The complete system adopts a modular design. The cabinet integrates one measurement and control main unit and a current range extender, while the bench is equipped with built-in DC voltage source and power supply units (one per meter position), meter mounting racks, and other modules.

1. Measurement and Control Main Unit: Controls the output of the DC voltage source and power supply units; integrates a 100 A standard current source and standard energy pulse function.

2. Current Range Extender: Single 550 A current module, configurable as N × 550 A output according to requirements.

3. DC Voltage Source and Power Supply Unit: Integrates a DC standard voltage source, four-wire low-level voltage source, and auxiliary power supply into one module; one unit is provided per meter position.

1. DC Voltage Source and Power Supply Unit: Integrates a DC standard voltage source (10 mV ~ 1.5 kV), a four-wire low-level voltage source (10 μV ~ 12 V), and an auxiliary power supply (DC 5 ~ 48 V) into a single module. It offers excellent expandability, versatility, and reliability, with simple maintenance.

2. DC Low-Level Voltage Source: Supports bidirectional output and adopts a four-wire Kelvin connection. It is equipped with low-thermal EMF terminals and leads. Compared with conventional two-wire voltage sources, it effectively eliminates the influence of lead resistance, contact potential, and thermal EMF on measurement accuracy.

1. Multifunction Interface: Integrates multiple functions and supports RS485 communication with the meter under test. It enables precise measurement of second pulses, forward energy pulses, and reverse energy pulses from the meter under test.

2. High-Accuracy Clock Module: Built-in clock module with an accuracy of up to 0.2 ppm. It measures second pulse signals via the interface to perform daily timing error tests.

3. Optional Reverse Energy Pulse Function: Supports both forward and reverse energy metering.

S/N

Functions

1

Measurement & Control Main Unit

Serves as the core measurement and control unit of the system, integrating a pulse module, communication module, and 100 A DC current output function.

2

Current Range Extender

Single 550 A current extension module, configurable as N × 550 A output according to requirements.

3

Current Busbar

Copper busbar for current output connection.

4

Error Display Screen

Displays the calculated error results for each meter position.

5

Multifunction Interface

Includes energy pulse ports, second pulse port, RS485 interface, and other communication interfaces.

6

DC Voltage Source and Power Supply Unit

Integrates a DC standard voltage source, four-wire low-level voltage source, and auxiliary power supply unit.

Range

Output Range

Minimum Resolution

Stability

Tcal±5°C

1-hour

Absolute Measurement Uncertainty

(k=2) Tcal±5°C

1-year

Maximum Load Current

Ripple Factor

( % )

Class 0.02

Class 0.05

Class

0.02

Class

0.05

±( μV/V of output + μV/V of range )

100 mV

± (0 ~ 120.000 0) mV

0.1 μV

TBD

TBD

TBD

120 + 80

50 mA

< 0.2

300 mV

± (0 ~ 360.000 0) mV

0.1 μV

TBD

TBD

TBD

120 + 80

100 mA

< 0.2

1 V

± (0 ~ 1.200 000) V

1 μV

14 + 6

30 + 10

80 + 20

120 + 80

150 mA

< 0.2

3 V

± (0 ~ 3.600 000) V

1 μV

14 + 6

30 + 10

80 + 20

120 + 80

150 mA

< 0.2

10 V

± (0 ~ 12.000 00) V

10 μV

14 + 6

30 + 10

80 + 20

120 + 80

150 mA

< 0.2

30 V

5.000 00 V ~ 36.000 00 V

10 μV

14 + 6

30 + 10

80 + 20

120 + 80

80 mA

< 0.2

100 V

20.000 0 V ~ 120.000 0 V

0.1 mV

14 + 6

30 + 10

80 + 20

120 + 80

80 mA

< 0.2

300 V

50.000 0 V ~ 360.000 0 V

0.1 mV

14 + 6

30 + 10

80 + 20

120 + 80

60 mA

< 0.2

1000 V

200.000 V ~ 1 550.000 V

1 mV

14 + 6

30 + 10

80 + 20

120 + 80

15 mA

< 0.2

Supports Automatic or Manual Range Switching: Display resolution: 6½ digits.

Stabilization Time: ≤ 2 s; an additional 1 s is required during range switching.

Protection Functions: Short-circuit protection and overload protection.

Range

Output Range

Minimum Resolution

Stability

Tcal±5°C

1-hour

Absolute Measurement Uncertainty

(k=2) Tcal±5°C

1-year

Maximum Load Current

Ripple Factor ( % )

Class 0.02

Class 0.05

Class 0.02

Class

0.05

±( μA/A of output + μA/A of range )

100 μA

± (0 ~ 120.000 0) μA

0.1 nA

TBD

TBD

TBD

TBD

10 V

< 0.2

300 μA

± (0 ~ 360.000 0) μA

0.1 nA

TBD

TBD

TBD

TBD

10 V

< 0.2

1 mA

± (0 ~ 1.200 000) mA

1 nA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

3 mA

± (0 ~ 3.600 000) mA

1 nA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

10 mA

± (0 ~ 12.000 00) mA

10 nA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

30 mA

± (0 ~ 36.000 00) mA

10 nA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

100 mA

± (0 ~ 120.000 0) mA

0.1 μA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

300 mA

0 ~ 360.000 0 mA

0.1 μA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

1 A

0 ~ 1.200 000 A

1 μA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

3 A

0 ~ 3.600 000 A

1 μA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

10 A

0 ~ 12.000 00 A

10 μA

14 + 6

30 + 10

80 + 20

120 + 80

10 V

< 0.2

30 A

0 ~ 36.000 00 A

10 μA

14 + 6

30 + 10

80 + 20

120 + 80

5 V

< 0.2

100 A

0 ~ 120.000 0 A

0.1 mA

14 + 6

30 + 10

80 + 20

120 + 80

5 V

< 0.2

500 A

0 ~ 600.000 0 A

0.1 mA

14 + 6

30 + 10

80 + 20

120 + 80

2 V

< 0.2

N*500 A

0 ~ N * 550.000 A

1 mA

14 + 6

30 + 10

80 + 20

120 + 80

2 V

< 0.2

Supports Automatic or Manual Range Switching: Display resolution: 6½ digits.

Stabilization Time: ≤ 2 s; an additional 1 s is required during range switching.

Protection Functions: Short-circuit protection and overload protection.

DC Power/Energy

Output Range

Combination of DC Voltage and DC Current (or DC Low-Level Voltage)

Measurement Uncertainty

Sum of voltage measurement uncertainty and current measurement uncertainty (or DC low-level voltage measurement uncertainty)

Energy Pulse

Standard Energy Pulse Output

High-Frequency Full-Scale Value: Corresponds to 120 kHz

Pulse Output Frequency

Output Frequency Jitter Time: < 10 μs

Standard Energy Pulse Input

Signal Amplitude: 5 V, TTL level; capable of directly receiving optical energy pulses from the meter under test

F_H=120 kHz × Power ÷ Voltage Range ÷ Current Range

F_L=120 kHz × Power ÷ Voltage Range ÷ Current Range ÷ 10000

Energy Error Display

Automatic display with a resolution of 0.0001%

Second Signal Measurement

Pulse signal input: Square wave, amplitude 0–5 V_pk

Measurement range: 0.1 Hz ~ 1 MHz

Annual measurement uncertainty (k = 2): 2.0×10^-7

Standard Second Signal Output

Frequency: Standard 1 Hz reference signal

Annual measurement uncertainty: 2.0×10^-7

Input level: ≤ 5 V

Clock

Satellite time synchronization with real-time clock display

Daily timing error supports two display formats: s/d and ppm/ppb.

DC Power Output

Output Voltage

+(5 ~ 48) V

Maximum Load Capacity

5 W / meter position

AC Power Output

Output Voltage

220 V

Maximum Load Capacity

≥5W / meter position

Note: Other types of power supply can be customized.

Power Supply

Three-phase five-wire, 305 - 460 Vac，47 Hz~63 Hz

Maximum Power Consumption

①Measurement & Control Main Unit

Power Consumption 1500 VA

②Wiring Bench

(including DC Voltage Source and Power Supply Unit)

Power Consumption 100 VA/ Meter Position

③Current Range Extender

550 A per module; power consumption: 1.6 kVA per module (3.2 kVA per module optional)

Total Power Consumption =①+②+③

(Taking 1.6 kVA per 550 A module as an example)

Example: If two current range extenders are selected (maximum current output: 1.1 kA) with a 6-position bench:

Total power consumption = 1500 VA + 6 × 100 VA + 2 × 1.6 kVA = 5.3 kVA

Warm-up Time

30 minutes

Temperature Performance

Operating temperature: 5°C~45°C; Storage temperature: -10°C~55°C;

Calibration temperature: (cal = 23 ± 2 °C)

Humidity

Performance

Operating humidity: < 80% @ 30°C, < 70% @ 40°C, < 40% @ 50°C;

Storage humidity: (20%~80%) R·H, non-condensing.

Communication Interface

LAN×1, RS232×1, USB×1