In the base band designing phase for cellular phones, a voice test is done to observe voices from the microphone speaker and wireless signal components such as mixed digital/analog multi-channel input/output. Then monitoring is done when each part degrades.

The cellular phone controls the complex timing in the base band. The Long Memory Digital Oscilloscope DL7440/DL7480 uses long duration high-speed sampling to test if the internal controls work properly. It measures the shift of the analog input waveform from wireless components, serial input after A/D conversion, analog input/output of microphone and speaker voice, and the serial input/output. The History memory enables capturing of rare phenomena, and the ZOOM function enables observation of the details in long data, and printing of the zoomed image. Also data saving on FD, Zip^® and PC card is available.

- High-speed sampling
- Large recording memory
- Max. eight inputs - 16-bit logic input (DL7440/DL7480)
- 16-bit logic input (DL7440/DL7480)
- Data saving (3.5 FDD, Zip^® drive or PC card drive)
- Compact and portable
- Color display

-Observe voices when the connection quality degrades.
-Observe output from wireless parts when voices from microphone change.

- Pattern search
- Eight analog input channels (DL7480)
- 16-bit logic input
- History search
- Data saving(3.5 FDD, Zip^® or PC card)
- Zoom function
- Color display

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