Modification of the binding post adapter Fluke 5790A-7001 into Fluke 792A-7004

Intro

Optional Fluke 5790A-7001 adapter converts AC current shunt interface connector UHF into high-quality dual 5-way binding post terminals. This is often used to connect AC current shunts to AC sources and AC measurement systems such as Fluke 5790A, 5720A calibrators and similar metrology equipment.

However, if calibration require connection of the shunt to AC/DC transfer standard, such as Fluke 792A, this 5790A-7001 adapter cannot be used directly. Fluke 792A uses more popular RF Type N connector, so equivalent adapter is called Fluke 792A-7004. However it’s quite rare to find on used market, so in this article we used extra Fluke 5790A-7001 to perform a conversion into 792A-7004.

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Modification

This is how 792A-7004 looks like, with Type-N male receptacle on input side, and 5-way copper non-plated low-thermal posts on other. Otherwise it’s the very same thing.

Brand new flange mount Type N Amphenol RF 172118 connector was acquired, which have impedance at 50 Ω and rated up to 11 GHz, with insertion loss 0.15 dB.

This should do just fine for <1.2 MHz range of typical LF/AC systems like Fluke 5700/5720, 5790A or 792A or Wavetek 4920M.

Heating adapter helped to remove mylar film, which held by thick layer of adhesive pad.

Connector held by 4 screws and have single point soldered pin. No problems to remove original UHF connector.

Now new Type-N connector is installed and adapter ready to be assembled in reverse procedure.

Just two flat-head screws on top, and adhesive layer for decorative mylar.

Comparison of original 5790A-7001 and new “792A-7004”. Only drawback is different model number :)

Both adapters connected with UHF-N and N-N adapter :)

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Author: Illya Tsemenko
Published: Aug. 14, 2018, 2:55 a.m.
Modified: Aug. 14, 2018, 3:06 a.m.

References

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