SU913283A1 - Device for testing radio-frequency coaxial cable - Google Patents

Description

The invention relates to electrical measurements and can be used to test radio frequency coaxial cables with maximum permissible energy levels.

The closest technical entity is a device for testing high-power RF coaxial cables, containing a unit for establishing a test mode in a cable, a unit containing a powerful radio-frequency generator and control and measuring elements, a temperature sensor, for example, on a thermistor, connected to an indicator (1] .

A disadvantage of this device is its low reliability due to the danger of breakdown through the connecting wires of the sensor or the wall of the hole, limited functionality, since it cannot be used at voltages

2

above 200-500 V, and due to the manifestation of capacitive inhomogeneity - and at frequencies above 2-3 MHz.

The aim of the invention is to improve the reliability and enhanced functionality.

This goal is achieved in that the device for testing a radio frequency coaxial cable containing a power supply, the output of which is connected to one of the terminals of the test cable, the other output of which is connected to the load, a microphone located on the test cable and connected through the signal amplifier to the input temperature indicator, a vibration sensor is inserted, the vibration sensor is placed inside

_{m of the} test cable and is made in the form of a clock mechanism with a spring

factory and balance split rim

'which is made of double layer, and

linear expansion coefficients

3 913283

materials inner and outer layers correspond to the ratio:

> 1.5,

where - the coefficient of linear expansion of the material of the inner layer of the rim of the split; coefficient of linear expansion of the material outer ¹⁰

, layer of rim rim.

FIG. 1 drawing is presented

block diagram of a device for testing radio frequency coaxial cable; in fig. 2 - oscillation of the sensor circuit ^{15-oscillations.}

The apparatus comprises a power supply 1 connected via cable 2 to the test load 3, the oscillation sensor 4 arranged in the channel 5 intra rennego conductor ²⁰ of the cable 6, test 2, a microphone 7, a temperature indicator 8, amplifier 9.

The vibration sensor 4 contains a spring engine 10, a gear ²⁵ gear 11, a trigger mechanism 12, a spiral 13, a balance 14 with a rim 15 consisting of an outer layer 16 and an inner layer 17. Moreover, the coefficients of linear expansion of the material - ³⁰ 1 inner and outer layers to the ratio

Tl

P

7,

1.5,

35

where - the coefficient of linear expansion of the material of the inner layer of the rim of the split;

* coefficient of linear expansion of the material of the outer ⁴⁰ layer of the rim rim.

The device works as follows.

In the channel 5 of the inner conductor 6 of the cable 2 is placed sensor 4, included ⁴⁵ chaetsya power supply T, and in accordance with a certain mode is set test load 3 Hariza posal.

Include the chain; microphone 7 ~ amplification ⁵⁰ ”9“ indicator 8. As the temperature increases, the rim sections 15 of the balance 14 are bent further away from the balance axis, its moment of inertia increases, i.e. contributes to the change in the frequency of sounding the sound signals in the same direction (reduces it) as the temperature change in the elasticity of the spiral4

li 13. When the temperature decreases, vice versa. This achieves an unambiguous and almost linear inverse dependence of the pulse repetition rate on temperature, approximately equal to 0.03% per degree.

After establishing the thermal conditions in cable 2, indicator 8 determines the temperature of the inner conductor 6 and compares it with the maximum allowable.

This device allows you to reliably determine the attenuation coefficient in the operating mode and long-term permissible current, as well as the voltage, power and time constants of heating and cooling of the cable.

Claims (1)

Claim A device for testing a radio frequency coaxial cable containing a power supply, the output of which is connected to one of the terminals of the test cable, the other output of which is connected to the load, a microphone placed on the cable under test and connected via a signal amplifier to the temperature indicator input, characterized in that in order to increase reliability and expand functionality, a vibration sensor is inserted into it, the vibration sensor being placed inside the cable under test and made in the form of a clock mechanism with springs The main plant and balance, the split rim of which is made two-layer, and the linear expansion coefficients of the materials of the inner and outer layers correspond to the ratio Tl 7.1,5 where - the coefficient of linear expansion of the material of the inner layer of the rim of the split; coefficient of linear expansion of the material of the outer layer of the rim rim.