Appendix A: Specifications
A–12 VX4101A MultiPaq Instrument User ManualTable A–30: Counter Specifications Terms
Term Description
Frequency Terms F Frequency of the signal being measured (F = 1/P).
FLFrequency of the leading (first) signal being measured.
FTFrequency of the trailing (second) signal being measured.
F1Frequency of the Channel 1 signal being measured.
F2Frequency of the Channel 2 signal being measured.
FnFrequency of the Numerator (Ratio Measurement).
FdFrequency of the Denominator (Ratio Measurement).
FVCO Frequency of the Universal Counter Voltage Controlled Oscillator time base.
(FVCO has been chosen so that it is not evenly divisible by 10 kHz, thereby
reducing the likelihood of aliasing.) It is calculated as follows:
(FVCO = 10e6 × 304.0/3.0)
Numeric Terms N Number of events in a measurement interval. For Auto-Averaging, N is the
greater of one or the number of events in a 100 ms interval.
N1Number of events in a leading (first) measurement interval.
N2Number of events in a trailing (second) measurement interval.
N1Number of events in a Channel 1 measurement interval.
N2Number of events in a Channel 2 measurement interval.
n For gated measurements, n is the number of events within the gated interval.