CONFIRMED !!!
LCR Pro1 is the chinese clone of the genuine st5s .
We, LCR Research, are a Canadian company proudly based in Toronto, Ontario. All research, development and manufacturing is also done in Canada. The LCR Pro1 provides 0.1% basic accuracy, 100kHz testing frequency, 2x larger display and wider measurement range. We are not “
the Chinese clone of the genuine st5s”.
This conclusion that "
the 100Khz frequency is virtually useless" is based on limited information. Here are some technical details to clarify the 100kHz performance question:
For 100kHz sinusoidal signal generation, the microprocessor’s DAC generate 10 points per period. Also, the DAC has 12-bit resolution and very stable time base set by 16MHz 10ppm crystal. The resulting signal has a THD (Total harmonics distortion) value less than 11%. To further reduce THD we use the 3-rd order low pass filter (not a 2-nd order one). This filter attenuates distortion by -60dB resulting in total THD value of less than 0.02%. This is more than enough to be used as an excitation signal in accurate LCR measurement.
For the 100kHz sinusoidal signal processing we are doing 16 (not "
8") samples per period. The 16 samples are used in generic formulas to calculate voltage and current amplitude and a relative phase shift. The 8 averaging samples are used to further improve accuracy. The proprietary software algorithms are used to enhance accuracy and measurement stability across full measurement range.
Regarding the 100KHz performance, please check out the attached pictures. The LCR Pro1 can measure small inductance in 100nH range accurately with 100KHz. This is not something a 10KHz device can do.
If you have any questions about our products, please contact us directly at sales@lcrresearch.com.