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Appendix A: Specifications
A–4
VX4101A MultiPaq Instrument User Manual
Universal Counter Specifications
This section contains specification tables for the counter. The specifications
contain a variety of equations and mathematical operators. A table at the end of
the counter specifications contains definitions for the operators.
Table A–6: Universal Counter General Specifications
Characteristics Description
Number of Channels One input channel for frequency, period, pulse width, time interval, time interval after
delay, rise time, fall time, an ratio. A second input channel can be used independently for
frequency, period, pulse width, rise time, and fall time; or in conjunction with the first input
for time interval, time interval after delay, and phase angle. The second input can also be
used for very-high-speed gating.
A third input channel (OPTIONAL) uses a divide-by-4 prescaler for extremely high speed
signals. It measures frequency or period, or measures ratio in conjunction with either of
the first two inputs.
Number of Digits Up to 17 digits will be returned. Engineering notation is used for positioning the decimal
point except for totalizing event measurements.
Gating Front panel Arm signal, VXI command gating, VXI backplane triggers, and fixed interval
timing. Gating can be: level, pulse on from one source and off from a second source, or
on from the edge of one pulse then off from the corresponding edge of a second pulse.
Table A–7: Channel 1 and 2 Frequency
Characteristics Description
Range 0.1 µHz to 250 MHz (500MHz with Option 1C)
Least Significant Digit 10exp{Int(log((P
VCO
/4) * F
2
/(N"F(P
VCO
/4)))) + 1}.
Resolution UnGated Resolution:
±LSD±1.414(TJE) F
2
/N.
Gated Resolution:
±((P
VCO
) F
2
/n)±(1.414(TJE) * F
2
/n).
Accuracy ±Resolution±F(TBE).