Telecom component characterisation
3261A Telecom Unit forms the core of a comprehensive component test
system. It is configured in conjunction with the Wayne Kerr 3260B
Precision Magnetics Analyzer to carry out a wide variety of telecom-related
measurements.
Telecoms Fixture model 1008 further enhances the test capability
by providing an interface to connect units under test such as transformers.
Complete telecom transformer characterization
Automatic production testing of telecom transformers is available
with the 3261A. Transformers are characterized at the press of
a button.
Total Harmonic Distortion
Providing unrivalled Total Harmonic Distortion (THD) performance
this optional function displays the second, third, fourth and fifth
harmonic as well as THD. Measurements as low as -110 dB can be
carried out; the user can set a large number of preset fundamental frequencies
from 150 Hz to 200 kHz.
Longitudinal balance and transverse balance
This optional function provides longitudinal balance and transverse
balance measurements in line with IEEE 455, ITU recommendation O.9 (O.121)
and FCC 68.310 over the frequency range 200 Hz to 3 MHz.
Measurement capability is high, longitudinal balance accuracy is
±1 dB over 80 dB, ensuring that devices can be measured with confidence.
The longitudinal and transverse balance of any component can be completely
characterized graphically across the full frequency band enabling component
performance to be analyzed in more detail.
Insertion Loss and Return Loss
3261A Telecom Unit measures Insertion Loss and Return Loss from 20
Hz to 3 MHz on transformers and POTS splitters.
The instrument can also measure and display many parameters including
Insertion Loss and Return Loss against frequency in a graphical form
- ideal in a design or development environment.
Swept measurements in graphical form
It is often important to characterize component performance outside
its operating range, especially during component design. The 3261A allows
Insertion Loss, Return Loss, transverse and longitudinal balance, and
the usual basic transformer parameters, such as Inductance and interwinding
capacitance, to be displayed graphically.
Sweeping the full frequency band for the particular measurement the
user can identify the maximum and minimum point on the graph and a moveable
marker displays the frequency and level. The graph axes can be selected
as either a logarithmic or linear scale.
Comprehensive test system
The key to the test system’s versatility and accuracy is the combination
of a precision impedance analyzer with a dedicated telecomms test unit.
This combination provides many advantages.
Where special interface methods are needed the 1008 Telecoms Fixture
is available, or customised fixtures can be configured using a blank
fixture to ensure high integrity measurements.
3261A Telecom Unit test system incorporating
3260B Precision Magnetics Analyzer and Telecoms Fixture 008
ADSL, ISDN and HDSL analogue line matching transformers and POTS
splitters
ADSL technology requires tighter specifications and additional measurements
when testing line matching transformers. The 3261A provides all
the required measurements and performance for ADSL technology, including
Total Harmonic Distortion, longitudinal and transverse balance, Insertion
Loss and Return Loss.
It not only exceeds the required specifications but also makes all
the measurements automatically from the same fixture. For the
user it is just a case of connect and test, ideal in a production environment,
with no complex set-ups, special jigs or the need to calculate the result
from a number of voltage measurements - the 3261A does it all.
The user is able to select the required line side termination from
a list of predetermined values. Equipment side terminations are provided
by the user and can be connected to the appropriate socket on the 3261A.
Once the termination has been fitted no further interaction is required
by the user.
Accurate DC bias current
DC bias current can be selected for Insertion Loss, Return Loss and
Total Harmonic Distortion.
This function provides high accuracy user selectable DC current in
the range 1 mA to 200 mA in 0.1 mA steps (to 20 mA) and 1 mA steps (to
200 mA).
The total production test solution ... in a single fixture
Replacing many discrete instruments, complex jigs and difficult measurements,
the 3261A Telecom Unit provides all the functions needed to meet the
new telecom standards in a single multi-function unit.
It also replaces all the hard work, high skill levels and uncertainty
of manual testing by handling all the complexity internally and presenting
the user with the information required quickly and accurately. In a
production environment it is just a case of connect and test.
All the user has to do is press the start button and the 3261A Telecom
Unit makes all the measurements and displays a Pass/Fail banner.
Technical Specifications
General
Line side termination: 50, 75, 100, 120, 135, 600, 900 Ω
Equipment side termination: Customer is required to supply centre tapped
1% resistor
Insertion Loss
| Drive level*: |
-65 dBm to +20 dBm |
| Drive level units: |
dBm, dBµV, V |
| Frequency range: |
20 Hz to 3 MHz |
| Basic Accuracy**: |
0 to -3 dB ±0.1 dB |
|
| *Varies with DUT impedance |
| **Varies with frequency |
Return Loss
| Drive level*: |
-60 dBm to +25dBm |
| Drive level units: |
dBm, dBµV, V |
| Frequency range: |
20 Hz to 3 MHz |
| Basic Accuracy**: |
0 to 25 dB ±1dB |
| 25 to 30 dB ±2 dB |
| 30 to 35 dB ±3 dB |
|
| *Varies with DUT impedance |
| **Varies with frequency |
Transverse balance (analogue voiceband)
Drive level: 0 dBm (0.775 V rms)
Frequency range: 200 Hz to 10 kHz
Basic Accuracy: to 80 dB ±1 dB
Transverse balance (digital)
Drive level: 0 dBm (0.316 V rms)
Frequency range: 10 kHz to 3 MHz
Basic Accuracy:
to 55 dB ±1dB (≤1.55 MHz)
to 45 dB ±1dB (>1.55 MHz)
45 dB to 55 dB ±3 dB (>1.55 MHz)
Longitudinal balance (analogue voiceband)
Drive level: 1 V rms
Frequency range: 200 Hz to 10 kHz
Basic accuracy: to 80 dB ±1 dB
Longitudinal balance (digital)
Drive Level: 0 dBm
Frequency Range: 10 kHz to 3 MHz
Basic Accuracy:
to 55 dB ±1 dB (10 kHz to 1.1 MHz)
to 45 dB ±1 dB (>1.1 MHz)
45 dB to 55 dB ±3 dB (>1.1 MHz)
Total Harmonic Distortion
Maximum drive level: 6 V rms (±2%) at the DUT
Drive level units: Vrms, Vp-p, dBm
Frequencies: 150, 300, 500, 600, 5k, 10k, 15k, 20k, 25k, 30k, 40k, 50k,
100k, 150k and 200 kHz
DC bias current
Output current: 1 to 200 mA
Step size: 0.1 mA (1 to 20mA), 1mA (20 to 200 mA)
Basic accuracy: ±1% ±1 µA (1 to 20 mA), ±1% ±10µA (20 to 200 mA)
Compliance voltage: 22.5 V (into line side termination)
Power Supply
Input voltage: 115 V AC ±10% or 230 V AC ±10% (selectable)
Frequency: 50/60 Hz
Environmental
Installation category: II (in accordance with IEC664)
Temperature range: Storage -40°C to 70°C,
Operating 0°C to 40°C.
Full accuracy 15°C to 35°C.
Relative humidity: up to 80% non-condensing
Pollution degree: 2 (mainly non-conductive)
Altitude: up to 2000 m
Safety
Complies with the requirements of EN61010-1
EMC
Immunity: EN61326-1
Emissions: EN55022 Class A
Mechanical
Height: 150 mm (6″)
Width: 440 mm (17 3/8″)
Depth: 520 mm (20 1/2″)
Weight: 14 kg
Order codes and options
3261A Telecom Unit
Supplied with mains lead, user manual, 8 BNC and link interconnecting
leads (for connection between 3260B and 3261A), 1JBLANK fixture,
short circuit trim fixture and HF compensation fixture |
|
1J3261B |
|
| Note: - The 3261A can only be used in conjunction
with the 3260B Precision Magnetics Analyzer. |
|
Options
|
| Total Harmonic Distortion |
|
add /A to part number |
| Longitudinal and Transverse Balance |
add /B to part number |
|
Accessories
|
| Telecom Fixture |
|
1J1008 |
| Telecom Production Test Software |
PT3261 |
| Blank fixture containing PCB and pins
allowing the user to adapt the fixture for a specific component. |
1JBLANK |
| Device specific fixture for a customer transformer |
1JFIXTURE-01 |
|
| Note: - The customer should provide a
drawing and sample of the particular transformer requiring a
fixture |
|
