Audio/Telecom Back To Applications
The accuracy and high frequency performance of the AT3600 make it ideal for testing audio transformers and telecommunications transformers used in modems, Ethernet adaptors and DSL filters.
What's needed to test audio and telecom transfomers?
- Making accurate measurements at high frequency
- Controlling the source and load impedances
- Compensation for stray impedances
- Calculation of results in dB to the reference international standard.
The AT3600 provides:
- Fully programmable sources which provide accurate measurements up to 3MHZ
- Laboratory LCR meter grade measurements (0.05% basic accuracy)
- Control both source and load impedances by automatic and repeatable fixture connections
- Calculates and presents results in accordance to formulae as defined by current international standards.
Voltech have developed the following specific tests to ensure the correct operation of the transformer in this application:
Longitudinal Balance Test (LBAL): 0 to 100dB, 1mV to 5V, 20 Hz to 3MHz.
The longitudinal balance test will measure what is effectively the Common Mode Rejection Ratio of a transformer which is designed to connect to a balanced line. Two measurements are performed each applying a voltage to the transformer and measuring the resulting voltage to calculate the CMRR.
General Longitudinal Balance Test (GBAL): 0 to 100dB, 1mV to 5V, 20 Hz to 3MHz.
In order to assess a transformers CMMR to the IEEE455, FCC68.310 and other similar standards, a slightly different version of the basic longitudinal balance test is required. This is known as the General Longitudinal Balance test.
Insertion Loss Test (ILOS): -100dB to +100dB, 1mV to 5V, 20 Hz to 3MHz
The insertion loss test measures the output power delivered by a transformer to a load, relative to the maximum power theoretically available. This test checks the effective losses in the transformer due to the core material and winding materials when used in its application.
Frequency Response Test (RESP)
The frequency response test is used to check that the variation in power loss of a telecommunications or audio transformer over a specified frequency range is less than specified limits.
Return Loss Test (RLOS): 1mohm 1Mohm
The return loss measurement measures the impedance mismatch between the transformer and a transmission line of specified impedance.
Further test are available, please see:
AT3600 Tests
All of these tests can be specified with both an AT3600 can be purchased as simple software upgrades by existing customers.
All tests can be configured and executed via PC based transformer test editor software and test programs and results can be archived onto a PC server.
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