Ultra High Precision Calibration System

Application

Currently, class 0.02 (three phase) is calibrated by using class 0.01 (three phase) standard, and class 0.01 standard are just compared against class 0.01 or sent to international laboratory. Such outside calibration/comparison is a costly and time consuming affair without great benefit in improving measurement uncertainty (CMC), which is highly desirable by an accredited laboratory.

The RS933 is suitable for

  • Calibration of high precision three phase reference standard class 0.01,
  • Calibration of powermeter, energymeter, power quality meter with extreme accuracy and precision
  • maintaining the traceability easily by using RD22 the primary transfer standard

Advantage

  • Wide current range 1 mA to 200 A from one output
  • Automated testing of 8 /16 meters
  • Unlimited waveform using built-in Arb function
  • GPS Time synchronization pass through
  • Efficient calibration using RD22
  • < 50 ppm Energy Accuracy

Technical specification of  RS-933

S.no

Particulars

Technical details

1.        

System suitable for calibration

For three phase reference standard class 0.01

2.        

Power Supply

240V, 30A, 48-62Hz

3.        

Output range

 

3.1.

Voltage

60-525 V @50Hz, 150 VA rating per phase

60-630 V @60Hz

3.2

Current

1mA to 200A, 150 VA rating per phase

3.3

Frequency

47-68Hz (fundamental)

3.4.

Phase angle

0 to 360°

4

Total expanded uncertainty

Traceability to NIST for fundamental waveform. The accuracy specs are valid for entire voltage and current range with in temperature operating range 23 ± 5°C. Accuracy also includes stability, power factor , test system error and total measurement uncertainty. The specs are based on very conservative approach

4.1

Voltage

±43 PPM

4.2

Current

±63 PPM

4.3

Phase angle

±0.003°

4.4

Power

±50 PPM (at Power factor 0.5 ind-1-0.5 Cap))

5

Temp Coeff.

1 PPM/°C (need to be consider when operating out of operating temp range)

6

Stability under typical load

Voltage ±32 PPM,

Current ±44 PPM,

Power ±35 PPM

7

Pulse input constant range of DUT

1x10-11 to 9x10+11

8

Pulse input

Voltage high >+1.6V, Voltage low <+1.4V,

Maximum frequency <4MHz

Minimum Frequency 2 micro Hertz

9

Recommended Recalibration interval

2 years

10

Wh/hr 30 day Stability

10 ppm

11

Calibration of the system

Using RD-22 Energy Transfer Standard

12

Communication

10/100 Ethernet port

Technical Specification of Transfer standard RD-22

S.no

Particulars

Technical details

1.        

Used to transfer the Energy traceability from the primary reference to the 933

Power/energy automated calibration system for RS-933, to transfer uncertainty from NMI to lab

2.        

Isolated Power Supply

Auxiliary power input 120V or 240V

Auxiliary power input 24V DC

3.        

Measurement Range

 

3.1.

Voltage

60-600 V @50Hz,

3.2

Current

0.2 to 200A (125A version is also available)

3.3

Frequency

45-65 Hz

3.4.

Phase angle

0 to 360°

4

Accuracy

Traceability to NIST for fundamental waveform. The accuracy specs are valid for entire voltage and current range with in temperature operating range 23 ± 2°C. Accuracy also includes stability, power factor , test system error and total measurement uncertainty. The specs are based on very conservative approach

4.1

Voltage

±30 ppm

4.2

Current

±40 ppm

4.3

Phase angle

0.003°

4.4

Power

±50 PPM (same is valid for 60°Ind/cap)

5

Temp Coeff.

1 PPM/°C

6

Stability under typical load

Voltage ±2 PPM/Root Year

Current ±3 PPM/Root Year

Power ±4 PPM/Root Year

7

Pulse input port

BNC with 150 ohms pull up to 5 V, clamped at 5.7V

Gate Rate 200nS pulse width minimum, maximum 20Hz repletion rate

8

Pulse output Port

Type BNC open collector, clamped at 27V, 50mA Max

Frequency Max 2.1 MHz (minimum pulse width 200nS)

Metrics selectable Wh, VArh, Vah

Pulse value programmable ( 0.0001Wh/pulse default)

9

BNC Port (3)

For 3 phase sync or analog sense

10

Display

Back lit 4x 16 character LCD display

11

Buttons

5 membrane button keypad

Up/down/esc-reset/enter/mode

12

Recommended Recalibration interval

2 year Calibrate before use (the device is a transfer Std. and will be sent to NMI before being used to cal 933,

13

Wh/hr 30 day Stability

6 ppm

14

Calibration of the system

At the NMI

15

Communication

8 pin RJ45 jack for RS 232 communication

Note:- Technical specs are subject to alteration without prior information