kVp/mAs Meter: Model 820

Multi-Function X-ray Meter

kVp meter

This Instrument Measures
kVp, mA, mAs and Exposure Time

The 820 kVp / mAs Meter combines all the features of our Model 815 kVp Meter, and adds the mA and mAs measurement function in one compact unit. The 820 is capable of measuring kVp, mA, mAs, and exposure time. The unit is self resetting, and automatically detects AC or DC x-ray currents, minimizing the possibility of inaccurate readings. With each mA reading, the unit stores and displays mA, mAs and exposure time. mA is sampled for a representative length of time and saved. This allows shorter exposure times minimizing xray exposure and wear and tear on the x-ray head. The Model 820 contains exactly the same kVp measurement circuit and capability as our Model 815. The mA / mAs function has been squeezed into the unit. The Model 820 is battery operated, user-friendly, and has a two year warranty. Applications include verification of peak x-ray voltage, constancy checks, calibration of x-rays, and quality assurance measurement of exposure time. The unit is also used for half value layer determination, troubleshooting and repair of x-rays, and quality control.

The cable supplied with the unit serves as a switch. When the cable is plugged into the unit, it is automatically configured for mA readings. When the cable is unplugged the Model 820 functions as a kVp meter.

The kVp Meter has CE Compliance.

All units come with a Certificate of Calibration. Yearly calibration is suggested.

The introduction of the Model 820 allows service personnel to carry one instrument rather than an mAs Meter and a kVp Meter.

New Improved Instrument

New Design Improvements to the Model 820 include the following:

Remote Readout

kVp meter

The all new model 820 is now capable of transmitting data to an Android device via a bluetooth connection. Go to the Google Play store on your smartphone and search for ECC 820/815: Remote Monitor. Use this app to connect to your Model 820 and the readings will be sent directly to your phone's display.

New X-ray Detectors

The Model 820 has been redesigned to use a new x-ray detector. The new detectors are more stable, more repeatable and have greater range than the previous versions. The measurement range is now 40 to 125 kV.

New Software Operating System

Improvements have been made in the internal microcomputer program that facilitates faster measurements. There is no minimum exposure time requirement for mA / mAs measurement. The mA and mAs measurements are more accurate because we are measuring the current for the entire x-ray exposure.The minimum exposure time needed for kVp measurements has been reduced to 40 ms (0.04 second). This allows more flexibility when the x-ray is set up based on mAs rather than exposure time. This new feature virtually eliminates sources of error when certain techniques result in short exposure times. The shorter exposure times also give you less wear and tear on x-ray equipment as well as less x-ray exposure to test personnel.

This is a software only change, therefore we will be able to retrofit any instruments that are sent to us for calibration.


  • Combines two instruments
    • kVp and mAs in one package
  • Easy to use
  • No need to set for AC / DC
  • Self-resetting
  • mA is stored permitting short exposures
  • Measures kVp and exposure time simultaneously
  • kVp is noninvasive
  • AC and DC x-rays
  • High accuracy
  • Measures kVp, mA, mAS, exposure time
  • Battery operated
  • Two year warranty
  • Compact size
  • Durable ABS plastic case
  • Custom carrying case option
  • New! Send data to smart phone via Bluetooth

Typical Applications

  • Measurement of exposure
  • Verification of peak x-ray voltage
  • Constancy checks
  • X-ray calibration
  • Quality assurance
  • Measurement of X-ray exposure time
  • Half Value Layer determination
  • Troubleshooting and repair of X-rays

kVp/mAs Meter photo

Carrying Case

A new accessory is now avalable for models 815 and 820 - Custom Hard Carrying Case, that keeps your instrument safe and has room for cables and batteries inside.


Additional Information

To learn more, please review:

kVp Specifications (applies to 815 and 820)

  • 815/820: 45 to 125 kV
  • 815L/820L: 40 to 120 kV
  • 2% 1 kV, at 10 to 100 mA for 815
  • 18 to 42 cm from head, for Tungsten target x-ray tube with 1.5 mm Al equivalent filtration
  • 1% 2 millisecond (1/5 to 2 sec)
  • Minimum exposure time is 40 milliseconds
  • 40 millisec - High Speed Mode (normal)
  • 80 millisec - High Resolution Mode
  • 7 mA at 50 kV, 10 cm from x-ray source
  • Also depends on focus / collimating
    kVp Meter photo

    mA / mAs Specifications for 820

    • 200 mA Full Scale
      • 0.1 mA Resolution (mA or mAs)
      • 10 Ohms Input Impedance
    • 2A Full Scale
      • 1 mA Resolution (mA or mAs)
      • 1 Ohm Input Impedance
    • Range selection via pushbutton at power on
    • 2% 1 mA on both ranges
    • Via 5 meter cable with two alligator clips
    • Connecting cable switches meter to mA /mAs

    General Specifications for 815 and 820

    • 0.4"(10.2mm) Liquid Crystal
    • 8 Character Alphanumeric
    • 4 AA Batteries accessible from bottom of case
    • Low Battery Indicator
    • 48 hours continuous
    • Typically 9 months of normal use
    • ON/OFF Switch - Illuminated push-button with green power-on indication
    • MODE Switch - Momentary push-button
    • 8 Character Liquid Crystal Display
    • 150 x 120 x 58.5 mm
    • 5.9 x 4.7 x 2.3 inches
    • 0.7 kG (1.5 lb)
    • Padded Cordura Carrying Case

      Please contact ECC for pricing and ordering information.