Table of Contents
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N5224A/25A 4-Port Overall Block Diagram
(Includes Options 400-Standard; 401-Configurable
Test Set; 4
17-Attenuators; and 419-Bias Tees
Service Guide: N5225-90001
A55
A21 CPU
HARD DISK
DRIVE
A20
(1)
1
(2)
2
(3)
3
4
(4)
(5)
5
POWER
Mixer
A19 MIDPLANE
SUPPLY
Brick L.O.
Band
A7/A8/A12/A13
Harmonic
A15 Synthesizer
A25 HMA26.5
A4/A17 Synthesizer
A5/A10 Source
AC LINE IN
50 GHz Doubler
Number
Frequency (GHz)
Frequency (GHz)
Frequency (GHz)
Frequency (GHz)
A22
Frequency (GHz)
GPIB
0
-
-
-
-
-
-
1
-
-
-
-
-
-
2
1
0.01083 to 0.05383
0.01083 to 0.05383
0.010 to 0.053
0.010 to 0.053
0.010 to 0.053
3
1
0.06044 to 0.18244
0.06044 to 0.18244
0.053 to 0.175
0.053 to 0.175
0.053 to 0.175
4
1
0.18244 to 0.25744
0.18244 to 0.25744
0.175 to 0.250
0.175 to 0.250
0.175 to 0.250
5
1
0.25744 to 0.50744
0.25744 to 0.50744
0.250 to 0.500
0.250 to 0.500
0.250 to 0.500
6
1
0.50744 to 1.0074
0.50744 to 1.0074
0.500 to 1.000
0.500 to 1.000
0.500 to 1.000
7
1
1.0074 to 2.0074
1.0074 to 2.0074
1.000 to 2.000
1.000 to 2.000
1.000 to 2.000
8
1
2.0074 to 3.0074
2.0074 to 3.0074
2.000 to 3.000
2.000 to 3.000
2.000 to 3.000
9
1
3.0074 to 3.2074
3.0074 to 3.2074
3.000 to 3.200
3.000 to 3.200
3.000 to 3.200
10
1
3.2074 to 4.0074
3.2074 to 4.0074
3.200 to 4.000
3.200 to 4.000
3.200 to 4.000
11
1
4.0074 to 5.3394
4.0074 to 5.3394
4.000 to 5.332
4.000 to 5.332
4.000 to 5.332
12
1
5.3394 to 6.7594
5.3394 to 6.7594
5.332 to 6.752
5.332 to 6.752
5.332 to 6.752
13
1
6.7594 to 8.0074
6.7594 to 8.0074
6.752 to 8.000
6.752 to 8.000
6.752 to 8.000
14
1
8.0074 to 10.6714
8.0074 to 10.6714
8.000 to 10.664
8.000 to 10.664
8.000 to 10.664
15
1
10.6714 to 13.5174
10.6714 to 13.5174
10.664 to 13.510
10.664 to 13.510
10.664 to 13.510
16
1
6.7587 to 7.7037
13.5174 to 15.4074
6.755 to 7.700
13.510 to 15.400
13.510 to 15.400
17
1
7.7037 to 8.0037
15.4074 to 16.0074
7.700 to 8.000
15.400 to 16.000
15.400 to 16.000
18
1
8.0037 to 9.5037
16.0074 to 19.0074
8.000 to 9.500
16.000 to 19.000
16.000 to 19.000
19
1
9.5037 to 10.0037
19.0074 to 20.0074
9.500 to 10.000
9.500 to 10.000
19.000 to 20.000
20
1
10.0037 to 10.6677
20.0074 to 21.3354
10.000 to 10.664
10.000 to 10.664
20.000 to 21.328
21
1
10.6677 to 12.0037
21.3354 to 24.0074
10.664 to 12.000
10.664 to 12.000
21.328 to 24.000
22
1
12.0037 to 13.2537
24.0074 to 26.5074
12.000 to 13.250
12.000 to 13.250
24.000 to 26.500
23
3
8.8358 to 9.0051
8.8358 to 9.0051
13.250 to 13.504
13.250 to 13.504
26.500 to 27.008
24
3
9.0051 to 10.6691
9.0051 to 10.6691
6.752 to 8.000
13.504 to 16.000
27.008 to 32.000
25
3
10.6691 to 13.5025
10.6691 to 13.5025
8.000 to 10.125
16.000 to 20.250
32.000 to 40.500
26
3
6.7512 to 7.1106
13.5025 to 14.2211
10.125 to 10.664
20.250 to 21.328
40.500 to 42.656
27
3
7.1106 to 7.2512
14.2211 to 14.5025
10.664 to 10.875
21.328 to 21.750
42.656 to 43.500
50 OHM
LOAD
W59
28
3
7.2512 to 7.7012
14.5025 to 15.4025
10.875 to 11.550
21.750 to 23.100
43.500 to 46.200
0.01 - 26.5 GHz
29
3
7.7012 to 8.0012
15.4025 to 16.0025
11.550 to 12.000
23.100 to 24.000
46.200 to 48.000
50 OHM
LOAD
W56
30
3
8.0012 to 8.3346
16.0025 to 16.6691
12.000 to 12.500
24.000 to 25.000
48.000 to 50.000
3.2 - 19 GHz
A14 FREQUENCY REFERENCE
10 MHz
W78
J3
10 MHz
REF OUT
10 MHz
HIGH ST AB
Test Node
Error Description
OCXO
Assembly
Frequency Band
A5
0.01 - 13.5 GHz
DAC
8
Unleveled, Source 1, Out 1
A7
13.5 - 50 GHz
A5
0.01 - 13.5 GHz
215
9
Unleveled, Source 1, Out 2
A8
13.5 - 50 GHz
10 MHz
W79
10 MHz
J2
10
Unleveled, Source 1 Synthesizer
A4
Full Range
REF IN
A10
0.01 - 13.5 GHz
11
Unleveled, Source 2, Out 1
A12
13.5 - 50 GHz
A10
0.01 - 13.5 GHz
12
Unleveled, Source 2, Out 2
A13
13.5 - 50 GHz
13
Unleveled, Source 2 Synthesizer
A17
Full Range
A23 TEST SET MOTHERBOARD
BIAS 1 IN
14
Unleveled, LO Drive
A25
Full Range
15
Unleveled, LO Synthesizer
A15
Full Range
16
Unlocked, Source 1 Synthesizer, Integrator Low
A4
Full Range
17
Unlocked, Source 1 Synthesizer, Integrator High
A4
Full Range
BIAS 3 IN
19
Unlocked, Source 2 Synthesizer, Integrator Low
A17
Full Range
20
Unlocked, Source 2 Synthesizer, Integrator High
A17
Full Range
22
Unlocked, LO Synthesizer, Integrator Low
A15
Full Range
BIAS 4 IN
23
Unlocked, LO Synthesizer, Integrator High
A15
Full Range
25
Unleveled, Doubler 1 Prelevel
A7
13.5 - 50 GHz
26
Unleveled, Doubler 2 Prelevel
A8
13.5 - 50 GHz
BIAS 2 IN
27
Unleveled, Doubler 3 Prelevel
A12
13.5 - 50 GHz
28
Unleveled, Doubler 4 Prelevel
A13
13.5 - 50 GHz
29
Unleveled, Source 1, P4
A5
13.5 - 50 GHz
30
Unleveled, Source 2, P4
A10
13.5 - 50 GHz
14 Feb 2014
N5225A_blk_4port
)
A3
A2
DISPLAY
USB BD
A16 SIGNAL PROCESSING
ADC MODULE (SPAM)
USB
HUB
DISPLAY
INVERTER
9 MHz
KEYPAD
PROCESSOR
POWER
FLASH
15 MHz
SPEAKER
9 MHz
A1 FRONT PANEL INTERFACE BOARD
15 MHz
PCI BUS
9 MHz
15 MHz
9 MHz
15 MHz
9 MHz
15 MHz
A18
SYSTEM
POWER BUS
MOTHERBOARD
LOCAL DIGITAL BUS
DITHER
PULSE
NOISE
DRIVE
DIRECT CONNECT
10 MHz REF
A23
HIGH DENSITY DATA BUS
TO A4, A5, A7, A8,
A10, A12, A13,
TEST SET
A14, A15, A17
MOTHERBOARD
POWER BUS
LOCAL DIGITAL BUS
MIXED POWER AND CONTROL SIGNALS
FROM THE
A23 TEST SET MOTHERBD
SERIAL TEST BUS NODES
Bx = ACTIVE SOURCE BAND
10 MHz REF
EXT TEST SET DRIVE LO OUT
EXT TEST SET DRIVE RF1 OUT
A15 13.5 GHz LO SYNTHESIZER
A25 LO MULTIPLIER/AMPLIFIER 26.5 (HMA26.5)
B13,
6.75-8.0 GHz
B15,
10.66-13.51 GHz
2-4 GHz
16-17,26-29
21-22,25
B14-15,
18-25,
30
B12,15,
5.33-6.75 GHz
X2
B11-30
21-22,25
8.0-10.66 GHz
MAIN
X2
22,23
1
B11,14,
4.0-5.33 GHz
B14,
18-20,
18-20,
Frac-N
23-24,30
23-24,30
ƒ
Logic
B2-30
3.0-4.0 GHz
B9-10
0.011-13.517 GHz
-10 to +10 dBm
50 MHz
W51
REF
2.0-3.0 GHz
B11-13,
J1207
16-17,26-29
J5
B8
15
10 MHz
B6-10
ALC
10 MHz REF
W74
1.0-2.0 GHz
J4
B7
2
50 MHz
B5
B2-4
50 MHz REF
W75
0.5-1.0 GHz
2
B6
J5
250 MHz
W76
J6
LOCAL
DDS
0.25-0.5 GHz
DIGITAL
100 MHz
W77
BUS
B5
10
J7
POWER
B2-4
ƒ
BUS
DDS=Direct Digital Synthesizer
NC
J8
200 Hz
21 1
A17 13.5 GHz SOURCE 2 SYNTHESIZER
B15,
A10 26.5 GHz SOURCE (SOURCE 2)
B13,
6.75-8.0 GHz
21-23,
10.66-13.51 GHz
2-4 GHz
16-17,24
27-30
B14-15,
18-23,
B12,15,
5.33-6.75 GHz
25-30
X2
B11-30
21-23,27-30
8.0-10.66 GHz
MAIN
X2
19,20
B11,14,
B14,
18-20,
4.0-5.33 GHz
18-20,
Frac-N
25-26
25-26
ƒ
Logic
3
B2-30
3.0-4.0 GHz
0.01-13.51 GHz
B9-10
-10 to +10 dBm
DC BIAS 1 TO A42
50 MHz
W2
J541
REF
2.0-3.0 GHz
B11-13,
16-17,24
J1207
P1
J5
B8
13
B6-10
ALC
1.0-2.0 GHz
B7
DC BIAS 3 TO A43
2
J542
B5
B2-4
0.5-1.0 GHz
250 MHz
B6
LOCAL
DDS
LOCAL
DC BIAS 4 TO A44
DIGITAL
0.25-0.5 GHz
DIGITAL BUS
J543
BUS
B5
B2-4
POWER
POWER
BUS
BUS
DDS=Direct Digital Synthesizer
DC BIAS 2 TO A45
J544
A4 13.5 GHz SOURCE 1 SYNTHESIZER
B15,
A5 26.5 GHz SOURCE (SOURCE 1)
B13,
6.75-8.0 GHz
10.66-13.51 GHz
21-23,
2-4 GHz
16-17,24
B14-15,
27-30
18-23,
25-30
B11-30
B12,15,
5.33-6.75 GHz
X2
8.0-10.66 GHz
21-23,27-30
MAIN
X2
16,17
B11,14,
B14,
18-20,
4.0-5.33 GHz
18-20,
25-26
25-26
ƒ
Frac-N
Logic
3
POWER
BUS
3.0-4.0 GHz
B2-30
0.01-13.51 GHz
TO
B9-10
-10 to +10 dBm
W1
A34 THRU A37,
50 MHz
A42 THRU A49
REF
B11-13,
2.0-3.0 GHz
16-17,24
J1207
P1
J5
B8
LOCAL
10
DIGITAL BUS
B6-10
ALC
1.0-2.0 GHz
B7
2
B5
B2-4
0.5-1.0 GHz
B6
250 MHz
LOCAL
DDS
LOCAL
0.25-0.5 GHz
DIGITAL BUS
DIGITAL
B5
BUS
POWER
POWER
B2-4
BUS
BUS
DDS=Direct Digital Synthesizer
A24 IF MULTIPLEXER
IF = 0.826 MHz for CW Freq < 53 MHz
IF = 7.438 MHz for CW Freq > 53 MHz
Main IF A
10.7 MHz
P1
PulseA
PULSE
GATES
W69
EXT IF IN A
P3
W61
AUX R4
W70
W62
Main IF B
P201
10.7 MHz
Pulse B
PULSE
GATES
W63
W71
P203
EXT IF IN B
R1
P411
AUX R3
W64
R2
W72
P412
Main IF R
10.7 MHz
R3
Pulse R
PULSE
P413
W73
P403
GATES
EXT IF IN R
R4
P414
Main IF C
P601
10.7 MHz
Pulse C
PULSE
GATES
P603
EXT IF IN C
AUX R2
Main IF D
P801
10.7 MHz
Pulse D
PULSE
GATES
EXT IF IN D
P803
AUX R1
PULSE
MODULATION
LOGIC
SOURCE
PULSE
DRIVE OUT
W56
W55
3.2 - 19 GHz
A7 50 GHz
DOUBLER
P5
40.5-50 GHz
B26-30
ALC
32-40.5 GHz
Modulator
B25
W5
P4
X2
24-32 GHz
B22-24
25
W6
19-24 GHz
B19-21
P3
B16-18
13.5 - 19 GHz
20.0-26.5 GHz
A26 SPLITTER
2
B20-22
15.4-20.0 GHz
W53
10 MHz - 13.5 GHz
B16-22,
26-30
26 GHz
0.011 -
W52
P1
X2
26.507 GHz
B17-19,
29-30
W54
13.5-15.4 GHz
B16,
14
26-28
511
50 OHM
A12
50 GHz
LOAD
DOUBLER
P5
13 GHz
40.5-50 GHz
B2-15,23-25
B26-30
0.011-13.517 GHz
FROM
A23
ALC
32-40.5 GHz
Modulator
B25
W9
P4
X2
24-32 GHz
B22-24
27
W10
19-24 GHz
B19-21
P3
B16-18
13.5 - 19 GHz
J402
P4
20-26.5 GHz
10 MHz - 13.5 GHz
B26-30
30
P1
16-20 GHz
B16-30
B18,25
B10-30
X2
B10-15
B10-15
13.5-16 GHz
50 OHM
B16-18,
B16-17,24
ALC
A13
50 GHz
LOAD
Modulator
B2-15
24-30
Pulse
11
DOUBLER
P5
0.01-13.5 GHz
W7
40.5-50 GHz
Modulator
OUT 1
B10-15,19-23
B26-30
P5
B2-9
ALC
32-40.5 GHz
B10-15
Modulator
B25
B2-15
4
12
P4
X2
B2-9
24-32 GHz
B2-15
ALC
B22-24
0.01-13.5 GHz
OUT 2
W8
50 OHM
28
Modulator
LOAD
P3
19-24 GHz
3.2 GHz
B19-21
B2-9
B2-9
P3
P2
P6
B16-18
13.5 - 19 GHz
ALC
Pulse
Modulator
Modulator
10 MHz - 13.5 GHz
P1
J402
P4
20-26.5 GHz
B26-30
29
50 OHM
A8
50 GHz
LOAD
16-20 GHz
B16-30
B18,25
DOUBLER
P5
X2
B10-30
40.5-50 GHz
B26-30
B10-15
B10-15
13.5-16 GHz
B16-17,24
ALC
B16-18,
32-40.5 GHz
24-30
Modulator
8
B2-15
ALC
Pulse
0.01-13.5 GHz
W3
Modulator
B25
Modulator
OUT 1
W6
B10-15,19-23
P4
P5
X2
24-32 GHz
B2-9
B22-24
B10-15
50 OHM
26
B2-15
LOAD
9
4
19-24 GHz
B19-21
B2-9
B2-15
P3
ALC
0.01-13.5 GHz
W4
B16-18
13.5 - 19 GHz
Modulator
OUT 2
P3
3.2 GHz
B2-9
B2-9
P2
P6
10 MHz - 13.5 GHz
ALC
ALC
Pulse
Pulse
P1
Modulator
Modulator
Modulator
Modulator
TO A27 A
A27 MIXER BRICK (1)
OPTION 400 OR 410
70.0 MHz
A68 ATTEN
A
A
I
R
L
Direct
W107
Connection
to A27 R1
3 dB
70.0 MHz
R1
R1
OPTION 401, 417, OR 419
I
R
L
A37 REF
SWITCH
W42
RCVR R1 IN
W43
70.0 MHz
W36
REF 1
R2
R2
I
R
L
SOURCE OUT
W41
W21
70.0 MHz
B
B
I
R
L
TO A28 C
OPTION 400 OR 410
W108
W57
EXT TSET DRIVE LO OUT
OPTION 401, 417,
OR 419
RCVR R3 IN
W44
W36
REF 3
W25
SOURCE OUT
RECEIVER LO DRIVE
TO A28 D
OPTION 400 OR 410
A28 MIXER BRICK (2)
W109
70.0 MHz
W65
D
I
R
D
OPTION 401, 417,
L
OR 419
A69 ATTEN
W45
RCVR R4 IN
70.0 MHz
W66
R4
R4
W36
REF 4
I
R
L
3 dB
W29
SOURCE OUT
W67
70.0 MHz
R3
R3
I
R
L
70.0 MHz
W68
C
I
R
C
TO A27 B
L
OPTION 400 OR 410
W110
OPTION 401, 417,
OR 419
W46 - (401)
W47 - (417,419)
RCVR R2 IN
CAP
W36
REF 2
SOURCE OUT
W33
OPTION 400
A29 RECEIVER
OPTION 401,
RECEIVER LO DRIVE
COUPLER
417, OR 419
P2
A38 STEP
ATTEN
32-50 GHz
W81 - (417,419)
B25-30
W107 (400,410)
19 - 50 GHz
26.5-32 GHz
W21 (401,417,419)
B23-24
8
OPTION 410
A64 ATTEN
19.5-26.5 GHz
5
ALC
19-50 GHz
B19-22
Modulator
Pulse
P6
W11
W12
Direct
Modulators
Connection
to A29
20 GHz
13.5-19.5 GHz
Pulse
Modulator
OPTION 400
A30 RECEIVER
OPTION 401,
COUPLER
417, OR 419
P2
32-50 GHz
A39 STEP
B25-30
ATTEN
19 - 50 GHz
26.5-32 GHz
W85 - (417,419)
B23-24
11
W108 (400,410)
W25 (401,417,419)
19.5-26.5 GHz
5
ALC
19-50 GHz
B19-22
W13
OPTION 410
Modulator
Pulse
P6
Modulators
A65 ATTEN
Direct
20 GHz
Connection
to A30
13.5-19.5 GHz
Pulse
Modulator
OPTION 400
A31 RECEIVER
OPTION 401,
P2
COUPLER
417, OR 419
32-50 GHz
B25-30
19 - 50 GHz
26.5-32 GHz
A40 STEP
B23-24
12
ATTEN
W89 - (417,419)
19.5-26.5 GHz
5
ALC
19-50 GHz
B19-22
Modulator
Pulse
P6
W15
W16
W109 (400,410)
Modulators
W29 (401,417,419)
OPTION 410
20 GHz
A66 ATTEN
Direct
13.5-19.5 GHz
Connection
Pulse
to A31
Modulator
OPTION 400
P2
A32 RECEIVER
OPTION 401,
32-50 GHz
COUPLER
417, OR 419
B25-30
19 - 50 GHz
26.5-32 GHz
B23-24
9
A41 STEP
19-26.5 GHz
ALC
19-50 GHz
5
ATTEN
B19-22
W18
Modulator
Pulse
P6
W17
Modulators
W93 - (417,419)
W110 (400,410)
20 GHz
W33 (401,417,419)
OPTION 410
A67 ATTEN
13.5-19.5 GHz
Pulse
Modulator
Direct
Connection
to A32
OPTION 400 OR 410
TO A27 A
W115
FROM A33
OPTION 401
RCVR A IN
W37
TO A27 A
W36
Port 1
W22
FROM A33
CPLR ARM
OPTION 417
A46 STEP
OR 419
ATTEN
W98
W97
RCVR A IN
TO A27 A
W36
Port 1
0-50 dB
W22
CPLR ARM
FROM A33
OPTION 400 OR 410
TO A28 C
W116
FROM A34
OPTION 401
RCVR C IN
W38
TO A28 C
W26
W36
Port 3
FROM A34
CPLR ARM
OPTION 417
A47 STEP
OR 419
ATTEN
RCVR C IN
W100
W99
TO A28 C
W36
Port 3
0-50 dB
W26
CPLR ARM
FROM A34
OPTION 400 OR 410
TO A28 D
W117
FROM A35
OPTION 401
W39
RCVR D IN
TO A28 D
W30
W36
Port 4
FROM A35
CPLR ARM
OPTION 417
A48 STEP
OR 419
ATTEN
W102
W101
RCVR D IN
TO A28 D
W36
Port 4
0-50 dB
W30
CPLR ARM
FROM A35
OPTION 400 OR 410
TO A27 B
W118
FROM A36
OPTION 401
RCVR B IN
W40
TO A27 B
W36
Port 2
W34
FROM A36
CPLR ARM
OPTION 417
A49 STEP
OR 419
ATTEN
W104
W103
RCVR B IN
TO A27 B
W36
Port 2
0-50 dB
W34
CPLR ARM
FROM A36
Port 1
SOURCE OUT
W36
CPLR THRU
W111
To Port 1
A33
W36
TEST PORT
COUPLER
W19 - (401)
W20 - (401,417)
PORT 1
To Port 1
A42 BIAS
W36
DC BIAS 1
TEE
W82 - (417,419)
W83 - (419)
W84 - (419)
W115 (400,410)
0-50 dB
W22 (401,417,419)
W119
6 dB
Port 3
SOURCE OUT
W36
CPLR THRU
W112
A34
To Port 3
W36
TEST PORT
COUPLER
W23 - (401)
W24 - (401,417)
PORT 3
To Port 3
W36
A43 BIAS
DC BIAS 3
TEE
W86 - (417,419)
W87 - (419)
W88 - (419)
0-50 dB
W116 (400,410)
W26 (401,417,419)
W120
6 dB
Port 4
SOURCE OUT
W36
CPLR THRU
W113
A35
To Port 4
W36
TEST PORT
COUPLER
W27 - (401)
W28 - (401,417)
PORT 4
To Port 4
W36
A44 BIAS
DC BIAS 4
TEE
W90 - (417,419)
W91 - (419)
W92 - (419)
0-50 dB
W117 (400,410)
W30 (401,417,419)
W121
6 dB
Port 2
SOURCE OUT
W36
CPLR THRU
W114
A36
To Port 2
W36
TEST PORT
COUPLER
W31 - (401)
W32 - (401,417)
PORT 2
To Port 2
W36
A45 BIAS
DC BIAS 2
TEE
W94 - (417,419)
W95 - (419)
W96 - (419)
0-50 dB
W118 (400,410)
W34 (401,417,419)
W122
6 dB
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Troubleshooting
