Keysight Technologies N5244/5B Service Manual page 490

Replaceable Parts
Replaceable Parts Listings
4-Port Configuration, Option 423 with and without 029, S/N Prefixes
≥6021
The following may apply to your B model PNA: In August 2020, the
N5224/44B and N5225/45B analyzers underwent multiple hardware
changes. Some instruments that have A25 – 5087-7765 HMA26.5
multiplier amplifier (with a discrete A26 power splitter and some
semi-rigid cables) and A27/A28 – 5087-7323/5087-6323 mixer bricks
(with 50 ohm pads and some semi-rigid cables) and were replaced with
integrated components: A25 – N5240-60101 (with a power splitter) and
A27/A28 – 5087-/5087-6417 (with the 50 ohm pads). Refer to the tables
in this section of the manual to learn which assemblies and cables may be
impacted by these changes.
The mixer block and 50 ohm pad changes do not impact PNAs with
Options 210/410. But, the HMA26.5 multiplier amplifier changes are
potentially applicable to all Options.
Be very careful to use the appropriate hardware in your analyzer. Using the
wrong hardware can ruin analyzer components, resulting in additional
customer costs.
Bottom Assemblies, 4-Port, Option 423 with and without 029, S/N
Prefixes ≥6021
Reference
Part Number
Designator
A23 N5245-60157
Was N5245-60003
A24 N5240-60062
Was N5245-60127
N5240-60101
c
A25
Was: 5087-7765
Was 5087-7711
A27 5087-7417
A28 5087-6417
Was: 5087-7323
5087-6323
A29 5087-7760
A30
Was 5086-7658
A31
A32
A33 5087-7793
A34
Was 5087-7724
A35
A36
A37 5087-7759
Was 5087-7271
6-256
Qty Description
a
1 Test set motherboard
1
IF multiplexer board
1 LO Multiplier/amplifier 26.5 (HMA26.5)
2 Mixer brick
4 Test port 1 reference coupler
Test port 3 reference coupler
Test port 4 reference coupler
Test port 2 reference coupler
4 Test port 1 coupler
Test port 3 coupler
Test port 4 coupler
Test port 2 coupler
1 Reference mixer switch
b
Keysight N5244B/45B Service Guide