Control Selection Menu - Ametek 7124 Instruction Manual

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.
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
full-scale current sensitivity may be set to any value between 1 pA and 100 µA (wide
bandwidth mode, or 10 fA and 10 nA (low-noise mode), in a 1-2-5 sequence.
The number reported after the letters DR is the instrument's Dynamic Reserve,
expressed in decibels, as calculated by the following equation:-
 
DR 20 log
Chapter 5, FRONT PANEL OPERATION
Figure 5-3, Control Selection Setup Menu
 
2

 
ACGain (in dB)
10
 
SEN
5-5