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
3 INPUT STAGE
The input stage amplifies the input signal to a level suitable for demodulator section.
The input signal should be connected to the BNC signal input connector (2).
The input sensitivity is set by using the input sensitivity dial (1). Please note that it is not
possible to rotate the dial directly from the 1V setting to the 3µV setting.
The input stage of the unit can operate in a number of ways. By default, the unit is factory set
so the input stage acts as a single ended, DC coupled input as this is the lowest noise method of
operation. It is also possible to operate the input stage in AC coupled mode, differential mode
and current mode. To operate the lock-in in these different modes requires jumpers within the
unit to be modified. This can be achieved as follows:
3.1 Accessing Input Stage Jumpers
The input stage includes jumpers which enable the mode of operation of the input stage to be
modified. To access the jumpers:
(1) Switch off and disconnect power before opening unit.
(2) Remove the 10 screws holding the lid on then remove lid. Do not disconnect earth strap.
(3) Change the jumper settings as per the diagrams in the following sections. Do not operate
the unit with the lid removed due to the power voltages accessible within the unit.
(4) Replace lid and the 10 screws.
To Next Page
Loading...