Agilent Technologies E1420B, User Manual

Page: 222 / 476

222 Agilent E5505A User’s Guide
7
Residual Measurement Fundamentals
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.
2
Measure the power level that will be applied to the Signal Input port of the
test set’s phase detector.
Table 35 on page 223 shows the acceptable
amplitude ranges for the E5505A system phase detectors.
NO T E
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