Anfatec eLockIn 203, Manual

Page: 26 / 58

AUX Out Value
[ LockIn / Out / Value]
For the channels 5 to 8, a value given in V can be set here. In the remote control
regime, this function can be used to control external parameters of a set-up and thus to
program more enhanced measurement procedures.
3.3 T
HE
S
PECTRA
M
ENU
[S
PECTRA
]
While the LockIn mode displays values as numbers, the Spectra mode allows to collect
such information in dependence on the frequency. The data are shown as graphs and
can be saved as ASCII files for later analysis.
Note: The channels in spectra mode are the same as selected in the LockIn
mode. The channel selection is only possible in LockIn mode (see section
3.1.3 on page 16).
In addition to the channels available in
LockIn
mode, the
Spectra
mode provides a
reference channels
Ref
, which is used to store spectra temporarily.
Example: In order to measure a frequency spectrum of the
amplitude R of an oscillating cantilever, take care that the
following settings are correct:
R is selected as source for channel 1 (3.2.3: Channel),
channel 1 is really displayed in a visible color (see 3.3.2:
Color), and
the display of the other three channels is disabled (see
3.3.2: Color) to avoid confusion in the shown curves.
3.3.1
R
UN
/S
TOP
[ S
PECTRA
/ R
UN
]
OR
[ S
PECTRA
/ S
TOP
]
The first menu item in the menu toggles the state of the instrument in
Spectra
mode.
To
Start
the spectrum acquisition, press button
1
(see Figure 6) when the node
displays
Run
. To
Stop
the acquisition process, press
Stop
.
In order to acquire spectra in logarithmic steps, the Type of the frequency axis freq has
to be set to Log .
3.3.2 D
ISPLAY
[ S
PECTRA
/ D
ISPLAY
]
In Spectra mode, the lines are superimposed on each other. The scaling on the screen
is always automatically, which means they are scaled to fit the screen area
independently on each other. The user can switch channels off (see 3.3.2: Color),
control the color of each line and whether they are displayed linearly or logarithmic (see
3.3.2: Type). The line can be shifted by changing a parameter called offset (see 3.3.2:
Offset).
Axis
[ Spectra / Display / Axis ]
This menu item gives access to the display parameters of all the selected channels (see
3.2.3). Besides that, the parameters of one reference channel whose data are saved on
the memory and the frequency axis
freq
are available. When an axis is selected, its
display parameters are shown in the lower nodes (
Type
,
Color
, and
Offset
).
Type
[ Spectra / Display / Type ]
This menu item shows either the text
Lin
(linearly scaled) or
Log
(logarithmic scaled). If
the selected axis is
freq
(frequency), this parameter equals also the sweeping type of
the frequency.
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