GB1104653A - Improvements in or relating to electrical testing apparatus - Google Patents
Improvements in or relating to electrical testing apparatusInfo
- Publication number
- GB1104653A GB1104653A GB2949565A GB2949565A GB1104653A GB 1104653 A GB1104653 A GB 1104653A GB 2949565 A GB2949565 A GB 2949565A GB 2949565 A GB2949565 A GB 2949565A GB 1104653 A GB1104653 A GB 1104653A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terminal
- lamp
- potential
- transistors
- bias
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
1,104,653. Test circuits. NEWALL ENGINEERING CO. Ltd. J.H. Phillips and K. Barraclough. June 30, 1966 [July 12, 1965], No. 29495/65. Heading G1U. [Also in Division H3] A test circuit, Fig. 1, comprises two triode indicator lamps 17, 18 connected as a long-tailed pair to a common cathode resistance 22. With no input applied to terminal 28, transistors 35, 37 are conducting and the potential at the collector of transistor 37 holds both lamps cut-off. Application of earth potential at terminal 28 switches off both transistors and the change in potential across the long tailed pair resistor 22 allows lamp 23 to switch on, lamp 24 being held off by the bias on its grid. Application to terminal 28 of a negative potential of greater magnitude than the bias on lamp 24 still switches off the transistors, but in this case lamp 24 lights. The circuit may be modified for positive inputs at terminal 28, and the elements may be mounted in a test probe, Fig. 2 (not shown) used in testing a mimic diagram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2949565A GB1104653A (en) | 1965-07-12 | 1965-07-12 | Improvements in or relating to electrical testing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2949565A GB1104653A (en) | 1965-07-12 | 1965-07-12 | Improvements in or relating to electrical testing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1104653A true GB1104653A (en) | 1968-02-28 |
Family
ID=10292461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2949565A Expired GB1104653A (en) | 1965-07-12 | 1965-07-12 | Improvements in or relating to electrical testing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1104653A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128344A (en) * | 1982-09-30 | 1984-04-26 | Ford Motor Co | Voltage sensor device |
| US6223512B1 (en) | 1996-09-13 | 2001-05-01 | W. Schlafhorst Ag & Co. | Pot spinning device |
-
1965
- 1965-07-12 GB GB2949565A patent/GB1104653A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128344A (en) * | 1982-09-30 | 1984-04-26 | Ford Motor Co | Voltage sensor device |
| US4634971A (en) * | 1982-09-30 | 1987-01-06 | Ford Motor Company | Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage |
| US6223512B1 (en) | 1996-09-13 | 2001-05-01 | W. Schlafhorst Ag & Co. | Pot spinning device |
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