[R-390] FS: Hewlett Packard HP-410-C VTVM

Mon, 14 Oct 2002 22:07:59 +0200

No Chuck you mixed it up, this is true for the Boonton
RF-Millivoltmeters Model 92 or something but does not apply to the
HP-410B and HP-410C. Also check the manual, there is nothing written
about not to change the probe. 
You have to adjust a pot inside the meter to set the filament voltage
but that's all you need to do. The voltage is either 5V or 6.3V
depending on the tube (2-01C or EA53) used in the probe. I have acquired
a separate probe on eBay (much cheaper than a 2-01C from AES) for the
HP-410B which was still sealed in the military packing and it works
exactly as the original probe. The probe for the HP-410B is wired to a
terminal block underneath the instrument. The probe for the HP-410C has
a standard 1/4" plug. The schematic for both probes looks identical.
Check eBay for probes or a broken HP-410B/HP-410C with probe. I have
seen both going quite cheap. 

73
de Heinz DH2FA, KM5VT

JM/CO wrote:
> 
> The AC / RF probes for these models were matched to the particular unit
> during manufacture. Once the probe is lost, it is not possible to plug in
> just any random probe and have the meter function properly. Over the years,
> I have seen many 410-Cs for sale without probes, but have Never seen a
> separate probe for sale anywhere. Wonder where they go?
> Chuck N1LNH
> ----- Original Message -----
> From: "Michael Crestohl" <[email protected]>
> To: <[email protected]>; <[email protected]>
> Sent: Monday, October 14, 2002 1:35 PM
> Subject: [R-390] FS: Hewlett Packard HP-410-C VTVM
> 
> >
> > Hi Gang:
> >
> >
> > I have an extra HP 410-C VTVM which is the lab-grade VTVM that Collins
> > used on the line and in the engineering department when the S-Line was
> > produced.  It is one of the recommended pieces of test equipment in
> > the service manuals.  Unfortunately I do not have the AC/RF probe
> > and have priced the meter accordingly at $75.00 plus shipping.
> >
> >
> > Any interest from the group before I post it you-know-were??
> >
> >
> > 73,
> >
> >
> > Michael
> >
> >
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