1. Summary
TD1540 is a set of instruments dedicated to calibrating DC shunts. It consists of a DC standard high current source and a precision DC voltmeter. It has the characteristics of wide measurement range, high precision, high stability, and good safety performance.
It can be used in various levels of measurement and power departments to calibrate various DC shunts for measurement, and it is also suitable for manufacturers to conduct quality inspections on products to promote the improvement of quality and corporate competitiveness.
2. Feature
• Available in Class 0.02 and Class 0.05
• DC standard large current source: 0.5 A ~ 600 A
• Precision DC voltage measurement: 100 μV ~ 11 V
• Resistance measurement range: 200 nΩ ~ 6 Ω
• Multiple value output adjustment methods
• Large-size LCD touch screen, combined with digital key operation
• Using constant current source mode measurement, DC current output accuracy is high
• Measure the resistance value and basic error of the shunt, and draw R (I) and R (t) curves
• The device has good protection and high reliability
• Special automatic test software (optional)
3. Application
☆ Calibration of DC High Current Equipment |
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• The device has a built-in DC current standard source with an output range of 0.5 A to 600 A. The current accuracy of the Class 0.02 device reaches Class 0.01, which is suitable for calibrating DC high current meters of Class 0.05 and below. • The device can provide 600 A of high current for the primary side of current conversion devices (such as mutual inductors, I/I conversion, I/V conversion, etc.). |
☆ Verifying DC Shunts |
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• DC high current standard source: maximum output up to 600 A, can be used as the primary current input of DC shunt. • Precision DC voltmeter: supports voltage input range of 100 μV~11 V, can measure the secondary output voltage of the shunt. • Special low thermal potential wire and terminal: can effectively reduce the measurement uncertainty introduced by contact potential and thermal potential. • DC shunt verification and testing: can measure the resistance value and basic error of the shunt, draw R(I) and R(t) curves, and provide effective testing means for analyzing key parameters such as power coefficient and thermal potential influence of the shunt. |
4. Appearance
☆ Front Panel | |
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S/N | Function |
| Power switch: supports one-button turning on or off of the instrument; |
| Small signal voltage output/measurement terminal: supports small signal voltage measurement range of ±(10 μV~11 V); |
| Main interface display: color touch screen, displays output/measurement value, and supports setting parameters; |
| Key function area: adjust value output, function setting; |
| Front panel handle: convenient for carrying the instrument |
| Front panel: the front panel is equipped with a standardized cabinet interface, which supports the installation of the instrument into the cabinet for systematic integration |
☆ Rear Panel | |
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S/N | Function |
| DC current output terminal: supports a maximum DC current output of 600 A |
| Case ground: Before using the device, ensure that the case ground is reliably grounded |
| Communication interface: includes expansion interface, RS232, USB, LAN, which is convenient for building a fully automatic test system; |
| Power interface: AC 220 V power input interface with 16 A fuse. |
5.Characteristic
☆ Current Output With High Accuracy And Stability |
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• High accuracy: Using precision integrated circuit devices, various performance indicators still have a small change under long-term conditions, ensuring that the system has high long-term accuracy. • High stability: The standard source output has the characteristics of high stability. The closed-loop negative feedback system design principle is adopted, which can feedback the measurement and adjust the output power value in real time to ensure high output stability. • High safety performance: The wide range of large current output is controlled by program to rise and fall slowly, reducing current surges and avoiding power overshoot on the measured resistor. |
☆ Convenient Operation |
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• Large-size LCD screen: full color, high screen brightness, clear picture quality, support touch operation, comprehensive functions, simple and fast. • Digital programmable buttons: can realize direct output, rotary knob, step adjustment and other input methods, easy and fast operation. |
☆ Multiple Output Methods |
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• Direct Output: By using the numeric keypad on the console or tapping the touchscreen, users can directly set the desired output value. The instrument will automatically switch to the optimal range, making the calibration process highly convenient. • Especially when setting current, users can simply input the desired current value (as shown in Figure b), ensuring easy operation. |
☆ Rotary Knob Output |
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• The keypad includes a "rotary knob" for adjusting the output value by rotating clockwise or counterclockwise. |
☆ Pro Testing Software |
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• Equipped with automated testing software compatible with shunt testing projects in relevant procedures, enabling automated testing and report generation to improve efficiency. • Supports fully or semi-automated calibration of devices under test, including data recording, analysis, management, and exporting customized template reports. *(Fully automated calibration requires the devices under test to support communication and provide open protocols.)* • Software functions can be customized per customer requirements, with support for adding new testing standards through future upgrades. |
6. Specification
6.1 DCI Output
Range | Short-term Stability (% / min) | Measurement Uncertainty (k=2) (ppm*RD+ppm*RG)① | Maximum Load Voltage(V) | ||
Class 0.05 | Class 0.02 | Class 0.05 | Class 0.02 | ||
5 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
10 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
20 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
50 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
100 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
200 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
500 A | 0.005 | 0.003 | 120 + 80 | 60 + 40 | 3.5 |
Note ①: RD is the reading value, RG is the range value, the same below | |||||
Output range: 0.5 A~600 A, ripple factor: <0.5%
7-digit display, adjustment fineness: 0.001%*RG
Protection function: open circuit protection, overload protection
6.2 DCV Measurement
Range | Measurement Uncertainty (k=2) (ppm*RD+μV) | Temperature Coefficient @ (15~30)°C (ppm*RG/°C) | ||
Class 0.05 | Class 0.02 | Class 0.05 | Class 0.02 | |
1 mV | 150 + 1 | 80 + 0.5 | <30 | <15 |
10 mV | 150 + 3 | 80 + 1.5 | <10 | <5 |
100 mV | 150 + 10 | 80 + 5 | <10 | <5 |
1 V | 150 + 20 | 80 + 10 | <5 | <2 |
10 V | 150 + 100 | 80 + 50 | <5 | <2 |
Measuring range: ±(100 μV~11 V), manual/automatic range switching, 7-digit display
Input resistance: >1 GΩ, input protection: 50 Vpk, continuous.
6.3 DC Resistance Measurement
Test Current | Voltage Range | Measuring Range of Resistance R | Measurement uncertainty (k = 2) @ full scale voltage value② | |
Class 0.05 | Class 0.02 | |||
5 A | (0.1~1) mV | 20 μΩ ≤ R ≤ 200 μΩ | 0.135% | 0.068% |
(1~10) mV | 200 μΩ < R ≤ 2 mΩ | 0.065% | 0.033% | |
(10~100) mV | 2 mΩ < R ≤ 20 mΩ | 0.045% | 0.023% | |
(0.1~1) V | 20 mΩ < R ≤ 200 mΩ | 0.037% | 0.019% | |
(1~3) V | 200 mΩ < R ≤600 mΩ | 0.036% | 0.019% | |
10 A | (0.1~1) mV | 10 μΩ ≤ R ≤ 100 μΩ | 0.135% | 0.068% |
(1~10) mV | 100 μΩ < R ≤ 1 mΩ | 0.065% | 0.033% | |
(10~100) mV | 1 mΩ < R ≤ 10 mΩ | 0.045% | 0.023% | |
(0.1~1) V | 10 mΩ < R ≤ 100 mΩ | 0.037% | 0.019% | |
(1~3) V | 100 mΩ < R ≤300 mΩ | 0.036% | 0.019% | |
20 A | (0.1~1) mV | 5 μΩ ≤ R ≤ 50 μΩ | 0.135% | 0.068% |
(1~10) mV | 50 μΩ < R ≤ 500 μΩ | 0.065% | 0.033% | |
(10~100) mV | 500 μΩ < R ≤ 5 mΩ | 0.045% | 0.023% | |
(0.1~1) V | 5 mΩ < R ≤ 50 mΩ | 0.037% | 0.019% | |
(1~3) V | 50 mΩ < R ≤ 150 mΩ | 0.036% | 0.019% | |
50 A | (0.1~1) mV | 2 μΩ ≤ R ≤ 20 μΩ | 0.135% | 0.068% |
(1~10) mV | 20 μΩ < R ≤ 200 μΩ | 0.065% | 0.033% | |
(10~100) mV | 200 μΩ < R ≤ 2 mΩ | 0.045% | 0.023% | |
(0.1~1) V | 2 mΩ < R ≤ 20 mΩ | 0.037% | 0.019% | |
(1~3) V | 20 mΩ < R ≤ 60 mΩ | 0.036% | 0.019% | |
100 A | (0.1~1) mV | 1 μΩ ≤ R ≤ 10 μΩ | 0.135% | 0.068% |
(1~10) mV | 10 μΩ < R ≤ 100 μΩ | 0.065% | 0.033% | |
(10~100) mV | 100 μΩ < R ≤ 1 mΩ | 0.045% | 0.023% | |
(0.1~1) V | 1 mΩ < R ≤ 10 mΩ | 0.037% | 0.019% | |
(1~3) V | 10 mΩ < R ≤ 30 mΩ | 0.036% | 0.019% | |
200 A | (0.1~1) mV | 500 nΩ ≤ R ≤ 5 μΩ | 0.135% | 0.068% |
(1~10) mV | 5 μΩ < R ≤ 50 μΩ | 0.065% | 0.033% | |
(10~100) mV | 50 μΩ < R ≤ 500 μΩ | 0.045% | 0.023% | |
(0.1~1) V | 500 μΩ < R ≤ 5 mΩ | 0.037% | 0.019% | |
(1~3) V | 5 mΩ< R ≤ 15 mΩ | 0.036% | 0.019% | |
500 A | (0.1~1) mV | 200 nΩ ≤ R ≤ 2 μΩ | 0.135% | 0.068% |
(1~10) mV | 2 μΩ < R ≤ 20 μΩ | 0.065% | 0.033% | |
(10~100) mV | 20 μΩ < R ≤ 200 μΩ | 0.045% | 0.023% | |
(0.1~1) V | 200 μΩ < R ≤ 2 mΩ | 0.037% | 0.019% | |
(1~3) V | 2 mΩ< R ≤ 6 mΩ | 0.036% | 0.019% | |
Note ②: The resistance measurement uncertainty corresponding to other voltage values = (∆U/U0+∆I/I0), where U0 and I0 are the current voltage and current readings, and ∆U and ∆I are the absolute errors of the current measured voltage and current values. | ||||
Resistance measurement range: 200 nΩ~6 Ω, 6-digit display, minimum resolution: 1 pΩ
Current test point can be set via digital buttons, voltage range: manual/automatic switching
After loading the test current, the R(t) change curve can be tested
7. General Specification
Power Supply | AC ( 220 ± 22 ) V，( 50 ± 2 ) Hz； |
Warm-up Time | 30 minutes； |
Maximum Power Consumption | 3 kVA |
Temperature Performance | Working temperature: 15°C～30°C; Calibration temperature: 18°C～22°C; Storage temperature: -20°C～70°C |
Humidity Performance | Operating humidity: < 80% @ 30°C, < 70% @ 40°C, < 40% @ 50°C Storage humidity: (20%～80%) R·H, non-condensing |
Altitude | < 3000 m |
Weight | Approx. 45 kg |
Communication Interface | RS232, USB, LAN |
Maximum Dimensions | 435 mm (W) × 470 mm (D) × 250 mm (H) (excluding handles and feet) |
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8. Ordering Information
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