| Products > Test Equipment |
| UNI-T UT89XE: 20000 manual ranging counts of pure fun - impressions & teardown |
| << < (3/6) > >> |
| Avelino Sampaio:
Raising the RMS voltage to 100mV, the frequency range increased to 110Khz(-3db). This is very similar to AD736's answers. Note: The RMS converter used is ES5 from Cyrustek. |
| Avelino Sampaio:
As for the frequency meter, below is a table with minimum peak to peak voltage values, to obtain error-free readings. up to 160khz -------------- 230mVpp from 161 to 400khz ------ 250mVpp from 401 to 700khz ------ 270mVpp from 701 to 1.2Mhz ------ 290mVpp from 1.2 to 2.7Mhz ------- 310mVpp from 2.7 to 17.8MHz ---- 330mVpp from 17.8 to 18.2Mhz --- 350mVpp from 18.2 to 18.6Mhz --- 370mVpp from 18.6 to 19Mhz ----- 390mVpp from 19 to 19.3Mhz ------ 410mVpp ... at 24Mhz (maximum generator) --- 780mVpp Note in the image the reading error with the value below 230mVpp |
| Gyro:
--- Quote from: Andrew_Debbie on July 01, 2021, 02:11:22 pm ---Slot in the PCB too. --- End quote --- I can't work out what a slot in that position is actually achieving, there's no issue with creepage there. ??? |
| Avelino Sampaio:
Follow the link of the DMM-Chipset datasheet: ES289B. There is a good example circuit to study, see in the image. |
| Avelino Sampaio:
In the range of 2v (higher resolution) the RMS accuracy is very good, in the limits of the effective region of the meter (45~400Hz). Image 1: generator set at 1v RMS, 45Hz, sine. image 2: frequency set to 400Hz, with good RMS accuracy image 3: at 9.3Khz drop to -3db. |
| Navigation |
| Message Index |
| Next page |
| Previous page |