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Appendix A: Specifications
A–12
VX4101A MultiPaq Instrument User Manual
Table A–30: Counter Specifications Terms
Term Description
Frequency Terms F Frequency of the signal being measured (F = 1/P).
F
L
Frequency of the leading (first) signal being measured.
F
T
Frequency of the trailing (second) signal being measured.
F
1
Frequency of the Channel 1 signal being measured.
F
2
Frequency of the Channel 2 signal being measured.
F
n
Frequency of the Numerator (Ratio Measurement).
F
d
Frequency of the Denominator (Ratio Measurement).
F
VCO
Frequency of the Universal Counter Voltage Controlled Oscillator time base.
(F
VCO
has been chosen so that it is not evenly divisible by 10 kHz, thereby
reducing the likelihood of aliasing.) It is calculated as follows:
(F
VCO
= 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.
N
1
Number of events in a leading (first) measurement interval.
N
2
Number of events in a trailing (second) measurement interval.
N
1
Number of events in a Channel 1 measurement interval.
N
2
Number of events in a Channel 2 measurement interval.
n For gated measurements, n is the number of events within the gated interval.