6-5
6.2 Frequency Measurement
When the count mode is NORMAL, measurement error is the same as the direct count method, and when it is FAST, it is
the same as the reciprocal method. In addition, error due to harmonic mixing is not ignored on Input1. This error is called
residual error. The following shows whether to operate the source of the signal to measure this unit at the same standard
signal and the accuracy when the unit uses a highly stable external reference signal :
(Count mode = Normal)
Measurement accuracy = ±1 count ± time base accuracy × measurement frequency ± residual error 1
(Count mode = FAST)
Measurement accuracy = ±1 count ±
time base
accuracy ×
measurement frequency
± trigger error ± residual error 2
Note the following :
Residual error 1 = measurement frequency (GHz) /10 count (rms)
Residual error 2 = measurement frequency (GHz) /2 count (rms)
To Next Page
Loading...