Calibration with the specified mechanical calibration requires three loads: open, short and load.The calibration data is saved as user calibration data. It can be saved to status 0 and can be automatically loaded at the next power'on. It can be saved to status 1-4 and can be loaded via the RECALL menu. Usually the user has only one set of calibration loads for port 0. When there is only one load calibration piece, simply connect the loadcalibration piece. To port 1, port 0 remains open and then press ISOLN tocalibrate. The pass-through calibration for port 1 requires only the RF cableto be used to connect port 0 and port 1 and then press the THRU menu tocalibrate.After the calibration is completed, press the DONE button to pop up thesave interface to select the desired state for saving.After the calibration is completed, you can connect the three calibration pieces to port 0 again.Check whether the calibration is correct through the SMITH diagram. The correct calibration should be: when the connection is open, the curve should be concentrated on the far right side of the SMITH circle. When the connection is short, The curves should all be centered on the leftmost side of the SMITH circle. When connecting LOAD, the curves should be concentrated in the middle of the SMITH circle. Connect port 0 and port 1 using an RF cable and see that the S21 curve error should not exceed 0.5 dB. C Each character shown below indicates that the following calibration term has been
applied:D: Direction,R: Reflection Tracking,S: Source Match,T: Transmission Tracking,X: Isolation,C* Note: nanoVNA_300_4ch.dfu
Select the display channel and display type:
Through the menu's DISPLAY?TRACE item, you can choose to open or close the corresponding display channel.The color of the channel is the same as the color of the interface curve. The display channel of the last operation is the active tracking channel.
? Flexibile Mold Change:You can change the display format and channel selection at any time. In the normal test mode, tap the right area of the screen or press the dial switch to call up the menu.Tap the screen or turn the wheel switch to select a menu item
? Technical Data: Display: 2.8 inch TFT (320 x240) // Power supply: built-in lithium battery // Measurement range: 50KHz-900MHz (default firmware) // RF output: -13dbm (maximum -9dbm). There are also have another simillar vector in our shop,warmth welcome to visit and choose !
? Calibration with the specified mechanical calibration requires three loads: open, short and load.The calibration data is saved as user calibration data. It can be saved to status 0 and can be automatically loaded at the next power on. It can be saved to status 1-4 and can be loaded via the RECALL menu
? Full Set Of Accessories: Main unit / 1 set, 3 SMA male calibration parts Set the frequency range (STIMULUS>START/STOP or CENTER/SPAN)
? Warmth Saying:This project aim to provide an RF gadget but useful instrument for enthusiast.The default firmware main function is used for antenna performance measurement. If you need more test functions, please update the firmware to "nanoVNA_900_4ch.dfu".By the way,both firmwares have the above C* functions. The factory default firmware cancels this feature!