dCS 974 User Manual

Manual for Software Version 1.0x

dCS Ltd

May 2001

To set up the generator, press → twice to move to the menu screen then display the Test menu:

The Generator options are Off, Sine and Square. Press Set slowly to scroll through these. There is a short delay while the generator code is loaded.

IMPORTANT! The initial Generator Amplitude is -18dB0. If the dCS 974 is ultimately driving speakers or headphones, ensure the system gain is at a reasonable level before turning the generator on.

Generator Amplitude Adjustment

Select Generator Amplitude and press Set to adjust it. Turn the rotary control counter-clockwise to reduce the amplitude in 0.5dB steps or clockwise to increase it. Attempting to increase the amplitude above 0dB causes the setting to wrap around to -120dB. When the required amplitude is displayed, press Set again to update the setting.

Generator Frequency Adjustment

Select Generator Frequency and press Set to adjust it. The following screen appears:

The frequency resolution of the generator is about 1 part in 231 of the sample rate – about 10∝Hz at 48 kS/s. Rotating the knob moves the arrows left and right. When the arrows point to the digit that you want to edit, press the Set button. The knob will now increment or decrement the selected digit. If you increment the digit beyond 9, then the next digit gets incremented, and the current digit is set to 0. Similarly if the digit is at 0, decrementing it will change the previous digit(s). For example, the above display shows 1kHz. If we decrement the .0001 digit, the result is as follows:

When you have set the frequency you want, move the arrows to the ` symbol and press Set. To discard the changes and return to the tone generator menu,

move the arrows to the x symbol and press Set.

Manual part no: DOC1241121A1

Page 54

Document No: OS-MA-A0124-112.1A1

Contact dCS on + 44 1799 531 999

email to: more@dcsltd.co.uk

(inside the UK replace + 44 with 0)

web site: www.dcsltd.co.uk