Find out the situation in your power supplying chain with this sophisticated precision measuring device.

Connect it with your headphones

Hear the noise provided by your power net to your system and degrading it.

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You will hear nothing anymore.

The power supplied to your system is absolutely clean.

This instrument will help you step by step to find and eliminate the weak points in your power supplying chain in this way improving sound quality of system in terms of clarity, space field, positioning, distortion and so forth drastically.

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The influence of AC quality over audio-video equipment is very similar to that of drinking water over human health in relationship. Stable, accurate, as well as pure and non-contaminated power voltage is a very important condition for audio-video equipment and apparatus to fully play their functions at original designed due level.

In governmental standard “GB/T14549-1993”, the upper-limit value for harmonic wave (distortion) of voltage in low-tension public power grid is 5%, and power supply in low-tension terminal (single phase 220V/three phase 380V) of public power grid belongs to “rough power” in the eyes of experts on electric power. Under the situation when load of power consumption is compacted and complicated, the actual situation will also very often exceed the international allowance. Grievous harmonic wave and noise interference can frequently lead the music played by Hi-end apparatus with preeminent performance and strong resolving power to be put to shame intermingled with noise. DC component generated by asymmetrical AC waveform will also very often lead to noise of vibrations with low IR transformer of large-power Hi-end amplifiers due to DC bias, and in a tranquil environment, the noise of vibration with transformer may no doubt cause most details in music to be relentlessly submerged. The universal influence of AC quality over top-grade audio-video apparatus has become a trouble for a long time in the mind of A-V fanciers.

Private power users normally cannot order high-quality power energy from power supply departments like high-standard enterprise users, however, forward-looking senior players have long before begun using shielded high-level power leads, electric wave filters, isolation transformers, and even high-performance power processors, to improve the AC quality of AV equipments.

Measurements have proved that AC processed with high-level power processing devices can not only ensure a voltage stability and accuracy of circuits, but also minimize the voltage harmonic wave and interference noise to below 0.5% and eliminate DC components, while providing apparatus with high-quality AC is no doubt an important guarantee for safe operation, extension in service life, and improvement of AV replaying quality of AV apparatus.

General

CT-1 is a portable measurement device specially used for detecting single-phase AC quality, and it can be easily used to observe voltage harmonic wave and interference noise (THD+N) as well as the size of and the change along with time in DC weight arising from asymmetrical waveforms of circuit voltage. Through measurement without interruption, CT-1 can also enable the observers to see the status on changes in AC quality in different time periods of a day (This is a strong proof to reveal that the sound quality at midnight is obviously better than that in the peak power consumption period of dusk.), and to listen to music by avoiding the period of high power pollution. 

By using CT-1, AV fanciers can easily find the problems with AC quality and solve them by selecting and using proper power processing devices, so that the existing apparatus can again show their original satisfactory performances.

The values of voltage harmonic waves and interference noises (THD+N) measured by CT-1 can also be sent to the driven earphone or the monitoring port connected with oscillograph and other devices in addition to pointer indication, for direct monitoring of the relative sizes of harmonic wave and interference noise components or for further observation and measurement analysis with oscillograph.

The indication value (full scale) of CT-1 for measurement of voltage harmonic wave and interference is ranged at 5%, corresponding to the value of allowance in governmental standard, and when THD+N exceeds 5%, the meter pointer will be offset beyond the reading range, to show that AC quality has grievously deteriorated.

In addition to precision reading, the measurement value of CT-1 can also be rapidly and visually used in different color zones of meter to represent degrees of impact from AC quality on AV apparatus. When DC weight is measured, the transformer of audio equipment is normally quiet if pointer is located inside the green zone, while the pointer is turned to the red zone, the noise of vibrations with most large-power IR transformers reaches to an easily audible degree. Therefore when users of apparatus find noise of vibration exists with the apparatus, CT-1 can help the owner of the apparatus easily determine whether or not the noise is initiated by DC in the power supply. 

CT-1 can also be used to detect and sense the sources of noises in the power circuit, or to compare the status on changes in AC quality before and after processing by power processing devices.

High-sensitivity CT-1 can measure the lowest readable value of THD+N as low as 0.5%, and its measurement resolving power for DC weight can reach 20mV. Rational and precision functional design and the method for representation of AC quality by different color zones have enabled the measurement of AC quality by CT-1 to be very simple and visual.

CT-1 can help AV fanciers to find problems with AC quality, select and use power processing devices, and verify their reachable actual efficacies based on scientific measurements.

To maximize the performance of Hi-end systems, it is an extremely important basic condition to ensure an accurate voltage and a pure waveform, and CT-1 no doubt is a top-choice tool necessary for AV fever friends to test AC quality.

The power consumption of CT-1 itself is extremely low (smaller than 1W), can serve as a perennial device for continuous use always in synchronized operation with AV apparatus, so that you can readily know about the changes in original AC quality and whether or not power processing devices are operating under normal condition.

When CT-1 is put into synchronized use (in the common frequency of urban power supply) with power processing devices with known smaller THD+N, it is also able to indirectly monitor as to whether or not the frequency drift of AC frequency (50Hz) is larger than the international lowest allowance of 0.5Hz through judging whether or not the indication value for measurement of THD+N is offset beyond the normal reading range.

Operating

Preheating prior to Measurement

It takes about 2 minutes for preheating from startup of CT-1 to design measurement precision. After connecting the power lead attached with CT-1 respectively with the mainframe of CT-1 and the AC power socket to be measured, please be patient to wait to read the precise and stable measurement result after preheating time is completed.

Measurement of Harmonic Wave and Noise of Power Supply

Dial the measurement select switch upward to the position of “THD+N”, and at this point the meter will indicate the “THD+N” value for harmonic wave and noise of power supply. The smaller the indication value is, the more pure the power supply is indicated.

“THD+N” indication value of CT-1 takes 5% as the full scale. The indication value of meter is a linear scale. The green zone corresponds to “THD+N” value smaller than 1%, and when pointer is located inside the green zone, the quality of power supply no doubt belongs to good quality level. The unprocessed original power energy can often have a “THD+N” value up to more than 3%.

The “THD+N” value indicated by CT-1 may vary in different time periods of a day along with the change in loads on the same circuit and different situations of interference. Under normal condition, “THD+N” should be a relatively stable indication value. If the measurement value rises and falls frequently within a short time period or the pointer is offset beyond the full scale, it indicates that there exists serious interference in the power supply or the distortion of circuit voltage has reached the degree which may seriously affect normal use of electronic device. Under such situation, if power is not effectively processed, while directly supplied to high-level a-v apparatus, not only a pure audio quality or video frame is not ensured, but it will also be very disadvantageous to the security and service life of apparatus, which shall be avoided as much as possible. 

DC Weight Measurement

Dial the measurement select switch downward to “DC” position, and at this point the indication value of meter shall correspond to DC weight arising from asymmetry in positive and negative half wave in AC to be measured. The “DC” indication value of CT-1 takes 200mY as full scale, and the indication value of meter is a linear scale. The green zone corresponds to 0-20mV, regardless that few large power transformers under the 10mV DC weight may also possibly generate audible noise of vibration, but most power transformers with good quality will not affect normal listening for their noise of vibrations given out when pointer is located inside the green zone.

Monitoring on Harmonic Wave and Noise of Power Supply

“THD+N” indicated by CT-1 meter is a mixed value of harmonic wave and noise of interference. When it is needed to further recognize their respective contents or to observe their respective components, earphone can be inserted into monitoring port or the signal output from monitoring port can be directly sent to Y-axle port of oscillograph. The built-in potentiometer for electric level adjustment can be regulated to monitor the range of signal output from monitoring port. Regulation of this potentiometer produces no influence on indication value of meter.

Technical Data

Power Supply:

AC 220 V  ± 10%

Operating Frequency

50 ± 0.5 Hz

Distortion + Noise  Range of Measurement:

0 ~ 5%

DC Weight  Range of Measurement:

0 ~200mV

Dimensions (W x H x D):

153 x 46 x 175

Weight:

0.95 kg