Agilent Technologies 81134A Instrukcja Użytkownika Pobierz pdf (Strona 2)

Connectors

Front Panel Connectors

All signal outputs and inputs are accessible at the front panel. These are:

· 2 (or 4) Output Connectors for the 1 (or 2) differential channel(s)

· Trigger Output

· Clock Input

· Start Input

· 1 (or 2) Delay Control Input(s) for the 1 (or 2) channel(s)

Rear Panel Connectors

Remote programming interfaces: GPIB, LAN, USB (see also ‘Additional Features’)

Clock Source

Selecting the clock source determines the origin of the time base. All other timing parameters are derived

from it. There are two choices:

· Internal

The Clock is derived from the internal YIG oscillator.

· External

The Clock is derived from the external input. The frequency is measured and used to calculate frequency

dependant values including the pulse width or phase if set to duty cycle mode or phase mode respectively.

· External 10MHz Reference

A 10 MHz reference clock can be applied to the clock input. This clock is used as a reference for all timing

parameters.

· Direct Mode (Direct Internal/Direct External)

The direct modes allow changes of frequency without dropouts in the range of 1:2.

This can be used for applications, where dropouts would make a measurement impossible (e.g.: PLL frequency

sweep, micro processor clock sweep). In both direct modes, the delay and deskew of all channels is set to zero

(deskewed at the connectors) and can't be changed. Square mode, data mode (NRZ only) and PRBS mode

(NRZ only) are available. In ‘Direct External’ mode the PLL is bypassed and the instrument follows the

external frequency exactly.

Frequency/Period

The main frequency is set for all channels. The frequency can be divided further for each channel

individually. The frequency can also be set as period.

Main Modes

· Pulse/Pattern Mode

In pulse/pattern mode, each channel can be set independently to one of the channel modes described in

'Channel Modes'.

· Burst Mode

Burst mode enables the output of a burst consisting of data repeated N times followed by continuous zero

data. It can be started either by: ·applying a signal at the start input.

·the start button.

·sending a command through the remote connections.

· Repetitive Burst Mode

This command selects a repeated burst consisting of data repeated N times followed by a pause of P times

zeros of the same length as the data before the data is repeated.

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