To enhance the quality of manufacturing as responsibility, build national brand of measurement!
To enhance the quality of manufacturing as responsibility, build national brand of measurement!
OneSummary
DT digital transmitter will put input voltage and current signal in the transmitter signal conditioning and high-speed sampling, the output of digital transmission through the optical fiber to the host computer. The PC software processing of digital signal can be extracted after various features of effective value, the measured signal fundamental harmonics and frequency values, but also through the correlation of the two channels are active power, reactive power, apparent power and harmonic power and other electrical parameters.
Due to the use of optical fiber transmission, DT digital transmitter can effectively avoid the loss and interference in the transmission process, and can meet the achieve of high precision measurement in complex electromagnetic environment.
DT series digital transmitter
TwoCharacteristic
1Front end digital, super EMC performance
The influence of electromagnetic interference on the measurement results is relative to the signal. High voltage, high current signal to allow greater interference, and low voltage, small current signal, more sensitive to interference. All active sensors (such as the Holzer sensor), has low output voltage (peak at + 15V or less), small current (less than 500mA), poor anti-interference ability, we must pay special attention to the influence on the accuracy of measurement of interference field. The digital transmitter module of DT adopts the digital technology of the front end, and the measured signal is digitized and transmitted through the optical fiber, so as to avoid the loss and interference of the transmission link, and ensure the accuracy of the measurement.
2High accuracy measurement in wide phrase, frequency and amplitude
◆ Each range DT digital transmitter set up 8 gears, each gear was measured in this shift range in the range of 50%~100% signal, to achieve high accuracy in the range of rated input in 0.5%~100%. Due to the use of seamless range conversion technology, gear switch, the data is not lost, can achieve the needs of a wide range of dynamic measurement.
◆ DT digital transmitter in 0.1Hz ~ 1500Hz frequency range, bandwidth in the range of 100kHz, which can achieve the nominal accuracy index, the electric power, frequency control, rail transportation, special power supply field of electric parameters measurement of bandwidth and accuracy requirements.
◆ DT digital transmitter voltage and current measurement are combined together to simplify the phase compensation circuit, improves the phase measurement accuracy of the phase range and improve the power measurement accuracy and achieve high accuracy measurement of low power factor.
3The same channel can be used to measure the analog and digital pulse signal
DT digital transmitter of each channel is quantified according to the analog signal at the same time, by setting the frequency of the filter can effectively extract any fundamental complex signal, and accurate measurement of the fundamental frequency, amplitude and frequency and bandwidth requirements and complete the same analog signal. Therefore, DT digital transmitter can analog signal digital pulse signal measurement in a wide range, so that it can be matched with various electrical or non sensors or analog output transmitter to achieve accurate measurement of electric parameters.
OneProduct application
DT digital transmitter channel can be configured flexibly, can be configured as half of the voltage channel and half of the current channel, can also be configured for all voltage channels or all the current channel. And the voltage or current channel range has a variety of options. In addition, the DT digital transmitter for each channel power in accordance with the analog and pulse frequency measurement in two ways simultaneously. This configuration makes the DT digital transmitter with a very flexible application:1.DT digital transmitter for power measurement, voltage channel can directly measure the voltage below 12KV, also can be connected with various voltage sensor output voltage or current output type; similarly, the current channel can directly measure the current below 120A, but also with various current output current or voltage output type sensor connected type. For example, different configuration and voltage transformer, current transformer, voltage sensor (Holzer output may be a voltage or current signal), Holzer (may be the current sensor output voltage or current signal), divider (output voltage signal), Rogowski coil (general output voltage signal of current and voltage etc.) power measurement sensor supporting higher and higher.
2.DT digital transmitter’s two channels are configured for voltage input, according to the Kirchhoff voltage law, can be used for three-phase voltage measurement.
3.DT digital transmitter’s two channels are configured for current input, according to Kirchhoff's current law, can be used for three-phase current measurement.
4.DT digital transmitter’s two channels with the same configuration, the use of micro differential measurement method for various sensors for high-precision verification / calibration.
5.Wide range of measurement capabilities and a wide range of optional, so that the DT digital transmitter can be connected with any amount of electricity or non electricity sensor measurement. For example, the use of its dual channel characteristics, can be a channel to connect the thermocouple output, the other channel connected to the cold end of the thermocouple compensation output, to achieve accurate measurement of thermocouple.
6.The measurement of the pulse frequency of the DT digital transmitter makes it possible to measure the time and frequency signals with various pulse frequency output sensors. For example, with a torque sensor, a channel is used to measure torque, a channel for measuring speed.
TwoNaming rules
DT is divided into four types: dual channels, 4 channels, 6 channels, 8 channels and 16 channels.
Naming rules for dual channel DT digital transmitter
Taking DT215B digital transmitter as an example:
◆ DT: digital transmitter identifierDT215B digital transmitter suffix letter B, accuracy of 0.1%rd.
Multi-channels DT digital transmitter naming rules
The multi-channels digital transmitter is four numbers, and the number of channel information is added to the dual channel digital transmitter. The first number represents the total number of channels, the second number represents the channel property, the third number represents the first half of the channel range, the fourth number represents the second half of the channel range.
chart1、DT digital transmitter voltage range information representation method
| Digital identification | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| voltage range | 5V～1200V | 0.5V～120V | 0.1V～25V | 50mV～10V | 5mV～1V | 1mV～250mV | 50V～12KV | 40V～8KV | 20V～4KV |
chart2、DT digital transmitter current range information representation method
| Digital identification | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Current range | 0.5A～120A | 300mA～60A | 150mA～30A | 80mA～16A | 20mA～6A | 4mA～1.2A | 2.5mA～500mA | 500uA～100mA | 100uA～25mA |
DT series digital transmitter online selection tool
ThreeRecommended applications
◆ 5V～1200V：The voltage below 1200V can be measured directly, which can achieve the measurement of voltage transformer
◆ 0.5V～120V：Measurement of voltage transformer
◆ 0.1V～25V：Measurement of active sensors with various voltage output types
◆ 1mV～250mV：With the shunts, thermocouples and other supporting measure
◆ 4mA～1.2A：The utility model is mainly used for the measurement of the current mutual inductor and various current output sensors
◆ 0.5A～120A：Mainly used for direct current measurement below 120A
◆ 20mA～6A：The utility model is mainly used for the measurement of the current transformer
◆ 4mA～1.2A：Mainly used for 4 ~ 20mA and a variety of current output active sensor matching measurement
◆ 100uA～25mA：Mainly used for small current and 4 ~ 20mA measurement
FourType parameter
| Model | Function and technical index | Appearance drawing |
| DT111 A/B | Dual channel voltage measurement Accuracy ：0.05% / 0.1%rd Voltage range：5V~1200V Frequency range DC，0.1Hz~1500Hz |
 |
| DT122 A/B | Dual channel voltage measurement Accuracy：0.05% / 0.1%rd Voltage range：0.5V~120V Frequency range DC，0.1Hz~1500Hz |
 |
| DT211 A/B | First channel: voltage measurement Second channel: current measurement Accuracy：0.05% / 0.1%rd Voltage range：5V~1200V Current range：0.5A~120A Frequency range DC，0.1Hz~1500Hz |
 |
| DT215 A/B | First channel: voltage measurement Second channel: current measurement Accuracy ：0.05% / 0.1%rd Voltage range：5V~1200V Current range：20mA~6A Frequency range DC，0.1Hz~1500Hz |
 |
| DT236 A/B | First channel: voltage measurement Second channel: current measurement Accuracy ：0.05% / 0.1%rd Voltage range ：0.1V~25V Current range：4mA~1.2A Frequency range DC，0.1Hz~1500Hz |
 |
| DT355 A/B | First channel:Current range Second channel: current measurement Accuracy ：0.05% / 0.1%rd Current range：20mA~6A Frequency range DC，0.1Hz~1500Hz |
 |
| DT399 A/B | First channel:Current range Second channel: current measurement Accuracy：0.05% / 0.1%rd Current range：100uA~25mA Frequency range DC，0.1Hz~1500Hz |
 |
OneAnalog measurement technique index
Analog measurement technique index
Bandwidth: 100kHz
Sampling frequency: 250kHz
Accuracy: level 0.05 or level 0.1
Voltage measurement range: different models can cover 1mV ~ 12KV AC and DC voltage
Current measurement range: different models can cover 100uA ~ 120A AC and DC current
TwoTechnical index of pulse measurement
Frequency: 0.1Hz ~ 50kHz
Amplitude: analog input range
Waveform: combined with the cut-off frequency can be set up by the frequency filter, can measure the fundamental frequency of any signal.
Because of the characteristics of DT digital transmitter, which can be directly used for measuring electrical parameters of various 12KV/120A, but also with a thermocouple, flow, pressure, displacement, speed, torque, vibration sensor or other type of analog output transmitter supporting the use of various non electrical signal measurement.
ThreeTechnical specifications for power measurement
| project | index | conditions |
| maximum sampling rate | 250kHz | |
| -3dbbandwidth | 100kHz | |
| voltage |
A type：0.05%rd B type：0.1%rd |
amplitude： 0.5%~100% UN； fundamental frequency：DC，0.1Hz~1500Hz |
| current |
A type：0.05%rd B type：0.1%rd |
amplitude： 0.5%~100% IN； fundamental frequency：DC，0.1Hz~1500Hz |
| power |
A type：0.05%rd B type：0.1%rd |
power factor=1；rated voltage、rated current； fundamental frequency：45~66Hz |
|
A type：0.1%rd B type：0.2%rd |
power factor：0.2~1； fundamental frequency：DC，0.1Hz~1500Hz |
|
|
A type：0.2%rd B type：0.5%rd |
power factor：0.05~0.2； fundamental frequency：DC，0.1Hz~1500Hz |
|
| frequency measurement accuracy | 0.02%rd | 0.1Hz~1500Hz |
| isolation voltage | 2UN+1000V |
China's leading enterprise in variable frequency power measurement and metering
National variable frequency power measuring instrument (metering station) founder
Research and development unit of national variable frequency power metering standard