s/n 404997
Taylor model 88B s/n 404997
Taylor model 88B s/n 404997
This 20 000 Ohms/Volt range multimeter which has a 37.5 microamp
movement is housed
in an wooden case with hinged lid. It was also made with a Bakelite
case which was available with a leather carrying case. The meter is
shunted by a universal
shunt to provide a sensitivity of 20 000 Ω/Volt on DC though the
maximum sensitivity on AC voltages is 2 000 Ω/Volt. The 88B is
essentially an updated version of the model 88A
View of the interior (battery box on the right)
Peter Ranshaw gave me this
multimeter which he felt needed a better home as he didn't see a Taylor
88B listed among my collection. He posted it in an Agfa-Gevaert box
which is where he thought it started its career but said it had been
been through several owners before retiring, along with him.
Like the AVO model 8 it
has a 37.5
microamp movement and has a universal shunt to reduce the sensitivity
to
50 microamps. When I first tried it with a 9 volt PP3 it indicated
about 12volts rather than 9 so I suspected that the universal shunt
might have an open circuit resistor. The meter worked correctly on the
current ranges but a tad low (4.8 instead of 5 mid scale) though the DC
voltage ranges were adrift. After opening it up and finding an
instruction manual at http://raremanualdepository.blogspot.com/ I found
that the volt ranges are partially separate from the shunt and
that the error must have been caused by a bad contact on one of the
switches as the voltage ranges then miraculously worked more or less
correctly. Whilst the movement was out I stripped and re-varnished the
box and it now looks much more presentable.
Unlike the AVO the meter movement is totally enclosed so calibration
and adjustment of the sensitivity is via variable slider resistors of
which there are four. I am reluctant to meddle as I guess they must be
tweaked in the correct order.
The cut out mechanism operates a micro switch the underside of which can be seen reflected in the rear of the scale plate
Batteries Like the AVO model
8 meters the Taylor 88B was made to use a U2 1.5 volt cell and a
B121 15 volt battery.
How old is it? Mid 1960s when it would have cost in the region of �26
What is it worth? Maybe �10-�20
