Press this soft key to set the start frequency in units of Hz, kHz, MHz, or GHz. If you enter a start frequency that is higher than the currently‑set stop frequency, and if CAL = On, then the start frequency is set to the same value as the stop frequency. If you enter a start frequency that is higher than the currently‑set stop frequency, and if CAL = Off, then both start and stop frequency are set to the new frequency.

Press this soft key to set the stop frequency in units of Hz, kHz, MHz, or GHz. If you enter a stop frequency that is lower than the currently‑set start frequency, and if CAL = On, then the stop frequency is set to the same value as the start frequency. If you enter a stop frequency that is lower than the currently‑set start frequency, and if CAL = Off, then both stop and start frequency are set to the new frequency.

Press this soft key to set the center frequency in units of Hz, kHz, MHz, or GHz. The center frequency can be set with the arrow keys, the rotary knob, or the number keypad. When using the number keypad, the menu displays soft keys with Hz, kHz, MHz, and GHz units. Pressing the Enter key has the same effect as pressing the MHz soft key.

Press this soft key to set the span in units of Hz, kHz, MHz, or GHz. The span setting determines the frequency range over which the instrument sweeps. The span may be set from 0 (zero) to the maximum frequency of the instrument.

Press this soft key to set the start distance in units of meters or feet. If you enter a start distance that is higher than the currently‑set stop distance, and if CAL = On, then the start distance is set to the same value as the stop distance. If you enter a start distance that is higher than the currently‑set stop distance, and if CAL = Off, then both start and stop distance are set to the new distance.

Press this soft key to set the stop distance in units of meters or feet. If you enter a stop distance that is lower than the currently‑set start distance, and if CAL = On, then the stop distance is set to the same value as the start distance. If you enter a stop distance that is lower than the currently‑set start distance, and if CAL = Off, then both stop and start distance are set to the new distance.

Press this soft key to open the Distance Info dialog box. The upper portion of the dialog box displays cable information, such as cable loss and propagation velocity. the lower portion of the dialog box displays parameter information. You can use the rotary knob or the arrow keys to scroll through the list, which may have additional information beyond the lower edge of the dialog box. For more information about this dialog box, refer to the images in Section Distance Info List Box for Cable and Section Distance Info List Box for Waveguide and also to the descriptions in Time and Distance Information and Distance Information.

Press this soft key to set the start frequency in units of Hz, kHz, MHz, or GHz. If you enter a start frequency that is higher than the currently‑set stop frequency, and if CAL = On, then the start frequency is set to the same value as the stop frequency. If you enter a start frequency that is higher than the currently‑set stop frequency, and if CAL = Off, then both start and stop frequency are set to the new frequency.

Press this soft key to set the stop frequency in units of Hz, kHz, MHz, or GHz. If you enter a stop frequency that is lower than the currently‑set start frequency, and if CAL = On, then the stop frequency is set to the same value as the start frequency. If you enter a stop frequency that is lower than the currently‑set start frequency, and if CAL = Off, then both stop and start frequency are set to the new frequency.

Press this soft key to set the center frequency in units of Hz, kHz, MHz, or GHz. The center frequency can be set with the arrow keys, the rotary knob, or the number keypad. When using the number keypad, the menu displays soft keys with Hz, kHz, MHz, and GHz units. Pressing the Enter key has the same effect as pressing the MHz soft key.

Press this soft key to open the DTF Setup Menu.