TH1300 DC High Current Shunt with Sensor Calibration System

• After-sales Service: Life Time
• Warranty: 12 Months Excellent After-sales Service
• Power: Electricity
• Current Output: ± (100 A ~ 10 kA)
• LCD Display: With LCD Display
• Customized: Non-Customized
• Model NO.: TH1300
• TH6000 Bipolar DC High Current Source: ± (100 A ~ 10 kA)
• TH1860 Bipolar Ultra-stable Constant Cur: ± (1A ~ 110 A)
• TH0330 Ultra-stable Standard Resistor: 1 Ω~1 kΩ
• Resistor Multiplexer Input Channel: 10 channels
• Resistor Multiplexer Output Channel: Single channel
• Transport Package: Package for Exporting
• Specification: 5700 mm× 1850 mm(L, W)
• Trademark: TUNKIA
• Origin: China
• Production Capacity: 1000

Product Description

TH1300 DC High Current Shunt with Sensor Calibration System 
(Bipolar)

1. Summary

TH1300 can be fully automatic programmable output ± ( 0.1 mA~10 kA) with high precision, high stability, wide range of DC current. It is suitable for calibrating DC shunts with resistance value of 0.1 μΩ~100 kΩ, standard resistors, and also suitable for calibration of high-precision current sensors. It provides a reliable technical guarantee for the establishment of high-precision current and resistance transmission system for high-level metrology laboratories.
Equipped with three sets of bipolar current sources with different output ranges, all of which can be quickly commutated through program control, effectively removing the influence of thermoelectric potential on measurement and avoiding the disadvantage of poor contact with long-term relays Provide high reliability assurance for industrial-grade products for measurement and testing. Among them, TH6000 is a modular design of high-current sources, multiple current sources can be directly connected in parallel to generate ± ( 100A~10kA DC high current; TH1860 can accurately output ± ( 1 A ~ 1 1 0 A ) DC current, also  It is a constant current source with ultra-low noise, high precision, high linearity and better fineness; TH0740 A can output ± ( 0.1 mA~1 A ) DC current External standard resistors make precise measurements of the tested resistance.
The system is designed with two calibration schemes, direct measurement method and comparative method, to meet the calibration needs of different grades of shunts and sensors. (1) Direct measurement method: the use of bipolar current standard source with secondary signal measurement unit, can be 0.02 level and below DC shunt or current Fast automatic calibration of the sensor. (2) Comparative method: the use of bipolar current standard source with ultra-precision current proportional extender (can be cascaded), ultra-stable standard resistance, standard resistance measurement device through current polarity exchange can achieve ultra-high accuracy is suitable for calibrating 0.02 and above high-precision DC shunts and current sensors.
All components of the system can be controlled by computer software, and after the user is wired, it can realize automatic calibration, automatic saving of the original data of the inspected equipment, and automatic export/printing of calibration certificate.
 

2. Features

1. TH6000 bipolar high current source: powered by bidirectional power supply, internal circuit to achieve ± (100 A~10 kA) bipolar DC current programmable output. All range shifts do not use relays, which can realize fast commutation and range switching of high-current sources, effectively remove the influence of thermoelectric potential on resistance measurement, and avoid the shortcomings of poor contact with long-term relays. This bipolar current source scheme can provide high reliability assurance for industrial-grade products for metrological inspection.

Modular design of current source: using the combination output of multiple current sources, each current source has a built-in broadband current comparator for current measurement and control to ensure high stability and accuracy of current. Modular design improves maintenance efficiency even after maintenance; It is also easy to upgrade in the future, and the output range of the current can be expanded by adding a current source module, saving customers investment.
High stability and accuracy: the short-term stability of DC current output can reach 2.5ppm/min, 8ppm/h; Absolute accuracy of ±50 μ A/A. The software-controlled high current slowly rises and falls, reduces current surges, avoids power overshoot on the product under test, and provides a guarantee for high-precision sensor and shunt detection.

1. TH1860 bipolar superstable constant current source: can accurately output ± ( 1 A~110 A) bipolar DC current, short-term stability up to 0 .4 ppm/min, 1.5ppm/h, absolute accuracy of ±15 μ A/A, is a constant current source with ultra-low noise, high precision, high linearity, and better fineness, which has been upgraded to an unprecedented level of accuracy and ultra-low noise in the commercial instrument market .
2. TH0740A standard resistance measuring device: can accurately output ± (0.1 mA~1 A) bipolar DC current, external ultra-stable standard resistor, the realization range is 1Ω~ Quantity transmission of standard resistance of 100 kΩ; With dual-channel voltage ratio measurement function, with ultra-precision current proportional extender (can be cascaded), ultra-stable standard resistor and current polarity exchange can realize the range of 0.1 μ Ω~1 Ω ultra-high accuracy resistance or ratio transmission.
3. Ultra-stable standard resistance: It is an air-type standard resistance with an annual stability of 0 2 ppm, can be used at (23 ± 5)°C, and achieves ultra-high stability without the need for a thermostatic oil sump.
4. Standard resistance multiplexer: multiple standard resistors of different specifications are connected at the same time, and according to the calibration requirements when used, the standard resistors of different specifications that have been accessed are switched by program control, reducing the user's repeated wiring steps and effectively improving the calibration efficiency.
5. Sensor special test tooling: designed for the fast wiring of the through-core high-current sensor, equipped with a detachable current copper rod, which is conducive to the formation of a uniform magnetic field between the tested and the standard sensor, and further reduces the measurement error; And built-in sensor secondary signal measurement module and power supply module, can complete the proportional error, linearity error, power consumption and other detection items of the sensor.
6. Special test position for shunt: A special bracket for high-current wiring is designed to be a special device test position, which is convenient for accessing the DC shunt. With the high-precision shunt secondary voltage measurement module, the error detection of the shunt can be realized, and R(I), R(t) and other curves can be drawn.
7. System traceability: It can facilitate traceability calibration of large currents, either by tracing the independent output of a single current source, or by tracing the overall output of all current sources.

 

3. Overall introduction of the system

Figure 3-1 Schematic diagram of the system layout

Module	Name	Brief introduction
1	Single 600A bipolar high current source	The complete system consists of a total of 6 current source cabinets. Each cabinet has three bipolar high-current sources with a maximum output of 600A, for a total of 18 current sources. Each source is equipped with an independent measurement and control module to ensure high current stability and accuracy. The system can output ± bipolar DC high current (100 A~10 kA) through program-controlled output.
2	Current source cabinet
3	Sensor test bits	(1) Equipped with a set of sensor test tooling, equipped with a set of four specifications of deflector copper rod, which is convenient for the detection of the through-core sensor. (2) The tooling panel is equipped with a set of sensor output signal tester (support the measurement and measurement of voltage and current signals) and auxiliary power supply interface, which is convenient for users to connect during testing.
4	Confluence copper bar	The output current of each current source module is output through a specially designed copper bus.
5	Shunt test bits	Includes two high-current test bits for calibration of shunts of different sizes. When one test bit is connected to a DC shunt, the other test bit can be connected to a current ratio standard or shorted using a copper bar.
6	Start and emergency stop buttons	Includes power switch and emergency stop button.
7	Calibrate the workbench	The calibration bench integrates the following devices: TH1860-100A bipolar superstable constant current source; TH0740A standard resistance measuring device (built-in current, voltage ratio standard); TH0780 Ultra-Precision Current Ratio Extender (Dual Channel); TH0770 standard resistance multiplexer; TH0330 Ultra-stable standard resistance (air type); Measurement console, computer printing. See Figure 4-1 for details.

4. Calibration Workbench

Figure 4-1 Schematic diagram of the calibration bench

Module	Name	Brief introduction
1	TH0780 ultra-precision current ratio extender	It has a dual-channel ratio standard, where channel A has a maximum nominal current of 1 00 A, with 1 000:1, 1 00: 1, 1 0:1 three optional ratios; The maximum nominal current of channel B is 1 0 A, with 1 00:1, 1 0:1 two selectable scales.
2	TH1860-100A bipolar superstable constant current source	It can output ± (1A~110A) DC current, which is a constant current source with ultra-low noise, high precision, high linearity and better fineness.
3	TH0740A standard resistance measuring device	Precise output of ± ( 0 1 mA~1 A) DC current, external standard resistor to achieve precision measurement of 1 Ω~100 kΩ resistance; At the same time, it has the function of precision measurement of dual-channel voltage ratio.
4	TH0770 standard resistance multiplexer	According to the calibration requirements, the standard resistors of different specifications that have been connected are programmed to be switched.
5	TH0330 ultra-stable standard resistor	Standard resistors of different sizes are connected to the TH0770 and can be programmed to switch when used.
6	Measurement console	It can display the standard value of current output, the secondary small signal measurement value of the tested sensor or shunt, the error of the tested sensor or shunt, and the power consumption of the tested sensor in real time.
7	Computer	Run the test software, and fully automatic testing can be realized according to user settings after wiring.
8	printer	Print the test report.

5. Sensor Test Fixture

Figure 5-1 Schematic diagram of sensor test fixture

Module	Name	Brief introduction
1	Quick clamps	The left and right sides are equipped with a set of quick clamps that can be manually opened and clamped with copper rods with a clamping force of 250kg, each with four clamping holes of different diameters.
2	Copper rods	According to the size of the test current, different diameters of copper rods are selected, and the sensor is penetrated during the test, which is conducive to forming a uniform magnetic field between the tested and the standard sensor, further reducing the measurement error. Note: Copper rod current specifications: 10 kA, 5 kA, 2  kA, 1kA
3	Sensor test bits	It can be penetrated into the penetrated core current sensor and the through-core current proportional extender.
4	Low current output	For sensor testing with smaller current specifications.
5	Sensor-assisted measurement	(1) The power supply module can output DC ± (5 V~50 V) programmable adjustable voltage It also has the function of loop current and power measurement to detect the power consumption of the sensor. (2) Support the measurement of secondary voltage signal or current signal of the sensor.
6	Foldable handwheel	Turn the handwheel sensor platform to lift and move back and forth.
7	Sensor platform	It can be controlled by a handwheel to put sensors of different sizes in the appropriate test position.

6. How The System Works

6.1 Shunt calibration (direct measurement method)

The software automatically controls the rapid commutation of the current source to remove the effects of the thermoelectric potential. This method is suitable for DC shunts with lower accuracy of class 0.02 and below, and can achieve automatic and fast measurement.


Figure 6-1 Schematic diagram of calibrating a DC shunt by direct measurement
Description of the test:

1. A bipolar high-current source is used to output a standard current as the_I1 input to the DC shunt under test.
2. Measure the secondary output voltage U₂ of the shunt under test directly using a nanovoltmeter.
3. After the shunt reaches thermal equilibrium, the resistance of the shunt is calculated according to R=U 2÷I₁.
4. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.
5.  

6.2 Shunt calibration (comparative method).

Comparative method features: the use of bipolar high-current standard source with ultra-precision current proportional extender (can be cascaded), ultra-stable standard resistance, standard resistance measurement device through current polarity exchange can achieve ultra-high accuracy resistance transmission, suitable for calibrating 0.02 and above high-precision DC shunt, by the software automatically control the rapid commutation of the current source to remove the influence of thermoelectric potential.


6-2 Schematic diagram of a calibrated DC shunt (I1≥100A) by comparative method
Description of the test:

1. For DC shunt calibration with nominal current I 1≥100 A, a bipolar high-current source is used to output a standard current as the _I1 input to the shunt under test, and 1 000:1, 3 000 are selected according to the input current The TH 0780 ultra-precision current ratio extender of three specifications: 1, 1 0000:1 is connected in series with the primary side of the shunt under test.
2. The secondary output of the high-current TH 0780 is connected to the integrated TH 0780 in a dual-channel chassis, and its secondary output is connected to the external excitation input of the TH0740 A.
3. Connect the TH0330 ultra-stable standard resistor with a known resistance value to the A channel of the TH 0740 A (the user can program the TH0770 to switch the standard resistor with different resistance specifications).
4. The B-channels P 1 and P 2 of the output voltage TH0740 A of the shunt will be shortened to terminals C ₁ and C₂.
5. When the TH0740A internal bridge is balanced, the resistance of the shunt under test is measured.
6. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.

6-3 Schematic diagram of a calibration DC shunt (1 A ≤ I1 ≤ 100 A) by comparative method   
Description of the test:

1. For the calibration of DC shunts with a nominal current of less than or equal to 100 A, the TH 1860 superstable constant current source is used to output a standard current as the I1 input to the sensor under test.
2. Pass the I 1 into the primary side of the TH0780 Ultra-Precision Current Proportional Extender (integrated in a dual-channel chassis) and the system automatically selects 1 000:1, 100:1,₁ 0 based on the input current : 1 scale; Its secondary output is connected to the external excitation input of the TH0740A.
3. Connect the TH 0330 ultra-stable standard resistor with known resistance value to the A channel of the TH 0740 A (the user can program the TH0770 to switch the standard resistor with different resistance specifications).
4. The B-channels P 1 and P 2 of the output voltage TH0740 A of the shunt will be shortened to terminals C ₁ and C₂.
5. When the TH0740A internal bridge is balanced, the resistance of the shunt under test is measured.
6. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.

(3) For DC shunts or standard resistors with nominal current of 0.1 mA ≤ I₁ ≤ 1 A, TH 0330 and TH can be used directly 0740A direct calibration.

6-4 Schematic diagram of a calibration DC shunt (0.1mA ≤ I₁ ≤ 1 A) by comparative method  
Description of the test:

1. Connect a TH0330 ultrastable standard resistor of known value to the A channel of TH 0740 A

(Note: Users can switch standard resistors with different resistance specifications through TH0770 program control). .

1. The DC shunt or standard resistor is connected to the B channel of the TH0740A.
2. When the TH0740A internal bridge is balanced, the resistance of the shunt under test is measured.
3. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.

 

6.3 Sensor calibration (direct measurement method).

This method is suitable for sensor testing with lower accuracy of class 0.02 and below, enabling fast and automated measurements.

6-4 Schematic diagram of calibrating the sensor by direct measurement
Description of the test:

1. A bipolar high-current source is used to output a standard current as the_I1 input to the sensor under test.
2. The current signal I 2 (current type) or voltage signal U₂ (voltage type) output by the tested sensor is connected to the secondary signal measurement unit of the sensor, and the primary current I₁ is combined to realize the calibration of the sensor ratio.
3. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.

 

6.4 Sensor calibration (comparative method).

Comparative method features: the use of bipolar high-current standard source with ultra-high accuracy ultra-precision current proportional extender (can be cascaded), ultra-stable standard resistance, standard resistance measurement device through current polarity exchange can achieve ultra-high accuracy ratio transmission, suitable for calibrating 0.02 level and above high-precision current sensors.

6-5 Schematic diagram of a calibrated sensor (I1≥100A) by comparative method
Description of the test:

1. For the calibration of current sensors with a nominal current greater than or equal to 1 00 A, a bipolar high-current source is used to output a standard current as the _I1 input to the sensor under test, and 1 000:1, 3 000:1, 10000 are selected according to the input current :1 The TH0780 ultra-precision current proportional extender of three sizes is connected in series with the primary side of the sensor under test.
2. The secondary output of the tested sensor and the high-current specification TH 0780 is connected to the integrated TH0780 of the dual-channel chassis, and the secondary output of the dual channel is connected to two TH 0330 ultra-stable standard resistors with known resistance values for I/V conversion.
3. Then connect the voltage signals U₁ and U₂ of the two standard resistors to TH0740A for voltage ratio measurement.
4. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.

5-6 Schematic diagram of a calibrated sensor (I1≤100A) by comparative method
Description of the test:

1. For the calibration of current sensors with a nominal current of less than or equal to 1 00 A, the TH 1860-100A superstable constant current source is used to output the standard current as the I1 input to the tested sensor; Pass I 1 into the primary side of the A channel of the TH0780 ultra-precision current proportional extender (integrated in a dual-channel chassis), and the system automatically selects 1 000:1, 100:1, 1 based on the input current 0:1 ratio.
2. The secondary output of the sensor under test is connected to the primary side of the B channel of the TH0780.
3. The dual secondary outputs of the TH0780 are connected to two TH 0330 ultra-stable standard resistors of known resistance for I/V conversion.
4. Then connect the voltage signals U₁ and U₂ of the two standard resistors to TH0740A for voltage ratio measurement.
5. After the user has completed the wiring, fully automatic calibration can be realized through the computer and system software.

7. Specifications

7.1 TH6000 bipolar DC high current source

Range	Resolution	Short-term stability		Measurement uncertainty (k=2). ppm*RD+ppm*RG	Maximum load voltage (V)
		ppm/min	ppm/h	1 year
500 A	100 μA	2.5	8.0	30 + 20	3
1 kA	1mA	2.5	8.0	30 + 20	3
2 kA	1mA	2.5	8.0	30 + 20	3
5 kA	1mA	2.5	8.0	30 + 20	3
10 kA	10 mA	2.5	8.0	30 + 20	3

1. 1. Output range: ± (100 A ~ 10 kA), manual or program-controlled automatic switching
   2. Fineness adjustment: 10 ppm*RG, 7-digit decimal display
   3. Ripple coefficient: <0.5% @ 5 kHz or less, overshoot coefficient: <5%.
   4. Full-scale output settling time: < 500ms
   5. Protection function: current open circuit protection, overload protection, overtemperature protection
   6. Note: RD is the reading value, RG is the range value, the same below

 

7.2 TH1860 Bipolar superstable constant current source

current Range	Resolution ( mA )	Short-term stability ppm /min	Maximum allowable error ± ( ppm*output + ppm*range )
			24 hours	1 year
10 A	1	0.4	5 + 5	10 + 5
100 A	10	0.4	5 + 5	10 + 5

1. 1. Output range: ± (1   A ~ 110 A), display bits: 7 bits, adjustment fineness: 2ppm;
   2. Settling time: the time from setting the output to meet the requirements of the index is less than 100 ms;
   3. Test conditions: 1 hour preheating, ambient temperature 23°C±1°C, sampling rate of 1sps;
   4. Protection mode: open circuit protection, over temperature protection, overload protection.

 

7.3 TH0780 ultra-precision current proportional extender

Product model	Product name	Input current (A)	Output current (A)	proportion	accuracy (ppm)
TH0780-1A	Ultra-precision current proportional extender (integrated in one chassis).	1	0.1	10:1	0.2
TH0780-10A		10	0.1	100:1	0.2
TH0780-100A		100	0.1	1000:1	0.5
TH0780-1kA	1kA ultra-precise current proportional extender	1,000	1	1000:1	1.5
TH0780-3kA	3kA ultra-precise current proportional extender	3,000	1	3000:1	3.0
TH0780-10kA	10kA ultra-precise current proportional extender	10,000	1	10000:1	10

 

7.4 TH0330 Ultra stable standard resistor (air type).

Nominal value	Initial deviation ( ppm)	Temperature coefficient ( ppm /ºC) @23± 5ºC	Year stability ( ppm )	Rated power ( W )	Power factor ( ppm /power* )
1 H	± 2	± 0.05	± 0.2	1.0	± 1
10 Ω	± 2	± 0.05	± 0.2	1.0	± 1
100 Ω	± 2	± 0.05	± 0.2	1.0	± 1
1 kΩ	± 2	± 0.05	± 0.2	1.0	± 1
Note: TH0330 is an air-type standard resistor, with two of each specification

1. 1. Working temperature: 18 °C ~ 28 °C
   2. Storage temperature: 0~50°C
   3. Number of pins: 5

 

7.5 TH0740A standard resistance measuring device

DC standard resistance measurement
Standard resistors ( Z )	Resolution ( Z )	Test the current ( A )	Test the power ( mW )	Measurement uncertainty (k=2) ( ppm )
1	10 n	100 m	10	0.2
10	100 n	31.6 m	10	0.2
100	1 m	10 m	10	0.5
1 k	10 m	3.16 m	10	0.5
10 k	100 m	1 m	10	2
100 k	1 m	0.1 m	1	3
Note: Current ratio range: 1:1~100:1, ratio uncertainty: 0.15 ppm

 

Voltage ratio uncertainty ( k= 2 )  ( ppm )
U1 range U2 range	1 mV	10 mV	100 mV	1 V	10 V
1 mV	5 ( 0.5 ≤ K ≤ 2 ) 10 (0.1 ≤ K < 0.5or2 < K < 10)	40 ( 1 < K ≤ 2 ) 80 ( 2 < K< 10)	--	--	--
10 mV	40 ( 1 < K ≤ 2 ) 80 ( 2 < K < 10)	3 ( 0.5 ≤ K ≤ 2 ) 8 (0.1 ≤ K < 0.5or2 < K < 10)	10 ( 1 < K ≤ 2 ) 30 ( 2 < K < 10)	--	--
100 mV	--	10 ( 1 < K ≤ 2 ) 30 ( 2 < K < 10)	1 ( 0.5 ≤ K ≤ 2 ) 4 (0.1 ≤ K < 0.5or2 < K < 10)	3 ( 1 < K ≤ 2 ) 8 ( 2 < K < 10)	--
1 V	--	--	3 ( 1 < K ≤ 2 ) 8 ( 2 < K < 10)	0.5 ( 0.5 ≤ K ≤ 2 ) 2 (0.1 ≤ K < 0.5or2 < K < 10)	1.5 ( 1 < K ≤ 2 ) 4 ( 2 < K < 10)
10 V	--	--	--	1.5 ( 1 < K ≤ 2 ) 4 ( 2 < K < 10)	0.5 ( 0.5 ≤ K ≤ 2 ) 2 (0.1 ≤ K < 0.5or2 < K < 10)

Note: K = U1 / U2 if measured K > 10 or K < 0.1, should be replaced with the current proportional extender closest to the UUT ratio.

 

7.6 TH0770 standard resistor multiplexer

specification	Four-terminal channel
Connection type	Copper tellurium terminal posts
Input channel	10 channels (rear panel)
Output channel	Single channel (rear panel)
Thermal electromotive force	< 50 nV
Maximum carry / switch current	2 A @ 30 V(DC)
Contact resistance	< 0.05 h
Communication interface	RS232

 

7.7 Shunt resistance measurement (comparative method)

The value of the resistance to be measured	Proportion	Maximum current	Measurement uncertainty ( k=2 ).
100 mΩ	10:1	1 A	0.2 ppm
10 mΩ	100:1	10 A	0.3 ppm
1 mΩ	1000:1	100 A	0.4 ppm
100 mΩ	10000:1	1 kA	2 ppm
10 mΩ	100000:1	3 kA	3 ppm
1 mΩ	100000 0:1	5 kA	5 ppm
0.1 mΩ	100000 0:1	10 kA	10 ppm

 

7.8 TK1230 Sensor Output Signal Tester

Electricity type	Range	Resolution	Measurement uncertainty (k=2) ppm*RD+ppm*RG			Temperature coefficient ppm*RG/°C
			24 hours	90 days	1 year
voltage measurement	100 mV	100nV	10 + 5	15 + 5	20 + 10	<0.5
	1 V	1 μV	10 + 5	15 + 5	20 + 10	<0.5
	10 V	10 μV	10 + 5	15 + 5	20 + 10	<0.5
current measurement	10 mA	10 nA	10 + 5	15 + 5	20 + 10	<0.7
	100 mA	100 nA	10 + 5	15 + 5	20 + 10	<0.7
	1 A	1μA	10 + 5	15 + 5	20 + 10	<0.7

1. 1. Measuring range: ± (10 mV~12 V), ± (1 mA~1.1 A).
   2. Range switching: manual or automatic switching
   3. Display digits: 7-digit decimal display
   4. Voltage measurement input impedance: >100kΩ // 50pF

 

7.9 Sensor auxiliary power supply and power consumption measurement

1. 1. Output range: DC ±(5~50) V, maximum load capacity: 1 A
   2. Adjustment mode: the output voltage value can be set by the touch screen or computer software programmatically
   3. Fineness adjustment: 0 1 V
   4. Protection function: short circuit protection, overload protection, overtemperature protection
   5. Measurement function: with voltage, current, power measurement, to realize the power consumption measurement function of the sensor.
   6. Voltage/current accuracy is ±0.2% and power measurement accuracy is ±0.5%.

 

8. Installation

8.1 Floor Plans

Figure 8-1 schematic diagram of the scheme layout

The entire system occupies a single area	5700 mm×1850 mm(L×W)
Single cabinet size	560 mm×560 mm×1500 mm(W×L×H)
Laboratory size is recommended	66 00mm×3000 mm(L×W)

 

8.2 Power supply requirements

S/N	Device Name	Type of Power Supply	Maximum Power Consumption	Quantity	Total Power Consumption
1	600 A bipolar high current source module	Three-phase four-wire system AC 380V	4 kW	18 units	72kW
2	TK1230 sensor output signal tester		0.1 kW	1 set	0.1 kW
3	Sensor power supply and power consumption test module		0.1 kW	1 set	0.1 kW
4	High current source main control system		2 kW	1 set	2 kW
5	TH1860 bipolar superstable constant current source	Single-phase AC 220V	0.2 kW	1 unit	0.2 kW
6	TH0740A standard resistance measuring device	Single-phase AC 220V	0.1kwatts	1 set	0.1 kW
7	TH0770 standard resistance multiplexer	Single-phase AC 220V	0.1kwatts	1 set	0.1 kW
8	TH0780 ultra-precision current ratio extender	Single-phase AC 220V	0.1kwatts	1 set	0.1 kW
9	Computers and printers	Single-phase AC 220V	0.5 kW	1 set	0.5 kwatts
Total power consumption for the entire system					Approx 75 kW