Re: Tek 2235 with long persistence orange screen and unknown opt 76
Before digital storage, CRTs with P7 (or other long-persistence phosphor)toggle quoted messageShow quoted text
were used for physiological monitoring. The early patient monitors in ICUs
and ORs had these CRTs. The reason was that with the long persistence, the
trace would be visible on the screen for several seconds - usually long
enough for the trace to cross the screen. Sweep speed was usually in the
neighborhood of 25mm/sec. Nurses and physicians could see the trend in some
signal like an EKG or pulse oximeter over the past few seconds rather than
just the single waveform or two.
HP/Sanborn made a lot of these systems. Tektronix made monitors for these
systems but I don’t know if HP/Sanborn used them.
I had a Heathkit scope called an “IMPScope” - Instrumentation Methods for
Physiological Studies. It had a P7 phosphor tube in it. It also had an
electrical stimulator for nerve or muscle studies.
Digital storage changed all this.
On Tue, Jan 26, 2021 at 10:35 Harvey White <email@example.com> wrote: