Anritsu 680 C Series, Maintenance Manual

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3-10
SINGLE SIDEBAND
PHASE NOISE TEST The following test can be used to verify that the 690XXB/691XXB
meets its single sideband phase noise specifications. For this test, a
second 69XXXB is required. This additional instrument acts as a local
oscillator (LO). The CW RF output of the 690XXB/691XXB under test
(DUT) is mixed with the CW RF output from the 69XXXB LO which is
offset by 100 MHz. Single sideband phase noise is measured at offsets
of 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, and 1 MHz away from the
resultant 100 MHz IF.
Test Setup Connect the equipment, shown in Figure 3-5, as fol-
lows:
1. Connect a GPIB interface cable from the PN9000
to the 69XXXB (LO) rear panel IEEE 488 GPIB
connector.
2. Connect a GPIB interface cable from the PN9000
to the 690XXB/691XXB (DUT) rear panel IEEE
488 GPIB connector.
3. Connect the 69XXXB (LO) RF OUTPUT to the LO
INPUT of the PN9000 Phase Detector module.
4. Connect the 690XXB/691XXB (DUT) RF OUTPUT
to the RF INPUT of the PN9000 Phase Detector
module.
3-20 690XXB/691XXB MM
6 9 X X X B ( L O )
6 9 0 X X B / 6 9 1 X X B ( D U T )
P N 9 0 0 0
P h a s e N o i s e
M e a s u r e m e n t S y s t e m
R E M .
P N 9 0 0 0
P H A S E N O I S E
M E A S U R E M E N T
S Y S T E M
E R R .
M E A S .
B A T T .
S T D B Y
L I N E
O N
S T A T U S
P N 9 0 6 0 - 0 0
D C - 1 0 M H z
N O I S E
O U T P U T
P N 9 4 7 0 - 0 0
N O I S E D E M O D
O U T P U T
L O C K
C O N T R O L
P N 9 4 5 0 - 0 0
T U N E V O L T A G E
O U T P U T
P H A S E
F
+ P / 8
- P / 8
0
+ 1 0 V p 6 0 0 W -
+ 2 0 V p 6 0 0 W
-
P N 9 3 4 2 - 0 1
5 M H z - 2 6 . 5 G H z
O C X O
C R Y S T A L
O S C I L L A T O R
P H A S E D E T E C T O R
P N 9 5 3 0 - 0 0
F c . T U N E
I N P U T
F c 1 0 0 M H z
O U T P U T
0 / + 1 0 V p + 1 0 H z
-
+ 1 0 d B m 5 0 W
R F I N P U T
E X T E R N A L I N P U T
5 0 0 m V M A X
+ 2 0 d B m M A X
1 0 0 W
- 1 0 / + 1 3 d B m M A X
5 0 W
L O I N P U T
+ 7 d B m M I N
5 0 W
2 n d L O I N P U T
+ 7 d B m M I N
5 0 W
R F S T D
R F H L
m
W A V E
E X T E R N A L
G P I B I n t e r f a c e C a b l e
Figure 3-5. Equipment Setup for Single Sideband Phase Noise Test
PERFORMANCE SINGLE SIDEBAND
VERIFICATION PHASE NOISE TEST
NOTE
The 69XXXB that is used as the lo-
cal oscillator (LO) must have Option
11 (0.1 Hz frequency resolution) in-
stalled.