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Boonton 25A Power Meter Calibrator “error.”

 

Recently someone has been selling brand new Boonton 25A Power Meter Calibrators on eBay at a great price. I picked one up to check my HP 478A mounts and 431C and 432A meters. I find a -5 dB error on all settings! The problem turns out to be that the 25A output (0-100 mW) is at 1 MHz. The 478A mounts are only rated down to 10 MHz and are seriously inaccurate below that.
 

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You can use 478A Opt.: h75 / h76 . They starts @1Mhz to 1GHz …?

Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
F:?+5411-4032-0072

On 29 Aug 2022, at 23:18, Steve J. Noll, WA6EJO <sjnoll@...> wrote:

?

Recently someone has been selling brand new Boonton 25A Power Meter Calibrators on eBay at a great price. I picked one up to check my HP 478A mounts and 431C and 432A meters. I find a -5 dB error on all settings! The problem turns out to be that the 25A output (0-100 mW) is at 1 MHz. The 478A mounts are only rated down to 10 MHz and are seriously inaccurate below that.
 

Buyer beware. Sometimes it's the small things that get you.

Stuart k6yaz
Los Angeles, California

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