Adjustments
52 P6330 3.5 GHz Differential Probe Instruction Manual
12.Cal culate the common-mode gain (ACM) asfollows:
(Vout1--V
out2)÷(Vin1--V
in2).
13.Calculate the CMRR as follows:20 log (0.2/|ACM|)
14.Reve rify that the offset is 0V, ±3.0 mV(repeatsteps1
through 3). If the offset voltage magnitude is greater than 3.0 mV,
or if the CMRR is less than 60 dB, disconnect the probe from the
test circuit. Repeat the procedure, beginning with step 1 on
page50,tocompensate for the adjustmentinteraction.