Manufacturer:  | Hunter |
Model:  | 120A KLOCKOUNTER |
Year:  | 1967 |
Schematic:  | RE |
| |
Max. Rate:  | 5 KHz |
Display:  | dekatron |
Digits:  | 4 |
Logic:  | tube |
|
A small timer and event counter.
The timebase is a small synchronous motor spinning a disc with holes in it,
and an optical sensor.
Does not measure frequency directly as there is no gate control.
The 6802 dekatron tubes are specified to a maximum rate of 5KHz,
by simple visual observation the counter appears to function up to around 6 KHz.
The photo exposure shows the unit actively counting.
The LSD (digit at bottom) has passed through zero,
the consequent carry resulting in the increment of the digit above.
- Unit Log -
Serial Number:  | (none) |
Year of Manufacture:  | 1967 (Capacitors stamped with 6708, 6716). |
Other Identification:  | Series D |
Date of Receipt:  | 1997 Aug |
State upon Receipt:  | Clean, functional.
Unit had been modified slightly with a relay and some simple controlling circuitry installed. |
Date:  | 1997 Aug 18 |
Procedure:  | Modifications removed. |
Date:  | 1997 Aug 18 |
Procedure:  | Line cord replaced. |