1. Long Time Spectrogram Measurement with ET 91 The results are displayed on a 3 dimension picture ■ The time is on the vertical axis ■ The frequency is on the horizontal axis ■ The level is interpreted in form of colours When the supporting device is a PC: ■ ET 91 is interconnected with the PC and remote controlled by the PC ■ The results are stored in a user defined file of the PC. ■ The actual and all the earlier obtained results can be continuously studied on the PC display When the supporting device is an USB stick: ■ The results are stored in a user defined file of USB stick ■ The actual results can be studied on the display of ET 91 ■ To see the earlier obtained ones the result file should be transferred to a PC where they can be displayed by using the ET 91c control program. The Spectrogram PC Program is an excellent tool to discover the disturbers causing considerable service impairment to communication systems. The biggest problem is that long time spectrum observation is necessary because the disturbers appear in unpredictable times and frequency ranges. Utilizing the large memory capacity of a PC or USB stick the Spectrogram PC Program allows the storage of spectrum measurement results up to 72 hours with a resolution of 1 second. ELEKTR NIKA

2. Introduction of Display Field Frequency Time ← ← The display field is vertically shared into two parts to show two different things at the same time. For example: ■ The three dimension spectrogram (down) with a user controlled time designating white arrow ■ The measured spectrum in the user designated time (upper) ELEKTR NIKA

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