HP 33120a schematic

User’s and Service Guide

Publication Number 33120-90022 Edition 2, March 2002

For Safety information, Warranties, and Regulatory information, see the last page in this manual.

Agilent 33120A Option 001 Phase-Lock Assembly

Chapter 1 Quick Start

The Rear Panel at a Glance 3 The Front-Panel Menu at a Glance 4 To phase lock to an external clock signal 5 To phase lock multiple function generators 7 To set a zero phase reference 9 To phase lock using the triggered burst mode 10 To generate a phase unlock error 14

Chapter 2 Remote Interface Operation

SCPI Command Summary 17 Phase-Lock Commands 18 Simplified Programming Overview 20 The SCPI Status Registers 23 Status Reporting Commands 26 Phase-Lock Error Messages 26

Chapter 3 Specifications 27

Chapter 4 Replaceable Parts and Schematics

To Order Replaceable Parts 30 Replaceable Parts Lists 31 Manufacturer’s List 33 33120-66503 Component Locator Diagram 34 33120-66503 Schematic Diagram 35

Index 37

Quick Start

This manual contains supplemental information for the Agilent 33120A Phase-Lock assembly. Refer to the 33120A User’s Guide and Service Guide for complete details on using the function generator.

The Phase-Lock assembly (Option 001) adds the following capabilities to the 33120A Function / Arbitrary Waveform Generator:

 External clock input and output connectors on the rear panel.

These connectors allow synchronization between multiple 33120As or to an external 10 MHz clock signal.

 Phase offset control from the front panel or over the remote interface.

 Simultaneous hardware triggering of multiple Agilent 33120As.

Option 001 allows the 33120A to generate a trigger pulse from the Ext Trig terminal which can be routed to other instruments in a system.

 2 ppm timebase—10 times the frequency stability of the standard

Agilent 33120A.

If you have questions relating to the operation of the function generator, call

1-800-452-4844 in the United States, or contact your nearest

Agilent Technologies Sales Office.

Chapter 1 Quick Start

The Rear Panel at a Glance

The Phase-Lock assembly adds the Ref Out and Ext Ref In terminals to allow synchronization between multiple 33120As or to an external 10 MHz clock signal.

1 Internal 10 MHz reference output terminal 2 External 10 MHz reference input terminal 3 Chassis ground 4 Power-line fuse-holder assembly 5 Power-line voltage setting

6 AM modulation input terminal 7 External Trigger / FSK / Burst modulation

input terminal

8 GPIB (IEEE-488) interface connector 9 RS-232 interface connector

Chapter 1 Quick Start

The Front-Panel Menu at a Glance

The Phase-Lock assembly adds the Phase Menu to the front-panel menu.

The menu is organized in a top-down tree structure with three levels.

G: PHASE MENU

1: ADJUST Õ 2: SET ZERO Õ 3: TRIG OUT Õ 4: UNLOCK ERR

1: ADJUST 2: SET ZERO 3: TRIG OUT 4: UNLOCK ERR

Sets the phase offset of the output waveform to a value in degrees. Nulls the phase offset to a zero reference for relative adjustments. Enables or disables an external trigger from the Ext Trig terminal. Enables or disables error generation when phase-lock is lost.

Chapter 1 Quick Start

To phase lock to an external clock signal

The rear-panel Ext Ref In terminal allows you to synchronize one or more function generators with an external 10 MHz signal. The following steps show you how to configure a single instrument for synchronization with an external signal.

External

10 MHz

Signal

Freq

1 Select the function and set the output frequency to 10 MHz.

You must select either sine or square wave since the other output waveforms cannot be used up to 10 MHz.

10.000,000 MHz

To adjust the phase offset, you will use the front-panel menu as described on the following page.

Chapter 1 Quick Start

To phase lock to an external clock signal

Shift

Menu On/Off

2 Turn on the menu.

A: MOD MENU

3 Move across to the

PHASE MENU choice on this level.

G:PHASE MENU

4 Move down a level to the

ADJUST command.

1: ADJUST

5 Move down a level and set the phase offset.

You can set the offset to any value between -360 degrees and +360 degrees. The displayed phase is output “real time” unless you have selected the arbitrary waveform function.

¾000.000 DEG

Enter

6 Turn off the menu.

The function generator beeps and displays a message. You are then exited from the menu.

At this point, the function generator is phase-locked to the external clock signal with the specified phase relationship. The two signals will remain locked unless you change the function or output frequency.

Chapter 1 Quick Start

To phase lock multiple function generators

The rear-panel Ref Out and Ext Ref In terminals allow you to synchronize multiple function generators. The diagram below shows how to make connections for the “real-time” phase-lock mode. In the real-time mode, the phase offset relationship is random at first. You can adjust the phase offset “real time” from the front panel. The following steps show you how to synchronize two function generators at 10 kHz.

Freq

1 Set both instruments to the same output frequency.

You can select sine, square, ramp, or triangle waveforms for phase-lock operation. You cannot perform real-time phase adjustments on arbitrary waveforms.

10.000,000 KHz

To adjust the phase offset, you will use the front-panel menu as described on the following page.

Chapter 1 Quick Start

To phase lock multiple function generators

Shift

Menu On/Off

2 Turn on the menu.

A: MOD MENU

3 Move across to the

PHASE MENU choice on this level.

G:PHASE MENU

4 Move down a level to the

ADJUST command.

1: ADJUST

5 Move down a level and set the phase offset.

You can set the offset to any value between -360 degrees and +360 degrees. The displayed phase is output “real time” unless you have selected the arbitrary waveform function.

¾000.000 DEG

Enter

6 Turn off the menu.

The function generator beeps and displays a message. You are then exited from the menu.

At this point, the two function generators are phase-locked with the specified phase relationship. The two signals will remain locked unless you change the function or output frequency.

Chapter 1 Quick Start

To set a zero phase reference

After selecting the desired phase relationship as described on the previous pages, you can set a zero-phase point. The function generator then assumes that its present phase is zero and you can adjust the phase relative to this new “zero”.

Shift

Menu On/Off

1 Turn on the menu.

A: MOD MENU

2 Move across to the

PHASE MENU choice on this level.

G:PHASE MENU

3 Move down a level and then across to the

SET ZERO command.

2: SET ZERO

4 Move down a level to set the zero phase reference.

The displayed message indicates that the phase reference will be set to zero degrees (you must exit the menu to select the displayed value).

PHASE = 0

Enter

5 Save the phase reference and turn off the menu.

The function generator beeps and displays a message to show that the change is now in effect. You are then exited from the menu.

Chapter 1 Quick Start

To phase lock using the triggered burst mode

The rear-panel Ref Out and Ext Ref In terminals allow you to synchronize multiple function generators. The diagram below shows how to make connections for the “triggered burst” phase-lock mode. In the triggered burst mode, you can synchronize phase-lock signals using an external trigger from the rear-panel Ext Trig terminal. The following steps show you how to synchronize two function generators at 10 kHz in the triggered burst mode.

Freq

1 Set both instruments to the same output frequency.

You can select sine, square, ramp, or triangle waveforms for phase-lock operation. You cannot perform real-time phase adjustments on arbitrary waveforms.

10.000,000 KHz

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HP 33120a schematic

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