Heathkit Oscilloscopes

I recently picked up a Heathkit IO-10 oscilloscope which I will be restoring and then highlighting in a YouTube video.

A recent post to a Heathkit mailing list asked about a complete list of Heathkit oscilloscopes. My book Classic Heathkit Test Equipment has a chapter of oscilloscopes and includes scopes in a table of all of the Heathkit test equipment.

Here, taken from my book, is a list of all of the models of oscilloscopes I was able to identify through a number of sources. They are sorted by date of introduction. I was able to identify 67 unique models, made from 1947 to 1989.

Model	Description	First Year	Comments
O-1	Oscilloscope	1947	5”
O-2	Oscilloscope	1948	5”
O-3	Oscilloscope	1948	5”, 150 kHz
O-4	Oscilloscope	1949	5”, 2 MHz
O-5	Oscilloscope	1950	5”, 2.2MHz
O-6	Oscilloscope	1950	5”, 200 kHz
O-7	Oscilloscope	1951	5”, 250 kHz
O-8	Oscilloscope	1951	5”, 2MHz
O-9	Oscilloscope	1951	5”, 3 MHz
O-10	Oscilloscope	1955	5”, 400 kHz, PC board
OL-1	Oscilloscope	1955	5”, 5 MHz
OM-1	Oscilloscope	1955	5”, 5 MHz
O-11	Oscilloscope	1957	5”, 5 MHz
OM-2	Oscilloscope	1957	5”
O-12	Oscilloscope	1958	5”, 5 MHz
OM-3	Oscilloscope	1958	5”, 1.2 MHz
OP-1	Oscilloscope	1958	2.2 MHz
OR-1	Oscilloscope	1959	5”, 200 kHz
IO-10	Oscilloscope	1960	3”, 200 kHz, recurrent sweep
IO-30	Oscilloscope	1960	5”, 5MHz
IO-21	Oscilloscope	1961	3”, 200 kHz
IO-12	Oscilloscope	1962	5”, 4MHz
EUW-25	Oscilloscope	1963	3”, 400 kHz
EV-3	Oscilloscope	1964	IMPScope biological EKG type
IO-14	Oscilloscope	1966	5”, 8MHz
EVW-3	Oscilloscope	1968	Assembled version of EV-3
IO-17	Oscilloscope	1968	3”, 5MHz
IO-18	Oscilloscope	1968	5”, 5MHz
EU-70	Oscilloscope	1970	15 MHz, dual trace, solid-state, assembled
IO-101	Vectorscope/Color Generator	1970	3” vectorscope and color bar/pattern generator
IO-102	Oscilloscope	1971	5”, 5MHz
IO-105	Oscilloscope	1971	5”, 15MHz, dual trace
IO-1128	Oscilloscope	1971	3”, vector monitor
IOW-18S	Oscilloscope	1971	Berkeley Physics Laboratory, 5” laboratory
IO-103	Oscilloscope	1972	5”, 10MHz
SO-29	Oscilloscope	1972	Biological, high gain DC
IO-104	Oscilloscope	1973	5”, 15MHz
IO-4510	Oscilloscope	1974	5”, 15 MHz, dual trace
SO-4510	Oscilloscope	1974	Assembled version of IO-4510
IO-4530	Oscilloscope	1975	5”, 10 MHz, TV Service
IO-4540	Oscilloscope	1975	5”, 5 MHz, hobby/service
IO-4560	Oscilloscope	1975	5”, 5 MHz, auto triggered sweep
SO-4530	Oscilloscope	1975	Assembled version of IO-4530
SO-4540	Oscilloscope	1975	Assembled version of IO-4540
IO-4550	Oscilloscope	1976	5”, 10 MHz, dual trace
SO-4550	Oscilloscope	1976	Assembled version of IO-4550
IO-4101	Oscilloscope	1977	Vectorscope like IO-101
IO-4541	Oscilloscope	1977	5”, 5 MHz, special TV triggering
IO-4555	Oscilloscope	1978	5”, 10 MHz
IO-4105	Oscilloscope	1979	5”, 5MHz
IO-4205	Oscilloscope	1979	5”, 5MHz, dual trace
IO-4235	Oscilloscope	1979	5”, 35 MHz, dual trace, delayed sweep
SO-4105	Oscilloscope	1979	Assembled version of IO-4105
SO-4205	Oscilloscope	1979	Assembled version of IO-4205
IO-3220	Oscilloscope	1982	5”, 20MHz, dual trace, battery powered
SO-3220	Oscilloscope	1982	Assembled version of IO-3220
IO-4360	Oscilloscope	1984	5”, 60 MHz, triple trace
SO-4221	Oscilloscope	1987	5”, 20 MHz, dual trace
SO-4226	Oscilloscope	1987	5”, 25 MHz, dual trace
SO-4521	Oscilloscope	1987	5”, 50 MHz, dual trace
SDS-5000	Oscilloscope	1988	Computer-based
ID-4850	Digital Memory Oscilloscope	1989	Digital memory box for scopes
IO-4210	Oscilloscope	1989	5”, 10MHz, dual trace
IO-4225	Oscilloscope	1989	5”, 25 MHz, dual trace
SO-4552	Oscilloscope	1989	5”, 25 MHz
SO-4554	Oscilloscope	1989	5”, 40 MHz

Fun With an Oscilloscope

I picked up a fun little toy this week, the SparkFun AVR Oscilloscope Clock. It displays an analog clock on an oscilloscope in X-Y mode. Here's an image of it driving my BK Precision oscilloscope:

It comes as a small pre-assembled board that just needs power and a connection to your 'scope.

It has a ton of different display options which can be controlled from small push buttons.

It packs a lot of features including optional connection to a GPS for time synchronization, control from a USB or serial port, and you can modify and reprogram it's firmware.

Here it is operating with my Heathkit IO-4205

An earlier version was sold as a kit, but unfortunately the latest design is only offered as an assembled product, due to the heavy use of surface mount components.

It can be a fun way to show off a spare oscilloscope you have lying around. It can even be useful as a piece of test equipment: it has a mode where it can act as a function generator and another where it can
operate as a serial port terminal.