Anfatec eLockIn 203, Manual

Page: 5 / 58

1 INTRODUCTION
1.1 G
ENERAL
F
UNCTIONS
The eLockIn203 is a versatile scientific instrument that supports the following functions:
LockIn Amplifier
Digital Oscilloscope
Spectrum Analyzer
Data Acquisition
The instrument works as a stand-alone device with a 5.6 inches TFT display. Its internal
functionality is best described with the following overall schematics:
The two input signals A and B can be used in three different input modes:
Mode A : the input A is given to both AD-converters simultaneously.
Mode A-B : after a first amplification, the difference between A and B is formed
electronically. The resulting signal A-B is given to both AD-converters
simultaneously.
Mode
A & B : the two inputs are amplified separately with the same amplification
factor and feed independently into the two AD-converters.
Note: When the H a r m onic is set to
1
and the input c o n f i g uration
A-B
or
A
is chosen, the signals
Xn, Yn, Rn
and
Phin
are displayed as
X, Y, R
, and
Phi
and equal the results provided as
X1, Y1, R1
and
Phi1
.
The different stages of input amplification and switching between the three input modes
5 (58)
Figure 1: Schematic diagram with the basic components of the lock-in amplifier (see page
52).