The Level Test Set ET 91 is a hand held battery operated, multifunction measuring instrument, intended for the test of Carrier Frequency Systems up to 600 channel capacity, Power Line Carrier, Audio Tone, and FSK Communications Systems.
In selective receiving mode four special bandwidths are provided for the measurement of noise, carrier leak, crosstalk and non-linear distortion.
Four ins...
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The Level Test Set ET 91 is a hand held battery operated, multifunction measuring instrument, intended for the test of Carrier Frequency Systems up to 600 channel capacity, Power Line Carrier, Audio Tone, and FSK Communications Systems.
In selective receiving mode four special bandwidths are provided for the measurement of noise, carrier leak, crosstalk and non-linear distortion.
Four instruments in one
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100Hz to 2400 kHz Level Generator: For the generation of measuring voltage for the test of FDM transmission systems up to 600 channels
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100Hz to 2400 kHz Level Meter: For selective and wideband level measurements with auto ranging
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Spectrum Analyser: For the measurement of transmission characteristics as well as cross-talks and other interference signals.
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Easy Frequency Setting Modes: Test instructions of FDM systems often specify the test frequency in format: Carrier ± Channel Frequency. In compliance with the mentioned format ET 91 provides the separate setting of carrier and audio frequencies and so no frequency calculation is required!
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Comfortable Frequency Tracking Modes: The test procedure of FDM equipment usually requires different generator and level meter frequency settings.
For example, feeding audio frequency test signal to the input of the tested channel on the following frequencies:
1000, 1200, 1400, 1600, etc Hz
Selective level measurement at a designated test point of the tested equipment on the following frequencies:
Carrier + 1000, 1200, 1400, 1600, etc Hz or
Carrier - 1000, 1200, 1400, 1600, etc Hz
In ET 91 the generator and the level meter are in the same instrument, so extremely comfortable tracking modes are provided. In these modes the selective level meter is controlled by the generator according to the above mentioned rules. No frequency calculation is required! Only one frequency setting is required!
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Comfortable End to End Measurements: For the test of carrier frequency cables and voice channels in Master-Slave mode. 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. The two instruments communicate over the tested line.
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High Resolution Spectrum Analyser: ET 91 provides a high sensitivity spectrum analyser suitable for the measurement of transmission characteristics as well as cross-talk and other interference signals. The obtained spectrum trace can be evaluated in four modes like: NORM, PEAK, AVG, SAVG and interpreted in dBm or dBm/Hz
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Measuring Bridge: ET 91 provides a built in bridge to perform the measurement of Return Loss, Impedance and LCL Balance according to ITU-T Rec. O.9.
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Memory Locations for Test Setups: To speed up routine tests ET 91 provides memory locations for 100 user defined test setups containing generator, level meter test parameters and limit values for PASS/FAIL indication
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USB Ports for Result and Setup Transfer: ET 91has two USB ports for data transfer:
USB A host port for USB stick
USB B device port for PC connection
The USB stick provides data transfer between a PC and ET 91 without installing a special device driver to the PC. This solution is advantageous for the user who does not have administrative right to install a special driver to his PC. PC program for data transfer is provided.
