Fluke PM6690 - Frequency Reference Calibration

Phase
LSD
displ
= 0.001° to 1°, depending on input
frequency (see Phase measurement spec.)
Ratio f
1
/f
2
LSD
displ
= Pr escaler factor / (f
2
x meas. time)
Volt
LSD
displ
=TBD
Number of Pulses in Burst
LSD
displ
=1
Time Interval, Pulse Width,
Rise/Fall Time
n
Total Random Uncertainty rms
uE
q
StartTrigger Error StopTrigger Error=+ +
222
()()
[s] or minimum 1 ps
n
Total Systematic Uncertainty
u = ± Trigger Level Timing Error
± 500 ps Systematic Error
±TimeBaseErrorxMeasurementResult
[s]
Frequency & Period
n
Total Random Uncertainty rms
For measuring times <200 ms:
u
E
q
Start Trigger E rror
Measuring Time
=
+
´
2
2
2
*( )
´ Measurement Result
[Hz or s]
For measuring times >=200 ms:
u
E
q
Start Trigger E rror
Measuring Time N
=
+
*
´
2
2
2
2
*( )
´ Measurement Result
[Hz or s]
N = 800 /Measuring Time, however always
>=6 and <=1000
n
Total Systematic Uncertainty
u=±TimeBaseErrorxMeasurementResult±
200 ps
/Measuring Time [Hz or s]
Ratio f
1
/f
2
n
Total Random Uncertainty rms
u
Presc Fact f Strt Trg Err of f
f
=
+´ ´(..) ( )
2
2
12
2
2
[dimensionless, e.g. ppm]
Phase
n
Total Random Uncertainty rms
uE
q
Strt Trg Err Stop Trg Err Freq=+ + ´´
´°
22 2
360
()( ).
[]
or minimum: (1 ps) x Frequency x 360 [°]
n
Total Systematic Uncertainty
u = ± Trigger Level Timing Error
± 500 ps Systematic Error x Freq. x 360 [°]
Duty Factor
n
Total Random Uncertainty rms
uE
q
Strt Trg Err Stop Trg Err Freq=+ + ´
22 2
()( )
.
or minimum: (1 ps) x Frequency
[dimensionless, e.g ppm]
n
Total Systematic Uncertainty
u = ± Trigger Level Timing Error x Frequency
± 500 ps Systematic Error x Frequency
[dimensionless, e.g. ppm]
Specifications
8-10 Measurement Uncertainties