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
CONTENTS
1 POWER SUPPLY
1.1 WARNING
1.2 Power Supply
1.3 To Change The Voltage Selection Switch
1.4 Earth
1.5 Fuse
2 OPERATION
3 INPUT STAGE
3.1 Accessing Input Stage Jumpers
3.2 Jumper Settings Overview
3.3 Single Ended DC Coupled Input (Default Setting)
3.4 Single Ended AC Coupled Input
3.5 Single Ended Current Input
3.6 Differential Input
3.7 Low Impedance Differential Input
4 SIGNAL GROUND, CASE GROUND AND EARTH
4.1 Accessing Input Stage Jumpers
4.2 Signal Ground Connected to Case and Electrical Earth (Default Setting)
4.3 Signal Ground Connected to Case and Electrical Earth Via 100Ω Resistor
4.4 Signal Ground Isolated From Case and Electrical Earth
5 REFERENCE SECTION
5.1 1F/2F Reference Select Switch
5.2 Coarse Phase Control
5.3 Fine Phase Control
6 DEMODULATOR / OUTPUT SECTION
7 USING THE 420 AS A SINGLE PHASE INSTRUMENT TO TAKE
QUICK MEASUREMENTS
8 USING THE 420 AS A SINGLE PHASE INSTRUMENT TO TAKE
ACCURATE MEASUREMENTS
9 USING THE 420 AS A DUAL PHASE INSTRUMENT TO TAKE
ACCURATE MEASUREMENTS
10 HOW TO MAKE AMPLITUDE AND PHASE MEASUREMENTS
USING AN OSCILLOSCOPE
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