Cam switches: Difference between revisions
No edit summary |
No edit summary |
||
| Line 12: | Line 12: | ||
* [http://hakanh.com/dl/docs/kitinstructions/040-0541-00.pdf 040-0541-00: Cam switch repair kit (1970)] | * [http://hakanh.com/dl/docs/kitinstructions/040-0541-00.pdf 040-0541-00: Cam switch repair kit (1970)] | ||
* [[Media:Tekscope 1977 V9 N1.pdf | TekScope Vol. 9 No. 1, 1977]] p.14: Cam switch cleaning tips | * [[Media:Tekscope 1977 V9 N1.pdf | TekScope Vol. 9 No. 1, 1977]] p.14: Cam switch cleaning tips | ||
* [[Media:Tek cam switch repair manual.pdf]] | * [[Media:Tek cam switch repair manual.pdf|Tektronix cam switch repair manual]] | ||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 7a19 frontright.jpg | Cam switch in [[7A19]] | Tek 7a19 frontright.jpg | Cam switch in [[7A19]] | ||
Tek 7a19 rearright.jpg | Cam switch in [[7A19]] | Tek 7a19 rearright.jpg | Cam switch in [[7A19]] | ||
Tek 7a19 att sw3.jpg | Cam switch in [[7A19]], contact fingers (isolated from spring lever) | Tek 7a19 att sw3.jpg | Cam switch in [[7A19]], contact fingers (isolated from spring lever) | ||
Cam-01.jpg | Cam switch with contacts on both sides of the PCB ([[7D15]]) | Cam-01.jpg | Cam switch with contacts on both sides of the PCB ([[7D15]]) | ||
Cam-02.jpg | 7D15 double-sided switch | Cam-02.jpg | 7D15 double-sided switch | ||
Revision as of 12:46, 4 March 2022
Cam switches are used in many Tek instruments, particularly in 7000-series plug-ins, but also in TM500 equipment and 400-series portable scopes.
The lobes on the rotary cam encode the lookup table of which contacts should be open or closed in each rotational position of the shaft, which is typically rotated by a knob on the front panel of the instrument. A benefit of this design is low parasitics compared to traditional rotary wafer switches.
For cleaning, Tek recommends swiping paper soaked in isopropyl alcohol between the contacts and pads.
Ken Holland was involved with the development of cam switches at Tek.
Maintenance
- 040-0541-00: Cam switch repair kit (1970)
- TekScope Vol. 9 No. 1, 1977 p.14: Cam switch cleaning tips
- Tektronix cam switch repair manual
Pictures
-
Cam switch in 7A19
-
Cam switch in 7A19
-
Cam switch in 7A19, contact fingers (isolated from spring lever)
-
Cam switch with contacts on both sides of the PCB (7D15)
-
7D15 double-sided switch
-
7D15 double-sided switch
-
7D15 double-sided switch, bottom-side contacts
-
7D15 double-sided switch, through-board pins
-
