Chapter 4. Configuring the response mode

The CMG-6TC is available in two versions. Each version has a set of four different frequency response modes, from which the operator can choose. The four response modes are referred to as SP (short period), SMP (short-medium period), LMP (long-medium period) and LP (long period).

* Versions with 50Hz low-pass corners are also available.

The response mode can be changed at any time using either of the following methods:

• Using the serial console menu (see section 5.2).

• By connecting specific pins on the connector to digital ground (see section 4.2).

In order to use the first method (serial console menu), connector pins S and T should be left open circuit (not connected).

In order to use the second method (connector pins), the serial console menu should first be used to set the response mode to “LP” (option 0).

4.1 Setting the response mode using the serial console

To configure the 6TC response mode using the serial console menu, follow the instructions given in section 5. Note that pins S and T on the connector should be left open circuit when relying on the menu to set the response mode.

4.2 Setting the response mode using the connector pins

In order to set the response mode using the connector pins, the serial menu should first be used to set the response mode to “LP” (option 0). If any other mode is selected via the serial menu, only that mode and “SP” mode can be enabled using the connector pins.

• Identify pins S, T and Y on the instrument connector.

• Connect pin S and/or pin T to pin Y (digital ground) as required, according to the following table: