[Test-Equipment] H-P 400 series

[Gary Chatters]

>
>Solid state:
>The E/EL was the natural successor to the D, H, and L, but with
>frequency response extended to 10 MHz.  The F/FL has additional
>sensitivity down to 100 uV F.S. (-90 dB), a 100 kHz low-pass filter, and
>response to 4 MHz.  The GL is a dB-optimized version having eight 20 dB
>ranges from -80 to +60 (1200 Vrms max input), a 4 MHz response, and its
>20 dB scale length is most suitable for communications and acoustical
>work.  All have a Zin of 10 Mohms.  The same caveats regarding manuals
>and repairs apply.
>

Fred,

That was an excellant and informative summary.  But there is just one
more point of difference that I would like to ask about: single-ended
vs. floating inputs.

The input connector to the E/EL is a BNC, so apparantly can only
measure ground referenced signals.  The F/FL/GL have binding posts,
so appear to be able to measure floating or differential signals.
I haven't found anything in the specifications that I have about
this difference.  Can you, or anyone, fill us in about the limitations
concerning the F/Fl/GL?

Thanks.

Gary