HP 8702B Lightwave Component Analyzer
Electro Optical Network Analyzer
© Brooke Clarke 2013
For some time I've wanted a way to test microwave compents at frequencies as high as 2.4 Ghz. The HP 4395A is a fantastic Network, Spectrum and Impedance analyzer, but has an upper frequency limit of 500 MHz. The HP 8753 was on my wish list, but even used they are still very pricey. It turns out that the 8702B is a combined network analyzer with both optical and electronic modes and is in every way very similar to the 8753.
The HP 11876A is the upgrade kit for the 8753A to make it into the 8702A.
8702B Option 6 increases the upper frequency from 3 to 6 GHz
8702B Option 011 deletes time domain
8702B Option 802 adds a disk drive and cable
The 8703A covers 130 MHz to 20 Ghz
Many of the buttons are the same as or similar to those on the HP 4395A Network, Spectrum & Impedance analyzer. But there are some differences in how they work.
For example in the 4395A you can make a measurement using only the source and one of the receivers (R, A or B), but it appears that you can not do that on the 8702B.
I was able to use the source and R port and do a through response cal, but get an error message.
Source power tripped. Reset under power menu.
The display shows:
HP8702B.01.00: Jun 28, 1989
Installed Options: 011
Opt 011 is delete time domain.
Cal: Response Source-> R
DUT: S Band power splitter Isolation
Marker at 2.7 Ghz -23 dB
Error Message: "Phase Lock Lost"
In order to take off the top or bottom covers you need special tools are needed, Torx for the rear screw that holds on the cover, but first ___tbd____ to remove the rear feet.
The basic frequency coverage needs to be 300 kHz to 3 Ghz.
The 8702 (and probably the 8753) require a reference input for electrical measurements like S11 or S21.
Some test sets only allow measuring S11 and S21 at the same time and require physically reversing the DUT to measure S22 and S12. This is the simplest practical test set and is what I'm looking into building.
Factory
85044A S11 & S21 only
85046A 3 GHz, solid state switches
85047A 6 GHZ (built-in doubler) solid state switches
Home Made Test Set
It may be possible to make or find a test set. A quick look shows VNA kits with upper frequency limits of 500 MHz or 1.3 GHz, not 3 GHz.
Couplers
So far I haven't found a coupler that's suitable.
The Mini Circuits: ZFDC-ED13365/1 and or ZFDC-ED13343/2 may work. 26 Apr 2013 I'm looking into them.
Bridges
Bridges work down to DC and so may offer another approach. The HP 4380A uses bridges and it works up to 1.8 GHz, but need to try it to see how it does at 3 GHz.
Power Dividers
Are for dividing the input power into two outputs where all the outputs are matched. Amplitude tracking is in the 0.5 dB range and isolation between outputs about 20 dB.
11636A
11636B
11636C
87302C
87303C
87304C
App Note: 5990-5215ENPower Splitters
Are for power leveling or making radio measurements. Amplitude tracking is in the 0.2 dB range and output isolation is not specified.
11667A -
11667B
11667C
11667L
App Note: 5990-5351EN
Mini Circuits:
ZFRSC-42-S+ 50 kHz to 4.2 GHz
Most of the below catalogs I have, but they are also on line at: http://www.hparchive.com/hp_catalogs.htm
The words light wave don't appear at all in the 1987 catalog.
Year
Lightwave Models
$ 8702
Page
8753 Models
1987
na
na
na
8753A
1988
na
na
na
8753A 1989
8702A
28,000
312 - 313
8753B 1990
8702B, 8703A 32,800
312 - 313 8753C 1991
33,600
332 - 333
8753C 1992
8702B, 8703A
34,600
382 - 383
8753C
1993
8702B, 8703A 37,245
566 - 567
8753C
1995
8702B, 8703A 38,000
484 - 485
8753D 1996
1997
8702D na
425
8753D 1998
8702D na
428
8753D
These VNAs all have built-in controllers. The prior 8410 VNA was used either manually (no error correction) or with an external computer.
Model
Freq
Test Set
Conn
Display
Comments
8753A
300 kHz - 3 GHz
85046A
Mono CRT
slow CPU
8702A
8753B 300 kHz - 6 GHz
85047A
Mono CRT
8702B
8753C 300 kHz - 6 GHz 85047A
Color CRT
8753D 30 kHz - 6 GHz Built-in
Color CRT Floppy drive
8753E
30 kHz - 6 GHz Built-in 7 mm
Color LCD
upgradable firmware
8753ES
30 kHz - 6 GHz
3.5 mm
new front panel
8753ET 300 kHz - 3 GHz
300 kHz - 6 GHz
N
based on the 8752 300k - 1.3 G
HP11885A 3 G upgrade kit
Manuals
HP Journal
Bench Briefs
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page created 12 Apr 2013.
