Main Controls: Output 1 - Ametek 7230 Instruction Manual

5.3.06 Main Controls: Output 1

The Output 1 controls, shown in figure 5-24, affect the first 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.
The Dynamic Reserve figure, expressed in decibels, as calculated by the following
equation and shown on the display in the Status block:-
 
DR 20 log
Example:-
If AC Gain = 12 dB and SEN = 2 mV then
 
DR 20 log
DR = 48 dB
Auto Sen
This button 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.
Chapter 5, WEB CONTROL PANEL OPERATION
Figure 5-24, Output 1 Controls
 
2

 
ACGain (in dB)
10
 
SEN
 
2

 
12
10
 
0.002
5-21