GB1275079A - Improvements in or relating to measuring instruments - Google Patents
Improvements in or relating to measuring instrumentsInfo
- Publication number
- GB1275079A GB1275079A GB3873169A GB3873169A GB1275079A GB 1275079 A GB1275079 A GB 1275079A GB 3873169 A GB3873169 A GB 3873169A GB 3873169 A GB3873169 A GB 3873169A GB 1275079 A GB1275079 A GB 1275079A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sine wave
- phase difference
- circuit
- frequency
- resonant
- 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
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
1275079 Measuring resonant frequency STANDARD TELEPHONES & CABLES Ltd 29 July 1970 [1 Aug 1969] 38731/69 Heading G1U In order to compare the resonant frequency of a resonant circuit 1, Fig. 1, with the frequency of a sine wave alternating current, the circuit is connected in series with a resistor 2, the sine wave is applied across the series connection, and the phase of the potential across the circuit is compared with the phase of the sine wave, as described the phase difference is determined by producing pulses whose widths correspond to the phase difference, and using these pulses to charge a capacitor, which is reset at the end of every cycle, so that its average potential, which may be displayed on a logarithmically graduated meter, corresponds to the required phase difference. The arrangement can be used when tuning the resonant circuit: the sine wave is set to the desired frequency and the resonant circuit adjusted until there is no phase difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3873169A GB1275079A (en) | 1969-08-01 | 1969-08-01 | Improvements in or relating to measuring instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3873169A GB1275079A (en) | 1969-08-01 | 1969-08-01 | Improvements in or relating to measuring instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1275079A true GB1275079A (en) | 1972-05-24 |
Family
ID=10405347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3873169A Expired GB1275079A (en) | 1969-08-01 | 1969-08-01 | Improvements in or relating to measuring instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1275079A (en) |
-
1969
- 1969-08-01 GB GB3873169A patent/GB1275079A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |