|
Could it be a configuration setting?
FWIW these are the settings I used in myVNA (unfortunately it keeps license-locking-up on me, it always thinks my laptop hardware has changed, so I'm struggling to use that. Maybe photos of the board and setup are needed, to see if anything can be visually spotted. Coax Connections ??????VNA??? RF-IV Sensor ??????RF OUT????? RF IN ??????PORT 1??? OUT ??????PORT 22???? N/A VNA Hardware ??????Parameter??? Value ??????Hardware Type????? N2PK VNA ??????Configure the hardware?? ??????Transmission ADC?? ADC2 ??????Reflection ADC???? ADC1 ??????Clock Frequency (MHz)??? 156.25 ??????Minimum Frequency? 0.05 ??????Maximum Frequency? 60 ??????ADC Voltage conv. factor? 1.6463612727 ??????Hardware Interface?????? USB ??????Choose CDS/Harmonic Mode?? Harmonic Suppression Mode ??????Harmonic ??? Fundamental ??????Samples????? 4 (CDS) ??????Set RF-IV Configuration? ADC1 is used for V and I ??????Switch setting whilst reading V?????Switch Line 0 goes High ??????Reload Z0 with Calibration Data?????Checked ??????Load DDS during ADC????? Checked ??????Swap Detectors on Reverse Scan??????Checked ??????Power Down DDS when Idle??? Checked ???????????? Instrument Mode ??????Parameter???Value ??????Dual Detector Trans/Refl??????Checked ??????Use RF-IV Mode????Checked ???????????? Calibration ??????Parameter??? Value ??????Use Separate Isolation Avg????Checked ??????5 Term Calibration?????? Checked ???????????? Switches and Attenuators ??????Parameter??? Value ??????Attenuator 0?????Checked ________________________________ From: [email protected] <[email protected]> on behalf of Jerry <jerry@...> Sent: 29 January 2024 17:30 To: [email protected] <[email protected]> Subject: Re: [N2PK-VNA] RFIV vs bridge I have a 1.020K .01% resistor and when I try to measure it with RFIV calibrated with 50ohms it seems to be all over the place. I have to keep working with it I guess. And I need to find the darn top for the unit. |
