Specification

ADC

channels                                : 4
resolution                              : 16 bits (15 bits usable)
sample rate                             : 7812.5 Sa/second synchronous all channels

Display

resolution                              : 800 x 480 pixels IPS
control                                 : capacitive touch
update rate                             : up to 70 waveform updates/second, zero blind time
measurements                            : 1 update/second in background

Services

operating system                        : Raspberry Pi OS (32 bit Debian 12 'bookworm')
network                                 : Wifi
software update                         : OTA Github
time service                            : NTP server pool
remote access                           : SSH, VNC
measurement log file                    : 1 update/second, CSV format
file transfer                           : Wifi+SCP or Bluetooth
keyboard                                : Virtual on-screen or Bluetooth

Voltage

peak                                    : 450 V
accuracy                                : ± 1 % of reading
resolution                              : 0.1 V

Current

continuous                              : 3 A RMS
peak (full range)                       : 20 A
peak (low range)                        : 0.3 A
accuracy (full range)                   : ± 1 % of reading + 0.010 A
accuracy (low range)                    : ± 1 % of reading + 0.001 A
resolution                              : 0.001 A
shunt resistance thermal coefficient    : 50 ppm /degree C

Power, VAR and VA

continuous (230V systems)               : 650 VA
accuracy (full range)                   : ± 2 % of reading + 0.20 VA
accuracy (low range)                    : ± 2 % of reading + 0.01 VA
resolution                              : 0.01 VA

Earth leakage

peak                                    : 10 mA
accuracy                                : ± 3 % of reading + 0.020 mA
resolution                              : 0.001 mA

Frequency

accuracy                                : ± 0.005 Hz
resolution                              : 0.01 Hz

Power quality

power factor                            : ± 3 % of reading
crest factor                            : ± 3 % of reading
THD(v)                                  : ± 5 % of reading
THD(i)                                  : ± 5 % of reading
Harmonic coefficients                   : ± 3 % (h0 to h11), 5 % (h12 to h23), 20% (h24+) of reading

Notes:

1. Power quality (current) measurements are valid for RMS currents in the range 0.2-3.0 A (full range) and 0.005-0.2 A (low range).
2. There is a small offset current and apparent power due to noise in the current measurement channel. When taking low power measurements, this error can be minimised by using the 'low range' setting.
3. Earth leakage current measurements are calibrated for steady state conditions and the passive filter components normally encountered in a device-under-test. To protect the meter, transient and high frequency components of earth leakage currents are electrically suppressed with a common=mode filter. Consequently transient capture of earth-leakage current is not representative of typical field conditions.
4. There is an offset earth leakage measurement due to stray effects in the measurement circuit and capacitance in the measurement cable. The offset measurement can be found by unplugging the device-under-test.
5. The single-pole power switch on the power quality meter is suppressed with an RC snubber. The snubber passes a small amount of current: to isolate the device-under-test, you must unplug it.