公开(公告)号：US4020416A

公开(公告)日：1977-04-26

申请号：US688475

申请日：1976-05-20

Applicant: James Gunard Ottos

Inventor： James Gunard Ottos

IPC: H01J9/42 ,  G01R27/02 ,  G01R27/14 ,  H01J9/08

CPC classification number: G01R27/14

Abstract: A constant current is applied through a heater by means of an electrical connector which mates with terminal pins of the tube. The applied current causes a voltage across the heater. A first voltage measurement is made across the heater at a first time. After a predetermined time interval has elapsed, a second voltage measurement is made across the heater. The value of the first voltage measurement is substracted from the value of the second voltage measurement and the value of the difference obtained is compared with a predetermined reference value. If the difference value is less than the reference value, a first nominal value of heater resistance is indicated. If the difference value is greater than the reference value, a second nominal value is indicated. The nominal heater resistance values are detected independent of the electrical connector contact resistance.

Abstract translation: 通过与管的端子引脚相配合的电连接器通过加热器施加恒定电流。 所施加的电流导致加热器两端的电压。 第一次在加热器上进行第一次电压测量。 在经过预定时间间隔之后，跨加热器进行第二电压测量。 将第一电压测量的值从第二电压测量的值减去，并将获得的差值与预定的参考值进行比较。 如果差值小于参考值，则表示加热器电阻的第一标称值。 如果差值大于参考值，则指示第二标称值。 独立于电气连接器接触电阻检测额定加热器电阻值。