Ametek 7124 Instruction Manual page 63

GROUND
The shells of the A and B/I connectors at the 7124 RCU are connected directly
to chassis ground.
FLOAT
The shells of the A and B/I connectors at the 7124 RCU are connected to chassis
ground via a 1 k resistor.
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 7124 RCU front panel marked A.
–B
The signal channel input is an inverting single-ended voltage input to the BNC
connector on the 7124 RCU front panel marked B/I.
A-B
In this setting the signal channel input is a differential voltage input connected to
the BNC connectors on the 7124 RCU front panel marked A and B/I.
AUX
In this setting the signal channel input is a single-ended voltage input connected
to the BNC connectors on the 7124 main console front panel marked AUX.
OFF
The input is disconnected in this setting.
In current input mode, shown in figure 5-6, this control has two settings:-
WIDE-B/W (Wide Bandwidth Converter)
In this setting the signal channel input is a single-ended current input connected
to the BNC connector on the 7124 RCU front panel marked B/I, and uses the
wide bandwidth current-to-voltage converter.
LO-NOISE (Low Noise Converter)
In this setting the signal channel input is a single-ended current input connected
to the BNC connector on the 7124 RCU front panel marked B/I, and uses the
low-noise current-to-voltage converter.
Signal Channel Menu 2
Pressing a key adjacent to the Signal Channel Menu 2 item accesses the Signal
Channel Menu 2, which is shown in figure 5-7.
Chapter 5, FRONT PANEL OPERATION
5-9