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Scitec 420 - User Manual

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Boston Electronics Corporation, 91 Boylston Street, Brookline MA 02445
(800)347-5445 or (617)566-3821 * fax (617)731-0935 * boselec@boselec.com * www.boselec.com
Bartles Industrial Estate, North Street, Redruth, Cornwall TR15 1HR
Tel. (01209) 314608 E-mail: scitec@scitec.uk.com
Fax. (01209) 314609 Web: http://www.scitec.uk.com
MODEL 420 ANALOG DUAL PHASE
LOCK-IN AMPLIFIER
USER MANUAL
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Summary

Power Supply

WARNING

Safety instructions regarding power voltage selection and unit operation with lid removed.

Power Supply Options

Details the available input voltage options (115V AC and 220V AC) for the unit.

Changing Voltage Selection Switch

Step-by-step guide to safely change the internal voltage selection switch.

Electrical Earth Connection

Importance of grounding the instrument via the power inlet cable for safety.

Fuse Specification and Location

Information on the fuse type (1 Amp anti-surge) and its location in the power connector.

Input Stage

Accessing Input Stage Jumpers

Instructions on how to safely access and modify jumpers within the input stage.

Jumper Settings Overview

Illustrates the input stage circuit and jumper positions for different configurations.

Single Ended DC Coupled Input

Default mode providing best noise performance, with details on DC offset tolerance.

Single Ended AC Coupled Input

Mode for applications with large DC offsets, using an RC network.

Single Ended Current Input

Configuration for current input using a 6.8MΩ resistor, with performance notes.

Differential Input Configuration

How to convert single-ended modes to differential input for breaking ground loops.

Low Impedance Differential Input

Configuration for differential input with a 100Ω resistor to prevent floating grounds.

Signal Ground, Case Ground and Earth

Accessing Earth Jumpers

Procedure to access jumpers that control signal ground connection to case and earth.

Signal Ground Connected to Case and Electrical Earth (Default Setting)

Default configuration for best noise performance, connecting signal ground directly to earth.

Signal Ground Connected to Case and Electrical Earth Via 100Ω Resistor

Configuration useful for mitigating earth loop problems by using a 100Ω resistor.

Signal Ground Isolated From Case and Electrical Earth

Configuration to isolate signal ground from case/earth, with voltage limit advisory.

Reference Section

1 F;2 F Reference Select Switch

Selects recovery frequency (1F or 2F) relative to the reference signal.

Coarse Phase Control

Allows phase shifting of the reference signal in 90° multiples.

Fine Phase Control

Allows phase shifting of the reference signal across a 0° to 100° range.

Scitec 420 Specifications

General IconGeneral
BrandScitec
Model420
CategoryAmplifier
LanguageEnglish