Virtual Reference Configuration Menu; Menu Descriptions - Dual Reference Mode; Dual Reference Setup Menu - Ametek 7124 Instruction Manual

Precision lock-in amplifier

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5.4.03 Virtual Reference Configuration Menu

Figure 5-47, Configuration Menu - Virtual Reference Mode

In virtual reference mode, the choices available on the Configuration menu are as

shown in figure 5-47. To leave virtual reference mode and return to single reference

mode press the Exit Virtual Reference key. The remaining controls, including the

sub-menus, operate as already described in section 5.3.15

This completes the description of the virtual reference mode menus.

The dual reference mode allows the model 7124 to simultaneously measure signals

applied to the signal input at two different reference frequencies. The source of these

reference signals is two from the five available options of Internal, External Front

Panel (main console), External Rear Panel (main console), External Front Panel

(RCU), and External Rear Panel (RCU). Hardware limitations mean that if using two

external reference frequencies, one of them is limited to a maximum of 3.0 kHz, and

only one of them can be connected via the RCU (i.e. it is not possible to use both the

reference connectors on the RCU at the same time).

During dual reference mode operation, some of the control and display menus differ

from those used for single reference mode, so these are described in the following

sections. The remaining menus operate in the same way as in single reference mode,

as already described in section 5.3.

When the Configuration menu is displayed, pressing the Dual Reference key

activates the dual reference mode. While the instrument switches to this mode, the

Dual Reference Setup menu is displayed, as shown in figure 5-48.

Chapter 5, FRONT PANEL OPERATION

5-61

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