How do you measure high-frequency current?
The amplitude ranges from 1 up to 1000 A at frequenc~es of up to 1 MHz, with rise-times as low as 50 ns. The general method of measuring pulses is to convert the current into a voltage, either with the aid of a shunt-resistor (Ohm’s law:V=I.R), or with the aid of a current coil.
Which type of ammeter is used to measure high frequency current?
Thermocouple-type ammeters
Thermocouple-type ammeters for use at very high frequencies.
Can potentiometer measure resistance?
The DC potentiometer method of measurement of resistance is used for measuring the unknown resistance of low value. The voltage drop across the known and unknown resistance is measured and by comparison the value of known resistance is determined. …
Why is the HF current probe so important?
In this case, lowering the harmonic content (by slowing the digital rise/fall-times) or diverting/blocking the CM current is very important in limiting radiated emissions. The RF current probe is an “inserted-primary” type of radio frequency current transformer.
How to measure high frequency current signals [ video ]?
How to measure high frequency current signals? I have an application where I need to measure current signals with frequency 2 MHz to 5 MHz. The current signal variation will be in the order of few micro Amperes. Can anyone suggest an idea to tackle this problem??
What is the transfer impedance of a Fischer f-33-1 probe?
Then, The Fischer F-33-1 probe is a commonly used troubleshooting tool and has a flat frequency response from 2 to 250 MHz (Figure 6). The transfer impedance is about 5Ω (approximately +14 dBΩ on the graph), therefore, a 1 uA current will produce a 5 uV output voltage from the current probe.
How to calculate the IC of a RF probe?
The x-axis is frequency, while the y-axis is dBΩ. Use this to calculate the value of IC (Equation 2), given the measured voltage at the probe terminals (VdBuV) and ZT. The accurate calibration of RF current probes is a complex process. Characterization is a more correct term to use than calibration.