Delay relay: Difference between revisions

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A main relay that switches the anode voltages is controlled by a '''thermal delay relay''' such as the 6N045 or 6N030 which is housed in a miniature 9-pin glass tube enclosure.   
A main relay that switches the anode voltages is controlled by a '''thermal delay relay''' such as the 6N045 or 6N030 which is housed in a miniature 9-pin glass tube enclosure.   


When the scope is turned on, a bi-metal strip in the delay relay is beginning to heat up.  After the delay time (30 to 60 seconds depending on instrument), the bi-metal strip closes a contact that energizes the main relay.  One of the main relay's contacts is used to make it self-holding while at the same time cutting out the delay relay, which is beginning to cool so it will be ready to provide delaying turn-on again in the event of a power outage.
When the scope is turned on, a bi-metal strip in the delay relay is beginning to heat up.  After the delay time (30 to 60 seconds depending on the instrument), the bi-metal strip closes a contact that energizes the main relay.  One of the main relay's contacts is used to make it self-holding while at the same time cutting out the delay relay, which is beginning to cool so it will be ready to provide delaying turn-on again in the event of a power outage.


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Revision as of 05:18, 3 September 2018

Several tube-era Tektronix oscilloscopes such as the 549, 581 and 585 contain a circuit that delays turn-on of the main supply voltages until the tubes are warmed up.

A main relay that switches the anode voltages is controlled by a thermal delay relay such as the 6N045 or 6N030 which is housed in a miniature 9-pin glass tube enclosure.

When the scope is turned on, a bi-metal strip in the delay relay is beginning to heat up. After the delay time (30 to 60 seconds depending on the instrument), the bi-metal strip closes a contact that energizes the main relay. One of the main relay's contacts is used to make it self-holding while at the same time cutting out the delay relay, which is beginning to cool so it will be ready to provide delaying turn-on again in the event of a power outage.