Control Selection Menu - Ametek 7280 Instruction Manual

Chapter 5, FRONT PANEL OPERATION
Controls
AC GAIN
The AC Gain control is always displayed in the top left-hand corner of the
Main Display. If the automatic AC Gain control is turned off (using the Signal
Channel menu - see section 5.3.04), then this control allows the AC Gain to be
adjusted from 0 dB to 66 dB in 6 or 8 dB steps, although not all settings are available
at all full-scale sensitivity settings. If the automatic control is turned on, then the
control cannot be adjusted, but the present value of AC Gain is still displayed. In
either mode, changing the full-scale sensitivity may result in a change to the AC
Gain.
To obtain the best accuracy, use the highest value of AC Gain that is possible without
causing signal input overload, indicated by the words Input Overload in the top left-
hand corner of the screen flashing on and off. The Input Limit value, displayed
immediately under the AC Gain control, is the largest value of rms signal that may be
applied without causing signal overload.

5.3.02 Control Selection Menu

The four user-selectable controls on the Main Display may be chosen from those
available by pressing the Set Control key. The Control Selection menu appears, as
shown in figure 5-3.
Figure 5-3, Control Selection Setup Menu
Press the keys adjacent to each of the four control descriptions on the left-
hand side until the required controls are selected. Note that it is not possible to
display the same control in more than one position simultaneously.
The available controls have the following functions:-
SENSITIVITY
When set to voltage input mode, using the Signal Channel menu, 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 Signal Channel menu, the instrument's
5-5