Main Controls: Output 2 - Ametek 7230 Instruction Manual

Chapter 5, WEB CONTROL PANEL OPERATION

5.3.08 Main Controls: Output 2

5-24
The Output 2 controls, shown in figure 5-26, affect the second set of demodulators
Sensitivity
When set to voltage input mode, using the control in the Input section, the
instrument's full-scale voltage sensitivity may be set to any value between 10 nV and
1 V in a 1-2-5 sequence.
When set to current input mode, using the control in the Input section, the
instrument's full-scale current sensitivity may be set to any value between 10 fA and
1 µA (wide bandwidth 10^6 mode), or 10 fA and 10 nA (low-noise 10^8 mode), in a
1-2-5 sequence.
Auto Sen
This function only operates when the reference frequency is above 1 Hz. A single
Auto-Sensitivity operation consists of increasing the full-scale sensitivity range if the
magnitude output is greater than 90% of full-scale, or reducing the range if the
magnitude output is less than 30% of full-scale. After the Auto-Sensitivity function
is called, Auto-Sensitivity operations continue to be made until the required criterion
is met.
In the presence of noise, or a time-varying input signal, it may be a long time before
the Auto-Sensitivity sequence comes to an end, and the resulting setting may not be
necessarily what is really required.
Time Constant
The time constant of the output filters is set using this control. When the Fast control
in the Output Filters section is checked, the range is 10 µs to 100 ks in a 1-2-5
sequence; when it is not checked the minimum time constant is 5 ms.
Slope
The roll-off of the output filters is set, using this control, to values from 6 dB to
24 dB/octave, in 6 dB steps. Note that there are some restrictions in that it is not
possible to select 18 or 24 dB/octave settings at Time Constants of 500 ms or shorter
when using the fast time constant mode.
X Offset and Y Offset
These controls allow manual adjustment of the X2 channel and Y2 channel output
offsets. The offset level set by the controls, which can be any value between -300%
and +300% in 0.01% steps, is added to the X2 channel or Y2 channel output when
the corresponding check boxes are checked.
The values are also set automatically and turned on by the Auto-Offset function,
which is activated by clicking the Auto Offset button.
Figure 5-26, Output 2 Controls