GB723125A - Improvements in apparatus for testing high frequency electric circuits - Google Patents
Improvements in apparatus for testing high frequency electric circuitsInfo
- Publication number
- GB723125A GB723125A GB6005253A GB6005253A GB723125A GB 723125 A GB723125 A GB 723125A GB 6005253 A GB6005253 A GB 6005253A GB 6005253 A GB6005253 A GB 6005253A GB 723125 A GB723125 A GB 723125A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- pulse
- cathode
- network
- under test
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
723,125. Electrical pulse-echo testing systems. BRITISH INSULATED CALLENDER'S CABLES, Ltd. Jan. 7, 1953 [Jan. 8, 1952], No. 600/52. Class 40 (7). Relates to pulse-echo apparatus for detecting impedance discontinuities in transmission lines in which the line under test is coupled via a connecter cable 10, Fig. 4 (not shown), to a pulse generator 1 and to the grid of an amplifier 12 whose output is applied to an indicator 21 via a further high-gain amplifier 20, a balancing network having similar impedance characteristics to the line under test being coupled via a connecter cable 13 (of equal length to cable 10) to the pulse generator and to the cathode of amplifier 12 so that the direct pulse is substantially balanced out in amplifier 12 to avoid overloading amplifier 20, the echo pulses only being displayed on the indicator. According to the present invention the balancing network is coupled to the cathode of amplifier 12 via a cathode follower 15 and the pulse generator 1 is coupled to the line under test and to the balancing network via cathode followers 4 and 5 or via separate impedances, Fig. 2 (not shown) one of said impedances on the bias on one of said cathode followers (5, as shown) being adjustable to facilitate the balancing. In a modification, Fig. 3 (not shown), the separate valves 12 and 15 are replaced by a double triode. When setting up the apparatus, the gain of amplifier 20 is reduced and the direct pulse balanced out by adjusting the impedance of the balancing network; if this network is calibrated this adjustment gives the approximate impedance of the line under test. The gain of amplifier 20 is then increased and any residual pulse is balanced out by adjusting the cathode follower resistance 9 and possibly the balancing network. The resistance 9 and the network may be adjusted in a similar manner to prevent amplifier 20 being overloaded by a large amplitude echo.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE516474D BE516474A (en) | 1953-01-07 | ||
FR1072535D FR1072535A (en) | 1953-01-07 | 1952-12-17 | High Frequency Electrical Circuit Tester Improvements |
GB6005253A GB723125A (en) | 1953-01-07 | 1953-01-07 | Improvements in apparatus for testing high frequency electric circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6005253A GB723125A (en) | 1953-01-07 | 1953-01-07 | Improvements in apparatus for testing high frequency electric circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB723125A true GB723125A (en) | 1955-02-02 |
Family
ID=10484907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6005253A Expired GB723125A (en) | 1953-01-07 | 1953-01-07 | Improvements in apparatus for testing high frequency electric circuits |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE516474A (en) |
FR (1) | FR1072535A (en) |
GB (1) | GB723125A (en) |
-
0
- BE BE516474D patent/BE516474A/xx unknown
-
1952
- 1952-12-17 FR FR1072535D patent/FR1072535A/en not_active Expired
-
1953
- 1953-01-07 GB GB6005253A patent/GB723125A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1072535A (en) | 1954-09-14 |
BE516474A (en) |
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