Ametek 7280 Instruction Manual page 89

Chapter 5, FRONT PANEL OPERATION
Figure 5-27, Curve Buffer Menu
The curve buffer menu has three controls affecting the instrument's internal 32768
point curve buffer, two status indicators and keys to access the Curve Select sub-
menu and menus associated with the oscillator..
TIME PER POINT
This control defines the interval between each data point in the curve buffer. It may
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be set to any value between 1 ms and 1 × 10 s in 1 ms increments.
If using the curve buffer to take data at the same time as an Oscillator Frequency or
Amplitude sweep by setting the LINK TO CURVE BUFFER control on the relevant
menu to YES (sections 5.3.10 and 5.3.11), then the user should note the following
limitation: If the OPERATING MODE control on the Analog Outputs Menu (section
5.3.18) is also set to FAST then the minimum time per point for the oscillator sweep
will be 140 ms. Hence, although it remains possible to set the TIME PER POINT
control to settings shorter than 140 ms in this case, the effect will be that the
instrument takes several data points at each oscillator setting. For example, if the
TIME PER POINT control were set to 14 ms but the TIME/STEP oscillator sweep
control were 140 ms then ten data points would be taken into the buffer at each
oscillator setting.
CURVE LENGTH
This control defines the number of points to be stored in the internal curve buffer
when either single or repetitive sweeps are executed. The buffer can hold a maximum
of 32768 points, shared equally between the curve types as defined by the Curve
Select menu. Hence, for example, if 16 curve types are to be stored then the
maximum curve length for each curve is 2048 points.
Note that if the number of curves to be stored is increased beyond that which may be
stored at the current curve length, then the curve length is reduced automatically.
POINTS STORED
This shows the number of points stored in the curve buffer. The number is
incremented at the rate defined by the Time per Point control. On completion of a
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