HP 8642A Operation And Calibration Manual page 89

Model 864 2A/B
Operation
RF Frequency Sweep (cont'd)
How to Set Sweep Time for Stepped Frequency Sweep
(Using Sweep Time to Set Frequency Step Size and Number of Steps)
The opera tmg characteristics for sweep time are as follows:
Minimum Sweep Time
Maximum Sweep Time
Sweep TimE Resolution
Minimum Frequency Sweep Step Size
Minimum Frequency Dwell Time Per Point:
Settling Status
Special Function 119
(Disable Settling)
Special Function 219
(Re·enable Settling)
Stepped Frequency Sweep Calculations
8642A
60 ms
110 ms
275 ms
999s
1
ms
1 Hz
86428
80 ms
135 ms
Since the sweep step size is not directly selectable, the following calcula tions provide
ways to determine:
1) the number of steps automatically selected (page 3-53)
2)
the frequency step size automatically selected (page 3-54)
3)
the required sweep time that will select a desired number of frequency steps (page
3-54), and
4) the required sweep time that will select a desired step size (page 3-57).
However, these calculations do not directly apply to situations when the start end-point
is equal to the stop end-point (zero span). Refer to "Zero Span for Stepped Frequency
Sweep" on page 3-64 for information about X-axis steps in zero span.
The minimum frequency dwell time per point is different depending on whether you
have an 8642A or 8642B and whether you have selected Special Function 119. So,
whenever you see the term "Min. Dwell Time" in a calculation, use the table above that
lists the Minimum Frequency Dwell Tlme Per Point to determine the value of that term.
Also, frequency points are truncated to I Hz. Span is always an integer since end-points
are integers.
1) Calculate the number of steps automatically selected.
The number of steps is the minimum of:
1023
or
I
Stan Freljuency (in Hz) - Stop Frequency (in Hz)
I
or
[
INTEGER
OF (
Sweep Time
(in ms) ) _ ]
Min. Dwell Time
(in ms) 1
3-53