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Performance Test
R&S
ZVB
1145.1078.82 1.4
E-1
Checking the Harmonics
Instrument:
Spectrum analyzer (see Chapter "Test Equipment", Item1)
Test cable (see Chapter “Test Equipment", Item7)
Test setup:
Connect the spectrum analyzer to port1 (port 2 to port 4)
Spectrum analyzer settings:
Note:
Synchronize the reference oscillators in the spectrum analyzer and in the
R&S
®
ZVB.
- [
PRESET
]
- [
FREQ
: f
GEN
, 2* f
GEN
, 3* f
GEN
*]
- [
SPAN
: ZERO SPAN ]
- [
BW
: MANUAL RES BW :
100 Hz
]
- [
MARKER
: DETECTOR : RMS ]
- [
AMPT
: REF LEVEL :
10 dBm
]
* For measurement frequencies, see Performance Test Report {fGEN}.
R&S
®
ZVB settings:
- [
Preset
]
- [
Meas
: Wave Quantities: a1 Src Port 1
(a2 Src Port 2, a3 Src Port 3, a4 Src Port 4)]
- [
Sweep
: Sweep Type : CW Mode :
CW Frequency :
{f
GEN
*}
;
Power :
8 dBm
]
- [
Sweep
: Single :
Restart
]
* For measurement frequencies, see Performance Test Report {fGEN}.
Measurement:
Read off the levels L
n*fgen
(n = 1, 2, 3)
indicated by the spectrum
analyzer’s markers.
Calculation:
Harmonics
=
L
n*
f gen
- L
fgen
- cable loss
(in
dB)
The cable loss corresponds to the S
21
of the test cable used between the
fundamental and the measured harmonic (S
21
is negative).
Содержание ZVB 4
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