Aim-TTI TG1000, Instruction Manual

Page: 14 / 44

13
Standard Waveform Operation
When first switched on, and at all subsequent power-ups, unless specified otherwise on the
UTILITY menu, the generator will be set to the factory defaults (Appendix 2), with the MAIN OUT
off. The basic parameters can be changed as described below.
Setting Generator Parameters
Main Menu
The starting point for changing any parameter is the Main Menu, accessed by pressing the
MENU key.
◊
WAVEFORM SYMMETRY
◊
◊
FREQUENCY MODE
◊
◊
AMPLITUDE UTILITY
◊
◊
DC OFFSET AUX OUT
◊
The set-up screen for each of the principal parameters is displayed by pressing the appropriate
soft-key on this Main Menu; the parameters can then be changed as described below.
Waveform Selection
WAVEFORM
♦
sine +pulse
◊
◊
square - pulse
◊
◊
triangle dc only
◊
Pressing the WAVE soft-key on the main menu gives the WAVEFORM screen which lists all the
waveforms available. The currently selected waveform (sine with the factory defaults setting) is
indicated by the filled diamond; the selection is changed by pressing the soft
−
key beside the
required waveform.
Sine square and triangle are bipolar waveforms centred about the baseline level set from the DC
Offset screen; +pulse and –pulse are uni-polar waveforms that are respectively positive and
negative with respect to the baseline. When
dc only
is selected the output ‘waveform’ is the
baseline DC voltage only, set from the DC Offset screen.
Frequency
FREQUENCY
10·0000 kHz
♦
freq period
◊
Pressing the FREQ key gives the
FREQUENCY
screen. With
freq
selected as shown above,
the frequency can be entered directly from the keyboard in any convenient units, e.g. 12.34kHz
can be entered directly in kHz but can also be entered as 12340Hz or 0.01234MHz.
With
period
selected instead of
freq
the frequency can be set in terms of a period; the
period can be entered directly in any convenient units, e.g. 0.1ms can also be entered as
0.0001s or 100us. The hardware is actually programmed in terms of frequency and when a
period entry is made the synthesised frequency is the nearest equivalent value that the frequency
resolution and conversion calculation gives. Since the instrument’s frequency resolution is 1mHz
there will generally be no noticeable loss of precision for frequencies above 1kHz (periods <1ms)
but the conversion errors will increase progressively for entries of longer periods; to maintain
precision, low frequencies (<1kHz) should be entered in terms of frequency.
Turning the rotary control will increment or decrement the numeric value in steps determined by
the position of the edit cursor (flashing underline); the cursor is moved with the left and right
arrowed cursor keys.
Note that the upper frequency limits vary for the different waveform types; refer to the
Specifications section for details.