Manufacturer: JACKSON (USA)
Model: CRO-3, S#30002
Vintage: 1964
Purpose: Wideband Oscilloscope
Condition: Working
Comments:
This is in an odd unit. First, I don't think it is a kit but it has the feeling of a prototype. The serial number 300002 may indicate this was #2 of the CRO-3 series. Based on the parts, this unit is original. It is working fine.
Taking the case off the chassis is somewhat strange. The screws left & right at bottom need to be removed and the handle at the top. The back panel is simply sliding into the case. The chassis has an I-beam design. Working on this unit conveniently requires a turn table or a lazy susan. Inside there is a ton of extra space. Some of the wiring and its guiding appears temporary (or an afterthought). There are extra holes in the case at the top to mount the handle. It seems someone made a mistake or a different handle mounting was originally planned. But the screws for the handle have to be in the same location than the nuts, fix mounted at the top of the chassis.
All this points to that the case was never opened. It takes more time to remove the case and put it back than it takes to read the manual. Even more interesting, the manual does not mention a word on how to get inside the scope, just strange.
I would be interested in pictures of other CRO-3 units to see if the chassis are the same.
Finally, the front connector for the probe for Y input has four pins. One is ground, one is 6.3Vac, one is the Y input and one is 260Vdc. Unfortunately I don't have the probe.
Model: CRO-3, S#30002
Vintage: 1964
Purpose: Wideband Oscilloscope
Condition: Working
Comments:
This is in an odd unit. First, I don't think it is a kit but it has the feeling of a prototype. The serial number 300002 may indicate this was #2 of the CRO-3 series. Based on the parts, this unit is original. It is working fine.
Taking the case off the chassis is somewhat strange. The screws left & right at bottom need to be removed and the handle at the top. The back panel is simply sliding into the case. The chassis has an I-beam design. Working on this unit conveniently requires a turn table or a lazy susan. Inside there is a ton of extra space. Some of the wiring and its guiding appears temporary (or an afterthought). There are extra holes in the case at the top to mount the handle. It seems someone made a mistake or a different handle mounting was originally planned. But the screws for the handle have to be in the same location than the nuts, fix mounted at the top of the chassis.
All this points to that the case was never opened. It takes more time to remove the case and put it back than it takes to read the manual. Even more interesting, the manual does not mention a word on how to get inside the scope, just strange.
I would be interested in pictures of other CRO-3 units to see if the chassis are the same.
Finally, the front connector for the probe for Y input has four pins. One is ground, one is 6.3Vac, one is the Y input and one is 260Vdc. Unfortunately I don't have the probe.
Documentation:
| jackson_cro-3_manual.pdf |