User`s guide

Residual Measurement Fundamentals 7
Agilent E5505A User’s Guide 225
Advantages
Calibration is done under actual measurement conditions so all non-linearities
and harmonics of the phase detector are calibrated out.
Broadband couplers with good directivity are available, at reasonable cost, to
couple in the calibration spur.
Disadvantages
Requires a second RF sources that can be set between 10 Hz and up to 50 MHz
(depending on the baseband analyzer used) from the carrier source frequency.
Requires an RF spectrum analyzer for manual measurement of the
signal-to-spur ratio and the spur offset frequency.
Procedure
1 Connect circuit as per Figure 159, and tighten all connections. Note that the
input signal into the directional coupler is being supplied to the coupler’s
output port.
NOTE
The Single-sided Spur Method and the Double-sided Spur Method (Option 4) are the two
most accurate methods.
Figure 159 Calibration setup for single-sided spur
Power
splitter Phase
detector
Source
Calibration
source
-10 dB
attenuator
E5505a_cal_setup_single_sided
01 Mar 04 rev 1
Optional line
stretcher
-20 dB
coupler
Test set
Signal
input
Ref input
100 kHz
-40 dBc
RF spectrum
analyzer
}
output
Coupler
port
input