Oscilloscope Differential Probe Selection

Oscilloscope differential probes are primarily used to observe differential signals. Differential signals are signals that are referenced to each other rather than to ground. Although differential signals can also be tested using paired single-ended probes, differential probes offer improved performance: high CMRR, wide frequency range, and minimal time offset between inputs. The differential signal of a differential probe transmits data over two complementary lines, where a pair of signals is transmitted simultaneously to a receiver and then subtracted to obtain the original signal. Differential signals are becoming more common as rates increase. Differential signals eliminate common-mode noise, reduce the need for a common reference voltage between the transmitter and receiver (against which the signal is usually compared to determine the logic level), and eliminate certain signal integrity issues such as "ground bounce".

Features of oscilloscope differential probes
1, the voltage limit to the smallest DC + peakAC and RMS value shall prevail;

2, when the group, the battery can work more than 6 hours, charging only 2 hours;

4, charger operating voltage: 220V ± 10% (50Hz or 60Hz);

5, the charger is charging, the indicator light is red, full or not connected to the green;

6, the probe can be charged at the same time when working. Charging at work, the signal output will increase the noise, in the case of high precision requirements for signal measurement is recommended to use the probe without charging, the probe's signal indicators are referred to in the non-charging.

Oscilloscope differential probe selection
Users of wide bandwidth oscilloscopes and active probes also need to choose between single-ended probes and differential probes. Single-ended probes measure the reference voltage of a signal to "ground", whereas differential probes are required to measure the relative voltage difference between two signals (independent of the ground plane), which are generally positive and negative voltages 180 degrees out of phase. In essence, single-ended probe is also a special kind of differential probe, because the measurement is the relative potential difference between the signal and the ground plane, so theoretically the user can also buy only differential probes to cover all the differential signals and single-ended signals measurement needs, but a variety of factors and constraints on the possibility of single-ended probes, compared with the differential probe is more expensive, the use of the more unsympathetic, and requires additional x100x200x500x1000

Maximum operating voltage ≤ ±650V at x100

(DC+ACpeak) ≤±1300V at x200

(DC+ACpeak) x200 ≤±1300V x500 ≤±3250V

(DC+ACpeak) ≤±6500V at x1000

Maximum input differential voltage

(DifferentialVoltage)6500V(DC+ACpeak)

Common Mode Reciprocity Ratio (CMRR) 60Hz:>10,000:1

100Hz:>1000:1

1MHz:>300:1

Noise ≤2mVrms(50Ωload)

Impedance 54M/ 1.3pF (between terminals)

27M Ω//2.5pF (single-ended to ground impedance)