Agilent Technologies InfiniiVision 7000B Series Guida Utente Scaricare il pdf (Pagina 406)

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15 Reference

406 InfiniiVision Oscilloscopes User’s Guide

Using the 10 MHz reference clock

The 10 MHz REF BNC connector on the rear panel is provided so you can:

• Supply a more accurate sample clock signal to the oscilloscope, or

• Synchronize the timebase of two or more instruments.

Sample clock and frequency counter accuracy

The oscilloscope’s timebase uses a built-in reference that has an accuracy of 15 ppm.

This is sufficient for most uses. However, if you are looking at a window that is very

narrow compared to the selected delay (for example, looking at a 15 ns pulse with the

delay set to 1 ms), significant error can be introduced.

Using the built-in sample clock, the oscilloscope’s hardware frequency counter is a 5-digit

counter.

Supplying an external timebase reference

When you supply an external timebase reference, the hardware frequency counter is

automatically changed to an 8-digit counter. In this case, the frequency counter ([Quick

Meas]

&Select&Counter) is as accurate as the external clock.

For more information on the hardware frequency counter, see “Counter” on page 199.

To supply a sample clock to the oscilloscope

1 Connect a 10 MHz square or sine wave to the BNC connector labeled 10 MHz REF. The

amplitude must be between 180 mV and 1 V, with an offset of between 0 V and 2 V.

2 Press [Utility]&Options&Rear Panel&Ref Signal.

3 Use the Entry Knob and the Ref Signal softkey to select 10 MHz input.

CAUTION

Maximum input voltage at 10 MHz REF connector: Do not apply more than ±15 V at

the 10 MHz REF BNC connector on the rear panel or damage to the instrument may

occur.

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