Frequency Control; Voltage Derating For Low Frequencies - Ametek L Series User Manual

6.4 Frequency control

The frequency can be changed by moving the slider control at the top of
the screen left or right. The minimum and maximum frequency limits are
determined by the hardware settings of the L-Series unit connected. The
frequency value can also be typed in from the keyboard when the cursor is in
the frequency edit box.
The
frequenc
y value
slider control can be used to change the frequency in three different ways :
1. Continuous changes : Dragging the slider handle. This is the fastest way
to effect large and quick changes in value. It is not as accurate as the
final value that occurs when the mouse button is released may not be the
exact value desired.
2. Large step changes :
This will cause the value to change in intermediate size steps. It provides
a balance between adjustment speed and accuracy.
3. Small step changes :
provides the most precise control but it can be slow when the value needs
to be changed to a much higher or lower value. This method is best used
to make final adjustments.

6.4.1 Voltage derating for low frequencies

While the minimum frequency limit for most L-Series power sources is 45
Hz, frequencies down to 17 Hz can be selected with output voltage derating.
When the frequency is set below 45 Hz, the voltage control will automatically
be adjusted to reflect this derating. The reverse is not true however. When a
frequency below 45 Hz is selected and the voltage control is increased
beyond the derated level, a syntax error will be reported. In Immediate mode,
this syntax error will appear about 1 sec after the incorrect setting has been
set. In Update mode, it will appear after the
Rev D – March 2011
L-Series and FCS-18 Graphical User Interface User Manual
Clicking to the left or right of the slider handle.
Clicking on the left or right arrow. This method
California Instruments
button is pressed.
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