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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
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
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 2
31
of the sample
rate – about 10µHz 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.