TH0500
TUNKIA
| Availability: | |
|---|---|

1. Summary
The TH0500 is a series of precision current conversion standards that utilize high-precision DC current comparator technology. They convert nominal DC/AC currents ranging from 0.1 A to 20 kA into proportionally smaller voltage or current signals while maintaining a high level of ratio accuracy. By connecting the secondary output to appropriate measuring instruments, a wide variety of measurement applications can be achieved.
2. Features
• Primary current input supports both direct input and through-core connection.
Direct input nominal range: 0.1 A … 200 A.
Through-core nominal range: 500 A … 20 kA.
• Secondary output signal can be configured as either current-mode (I/I) or voltage-mode (I/V).
I/I type: Best proportional uncertainty reaches 2 ppm.
I/V type: Best proportional uncertainty reaches 10 ppm.
• Measurement Frequency: DC ~ 5 kHz
3. Application
• Establish DC / AC current precision measurement system
• Calibration of DC / AC current source or ammeter
• Calibration of DC current ratio standard (current comparator)
• Calibration of DC current transformer / sensor
• Calibration of DC I/V conversion standards
☆ Flexible Current Access and Signal Output Mode |
|
The current input supports two connection methods: direct connection and through-core connection. • Direct Connection: Utilizes standard current terminals, suitable for measuring smaller currents with a nominal input range of 0.1 A to 200 A. • Through-Core Connection: Features an aperture designed for easy threading of large-gauge conductors, suitable for measuring high currents with a nominal input range of 500 A to 20 kA. |
The secondary output signal can be selected as either voltage type or current type. • Voltage Output (I/V Type): Provides a nominal output of 1 V, facilitating connection to precision voltmeters for current conversion and measurement. • Current Output (I/I Type): Provides a nominal output range of 0.1 A to 5 A. It is suitable for calibrating DC ratio standards (current comparators), DC I/V conversion standards, DC current transformers, and for extending the current range of DC power meters. |
3.1 Application of TH0500 I/V Type
☆ Establish Current Precision Measurement System |
|
• Users can establish a precision current measurement system by combining the TH0530, a precision voltmeter, and a stable current source. • This setup enables precision measurement of high currents or provides accurate, stable DC/AC current signals for test devices or loads. |
☆ Calibrate High Current Source / Meter |
|
• Another typical application of the type I / V transform is paired with a precision voltmeter to calibrate the AC high current standard source / meter. |
☆ Calibrate I/V Conversion Standards |
|
• Using the I/V type TH0500, you can calibrate the DC shunt, current transducer and other I/ V transform devices in the following two methods. • Calibration by difference method: The selected TH0500 is in the same proportion as the tested I/V, and a micro voltmeter such as a nanovoltmeter is used for calibration • Calibration by voltage ratio method: The selected TH0500 is not proportional to the tested I / V and is calibrated using a voltage ratio measurement device. (Note: For the calibration of type I /I conversion standard such as current comparator and DC current transformer, type I/ I TH0500 is recommended as the standard; the secondary series standard resistance being tested I / I is also used as described in the method above figure.) |
3.2 Application of TH0500 I/I Type
☆Calibrate I/I Conversion Standards |
|
• I/I type TH0500 can be used to calibrate DC current comparator, current transformer and other I/I conversion equipment according to the following two methods. • Calibration by difference method: the selected TH0500 is in the same proportion as the tested I/I μA micro ammeter for calibration. • Calibration by current ratio method: TH0500 selected is not in the same proportion as the tested I/I, and the current ratio measuring device is used for calibration |
☆ Establish High Voltage and High Current Power/ Energy Precision Measurement System |
|
• The TH0530 can be paired with high-voltage V/V conversion equipment (typically such as the TH0170 Precision DC Voltage Divider) and standard power/energy meters (typically such as the TH1300 AC/DC Power and Energy Measurement Standard) to form a high-voltage, high-current power/energy precision measurement system. • This system is used for measuring the output power of high-power sources, the efficiency of conversion equipment, and for calibrating high-current power sources, power meters, and other devices. |

1. Summary
The TH0500 is a series of precision current conversion standards that utilize high-precision DC current comparator technology. They convert nominal DC/AC currents ranging from 0.1 A to 20 kA into proportionally smaller voltage or current signals while maintaining a high level of ratio accuracy. By connecting the secondary output to appropriate measuring instruments, a wide variety of measurement applications can be achieved.
2. Features
• Primary current input supports both direct input and through-core connection.
Direct input nominal range: 0.1 A … 200 A.
Through-core nominal range: 500 A … 20 kA.
• Secondary output signal can be configured as either current-mode (I/I) or voltage-mode (I/V).
I/I type: Best proportional uncertainty reaches 2 ppm.
I/V type: Best proportional uncertainty reaches 10 ppm.
• Measurement Frequency: DC ~ 5 kHz
3. Application
• Establish DC / AC current precision measurement system
• Calibration of DC / AC current source or ammeter
• Calibration of DC current ratio standard (current comparator)
• Calibration of DC current transformer / sensor
• Calibration of DC I/V conversion standards
☆ Flexible Current Access and Signal Output Mode |
|
The current input supports two connection methods: direct connection and through-core connection. • Direct Connection: Utilizes standard current terminals, suitable for measuring smaller currents with a nominal input range of 0.1 A to 200 A. • Through-Core Connection: Features an aperture designed for easy threading of large-gauge conductors, suitable for measuring high currents with a nominal input range of 500 A to 20 kA. |
The secondary output signal can be selected as either voltage type or current type. • Voltage Output (I/V Type): Provides a nominal output of 1 V, facilitating connection to precision voltmeters for current conversion and measurement. • Current Output (I/I Type): Provides a nominal output range of 0.1 A to 5 A. It is suitable for calibrating DC ratio standards (current comparators), DC I/V conversion standards, DC current transformers, and for extending the current range of DC power meters. |
3.1 Application of TH0500 I/V Type
☆ Establish Current Precision Measurement System |
|
• Users can establish a precision current measurement system by combining the TH0530, a precision voltmeter, and a stable current source. • This setup enables precision measurement of high currents or provides accurate, stable DC/AC current signals for test devices or loads. |
☆ Calibrate High Current Source / Meter |
|
• Another typical application of the type I / V transform is paired with a precision voltmeter to calibrate the AC high current standard source / meter. |
☆ Calibrate I/V Conversion Standards |
|
• Using the I/V type TH0500, you can calibrate the DC shunt, current transducer and other I/ V transform devices in the following two methods. • Calibration by difference method: The selected TH0500 is in the same proportion as the tested I/V, and a micro voltmeter such as a nanovoltmeter is used for calibration • Calibration by voltage ratio method: The selected TH0500 is not proportional to the tested I / V and is calibrated using a voltage ratio measurement device. (Note: For the calibration of type I /I conversion standard such as current comparator and DC current transformer, type I/ I TH0500 is recommended as the standard; the secondary series standard resistance being tested I / I is also used as described in the method above figure.) |
3.2 Application of TH0500 I/I Type
☆Calibrate I/I Conversion Standards |
|
• I/I type TH0500 can be used to calibrate DC current comparator, current transformer and other I/I conversion equipment according to the following two methods. • Calibration by difference method: the selected TH0500 is in the same proportion as the tested I/I μA micro ammeter for calibration. • Calibration by current ratio method: TH0500 selected is not in the same proportion as the tested I/I, and the current ratio measuring device is used for calibration |
☆ Establish High Voltage and High Current Power/ Energy Precision Measurement System |
|
• The TH0530 can be paired with high-voltage V/V conversion equipment (typically such as the TH0170 Precision DC Voltage Divider) and standard power/energy meters (typically such as the TH1300 AC/DC Power and Energy Measurement Standard) to form a high-voltage, high-current power/energy precision measurement system. • This system is used for measuring the output power of high-power sources, the efficiency of conversion equipment, and for calibrating high-current power sources, power meters, and other devices. |
4. Specification
4.1 Direct Connected I/I Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Current ( A ) | Nominal Ratio | Measurement Accuracy ( ± μA / A, referenced to full-scale value) | |
DC | AC@53Hz | ||||
TH0500-I-D-01A-01A-2 | 0.1 | 0.1 | 1:1 | 2 | 150 |
TH0500-I-D-02A-01A-2 | 0.2 | 0.1 | 2:1 | 2 | 150 |
TH0500-I-D-05A-01A-2 | 0.5 | 0.1 | 5:1 | 2 | 150 |
TH0500-I-D-1A-01A-2 | 1 | 0.1 | 10:1 | 2 | 150 |
TH0500-I-D-2A-01A-2 | 2 | 0.1 | 20:1 | 2 | 150 |
TH0500-I-D-5A-01A-2 | 5 | 0.1 | 50:1 | 2 | 150 |
TH0500-I-D-10A-01A-2 | 10 | 0.1 | 100:1 | 2 | 150 |
TH0500-I-D-20A-01A-2 | 20 | 0.1 | 200:1 | 2 | 150 |
TH0500-I-D-50A-01A-2 | 50 | 0.1 | 500:1 | 2 | 150 |
TH0500-I-D-100A-01A-2 | 100 | 0.1 | 1000:1 | 2 | 150 |
TH0500-I-D-200A-01A-2 | 200 | 0.1 | 2000:1 | 2 | 150 |
• Measurement range: ± (0~120%) * FS; Measuring frequency: DC~5 kHz (3dB signal bandwidth ≥ 100 kHz)
4.2 Through Core I/I Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Current ( A ) | Nominal Ratio | Measurement Accuracy ( ± μA / A, referenced to full-scale value) | |
DC | AC@53Hz | ||||
TH0500-I-T-500A-02A-5 | 500 | 0.2 | 2500:1 | 5 | 150 |
TH0500-I-T-1kA-05A-5 | 1 k | 0.5 | 2000:1 | 5 | 150 |
TH0500-I-T-2kA-1A-5 | 2 k | 1 | 2000:1 | 5 | 150 |
TH0500-I-T-5kA-2A-5 | 5 k | 2 | 2500:1 | 5 | 150 |
TH0500-I-T-10kA-2A-10 | 10 k | 2 | 5000:1 | 10 | 150 |
TH0500-I-T-20kA-5A-20 | 20 k | 5 | 4000:1 | 20 | 150 |
• Measurement Range: ±(0~110%) of Full Scale (FS)
• Measurement Frequency: DC ~ 5 kHz (Signal bandwidth ≥ 100 kHz at 3dB)
• Note: The nominal secondary output current can be customized according to customer requirements.
4.3 Direct Connected I/V Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Voltage ( V ) | Measurement Accuracy ( ± 1×10-6, referenced to full-scale value) | |
DC | AC@53Hz | |||
TH0500-U-D-01A-1V-10 | 0.1 | 1 | 10 | 200 |
TH0500-U-D-02A-1V-10 | 0.2 | 1 | 10 | 200 |
TH0500-U-D-05A-1V-10 | 0.5 | 1 | 10 | 200 |
TH0500-U-D-1A -1V-10 | 1 | 1 | 10 | 200 |
TH0500-U-D-2A-1V-10 | 2 | 1 | 10 | 200 |
TH0500-U-D-5A-1V-10 | 5 | 1 | 10 | 200 |
TH0500-U-D-10A-1V-10 | 10 | 1 | 10 | 200 |
TH0500-U-D-20-1V-10 | 20 | 1 | 10 | 200 |
TH0500-U-D-50A-1V-10 | 50 | 1 | 10 | 200 |
TH0500-U-D-100-1V-10 | 100 | 1 | 10 | 200 |
TH0500-U-D-200A-1V-10 | 200 | 1 | 10 | 200 |
TH0500-U-D-01A-1V-20 | 0.1 | 1 | 20 | 200 |
TH0500-U-D-02A-1V-20 | 0.2 | 1 | 20 | 200 |
TH0500-U-D-05A-1V-20 | 0.5 | 1 | 20 | 200 |
TH0500-U-D-1A-1V-20 | 1 | 1 | 20 | 200 |
TH0500-U-D-2A-1V-20 | 2 | 1 | 20 | 200 |
TH0500-U-D-5A-1V-20 | 5 | 1 | 20 | 200 |
TH0500-U-D-10A-1V-20 | 10 | 1 | 20 | 200 |
TH0500-U-D-20A-1V-20 | 20 | 1 | 20 | 200 |
TH0500-U-D-50A-1V-20 | 50 | 1 | 20 | 200 |
TH0500-U-D-100A-1V-20 | 100 | 1 | 20 | 200 |
TH0500-U-D-200A-1V-20 | 200 | 1 | 20 | 200 |
TH0500-U-D-01A-1V-50 | 0.1 | 1 | 50 | 200 |
TH0500-U-D-02A-1V-50 | 0.2 | 1 | 50 | 200 |
TH0500-U-D-05A-1V-50 | 0.5 | 1 | 50 | 200 |
TH0500-U-D-1A-1V-50 | 1 | 1 | 50 | 200 |
TH0500-U-D-2A-1V-50 | 2 | 1 | 50 | 200 |
TH0500-U-D-5A-1V-50 | 5 | 1 | 50 | 200 |
TH0500-U-D-10A-1V-50 | 10 | 1 | 50 | 200 |
TH0500-U-D-20A-1V-50 | 20 | 1 | 50 | 200 |
TH0500-U-D-50A-1V-50 | 50 | 1 | 50 | 200 |
TH0500-U-D-100A-1V-50 | 100 | 1 | 50 | 200 |
TH0500-U-D-200A-1V-50 | 200 | 1 | 50 | 200 |
• Measurement Range: ±(0~120%) of Full Scale (FS)
• Measurement Frequency: DC ~ 5 kHz (3dB signal bandwidth ≥ 100 kHz)
4.4 Through Core I/V Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Voltage ( V ) | Measurement Accuracy ( ± 1×10-6, referenced to full-scale value) | |
DC | AC@53Hz | |||
TH0500-U-T-500A-1V-10 | 500 | 1 | 10 | 200 |
TH0500-U-T-1kA-1V-10 | 1 k | 1 | 10 | 200 |
TH0500-U-T-2kA-1V-10 | 2 k | 1 | 10 | 200 |
TH0500-U-T-5kA-1V-10 | 5 k | 1 | 10 | 200 |
TH0500-U-T-500A-1V-20 | 500 | 1 | 20 | 200 |
TH0500-U-T-1kA-1V-20 | 1 k | 1 | 20 | 200 |
TH0500-U-T-2kA-1V-20 | 2 k | 1 | 20 | 200 |
TH0500-U-T-5kA-1V-20 | 5 k | 1 | 20 | 200 |
TH0500-U-T-10kA-1V-20 | 10 k | 1 | 20 | 200 |
TH0500-U-T-500A-1V-50 | 500 | 1 | 50 | 200 |
TH0500-U-T-1kA-1V-50 | 1 k | 1 | 50 | 200 |
TH0500-U-T-2kA-1V-50 | 2 k | 1 | 50 | 200 |
TH0500-U-T-5kA-1V-50 | 5 k | 1 | 50 | 200 |
TH0500-U-T-10kA-1V-50 | 10 k | 1 | 50 | 200 |
TH0500-U-T-20kA-1V-50 | 20 k | 1 | 50 | 200 |
• Measurement Range: ±(0~110%) of Full Scale (FS)
• Measurement Frequency: DC ~ 5 kHz (3dB signal bandwidth ≥ 100 kHz)
5. General Specification
Preheat Time | 30 minutes |
Temperature Performance | Working temperature: 0°C~45°C; Storage temperature: -10°C~55°C |
Humidity Performance | Working humidity: < 80% @ 30°C, < 70% @ 40°C, < 40% @ 50°C Storage humidity: (20%~80%) R·H, non-condensing. |
6. Ordering Information

Note: Please refer to the specifications in 4.1~4.4 for model selection
4. Specification
4.1 Direct Connected I/I Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Current ( A ) | Nominal Ratio | Measurement Accuracy ( ± μA / A, referenced to full-scale value) | |
DC | AC@53Hz | ||||
TH0500-I-D-01A-01A-2 | 0.1 | 0.1 | 1:1 | 2 | 150 |
TH0500-I-D-02A-01A-2 | 0.2 | 0.1 | 2:1 | 2 | 150 |
TH0500-I-D-05A-01A-2 | 0.5 | 0.1 | 5:1 | 2 | 150 |
TH0500-I-D-1A-01A-2 | 1 | 0.1 | 10:1 | 2 | 150 |
TH0500-I-D-2A-01A-2 | 2 | 0.1 | 20:1 | 2 | 150 |
TH0500-I-D-5A-01A-2 | 5 | 0.1 | 50:1 | 2 | 150 |
TH0500-I-D-10A-01A-2 | 10 | 0.1 | 100:1 | 2 | 150 |
TH0500-I-D-20A-01A-2 | 20 | 0.1 | 200:1 | 2 | 150 |
TH0500-I-D-50A-01A-2 | 50 | 0.1 | 500:1 | 2 | 150 |
TH0500-I-D-100A-01A-2 | 100 | 0.1 | 1000:1 | 2 | 150 |
TH0500-I-D-200A-01A-2 | 200 | 0.1 | 2000:1 | 2 | 150 |
• Measurement range: ± (0~120%) * FS; Measuring frequency: DC~5 kHz (3dB signal bandwidth ≥ 100 kHz)
4.2 Through Core I/I Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Current ( A ) | Nominal Ratio | Measurement Accuracy ( ± μA / A, referenced to full-scale value) | |
DC | AC@53Hz | ||||
TH0500-I-T-500A-02A-5 | 500 | 0.2 | 2500:1 | 5 | 150 |
TH0500-I-T-1kA-05A-5 | 1 k | 0.5 | 2000:1 | 5 | 150 |
TH0500-I-T-2kA-1A-5 | 2 k | 1 | 2000:1 | 5 | 150 |
TH0500-I-T-5kA-2A-5 | 5 k | 2 | 2500:1 | 5 | 150 |
TH0500-I-T-10kA-2A-10 | 10 k | 2 | 5000:1 | 10 | 150 |
TH0500-I-T-20kA-5A-20 | 20 k | 5 | 4000:1 | 20 | 150 |
• Measurement Range: ±(0~110%) of Full Scale (FS)
• Measurement Frequency: DC ~ 5 kHz (Signal bandwidth ≥ 100 kHz at 3dB)
• Note: The nominal secondary output current can be customized according to customer requirements.
4.3 Direct Connected I/V Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Voltage ( V ) | Measurement Accuracy ( ± 1×10-6, referenced to full-scale value) | |
DC | AC@53Hz | |||
TH0500-U-D-01A-1V-10 | 0.1 | 1 | 10 | 200 |
TH0500-U-D-02A-1V-10 | 0.2 | 1 | 10 | 200 |
TH0500-U-D-05A-1V-10 | 0.5 | 1 | 10 | 200 |
TH0500-U-D-1A -1V-10 | 1 | 1 | 10 | 200 |
TH0500-U-D-2A-1V-10 | 2 | 1 | 10 | 200 |
TH0500-U-D-5A-1V-10 | 5 | 1 | 10 | 200 |
TH0500-U-D-10A-1V-10 | 10 | 1 | 10 | 200 |
TH0500-U-D-20-1V-10 | 20 | 1 | 10 | 200 |
TH0500-U-D-50A-1V-10 | 50 | 1 | 10 | 200 |
TH0500-U-D-100-1V-10 | 100 | 1 | 10 | 200 |
TH0500-U-D-200A-1V-10 | 200 | 1 | 10 | 200 |
TH0500-U-D-01A-1V-20 | 0.1 | 1 | 20 | 200 |
TH0500-U-D-02A-1V-20 | 0.2 | 1 | 20 | 200 |
TH0500-U-D-05A-1V-20 | 0.5 | 1 | 20 | 200 |
TH0500-U-D-1A-1V-20 | 1 | 1 | 20 | 200 |
TH0500-U-D-2A-1V-20 | 2 | 1 | 20 | 200 |
TH0500-U-D-5A-1V-20 | 5 | 1 | 20 | 200 |
TH0500-U-D-10A-1V-20 | 10 | 1 | 20 | 200 |
TH0500-U-D-20A-1V-20 | 20 | 1 | 20 | 200 |
TH0500-U-D-50A-1V-20 | 50 | 1 | 20 | 200 |
TH0500-U-D-100A-1V-20 | 100 | 1 | 20 | 200 |
TH0500-U-D-200A-1V-20 | 200 | 1 | 20 | 200 |
TH0500-U-D-01A-1V-50 | 0.1 | 1 | 50 | 200 |
TH0500-U-D-02A-1V-50 | 0.2 | 1 | 50 | 200 |
TH0500-U-D-05A-1V-50 | 0.5 | 1 | 50 | 200 |
TH0500-U-D-1A-1V-50 | 1 | 1 | 50 | 200 |
TH0500-U-D-2A-1V-50 | 2 | 1 | 50 | 200 |
TH0500-U-D-5A-1V-50 | 5 | 1 | 50 | 200 |
TH0500-U-D-10A-1V-50 | 10 | 1 | 50 | 200 |
TH0500-U-D-20A-1V-50 | 20 | 1 | 50 | 200 |
TH0500-U-D-50A-1V-50 | 50 | 1 | 50 | 200 |
TH0500-U-D-100A-1V-50 | 100 | 1 | 50 | 200 |
TH0500-U-D-200A-1V-50 | 200 | 1 | 50 | 200 |
• Measurement Range: ±(0~120%) of Full Scale (FS)
• Measurement Frequency: DC ~ 5 kHz (3dB signal bandwidth ≥ 100 kHz)
4.4 Through Core I/V Conversion Standard
Model | Nominal Input Current ( A ) | Nominal Output Voltage ( V ) | Measurement Accuracy ( ± 1×10-6, referenced to full-scale value) | |
DC | AC@53Hz | |||
TH0500-U-T-500A-1V-10 | 500 | 1 | 10 | 200 |
TH0500-U-T-1kA-1V-10 | 1 k | 1 | 10 | 200 |
TH0500-U-T-2kA-1V-10 | 2 k | 1 | 10 | 200 |
TH0500-U-T-5kA-1V-10 | 5 k | 1 | 10 | 200 |
TH0500-U-T-500A-1V-20 | 500 | 1 | 20 | 200 |
TH0500-U-T-1kA-1V-20 | 1 k | 1 | 20 | 200 |
TH0500-U-T-2kA-1V-20 | 2 k | 1 | 20 | 200 |
TH0500-U-T-5kA-1V-20 | 5 k | 1 | 20 | 200 |
TH0500-U-T-10kA-1V-20 | 10 k | 1 | 20 | 200 |
TH0500-U-T-500A-1V-50 | 500 | 1 | 50 | 200 |
TH0500-U-T-1kA-1V-50 | 1 k | 1 | 50 | 200 |
TH0500-U-T-2kA-1V-50 | 2 k | 1 | 50 | 200 |
TH0500-U-T-5kA-1V-50 | 5 k | 1 | 50 | 200 |
TH0500-U-T-10kA-1V-50 | 10 k | 1 | 50 | 200 |
TH0500-U-T-20kA-1V-50 | 20 k | 1 | 50 | 200 |
• Measurement Range: ±(0~110%) of Full Scale (FS)
• Measurement Frequency: DC ~ 5 kHz (3dB signal bandwidth ≥ 100 kHz)
5. General Specification
Preheat Time | 30 minutes |
Temperature Performance | Working temperature: 0°C~45°C; Storage temperature: -10°C~55°C |
Humidity Performance | Working humidity: < 80% @ 30°C, < 70% @ 40°C, < 40% @ 50°C Storage humidity: (20%~80%) R·H, non-condensing. |
6. Ordering Information

Note: Please refer to the specifications in 4.1~4.4 for model selection
