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 |
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*Varies with DUT impedance
**Varies with frequency |
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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 |
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*Varies with DUT impedance
**Varies with frequency |
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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. |
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Options |
Total Harmonic Distortion |
add /A to part number |
Longitudinal and Transverse Balance |
add /B to part number |
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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 |
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