Section 4 Unit Operation
4-36
4.3.16 High-Speed Sampling Function
This function is effective only when the unit is controlled through the GPIB.
This features repeats to measure the signal for each time interval (T) and stores the results without discontinuing measure-
ment.
It allows you to get stored data through GPIB, making it possible to measure frequency variation in a short time as well as
VCO startup characteristics. If you will use Input1 to input a signal, set the manual frequency value and manual amplitude
discrimination value in advance Fig. 4-40 shows parameter-related information.
m1 m2 mN
TT T
T
1 T2 TN
Setting time interval
Measurement signal period
Standard counter count
First measurement Second
measurement
· · · · Nth measurement
Fig. 4-40 High-Speed Sampling Function
The various frequencies (Fi) during the short measuring time (Ti) are calculated as follows :
Fi=(mi/Ti)×10
9
(Hz) i=1, 2, · · · , N
To multiply the frequency resolution K times, the following combination is used.
Fi = (∑ mi+p/∑ Ti+p)×10
9
(Hz)
k–1 k–1
p=0 p=0
i=1, 2, · · · , N–k+1
When Input2 is used for the input terminal for the signal to be measured, you can find the frequency using the above
formulas. When using Input1, add the offset frequency value F0 to the frequency value Fi that you calculated. See the
Section 5 “GPIB” regarding the setting of parameters and the offset frequency value F0.
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