METRAVI PRO 476 Digital T-RMS AC-DC Clamp Meter User Manual

Digital T-RMS AC/DC Clamp Meter
PRO 476

INTRODUCTION

The Metravi PRO 476 T-RMS AC/DC Clamp Meter is an advanced device, especially designed for high-voltage photovoltaic environments. It offers exceptional accuracy and performance, with a wide range of features.
With its automatic range selection, T-RMS measurements and a clear display capable of showing up to 9999 digits, this clamp meter allows for precise measurements of AC/DC Voltage, Current, Low-pass Filtered Voltage/Current, Surge Current, Peak Current, DC Power (using an external flexible clamp head), Resistance, Circuit Continuity, Diodes, Capacitance, and Temperature.
Its versatility extends beyond Photovoltaic applications, as it can also be used in other high-voltage settings like energy storage systems, uninterrupted power supplies (UPS), and large motors.

FEATURES

• Measure 2500V DC, 1000A DC & DC Power 2000kW
• Measure 1500V AC, 1000A AC
• External Flex Clamp (optional) can measure up to 3000A AC
• Low Pass Filter
• AC Inrush Current & Peak Value (PEAK) measurement
• Dual Display to show Voltage/Frequency or Current/Frequency or DC
• Voltage/DC Current or DC Power/DC Current on the same screen
• Temperature measurement (contact K-type)
• Data Logging
• 35mm Ultra-thin Jaws – ideal for inverter or combiner box
• Solar Panel Polarity indication: when <-10 DCV
• Audible & Visual Alarm
• Bluetooth App for Android & iOS: enables remote control & monitoring using Smartphone App
• Auto backlight & Auto power-off
• Certifications: CE, RoHS, cETLus
• Safety rating: CAT III 1500V/ CAT IV 600V
• Protection IP65 makes it ideal for outdoor use, especially for Solar Arrays, Wind Energy Systems, etc.

TECHNICAL SPECIFICATIONS

Accuracy: ± (a% of rdg. + b dgt.); guaranteed fot 1 year Ambient temperature and humidity: 23°C±5°C; ≤80% RH Temperature coefficient: The temperature condition to ensure accuracy is 18°C~28°C. The fluctucation range of ambient temperature keeps within ±1°C. If the temperature is <18°C or >28°C, the additional error of temperature coefficient is “0.1 x (specified accuracy) / °C

Polarity Indication
If the voltage is below -10V DC, the system activates a series of indicators:
The red LED will flash for a period of 10 seconds, accompanied by buzzing.
Additionally, the LCD screen will display the “POLARITY” symbol, alerting the user to the reversed probe.

AC Voltage ACV

AC Voltage ACV-LPF

• Input impedance: About 2 MΩ

• Frequency response (ACV): 40~1000 Hz (Display: True RMS)

• Accuracy guarantee range:
  ACV: 1%~100% of range
  ACV: 10%~100% of range

• Add an error for the AC crest factor of non-sine wave
  a) Add 3% for crest factor of 1~2
  b) Add 5% for crest factor of 2~2.5
  c) Add 7% for crest factor of 2.5~3

• If frequency is displayed on the sub-display, then the input amplitude shall meet the requirements as: 5 Hz~100 Hz: ≥5 V, 100 Hz~999.9Hz: ≥10 V

DC Voltage DCV, DCmV

• Accuracy guarantee range: 1~100% of range
• Input impedance:
  DCV: About 2 MΩ, DCmmV: About 10 MΩ

DC Current DCA

• Press the zero button to zero the reading before measurement.
• Please perform measurement at the center of the clamp jaws. An error of 1% is added if deviated from the center.
• Accuracy guarantee range: 1~100% of range.

AC Current ACA

AC Current ACA_LPF

• RMS of sine wave

• Accuracy guarantee range:
  ACA: 1%~100% of range, ACA_LPF: 10~100% of range

• AC crest factor (50/60HZ):
  2.5 (At 600.0A), 3.0 (At 500.0A), 1.42 (At 999.9A)
  Add an error for the crest factor of non-sine wave:
  a) Add 4% for crest factor of 1~2
  b) Add 5% for crest factor of 2~2.5
  c) Add 7% for crest factor of 2.5~3

• Please perform measurement at the center of the clamp jaws. An error of 1% is added if deviated from the center.

• If frequency is displayed on the sub-display, then the input amplitude shall meet the requirements below: 5 Hz~10Hz: ≥10 A, 10 Hz~100Hz: ≥5 A, 100 Hz~999.9Hz: ≥10 A

• 3db frequency (ACA_LPF): About 1.2 KHz

DC Power VA

1000A AC/DC
2500kVA| 1kVA

• Precision range: 5~100% of range

Ultra-thin Clamp Head:
35mm ultra-thin clamp head is designed for narrow gaps in the combiner or inverter and other tight spaces and crowded environments.

Flex Current Sensor CSA ACV

1500V AC
300.0A| 0.1A
3000A| 1A

Flex Current Sensor CSA_LPF

1500V AC
300.0A| 0.1A
3000A| 1A

• Frequency response (CSA): 45Hz~5500Hz (The frequency response refers to the intrinsic frequency response of PRO 476)
• 30.00A: 1A = 100mV (AC): 300.0A: 1A = 10mV (AC): 3000A: 1A = 1mV (AC).
• The specified accuracy at this measurement position is the intrinsic accuracy of PRO 476 ( eliminate the error of flex current sensor).
• CSA_LPF: 10~100% of range
• 3db frequency (CSA_LPF): About 1.2 KHz

Resistance (Ω)

• Precision range: 1~100% of range
• For continuity test at 999.9Ω, fast response cannot be achieved. For resistance ≤30Ω, continuous sound is generated and green backlight is lit up. For resistance ≥50Ω, no sound is made.

Diode

• Open-circuit voltage: About 3V
• Residual reading under short-circuit condition: ≤3 digits

External Clamp Sensor:
AC current measurement range can expand to 3000A with the flex clamp sensor and it also makes it easy to take measurements in narrow spaces.

Capacitance

• Residual reading under open-circuit condition: ≤5 digits
• Measured value = Displayed value – Residual reading
• Precision range: 5~100% of range

Temperature

• Equipped with Type K (NiCr~NiSi) thermocouple
• Open-circuit indication: OL
• Short-circuit indication: Ambient temperature
• If each ambient temperature difference of the Clamp Meter reaches ±5°C, the accuracy can be adopted after 1 hour.

Table of Auto Hold Function

Table of Auto HOLD Function

Function| Threshold| Fluctuation range/Increment
ACV| 10V| 2V
DCV| 10V| 2V
Ω| 99.99KΩ| 2.0Ω/20Ω/0.2KΩ
CAP| 10μF| 2μF
DCA| 10A| 2A
ACA

(Clamp Jaw)

|

10A

|

2A

CSA| 1A/10A/100A| 0.2A/2A/2A
VA| 10KVA| 2.0KVA

Bluetooth APP:
By utilising the Bluetooth app, user can conveniently record the testing results and measurement details.
Moreover, the testing reports and data can be effortlessly transferred and shared with your colleagues or team members.

GENERAL SPECIFICATIONS

45%RH
Storage Environment| : -20°C to 60°C, ≤ 80%RH
Operating Altitude| : 2000 mtrs
Electromagnetic Capability| : In an RF field of 1V/m2, total accuracy = specified accuracy + 5% of
range. In RF filed > 1V/m2, there are no specifications
Interface| : Bluetooth
Software| : Free App for iOS and Android
Zero / REL Key| : Available
Accessories| : Test Leads, K-type Thermocouple, Batteries, User Manual

METRAVI INSTRUMENTS PVT. LTD.
Kolkata, India
www.metravi.com

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