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 power meter, energy meter, 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
- Less than 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, 60-630 V @ 60Hz 150 VA rating per phase |
3.2 | Current | 1mA to 200A, 150 VA rating per phase |
3.3 | Frequency | 47-68 Hz (fundamental) |
3.4. | Phase angle | 0 to 360° (0.00001 degree increaments) |
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 √Year Current ±3 ppm√ Year Power ±4 ppm√ 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