That would be a nylon screw, not teflon. It secures the head to the
body - removing it and the Allen setscrew(s?) at the cable end allows you
to slip the body back and expose the attenuator, as Steve says.
There's also a standard machine screw at the rear for attaching
the ground wire. The March 1953 catalog has a cutaway view in the
Accessories section.
That _is_ Tek's first passive probe, but it is a P510 (or P510A), not a P4xx.
The P400 series was the fast-rise probe, with color-coded head
(brown for 10x) and high-impedance resistance-wire coax. It first
appears in the August 1955 catalog, six months after the 545. Since it
was more expensive than the P510 ($10.50 vs 8.50), Tek would probably
not pair it with a scope that didn't need it.
Dave Wise
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-----Original Message-----
From: TekScopes@...
[mailto:TekScopes@...] On Behalf Of Steve
Sent: Monday, July 02, 2012 10:22 AM
To: TekScopes@...
Subject: [TekScopes] Re: Trivia- can you identify these
probes/probe accessories circa 1960 (or before)?
Photo C is the probe body for the P400 or P410 probe - Tek's
first passive probes. While the electrical design is
adequate, the simple mechanical design does not give the
greatest ease in connecting with the circuit under test. Tek
replaced these with the P60xx series, introduced in the late
1950's, and produced is amazing volume through the mid 1990's
- one of the longest running Tek product. (The record goes to
the original P6015, which was only replaced by the P6015A in
1995 because the Freon dielectric was no longer available.)
The P400 may have been the standard probe with the original
(non-A) model 310. All 310A units shipped with the P6017.
I have never seen a P400 series probe, so I can't comment on
the teflon screw. Possibly access to the probe tip attenuator
components?
- Steve
