑↓ keys
The Alteration of Test Setup
If necessary the obtained waveform can be improved by the alteration of
the automatically preset RANGE, GAIN and PULSE values.
6-10
ELQ 30A
6.5
6.5.1
6.5 TDR application guide
TDR application guide
General Hints
Reflections can be classified to fall into two groups:
• Regular reflections
• Reflections from faults (irregular reflections)
Regular reflections
Even faultless pairs may produce reflections caused by inherent
discontinuities such as joints or cable type changes.
Reflections from faults
A faulty pair produces regular reflections and, in addition, reflections from
the fault. Because of the attenuation losses, the reflection from a fault long
way down the cable may be much smaller than a regular reflection from a
nearby discontinuity.
A suitable method to distinguish regular and irregular reflections is to
compare the faulty cable with a good one. By using the L1 & MEMORY
method, the regular reflections caused by the common features of the two
pairs can be separated from reflections caused by faults.
• In telephone cables there are several pairs of conductors. The
physical length of the pairs depends on their position in the cable, the
length increasing with the distance of the layer from the center.
Consequently, the physical length of pairs can be longer than the
cable length, and the propagation velocity (V) may be different for
different layers. Therefore, in case of comparative tests, the two pairs
compared should be in the same layer.
• If there is more than one fault, the first one may reflect so much from
the pulse energy that the subsequent fault may not be seen.
Therefore, having located and eliminated the first fault, the cable
section following the fault should be tested again.
6-11
6.5 TDR application guide
6.5.2
ELQ 30A
Typical Waveforms
Open circuit (series faults)
The reflection is a positive (upward going) pulse. No reflected pulse from
the far end.
Short circuit (shunt fault)
The reflection is a negative (downward going) pulse. No reflected pulse
from the far end.
Change of cable type (mismatch)
The amplitudes of the reflected pulses are determined by the degree of
impedance changes.
Joints (splices)
The joints produce ‘S’ shaped reflections.
6-12
ELQ 30A
6.5 TDR application guide
Taps (tee joints)
A tap produces two pulses, one at the beginning and the other at the end of
the tap.
The troubleshooting may be difficult if the tested pair is tapped at many
points. In this case, moving from tap to tap the test should be progressively
done
Splits and resplits
Splits and resplits produce cross talk.
Loading coils
Loading coils produce positive (upward going) reflections. Generally, TDR’s
cannot ‘see’ beyond the first loading coil. For fault location beyond the
loading coil, the ELQ30A should be connected to another point following
the coil.
6-13
6.5 TDR application guide
ELQ 30A
Capacitance network
The reflection is negative (downward going pulse).
Wet section
The presence of water causes a capacitance increase. Therefore, there are
two pulses: one from the beginning, the other from the end of the wet
section.
Open sheath
If the metallic sheath of the cable is broken, the position of the break can
be located by connecting the test leads to the shield and to as many
conductors as possible.
Lose Contacts
The location of lose contacts can be found with Long Time test.
If the features of the tested pair change during the Measurement the
waveform becomes thick at the place of change.
6-14
ELQ 30A
6.5.3
6.5 TDR application guide
Automatic velocity constant calculation
The unknown propagation velocity constant can be determined in the
following cases:
• The length of the cable is known
• The distance to a known point is available (e.g. join box, change of
cable-type etc.)
• A sample of the same cable is available with a known length
• The distance between two points is known.
When the cable length or the distance to a known point is available
• Connect the cable to the L1 terminals and obtain a waveform
• Stop the measurement with the START/STOP key
• Place the cursor to the start point of the pulse reflected from the
known point.
• Press the V/2 (F3) key
• Press the CURSOR (F5) key
• Type in the known distance
• Pressing the ENTER key, the proper value will be set automatically
When the distance between two points is known
• Connect the cable to the L1 sockets and obtain a waveform
• Stop the measurement with the START/STOP key
• Place the cursor to the starting point of the pulse reflected from the
first known point, and set the marker by pressing ENTER
• Place the cursor to the starting point of the pulse reflected from the
second known point
• Press the V/2 (F3) key
• Press the CUR-MAR (F6) key
• Type in the known distance between the two points.
• By pressing the ENTER key, the proper value will be set automatically.
6-15
ELQ 30A
7
7 Automatic Single Ended Test Sequences
AUTOMATIC SINGLE ENDED TEST SEQUENCES
7.1
Mode Selection
ELQ 30A provides single sided test sequences to estimate the data transfer
capacity of tested lines used for different xDSL systems. The far end of the
tested line should be unterminated.
Tolerance masks of cable parameters as Loss, LCL, Return Loss,
Impedance, and the principal system parameters are pre-programmed for
different xDSL systems
After selecting the xDSL system ELQ 30A launches an automatic test
sequence containing unilateral measurements
•
Enter the AUTO MODES/SINGLE END option of MAIN MENU
7-1
7.2 Preparing the Program
ELQ 30A
7.2 Preparing the Program
When SINGLE END mode is selected the SINGLE END LINE TEST
menu appears providing xDSL system dependent automatic test
sequence options.
7-2
•
Enter the required system group (E.g. ADSL2+ ) and then
the ADSL2+ submenu appears
•
Draw the highlight on the required system with the ↑/↓ keys
ELQ 30A
7.3 Running the Program
•
•
•
Select the required line spectrum with the FDD/EC (F1) key
Press the RATE ↓ (F3) key and enter the required bit rate
In case DPBO is necessary press the DPBO (F4) key and enter the
required ESEL and MUS values using the corresponding keys
•
When the setting of test parameters is completed press ENTER and
then the automatic program start display appears offering offers three
program options
SHORT (loss and noise Measurement)
LONG (Measurement of all characteristics except NEXT and FEXT)
FREE (user selected Measurements)
The program option can be selected with the function keys F1 to F3
Having the required system entered the start display appears
In case of ADSL or VDSL systems the position of ELQ 30A should be
declared. It can be changed with the ELQ30A (F5) key.
7.3
Running the Program
The program can be started or aborted by the START/STOP key
Important note:
Before starting the program be sure that the far end of the tested line
Is unterminated!.
7-3
7.3 Running the Program
ELQ 30A
Short Form Test Result
When the test program is completed a short form result page appears with
immediate PASS/FAIL information and with the list of detailed result pages
.
When the qualification is FAIL the reasons are marked with asterisks.
To study the detailed result pages
• Draw the highlight on the required result page with the ↑/↓ keys
• Press ENTER
Selecting for example the CABLE LOSS result the loss/frequency
diagram and the template for pass/fail decision are shown
Moving the cursor line by the horizontal arrow keys, the loss
and frequency values belonging to the cursor position are displayed.
Pressing the LIST (F2) key the test result appears in list form.
7-4
ELQ 30A
7.4 Test Parameters
7.4 Test Parameters
The test parameters required for the line qualification can be found on five
parameter pages. Pressing the PARAM (F6) key the system parameter
page appears
The system parameters are preprogrammed
The further parameters can be reached by the F4, F5, F6 keys
7-5
7.4 Test Parameters
ELQ 30A
The data transfer speed calculation is based on the S/N ratio.
Testing a passive line the noise can be measured but the signal can’t be
because there is no operating modem connected. The signal level should
be calculated.
For this calculation the Tx PSD masks of the modem must be known.
.
7-6
ELQ 30A
7.4 Test Parameters
The DMM parameters are freely settable by the operator
7-7
ELQ 30A
8
8.1
8 Automatic Master Slave Test of xDSL Lines
AUTOMATIC MASTER SLAVE TEST OF XDSL LINES
Master Slave Mode Selection
In this test group ELQ 30A provides automatic bi-directional Measurement
of principal characteristics of the subscriber line using two instruments.
They are connected to the ends of the tested pair in MASTER-SLAVE
arrangement. The two instruments communicate over the tested pairs.
The Master initializes the measurements and collects the results.
The Slave performs the measurements according to the Master’s
commands and sends back the results.
ELQ 30A can be programmed in the main menu as MASTER or SLAVE.
Numerous pre-programmed parameter sets are available for different xDSL
systems containing system parameters and cable parameter limits. Preprogrammed system independent test sequences with six frequency
ranges are provided for trouble-shooting.
8-1
8.2 Preparing the program
ELQ 30A
8.2 Preparing the program
When MASTER mode is selected the MASTER MODE MENU appears
providing xDSL system dependent and system- independent automatic
test sequence options.
• Enter the required system group (E.g. ADSL2+ )
Doing so the ADSL2+ submenu appears
•
•
•
8-2
Draw the highlight on the required system with the ↑/↓ keys
Select the required line spectrum with the FDD/EC (F1) key
Press the RATE ↓ (F3) key and enter the required bit rate
ELQ 30A
•
8.3 Running the Program
In case DPBO is necessary press the DPBO (F4) key and enter the
required ESEL and MUS values using the corresponding keys
•
When the setting of test parameters is completed press ENTER and
then the automatic program start display appears offering offers three
program options
SHORT (loss and noise Measurement)
LONG (Measurement of all characteristics except NEXT and FEXT)
FREE (user selected Measurements)
The program option can be selected with the function keys F1 to F3
In case of FREE option the user can select the Measurements to be
performed. To add or remove a Measurement:
Select the Measurement with the ↑↓ keys and Press ENTER
In case of ADSL or VDSL systems the master position should be declared.
It can be changed with the MASTER (F5) key.
You can reach service telephone mode by pressing TEL (F4)
8.3
Running the Program
The program can be started or aborted by the START/STOP key.
Important note:
Before starting the program be sure that the slave is ready!
8-3
8.3 Running the Program
ELQ 30A
Short Form Test Result
When the test program is completed a short form result page appears with
immediate PASS/FAIL information and with the list of detailed result pages.
When the qualification is FAIL the reasons are marked with asterisks.
To study the detailed result pages
• Draw the highlight on the required result page with the ↑/↓ keys
• Press ENTER
• To return to the short form press ESC
Selecting for example the CABLE LOSS result the loss/frequency diagram
and the template for pass/fail decision are shown
Moving the cursor line by the horizontal arrow keys, the loss and frequency
values belonging to the cursor position are displayed.
Pressing the LIST (F2) key the test result appears in list form.
8-4
ELQ 30A
8.4 Data Rate Calculation
8.4 Data Rate Calculation
At system dependent tests the achievable bit rate is calculated with 6 dB
default noise margin. The BITRATE DOWN and BITRATE UP result pages
provide additional information about the achievable data rate using 21
different margin values.
To see the list of achievable data rates with different noise margins press
the SPEED (F6) key and the following display appears
If the low bit-rate is the reason of failure a new calculation can be
performed with a reduced noise margin without starting a new
Measurement. To modify the noise margin:
• Press the MARGIN (F5) key
• Select a new margin with the ↑↓ keys and press ENTER.
8-5
8.5 Checking of Test Parameters
ELQ 30A
8.5 Checking of Test Parameters
The test parameters of system dependent sequences
The test parameters of the system dependent tests are specified on four
parameter pages
Pressing the PARAM (F6) key the page of SYSTEM PARAMETERS will be
shown. The other pages can be called with the F4, F5, F6 keys.
8-6
ELQ 30A
8.5 Checking of Test Parameters
The data transfer speed calculation is based on the S/N ratio.
Testing a passive line the noise can be measured but the signal can’t be
because there is no operating modem connected. The signal level should
be calculated.
For this calculation the Tx PSD masks of the modem must be known.
8-7
ELQ 30A
9
9 Automatic Master Slave Test of VF circuits
AUTOMATIC MASTER SLAVE TEST OF VF CIRCUITS
ELQ 30A provides the qualification of Leased and Dial-up (Switched)
circuits. In MATER-SLAVE mode ELQ 30A performs automatic bidirectional measurements of principal characteristics of the line using two
instruments. They are connected to the ends of the tested pair. The two
instruments communicate over the tested line.
• The Master initializes the measurements and collects the results.
• The Slave performs the measurements according to the Master’s
commands and sends back the results.
Using pre-programmed system parameters and cable parameter limits
ELQ 30A provides immediate PASS/FAIL qualification and detailed
information about the reasons of failure. ELQ 30A can be programmed as
MASTER or SLAVE as well.
9.1
Slave Mode
For programming ELQ 30A to Slave mode:
• Enter the SLAVE option of MAIN MENU and the slave display appears
The functions of slave depend on the type of tested line. There are two
possibilities: Leased or Switched circuit. (The default is LEASED).
When the Master and Slave should communicate over an exchange enter
the SWICHED CIRCUIT option
9-1
9.2 Master Mode
9.2
ELQ 30A
Master Mode
Preparing the program
•
Select the MASTER option of MAIN MENU
•
Enter the VF. CIRCUIT option
• Enter the required type then one of the next three displays appears
9-2
ELQ 30A
•
9.2 Master Mode
Enter the required quality then showing the list of the selectable
measurements one of the next three displays appears
9-3
9.2 Master Mode
•
•
9-4
Select the measurements to be performed
To see the test parameters press the PARAM (F6) key
ELQ 30A
ELQ 30A
9.3
9.3 Running the Program
Running the Program
The program can be started or aborted by the START/STOP key.
If the test-object is a leased circuit
The master and the slave start to communicate automatically when the test
sequence is started with the START/STOP key.
If the test-object is a switched circuit
Pressing the START/STOP key the master first dials up the slave. The user
is continuously kept informed about the state of calling. When the slave is
connected and the two ELQ 30A instruments effected the communication
the test sequence is started automatically.
Having the automatic test program started with the START/STOP key the
measuring picture appears informing the user about the progress of the test
sequence.
9.4 Test Results
Short Form Test Result
When the test program is completed a short form result page appears with
immediate PASS/FAIL information and with the list of detailed result pages.
When the qualification is FAIL the reasons are marked with asterisks.
9-5
9.4 Test Results
ELQ 30A
To study the detailed result pages
• Draw the highlight on the required result page with the ↑/↓ keys
• Press ENTER
Selecting for example the CABLE LOSS result the loss/frequency diagram
and the template for pass/fail decision are shown.
•
Press the LIST (F2) key to see the test result In list form
Special features
ELQ 30A provides master slave measurement for the test of very long lines
having very high propagation delay (Up to 10 sec).
In case of the test of circuits having high propagation delay the required
receiver delay of ELQ 30A can be set in the following way:
• Enter the RECEIVER DELAY option of AUTO TEST menu
• Set the required receiver delay with the number keys
• Press ENTER
9-6
ELQ 30A
10
10 ESEL Measurement
ESEL MEASUREMENT
The development of Triple Play services requires higher bandwidth. Higher
bandwidth and substantial performance gain can be reached by deploying
DSLAM-s in a remote side cabinet near to the customer premises. There is
no problem at clean networks where all the customers are connected to the
same local cabinet.
At mixed networks a part of subscriber lines are directly connected to the
Exchange and others to the local DSLAM-s. Serious crosstalk problem and
service loss may occur if the local DSLAM-s work with full power because
in that case there is a considerable level difference between the directly
connected and local lines at the flexibility point where the lines are
adjoining.
The generally accepted method to protect the directly connected customers
is the use of Spectrum Shaping or other words Downstream Power Back
Off (DPBO) at the local DSLAM-s in cabinet.
The key points in local DSLAM programming is the electrical length of
Exchange Side Cable (ESEL). The value of ESEL is equal with the
measured attenuation of Exchange Side Cable at 1 MHz between the
Exchange and local DSLAM.
ELQ 30A provides ESEL measurement until 120 dB in MASTER- SLAVE
arrangement.
10-1
10.1 ESEL Measuring Method of ELQ 30A
10.1
ELQ 30A
ESEL Measuring Method of ELQ 30A
In case of long cables the loss measurement at 1 MHz can be inaccurate
if the noise level is high. To eliminate this problem ELQ 30A applies the
combination of loss and noise measurement.
The exchange side instrument supply high level test signals gradually
increasing the frequency until 1 MHz.
The remote side instrument performs signal and noise measurements on
the gradually increasing frequencies until the S/N ratio sinks below a
designated threshold. Over this critical frequency ELQ 30A applies
extrapolation using the characteristic of a reference cable.
10.2
Preparing the ESEL Measurement
At the SLAVE side
• Enter the SLAVE option of MAIN MENU
At the MASTER side
• Enter the MASTER option of MAIN MENU
• Enter the ESEL-MEASUREMENT option of MASTER MODE MENU
10-2
ELQ 30A
10.3 Measuring Process
Doing so the ESEL-MEASUREMENT display appears
• Press the IMPED. (F2) key and select the required line impedance
• Select the location of receiving with the REC. (F5) key
Important Note:
At this measurement the RECEIVER must be at the REMOTE end!
10.3 Measuring Process
Start the measurement with the STAR/STOP key
When the test sequence is ready the appearing ESEL RESULT display
shows the calculated ESEL value and the number of the last sub carrier
over which extrapolation is applied.
10-3
10.4 Test Results
10.4
ELQ 30A
Test Results
Pressing LOSS (F4) key the LOSS display appears showing the calculated
and the measured loss characteristics. The measuring results are available
in numeric form as well. To see the numeric values press the LIST (F2) or
LIST (F5) key
To see the noise level:
• Return with ESC to the ESEL RESULT display and
• Press the NOISE (F6) key
10-4
ELQ 30A
11
11 Battery Manager
BATTERY MANAGER
Battery Charging Modes
ELQ 30A is equipped with a processor controlled automatic chargerdischarger circuit providing the following functions:
• Battery capacity indication
• Charging process control:
• Normal charging
• Fast charging
• Battery regeneration
• Battery initialization
• Protection against deep discharging
These functions can be reached in MAIN MENU / BATTERY MANAGER
11.1 Battery Capacity Indication
The battery manager system continuously measures the battery state.
When ELQ 30A is switched on battery information appears showing the
actual state of battery in % form.
11.2 Normal Charging
When the mains adapter is connected and the battery level sinks below
60% the automatic circuit starts normal charging with 0.1C (C is the
nominal capacity of the built in battery)
When the full charge is reached the control system automatically stops
charging and the BATTERY LEVEL > 95 % indication appears.
The CHARGE indicator LED is lighted while the charging is in progress.
When full charge is reached, the charger is automatically switched off, and
the CHARGE indicator LED goes out.
11.3 Fast Charging
When FAST CHARGING or regenerative charging is selected in the
BATTERY MANAGER MENU the battery is charged with a relatively high
current ( 0.5C) for approx. 2 to 3 hours during which the instrument can't be
used. In this mode after a short time the instrument is automatically
switched off. If temperature of the battery exceeds the environment by
10oC the charging is automatically finished.
The blinking of CHARGE indicator LED indicates that the process is in
progress.
When the charging is completed the charge indicator goes out, and the
instrument stays switched off.
11-1
11.4 Regenerating Charge Process
ELQ 30A
Switching the instrument on during the process:
Information can be obtained about the current battery
The process can be aborted by pressing the ABORT (F3) key.
11.4
Regenerating Charge Process
In this mode the battery is discharged and fast charged. The instrument
can't be used during this process. To start regenerating process:
Enter BATTERY MANAGER
Select the REGENERATING option and press ENTER
In the first phase, discharging message is displayed. In the second phase,
the instrument is automatically switched off, and the charge indicator LED
is blinking.
The process can be interrupted by pressing the ABORT (F3) key.
11.5
Initial Charging
The initialization is the first charging of battery. It is necessary when the
INITIAL CHARGING RECOMMENDED warning appears (The same
process is required when the battery is replaced.) The process can be
started by the START/STOP key
During the 2 to 3 hour process the battery state measuring system will be
calibrated. The initial process can be skipped or interrupted but in these
cases always the BATTERY LEVEL IS UNKNOWN battery charging level
indication appears when the instrument is switched on. Therefore the
skipping or interruption of the process is not recommended.
DO NOT CHARGE THE BATTERIES WHEN
TEMPERATURE IS BELOW +5 °C OR OVER +45 °C.
11-2
THE
AMBIENT
ELQ 30A
12
12 USB Ports
USB PORTS
ELQ 30A has two USB ports:
• USB A host port for USB stick
• USB B device port for PC connection
There are two transfer options:
• Result transfer
• Parameter set transfer
Important note: The options can be used only if they are activated in
ELQ 30A.
12.1 USB A port for USB stick
ELQ 30A can be connected to a USB stick via USB A interface. The USB
stick provides data transfer between a PC and ELQ 30A without
installing a special device driver to the PC.
This solution is advantageous for the user who does not have a PC on
the spot of the measurement
ELQ 30A uses the following directory structure:
At data transfer from PC via USB stick you have to use that structure.
12.2
USB B port for PC connection
ELQ 30A can be connected to a PC via USB B interface.
The ELQ30c.exe control program provides the following features:
• Transfer and post processing of test results
• Parameter set transfer and edition
• Checking the HW and SW version and other features of ELQ 30A
12-1
12.3 Result Transfer from ELQ 30A to USB Stick
12.3
ELQ 30A
Result Transfer from ELQ 30A to USB Stick
• Plug the USB stick into the USB host Port of ELQ 30A
• Enter the USB STICK option of MAIN MENU
Doing so the DATA TRANSFER page appears
Select and enter the FROM ELQ TO USB STICK option
To copy only one of the test results to USB stick draw the highlight to the
wanted name and press the ONE (F3) key
To copy all test results press the ALL (F1) key
12-2
ELQ 30A
12.4
12.4 Result Transfer from USB Stick to ELQ 30A
Result Transfer from USB Stick to ELQ 30A
Plug the USB stick into the USB host Port of ELQ 30A
Enter the USB STICK option of MAIN MENU
Doing so the DATA TRANSFER page appears
Select and enter the FROM USB STICK TO ELQ option
•
•
To copy only one of the test results to USB stick draw the highlight to
the wanted name and press the ONE (F3) key
To copy all test results press the ALL (F1) key
12-3
12.5 Parameter Set Transfer from ELQ 30A to USB Stick
ELQ 30A
12.5 Parameter Set Transfer from ELQ 30A to USB Stick
Plug the USB stick into the USB host Port of ELQ 30A
Enter the USB STICK option of MAIN MENU
Doing so the DATA TRANSFER page appears
Select and enter the FROM ELQ TO USB STICK option
•
•
12-4
To copy only one of the parameter sets to USB stick draw the
highlight to the wanted name and press the ONE (F3) key
To copy all the parameter sets to USB stick press the ALL (F1) key
ELQ 30A
12.6 Parameter Set transfer from USB Stick to ELQ 30A
12.6 Parameter Set transfer from USB Stick to ELQ 30A
Plug the USB stick into the USB host Port of ELQ 30A
Enter the USB STICK option of MAIN MENU
Doing so the DATA TRANSFER page appears
•
Select and enter the FROM USB STICK TO ELQ option
To copy only one of the parameter sets to USB stick draw the highlight to
the wanted name and press the ONE (F3) key
To copy all the parameter sets to USB stick press the ALL (F1) key
12-5
12.7 Service telephone mode
12.7
ELQ 30A
Image Transfer to USB Stick
Pressing the PRINT SCREEN key the actual content of the display will be
transferred to the [Screen] folder of USB stick in bmp format.
12-6
ELQ 30A
13
13 Status & Options
STATUS & OPTIONS
Status & Options point of the MAIN MENU provides useful hardware and
software information:
In case of Master-Slave Measurements the two instruments must have
the same software version number!
13-1
ELQ 30A
14
14 Software Upgrade (ELQ30u.exe)
SOFTWARE UPGRADE (ELQ30U.EXE)
The software of ELQ 30A can be upgraded without disassembling the
instrument. The new software version can be downloaded from a PC using
the upgrade file made by the manufacturer. This file contains the
description of the upgrade process.
To set ELQ 30A to upgrade mode:
• Enter SETTINGS
• Select the UPGRADE option with the vertical cursor keys
• Press ENTER
Doing so ELQ 30A is ready for upgrade. To return without upgrade switch
the instrument off.
14-1
ELQ 30A
15
15 Settings
SETTINGS
In setting mode some important parameters can be set.
The menu of general settings can be reached from the main menu
The date and time can be typed in with the number keys. The name of
operator can be typed in like an SMS at mobile phones. (space by key 0
twice, backspace by ←, accept by ENTER, escape by ESC)
To change the other parameters:
• Select the parameter by the vertical cursors and press ENTER.
• Change parameter by the vertical cursors and press ENTER.
Note: In SLAVE mode the power off system is not active.
15-1
ELQ 30A
16
16 Specifications
SPECIFICATIONS
16.1 General Specifications
Power supply:
Internal rechargeable NIMH battery pack
Operation time.......................................................... approx. 8 hours
(Without backlight)
Charging (without taking the battery pack out)
From 100 to 264 VAC ......................................... with mains adapter
From 12 V car battery .............................................. with car adapter
Charging time............................................................. less than 3 hours
(Fast charging mode)
Display .......................................................... 320 x 240 color LCD-TFT
Connectors
Connector for mains or 12V car adapter ............ 2.1/5.5 mm coaxial
Power supply connector for active probe ....................... Mini-din-4P
Line connectors .............................................. 4 mm banana sockets
Ground connector ............................................ 4 mm banana socket
USB A ........................................... USB 1.1 host port for USB-Stick
(FAT16, FAT32 file system supported)
USB B ........................................ USB 1.1 device port to connect PC
Over voltage protection
Between a and b or ground ................................................ 200 V DC
Longitudinal voltage ............................................................. 60 V AC
Ambient temperature ranges
Reference...............................................................................23±5°C
Rel. humidity 45% to 75%
Normal operation.............................................................. 0 to +40°C
Rel. humidity 30% to 75% *(<25g/m3)
Limits of operation ........................................................... -5 to +45°C
Rel. humidity 5% to 95% *(<29g/m3)
Storage and transport .................................................. –40 to +70°C
Rel. humidity 95% at +45°C *(<35g/m3)
Dimensions ............................................................. 224 x 160 x 44 mm
Weight (Including battery pack) ...................................... approx. 1.5 kg
* Without condensation
16-1
16.2 Single End Manual Tests
16.2
ELQ 30A
Single End Manual Tests
Receiver
Inputs
10 kHz to 30 MHz ........................... 100, 135, 150 Ω Balanced or High
200 Hz to 10 kHz ........................................... 600 Ω Balanced or High
Selective Level Measurement
Frequency
Frequency Range ................................................... 200 Hz to 30 MHz
Frequency resolution .................................................................... 1 Hz
Frequency accuracy......................................................... 2x10-6 ±1 Hz
Receiving modes ..................................... One Frequency/MTTS/Sweep
Band width
200 Hz to 10 kHz ......................................................................... 20 Hz
10 kHz to 5 MHz ................................. 20, 200 Hz, 1.74, 1.95, 3.1 kHz
5 MHz to 18 MHz ...................................... 200 Hz, 1.74, 1.95, 3.1 kHz
18 MHz to 30 MHz .................................................. 1.74, 1.95, 3.1 kHz
Measuring Range (with 20 Hz band width)
10 kHz to 30 MHz ...................................................... -120 to +10 dBm
200 Hz to 10 kHz ........................................................ -120 to +4 dBm
Level Resolution ........................................................................ 0.1 dB
Accuracy at 0 dBm
200 Hz to 10 kHz ...................................................................... ±0,5 dB
10 kHz to 5 MHz ....................................................................... ±0.3 dB
5 MHz to 30 MHz ......................................................................... ±1 dB
Wideband Level Measurement
Frequency Range ....................................................... 200 Hz to 30 MHz
Measuring Range
10 kHz to 30 MHz ........................................................ -50 to +10 dBm
200 Hz to 10 kHz .......................................................... -50 to +4 dBm
Level Resolution ........................................................................ 0.1 dB
Accuracy at 0 dBm
200 Hz to 10 kHz ...................................................................... ±0,5 dB
10 kHz to 5 MHz ....................................................................... ±0.3 dB
5 MHz to 30 MHz ......................................................................... ±1 dB
16-2
ELQ 30A
16.2 Single End Manual Tests
Transmitter
Outputs
10 kHz to 30 MHz ........................................ 100, 135, 150 Ω Balanced
200 Hz to 10 kHz ..........................................................600 Ω Balanced
Frequency
Frequency Range .................................................... 200 Hz to 30 MHz
Frequency resolution ..................................................................... 1 Hz
Frequency accuracy.......................................................... 2x10-6 ±1 Hz
Transmitting modes .................................. One Frequency/MTTS/Sweep
Output level
10 kHz to 30 MHz ......................................................... +10 to –40 dBm
200 Hz to 10 kHz ............................................................ +4 to –45 dBm
Level Resolution .......................................................................... 0.1 dB
Accuracy at 0 dBm
200 Hz to 10 kHz ....................................................................... ±0,5 dB
10 kHz to 5 MHz ........................................................................ ±0.3 dB
5 MHz to 30 MHz .......................................................................... ±1 dB
NEXT/ Loss Measurement
Frequency
Frequency Range ..................................................... 200 Hz to 30 MHz
Frequency resolution ...................................................................... 1 Hz
Frequency accuracy .......................................................... 2x10-6 ±1 Hz
Impedances
10 kHz to 30 MHz..........................................................100, 135, 150 Ω
200 Hz to 10 kHz........................................................................... 600 Ω
Measuring modes ..................................................One frequency, Sweep
Measuring range
NEXT ................................................................................... up to 80 dB
Loss ..................................................................................... up to 90 dB
16-3
16.2 Single End Manual Tests
ELQ 30A
Single-End Insertion Loss Measurement
Frequency Ranges ............................................... 1.5, 3,9,12,18,30 MHz
Line length range .............................................................. 100 m to 6 km
Direct measurement ............................................... 100 kHz to 6 MHz or
Up to 45 dB cable loss
Extrapolation ..................................................................... Over 6 MHz or
Over 45 dB cable loss
Vertical scale ........................................................................... 0 to 80 dB
Accuracy .................................................................................... 2 to 4 dB
LCL Balance Measurement
Frequency range ........................................................ 200 Hz to 30 MHz
Impedances .................................................................. 100, 135, 150 Ω
Display range: ........................................................................ 0 to 70 dB
Accuracy at 35 dB with special balanced cable
200 Hz to 100 kHz ..................................................................... ±2 dB
100 kHz to 5 MHz ...................................................................... ±1 dB
5 MHz to 30 MHz.................................................................... ±2,5 dB
Return Loss Measurement
Frequency range ......................................................... 200 Hz to 30 MHz
Line impedances (Z)
10 kHz to 30 MHz ....................................................... 100, 135, 150 Ω
200 Hz to 10 kHz ........................................................................ 600 Ω
Display range: ....................................................................... up to 40 dB
Accuracy at 20 dB
200 Hz to 18 MHz .......................................................................... ±2 dB
Impedance Measurement
Frequency range ........................................................... 200 Hz to 30 MHz
Measuring range
10 kHz to 30 MHz ................................................................ 50 to 400 Ω
200 Hz to 10 kHz ............................................................. 300 to 1600 Ω
Accuracy
200 Hz to 10 kHz ................................................................ ± 10% ± 5 Ω
10 kHz to 18 MHz .................................................................. ±5% ± 5 Ω
18 MHz to 30 MHz .............................................................. ±10% ± 5 Ω
16-4
ELQ 30A
16.2 Single End Manual Tests
Spectrum Analyzer
Frequency range ........................................................200 Hz to 30 MHz
Line impedances
10 kHz to 30 MHz ........................................... 100, 135, 150 Ω or High
200 Hz to 10 kHz ............................................................ 600 Ω or High
Display range ....................................................... down to -140 dBm/Hz
Maximum input level
With high impedance probe ................................................... +20 dBm
Without high impedance probe
200 Hz to 10 kHz ...................................................................... +4 dBm
10 kHz to 30 MHz ................................................................... +10 dBm
Frequency Range
30 MHz
18 MHz
12 MHz
9 MHz
3 MHz
1.5 MHz
600 kHz
300 kHz
20 kHz
4 kHz
0.3 kHz
Bandwidth & Freq. Step
500 Hz to 100 kHz
500 Hz to 60 kHz
500 Hz to 40 kHz
500 Hz to 30 kHz
500 Hz to 10 kHz
500 Hz to 5 kHz
500 Hz to 2 kHz
500 Hz to 1 kHz
50 Hz to 100 Hz
10 Hz to 20 Hz
1 Hz
Number of displayed frequencies ..................................................... 300
Saving of result ........................................... the actual content of display
Evaluation ................................................... NORM, PEAK, AVG, SAVG
Units ................................................................................. dBm, dBm/Hz
Wideband noise Measurement
Frequency range ....................................................... 200 Hz to 30 MHz
Filters for noise Measurements: ... ADSL, ADSL 2+, VDSL, P, No Filter
Measurement times: .................................................... 1sec to 72 hours
Evaluation for 1 sec to 1 min ......................................... Quasi analogue
Evaluation for 5 min to 72 hour.................. Histogram with 60 time slots
Impulse Noise Measurement
Pulse width ................................................................................ > 500 ns
Interval size ................................................................................ > 10 ms
Threshold range ................................................................... 1 to 500 mV
Maximum count: ............................................................................ 65000
Measuring times ........................................................... 1sec to 72 hours
Evaluation for 1 to 30 sec ........................................................... numeric
Evaluation for 1 min to 72 hour .................. Histogram with 60 time slots
16-5
16.2 Single End Manual Tests
ELQ 30A
Micro Interruption Measurement
Transmitter
Impedance ........................................................................... 600 Ohm
Test signal ..............................................................................1020 Hz
Output level ...............................................................................0 dBm
Receiver
Impedance ........................................................................... 600 Ohm
Input level range ................................................... from 0 to –30 dBm
Selectable threshold below the normal level .............. 3, 6, 10, 20 dB
Accuracy of Threshold
For 3, 6, 10 dB ..........................................................................± 1 dB
For 20 dB ..................................................................................± 2 dB
Measuring time adjustable. ..................................... 4 min to 72 hours
Interruption Categories ........................................... 0.6 ms to 3 ms
3 ms to 30 ms
30 ms to 300 ms
300 ms to 1 min
>1 min
Evaluation ........................................... Relative duration, Errored sec
Count & time distribution/category
Echo Test
Impedances .............................................................................. 600Ohm
Frequency ............................................................................... ~1020 Hz
Traveling time .................................................................. 15 to 2500 ms
Resolution ....................................................................................... 5 ms
Amplitude indication.....................................................down to -60 dBm
Telephone Simulator
Telephone set simulator functions
On Hook ........................................................................... Ring detect
Off Hook ................................ Loop closing, Call with DTMF or Pulse
Conversation ........ Half duplex with built in speaker and microphone
Test functions
On Hook ..... Central battery, Ringing voltage & Frequ. measurement
Off Hook ........................................................DTMF or Pulse test call
with adjustable level and time
Automatic Master Slave functions
On Hook ............................... Call waiting and automatic loop closing
Off Hook ......................................... Transfer of Master’s commands
Transfer of test results
16-6
ELQ 30A
16.3
16.3 End to End Manual Tests
End to End Manual Tests
Noise with Tone Measurement
Transmitter
Impedance............................................................................ 600 Ohm
Test signal ............................................................................. 1020 Hz
Output level .............................................................................. 0 dBm
Receiver
Impedance............................................................................ 600 Ohm
Measuring range ............................................................ 0 to -80 dBm
Weighting filters ................................................. Psophometric (O.41)
1020 Hz Notch (O.132)
Measurement times ............................................................ 1s to 30 min
Group Delay Distortion Measurement
Transmitter
Impedance ........................................................................... 600 Ohm
Test signal .................................................. 36MTTS, 200 to 3700 Hz
Resolution ................................................................................ 100 Hz
Output level.............................................. -20 dBm/tone (3dBm peak)
Receiver
Impedance ........................................................................... 600 Ohm
Input level range .................................................... -50 to -10 dB/tone
Group delay distortion range ............................................... 0 to 5 ms
Resolution .................................................................................... 1 µs
Reference ................................. Smallest, 800 Hz, 1000 Hz, 1800 Hz
Phase Jitter & Frequency Error Measurement
Transmitter
Impedance ........................................................................... 600 Ohm
Test signal ................................................................................. 1020 Hz
Output level .................................................................................. 0 dBm
Receiver
Input level range ............................................................. 0 to -30 dBm
Phase Jitter measurement (O.91)
Measuring range ............................................ 0.2 to 30.0 degrees p-p
Filter .................................................................................. 4 to 300 Hz
Frequency Error Measurement
Measuring range ..................................................................... ± 30 Hz
Resolution ................................................................................. 0.1 Hz
16-7
16.3 End to End Manual Tests
ELQ 30A
Simultaneous Event Counter
Transmitter
Impedance ........................................................................... 600 Ohm
Test signal ..............................................................................1020 Hz
Output level ...............................................................................0 dBm
Receiver
Impedance ........................................................................... 600 Ohm
Input level range ............................................................ 0 to -30 dBm
Measurement times ................................................. 5, 15, 30, 60 min
Maximum count for each counter ............................................. 65000
Amplitude Hit Counter (O.95)
Threshold range ....................................................................2 to 9 dB
Guard interval ............................................................................. 4 ms
Dead time......................................................................... 125± 25 ms
Dead time after interruption (>10 dB drop) .................................... 1 s
Phase Hit Counter (O.95)
Threshold range .....................................................................5 to 45 °
Guard interval ............................................................................. 4 ms
Dead time......................................................................... 125± 25 ms
Interruption counter (O.61)
Threshold ...............................................................................6, 10 dB
Guard interval ............................................................................. 2 ms
Dead time............................................................................... 3± 1 ms
Impulsive Noise counter (O.71)
Filter ............................................................................ 1020 Hz Notch
Guard interval ............................................................................ 20 µs
Dead time........................................................................ 125 ± 25 ms
Threshold range ............................................................. 0 to -50 dBm
16-8
ELQ 30A
16.4
16.4 Automatic Single Ended Test Sequences
Automatic Single Ended Test Sequences
DMM Tests
AC, DC Voltage .................................................................... a-b, a-E, b-E
Insulation Resistance ........................................................... a-b, a-E, b-E
Capacitance ................................................................... Cm, Ca-E, Cb-E
Selectable Line Tests
Loss ......................................................................................... Estimation
Noise .............................................................. Measurement at near end
Estimation at far end
LCL Balance ...................................................................... Measurement
Return Loss ............................................................................. Estimation
Impedance ............................................................................... Estimation
NEXT ....................................................................................... Estimation
Calculations (Predictions)
S/N ..................................................................................... near & far end
Data Transfer Speed ..................................................Up& Down Stream
Bit allocation (b) ......................................................... For VDSL & ADSL
Predefined Parameter Sets
VDSL 2 ................................. OVER ISDN, OVER ISDN WITHOUT US0
OVER POTS, OVER POTS WITH EXTENDED US0
ADSL 2+..................................................................... Annex A, B, I, J, M
ADSL 2 ....................................................................... Annex A, B, I, J, M
ADSL ...................................................................................... Annex A, B
ADSL G.Lite2 .......................................................................... Annex A, I
READSL2 .................................................................................... Annex L
SHDSL ................................................................................... Annex B, E
HDSL..................................................................................... 2B1Q, CAP
ISDN....................................................................Basic rate, Primary rate
User Defined Test Parameters
AC, DC Voltage ........................................................................ Maximum
Insulation Resistance ................................................................ Minimum
16-9
16.5 Automatic Master Slave Test of xDSL Lines
16.5
ELQ 30A
Automatic Master Slave Test of xDSL Lines
Selectable Line Tests
Loss ................................................................................... Measurement
Noise .................................................................... Bilateral Measurement
LCL Balance ........................................................ Bilateral Measurement
Return Loss ......................................................... Bilateral Measurement
Impedance ........................................................... Bilateral Measurement
NEXT ................................................................... Bilateral Measurement
FEXT .................................................................... Bilateral Measurement
Calculations
S/N ....................................................................... Bilateral Measurement
Data Transfer Speed ............................... Up& Down Stream Calculated
Bit allocation (b) .........Up& Down Stream Calculated for VDSL & ADSL
Predefined Parameter Sets
VDSL 2................................ OVER ISDN, OVER ISDN WITHOUT US0
OVER POTS, OVER POTS WITH EXTENDED US0
ADSL 2+ ..................................................................... Annex A, B, I, J, M
ADSL 2........................................................................ Annex A, B, I, J, M
ADSL....................................................................................... Annex A, B
ADSL G.Lite2 ........................................................................... Annex A, I
READSL2 .................................................................................... Annex L
SHDSL .................................................................................... Annex B, E
HDSL ..................................................................................... 2B1Q, CAP
ISDN ................................................................... Basic rate, Primary rate
ESEL Measurement
Measuring range .............................................................. Up to 120 dB
ESEL Dependent Templates
Applicable ........................................................ For all ADSL 2+ Systems
Selectable ESEL values .........................................................0 to 120 dB
ESEL steps ....................................................................................... 1 dB
16-10
ELQ 30A
16.6
16.6 Automatic Master Slave Test of VF circuits
Automatic Master Slave Test of VF circuits
Test Objects
Passive Leased Circuit ................................................................... Cable
Active Leased Circuit ............. Containing amplifiers or digital equipment
Switched Circuit .............. Master & Slave communicates over exchange
Selectable Line Tests
Loss ..................................................................... Bilateral Measurement
Noise ................................................................... Bilateral Measurement
Total distortion ..................................................... Bilateral Measurement
LCL Balance ........................................................ Bilateral Measurement
Return Loss ......................................................... Bilateral Measurement
Impedance ........................................................... Bilateral Measurement
Group Delay Distortion ........................................ Bilateral Measurement
Phase Jitter & Frequency Error ........................... Bilateral Measurement
Simultaneous Event Test .................................... Bilateral Measurement
Predefined Parameter Sets
M 1020 ............................................................ Active, Passive, Switched
M 1025 ............................................................ Active, Passive, Switched
M 1040 ............................................................ Active, Passive, Switched
16-11
16.7 TDR Measurements
16.7
ELQ 30A
TDR Measurements
Measuring Modes
Single Pair
Short time ........................................................................................ L1
Short time automatic............................................................. L1 AUTO
Long time .................................................................................... L1 LT
Comparison to memory
Living line & memory ................................................................L1 & M
Living line - memory .................................................................... L1-M
XALK ..............................................................................................XTALK
XALK automatic .................................................................XTALK AUTO
Impedance ................................................................................. 100 Ohm
Measuring ranges ......................................... 16, 32, 64, 160, 320, 640 m
1.6, 3.2, 6.4, 16, 32 km
Zoom ................................................................................................ 1 to 5
Gain range ................................................................................0 to 90 dB
Measuring pulse
Width .................................. 6, 10, 30, 60, 100, 300, 600 ns 1, 3, 6 µs
Amplitude .......................................................................................~3 V
Propagation velocity
V ..................................................................................... 90 to 299m/µs
V/2 ................................................................................. 45 to 150 m/µs
PVF .................................................................................... 0.3 to 0.999
Accuracy ................................................................................. ±0.5% ±1m
16.8 High Impedance Probe
Frequency range ............................................................ 5 kHz to 30 MHz
Attenuation .......................................................................................15 dB
Input Impedance ................................................................ 5 kOhm II 5pF
Accuracy
5 kHz to 25 kHz ............................................................................. ±1dB
25 kHz to 5 MHz ........................................................................±0.3 dB
5 MHz to 30 MHz ........................................................................... ±1dB
16-12
ELQ 30A
17
17 ORDERING INFORMATION
ORDERING INFORMATION
COPPER QUALIFIER ELQ 30A ........................................433-000-000
Including:
Operating Manual .............................................. OM433-015-011 xE
Calibration Certificate ........................................... CC433-000-000 E
CD (xxx version) ................................................... CD433-905-xxx E
Measuring cable yellow ...................................................... Y107-444
Measuring cable green....................................................... Y107-445
2 pcs Special Balanced Measuring Cable (L1, L2) ............ Y107-446
USB cable ......................................................................... Y107-389
USB stick ........................................................................... Y146-019
Mains adapter ................................................................... Y107-017
Battery (built-in) .......................................................... 355-140-000B
Carrying case ..................................................................... Y147-014
6 Alligator clips
HW Options
High Impedance Probe ELQ P30 .................................. 410-000-000
TDR measuring unit (built in) ......................................... 433-210-000
Loop closing device ELC 30 .......................................... 421-000-000
Car lighter power adapter EAA 10 ................................. 367-000-000
Basic SW Options
PC control program. ................................................ SW 433-510-000
Interruption measurement ...................................... SW 433-530-000
SW Set for Spectrogram .......................................... SW 433-570-000
Spectrum Reference Template................................ SW 433-580-000
Spectral Trace as Reference ................................. SW 433-550-000
Single ended loss meas. ......................................... SW 433-640-000
Voice Frequency SW Options
VF Group delay meas.............................................. SW 433-670-000
VF Jitter & fr. Difference meas. ............................... SW 433-560-000
VF Echo meas. ....................................................... SW-433-630-000
VF Event counter ..................................................... SW 433-540-000
17-1
17 ORDERING INFORMATION
ELQ 30A
Advanced SW Options
ESEL Measurement ................................................ SW 433-600-000
ADSL ESEL Dependent Template.......................... SW 433-610-000
ADSL DPBOMUS Template. .................................. SW 433-620-000
ADSL Annex J......................................................... SW 433-700-000
VDSL DPBO Template. .......................................... SW-433-810-000
VDSL MUS Template. ............................................ SW-433-820-000
VDSL UPBO Template. .......................................... SW-433-900-000
VDSL Vectoring. ..................................................... SW-433-910-000
Bridge SW Options
Loaded cable .......................................................... SW-433-650-000
Multi section cable .................................................. SW-433-660-000
Others
Calibration Report for ELQ 30A ..............................CR 433-000-000 E
17-2
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