It's similar to the HP 3400A and the Ballantine 323. The HP 3403C is
a true thermal RMS meter, with 100MHz bandwidth.
And there the Millivac MV828-A which goes to just over 1GHz with 1mV FSD
(-50dBm with the 50 Ohm head)
Chopper amp and very stable...if you see one for sale make sure it comes with
the cable (Mil Spec style plug) and with the plug in 50 Ohm BNC terminator
And reliable..been using mine for over 10 years without a hiccup
And there is an Hp 3400B which doubles the hi end bandwidth over the A model
and has a solid state chopper.
The Ballantine 323A series is more versatile than the Hp 3400 series and has a much
larger scale with better reading accuracy with selectable input isolation
from case , (that the Hp hasn't), and several options, meter damping ranges, battery operation
and with bandwidths usually far in excess of the specs....the earlier ones used a mech
chopper , later ones were solid state, but specs very much the same for both.
Above might help if looking for a unit suitable for your purpose
John Byers
