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Circuit Description
R&S ESH2-Z3
4 Circuit Description
Electrical Function
(See circuit diagram 349.7099 S)
The Passive Probe is designed to comply with CISPR Publication 16-1-2 in conjunction with IEC 61010-
1 and thus includes a Y-capacitor to decouple it from any AC supply voltages which may be present in
the equipment under test.
The voltage attenuation is determined by the relation of R1 and R2 in parallel with Ri (Ri = 50
receiver input impedance). For high-precision measurements, the RF input attenuation of the receiver
should be >10 dB. The typical additional error resulting from the deviation of the receiver input
impedance with the RF attenuation switched off is less than 1.5 dB. The frequency response is flat up to
30 MHz due to the probe tip capacitance to ground and the capacitance of the RF cable having a
defined length. Therefore, type and length of the RF cable must not be changed.
The attenuator contains a 1470
resistor which is provided to double the probe input impedance.
1156.6124.32
10
E-1
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