The difference between 1MΩ impedance and 50Ω impedance is that the starting point of 1MΩ impedance is to enable hybrid combiner din-female to have a small load effect and be a "quiet" bystander, while 50Ω gear is to eliminate signal reflection on the transmission line and minimize the influence of the transmission line.
How to select impedance gear?
1. When the measured signal is a no-load signal (such as a signal generator) and hybrid combiner din-female is connected with a 50Ω characteristic impedance coaxial cable, the 50Ω impedance gear needs to be used.
2, when the measured signal is an onboard signal, has its own complete terminal receiving system, it needs to use 1MΩ impedance gear measurement directly or use the probe measurement.
3, with the probe measurement, need to pay attention to the passive probe need to use 1MΩ impedance gear, active probe needs to match according to the probe requirements, generally speaking, high frequency probe requires 50Ω impedance gear, low frequency probe requires 1MΩ impedance gear.
4. When using passive probes, note that 1:1 probes usually have only 6MHz bandwidth. For higher frequencies, a passive probe with attenuation is needed.
When hybrid combiner din-female provides both 50 ohm input and 1 meghm input, how to select the appropriate input coupling depends on the accuracy of the measurement result. The following are our suggestions for hybrid combiner din-female coupling input selection:
When using a 10X probe, select 1M ohm input
When hybrid combiner din-female is used with a 10x probe, the only option is a 1 megohm input and no other.
If the signal bandwidth to be measured is less than 200 MHz, the 10x probe is a very suitable universal probe. The disadvantage of the 10x probe is that it reduces the signal to noise ratio by 20 dB because it attenuates the signal by a factor of 10.
For a 12-bit high-resolution hybrid combiner din-female, the input noise peak value is about 1 mV. The maximum vertical sensitivity that the 10x probe can provide is 10 mV/div. If you want to measure low-level signals less than 100 mV, the 10x probe will limit the vertical sensitivity of hybrid combiner din-female. In this case, consider using a direct connection or active probe.
hybrid combiner din-female https://www.cenrf.com/Hybrid-Combiner-4in-4out-698-2700MHz-DIN-Female.html