LeCroy 9450A User Manual

I OPERATOR'S MANUAL

I

MODEL 9450A

DUAL-CHANNEL

DIGITAL OSCILLOSCOPE

Serial Number

May 1992

LeCroy

Corporate Headquarters

700 Chestnut Ridge Road

Chestnut Ridge, NY 10977-6499

Tel: [phone], TWX: 710-577-2832

European Headquarters

2, rue Pre-de-la-Fontaine

P.O. Box 341

1217 Meyrin 1/Geneva, Switzerland

Tel.: [phone], Telex: 419 058

Copyrightm May 1992, LeCroy. Ail rights reserved. information in this publication supersedes all earlier versions. Specifications subject to change.

TABLE OF CONTENTS

!	Table of Contents

8 Extended Pulse Parameters

Extended Parameters Display

Extended Parameters Setup

Extended Parameters List

9 The Rear Panel

Mains Voltage Selection (67)

Fuse Protection

Power Switch (66)

Accessory Power Connectors (73)

GPIB and RS-232-C Port Selection (70)

RS-232-C Connector (68)

Accessory Control (69)

BNC Connector (62)

External CK Input (62)

Sampling CK Output (63)

Trigger Out (64)

Trigger Veto (65)

Reset (71)

10 Getting Started

Waveform Acquisition

Saving and Recalling Front-Panel Setups

Storing and Recalling Waveforms

Waveform Expansion

Waveform Processing

11 Getting More from your Oscilloscope

Rapid Response of the Front-Panel Controls

Accurate Amplitude Measurements

Accurate Time Measurements

Auto-Calibration

12 Waveform Processing Option (WPO1)

Processing Capabilities

Summed Average

Continuous Average

Arithmetic

Extrema

Functions

Enhanced Resolution

?1

INITIAL INSPECTION

WARRANTY

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PRODUCT ASSISTANCE

MAINTENANCE

AGREEMENTS

GENERAL INFORMATION

It is recommended that the shipment be thoroughly inspected immediately upon delivery to the purchaser. All material in the container should be checked against the enclosed Packing List. LeCroy cannot accept responsibility for shortages in comparison with the Packing List unless notified promptly. If the shipment is damaged in any way, please contact the Customer Service Department or local field offlce immediately.

LeCroy warrants its oscilloscope products to operate within specifications under normal use for a period of two years from the date of shipment. Spares, replacement parts and repairs are warranted for 90 days. The instrument's firmware is thoroughly tested and thought to be functional, but is supplled "as is" with no warranty of any kind covering detailed performance. Products not manufactured by LeCroy are covered solely by the warranty of the original equipment manufacturer.

In exercising this warranty, LeCroy will repair or, at its option, replace any product returned to the Customer Service Department or an authorized service facility within the warranty period, provlded that the warrantor's examination discloses that the product 1s defectlve due to workmanship or materials and that the defect has not been caused by mlsuse, neglect, accident or abnormal conditlons or operation.

The purchaser is responsible for transportation and insurance charges for the return of products to the servicing facility. LeCroy wlll return all in-warranty products with transportation prepaid.

This warranty 1s in lieu of all other warranties, expressed or implied, including but not limited to any implied warranty of merchantability, fitness, or adequacy for any particular purpose or use. LeCroy shall not be liable for any speclal, Incidental, or consequential damages, whether in contract or otherwise.

Answers to questions concerning installation, calibration, and use of LeCroy equipment are available from the Customer Service Department, 700 Chestnut Ridge Road, Chestnut Ridge, New York 10977-6499, U.S.A., tel. [phone], and 2 , rue du Pre-de-la-Fontaine, 1217 Meyrin 1, Geneva, Switzerland, tel. [phone], or your local field engineering office.

LeCroy offers a selection of customer support services. Maintenance agreements provide extended warranty and allow the customer to budget maintenance costs after the initial two year warranty has expired. Other services such as installation, training, enhancements and on-site repair are available through specific Supplemental Support Agreements.

I

INTRODUCTION

ARCHITECTURE

Hi-Z, 50 Cl

Amplifiers t

Attenuators

PRODUCT DESCRIPTION

The LeCroy 9450A is a high-performance digital oscilloscope suited to a wide variety of research, design and test applications. It is used to capture, analyze, display and archive electrical waveforms in fields such as electronic engineering, physics and defense research, automated testing and measurement, telecommunications, laser research, computer design, electromagnetic pulse and interference measurement, lidar technology and ultrasonics research.

The 9450A features two 400 megasamplelsecond 8-bit Flash ADC systems, with 50K non-volatile memories for waveform acquisition and storage, and two 50K memories for waveform processing, expansion and temporary storage. High-speed internal data transfer and processing are performed using a multi-processor system. The central processor is a powerful Motorola 68020 microprocessor which performs computations and controls the oscilloscope's operation.

	Non-volat ile	RS-232-C
		-
		GPlB
	-Time base	68020 Micro-
		processor
		16 MHY
		4
		68881
		Reference
		Memory lOOK
		Processing
		Memory lOOK
	Display	Real Time
	Processor
		Clock
	t
	64 KB Memory
		Working Memory
		664 KB
		Program Memory
		750 KB
	9450A BLOCK DIAGRAM	v
	Figure 1

TRIGGER

Product D e s c r i ~ t i o n 7

Trigger Classes	Operatlonal Modes
Single-source trigger	Hold-off by time
Pattern trigger	Hold-off by number of events
	Pulse width >
	Pulse wldth < (FASTGLITCH)
	Interval width >
	Interval width <

State Qualified trigger TimelEvent Qualified trigger

TV trigger

Wait for a given time

Wait for a given event count

Trigger on a given line in a chosen field

additinn nerindir ralihratinn ic n ~ r f n r m e dtn enciire lnno term

	atelv to the left and right of the CRT.
	screen also presents internal status and	measurement results, as
	screen dump button. Plotting is done	in parallel with normal
MANUALIREMOTE	The front-M an el lavout and o~erationwill be verv familiar to users
	instantly on me nign

'

Peak and Glitch Detection

Horizontal Section

Tlme Base

Acquisition Modes

Product Description 2

Reference memories, C a n d D: Two 50K, 16-bit word memories which can store one acquired and/or processed waveform, or up to 200 waveform segments.

Function memories E a n d F: Two 50K, 16-bit word memories for waveform processing.

Minimum and maximum peaks, as fast as 0.002% of the record length (minimum 2.5 nsec), are captured and displayed with 100% probability.

Using LeCroy's FASTGLITCH trigger technique (see the trigger section below), glitches faster than 2.5 nsec can be detected on all time-base settings.

Range: 1 nsecldiv to 5000 secldiv. Clock accuracy: If 0.002%

Interpolator resolution: 5 psec. Interpolator accuracy: 20 ps RMS

Sampling clock output: BNC connector on rear panel. External clock in: BNC connector on rear panel.

Random Interleaved Sampling (RIS) for repetitive signals from 1 nsecldiv to 5 psecldiv.

Single shot for transient	signals and repetitive	signals from
10 nsecldiv to 200 msecldiv.
Roll for slowly-changing	signals from 500	msecldiv to
5000 sec/div.

Sequence mode divides the acquisition memory into 2, 5, 10, 20, 50, 100 or 200 segments.

Horizontal expansion: Dual zoom mode allows d~fferentsignals or different sections of the same signal to be expanded up to 1000 times.

Pre-trigger recording: Adjustable in 0.2% increments to 100% of full scale (grid width).

Post-trigger delay: Adjustable in 0.02 division increments up to 10,000 divisions.

External trigger input: 1 M a , < 20 pF, 250 V max. (DC + peak AC 10 kHz).

External trigger range: f 2 V in Ext, f 20 V in ExtIlO.

Display

Cursors

Remote Control

Probes

General

INSTALLATION

CAUTION

If a LeCroy oscilloscope set for 115 V is plugged into a 220 V power source, severe damage can occur. Before powering up the unit, ensure that the correct mains voltage has been set.

DISPLAY LAYOUT

I	Real-time clock field	VI	Abridged trigger fleld
II	Menu field	VII	Abrldged front-panel status field
Ill	Icon field	Vlll Displayed trace field
IV	Trigger delay field	IX	Message field
V	Time and frequency field	X	Trigger level field

ICON FIELD (111)

TRIGGER DELAY FIELD (IV)

CH2 0 . 2 mV DC

n

Trigger source: Channel 2

Trigger level: 0.2 mV

Trigger coupling: DC

SPECIAL LeCROY TRIGGER GRAPHICS INDICATE the

SLOPE and LEVEL of the TRIGGER

Figure 3

NJ or 9U1W TRIGER

EXAMPLE of MESSAGE FIELD DISPLAY

Figure 4

MANUAL OPERATION

n	CHI	1 V	#
	UQ	10mV	-

T/div 10 ps

DISPLAY of VERTICAL SENSITIVITY PARAMETERS

In the ABRIDGED PANEL STATUS FIELD

Figure 5

C h m 1

10ns> . l v

I I	I	I
\	CHI 52mVDC		CH1>.1 v		=
	n		CHZ	50 mV&	-
			T/div	10 ns

SENSITIVITY DATA DISPLAYED In the ABRIDGED PANEL STATUS FIELD and In the DISPLAYED TRACE FIELD

Figure 6

Fixed Sensitivity	Offset Range
2 V	f 5 times
1 V	f l o t i m e s
0.5 V to 20 mV	f 12 times
10 mV	f 24 times
5 mV	f48 times

Voltage

f 10 V f 1 0 V

f 6 V to f 240 mV f 240 mV

f 240 mV

. A

Main Henu

v

v

UPWARDand DOWNWARD-POINTING, DOUBLE-SHAFT ARROWS INDICATING that INPUT WAVEFORMS are OFF SCREEN

Figure 7

Sampling Modes

	TIME BASE			SAMPLING RATE			DISPLAYED RECORD
				TlMElPOlNT			LENGTH (Polnts)
	TlMElDlV		RIS		SS		RIS	SS
	1	nsec	100	psec	---		100	---
	2	nsec	100	psec	---		200	---
	5	nsec	100	psec	---		500	---
	10	nsec	100	psec	2.5	nsec	1000	40
	20	nsec	100	psec	2.5	nsec	2000	80
	50	nsec	100	psec	2.5	nsec	5000	200
	0.1 psec		100	psec	2.5	nsec	10000	400
	0.2 psec		100	psec	2.5	nsec	20000	800
	0.5 psec		100	psec	2.5	nsec	50000	2000
	1	psec	250	psec	2.5	nsec	40000	4000
	2	psec	500	psec	2.5	nsec	40000	8000
	5	psec	1	nsec	2.5	nsec	50000	20000
	10	psec	---		2.5	nsec	---	40000
	20	psec	---		5	nsec	---	40000
	50	psec	---		10	nsec	---	50000
	0.1 msec		---		25	nsec	---	40000
	0.2 msec		---		50	nsec	---	40000
	0.5 msec		---		0.1	per	---	50000
	1	msec	---		0.25	psec	---	40000
	2	msec	---		0.5	psec	---	40000
	5	msec	---		1	psec	---	50000
	10	msec	---		2.5	psec	---	40000
	20	msec	---		5	psec	---	40000
	50	msec	---		10	psec	---	50000
	0.1 sec		---		25	psec	---	40000
	0.2 sec		---		50	psec	---	40000
			---		ROLL MODE		---
	0.5 sec				0.1	msec		50000
	1	sec	---		0.25	msec	---	40000
			---				---
	2	sec			0.5	msec		40000
	5	sec	---		1	msec	---	50000
	10	sec	---		2.5	msec	---	40000
	20	sec	---		5	msec	---	40000
	50	sec	---		10	msec	---	50000
	100	sec	---		25	msec	---	40000
			---				---	40000
	200	sec			50	msec
			---				---	50000
	500	sec			0.1	sec
	1	ksec	---		0.25	sec	---	40000
	2	ksec	---		0.5	sec	---	40000
	5	ksec	---		1	sec	---	50000