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Gould 400 Oszilloskop
Modell: 400
Datum: 1989
Kategorie: Messgeräte
Gruppe: Oszilloskop
Beschreibung: Digital Storage Oscilloscope

This service manual is written primarily for the service
engineer who is performing a standard recalibration or
who is undertaking repairs when the instrument has
developed a fault. The system overview will help the
engineer to understand the inner workings of the 400
Digital storage oscilloscope (DSO).

The fault finding procedure given in this manual takes
a systematic approach. Starting with the symptoms,
the engineer is led to the area or areas at fault by a
series of questions in the form of several flowcharts.
These require no knowledge of the system, although a
basic knowledge of electronics is essential. Throughout
this manual a reasonable level of understanding is
assumed. A list of abbreviations and mnemonics used
is shown in section 9.
Many of the complex operational features of the 400
DSO are performed at chip level. The system includes
one large semi-custom gate array which generates the
ten phase system and related timings and handles the
acquisition of data. On the analogue side there are
three semi-custom analogue I.C.'s, two of which are
channel preamplifiers providing virtually all the
input signal processing, the third is the trigger
signal processing circuit. When fault finding, they
can be treated as 'Black Boxes' so alleviating some
of the more difficult servicing tasks.

Should a problem arise whilst servicing the instrument
expert help and advice is available from Gould (see
section 10 for details).

Folgende Anleitungen sind für obiges Gerät verfügbar:

Gould -- 400 -- Serviceanleitung
Dateiname: Gould-4209-Manual-Page-1-Picture
Dokumenttyp: Serviceanleitung
Seitenanzahl: 89
Dateigröße: 8.91 Mbytes (9339009 Bytes)
Sprache: Englisch
Dokument-ID/Nummer: 430120
Datum: 1989
Qualität: Gescanntes Dokument, teilweise schwer oder teilweise nicht zu lesen.
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Introduction		5
1.	Safety and Power Requirements	6
	1.1 International Safety Warning	5
	1.2 Grounding	6
	1.3 Live Parts	6
	1.4 Ventilation and Dust	6
	1.5 Operating Temperatures	6
	1.6 Power and Frequency Requirements	6
	1.7 Fuse Requirements	6
2.	Specification	7
3.	System Overview	10
	3.1 From the BNC to the Screen	10
	3.2 Microprocessor Control	10
	3.3 Triggering	10
	3.4 Timebase Generation	11
	3.5 CCD	11
4.	Calibration and Test	18
	4.1 Calibration Schedule	18
	4.2 The Test Menus	20
	4.3 Noise Debug	20
	4.4 CH1 Calibration Status	20
	4.5 Test Cal Hardware	20
	4.6 ETS Setup	20
	4.7 ETS Debug Mode	21
	4.8 Initialise Cal Stores	21
	4.9 RS423 Test Interface	21
5.	Servicing	22
	5.1 How to use this section	22
	5.2 Symptom tables	22
	5.3 Fault finding flowcharts	24
	5.4 Circuit descriptions	35
6.	Circuit diagrams, parts lists and	
	component location	47
7.	Mechanical components and exploded views 79	
8.	Summary of in-circuit measurements	83
9.	Definition of Mnemonics	85
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