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Appendix A: Specifications
A–6
VX4101A MultiPaq Instrument User Manual
Table A–11: Time Interval
Characteristics Description
Frequency Range Up to 250 MHz (500 MHz with option 1C)
Up to 150 MHz for Time Interval with Delay
Range –1 ns to 9 million seconds
Least Significant Digit 250 ps for N = 1, single-shot
(1 ns/√N) for N > 1 rounded downward to the nearest decade.
Resolution ±LSD±1.414 ((TJE
1
+ TJE
2
)/√N)±2 ps
Accuracy ±TBE (Time Interval) ± Resolution + (TLE
1
/Slew
S
– TLE
2
/Slew
E
)±200 ps
Table A–12: Frequency Ratio
Characteristics Description
Ch 1/Ch 2 and Ch 2/Ch 1 10
–14
to 10
14
Ch 1/Ch 3 and Ch 2/Ch 3 with Option 2C 10
–15
to 1
Ch 3/Ch 1 and Ch 3/Ch 2 with Option 2C 1 to 10
15
Table A–13: Channels 1 and 2 Totalizer
Characteristics Description
Range 1 to 2
52
(4.5 × 10
15
)
Least Significant Digit One count.
Table A–14: Channels 1 and 2 Rise/Fall Time
Characteristics Description
Frequency Range Up to 250 MHz
(0.5 V
p-p
minimum signal for specified accuracy).
Range 250 ps single-shot
1 ns to 9 million seconds
Least Significant Digit 250 ps for N = 1, single-shot
(1 ns/√N) for N > 1 rounded downward to the nearest decade.
Resolution LSD±1.414 ((TJE
1
+ TJE
2
)/√N)±2 ps RMS
Accuracy ±TBE (Time Interval) ± Resolution + (TLE
2
/Slew
S
– TLE
1
/Slew
E
)±200 ps