Ametek 7280 Instruction Manual page 55

Figure 5-6, Signal Channel Menu - Current Input Mode
The Signal Channel menu has five controls affecting the instrument's signal input
channel. Changes to the setting of these controls can be made by using the adjacent
keys, with the currently active selection being shown in reversed text.
INPUT COUPLING
The input coupling can be set as follows:-
GND
The shells of the A and B/I connectors are connected directly to chassis ground.
FLT
The shells of the A and B/I connectors are connected to chassis ground via a
1 kΩ resistor.
FAST
The input coupling mode is set for fast recovery from input overload conditions.
Significant phase and magnitude errors will occur at frequencies below 20 Hz.
SLOW
The input coupling mode is set for slow recovery from input overload conditions,
but there will be smaller phase and magnitude errors at frequencies below 20 Hz
than when using the Fast mode.
INPUT MODE
This control sets the preamplifier input configuration to either voltage or current
mode, and also changes the function of the INPUT CONNECTOR control.
INPUT CONNECTOR
In voltage input mode, as shown in figure 5-5, this control has four settings:-
A
The signal channel input is a single-ended voltage input to the BNC connector on
the front panel marked A.
Chapter 5, FRONT PANEL OPERATION
5-9