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4-6 Measurement Uncertainty
Performance Verification
4-6
PN: 10370-10386 Rev. B
MG362x1A MM
4-6
Measurement Uncertainty
The test records found in
specify a measurement uncertainty. The measurement
uncertainty listed in each test record includes the best estimate of the errors contributed by the measurement,
test equipment, standards, and other correction factors (for example, calibration factors and mismatch error)
based on the suggested equipment, the equipment setup, and the prescribed test procedure. Most of the
uncertainties are type-B per the ISO/IEC TAG 4 Guide for the Expression of Uncertainty in Measurement
(GUM).
4-7
Internal Time Base Aging Rate Test
The following test can be used to verify that the MG362x1A 10 MHz time base is within its aging specification.
The instrument derives its frequency accuracy from an internal 10 MHz crystal oscillator standard. An
inherent characteristic of crystal oscillators is the effect of crystal
aging
within the first few days to weeks of
operation. Typically, the frequency of the crystal oscillator increases slightly at first, then settles to a relatively
constant value for the rest of its life.
For the greatest absolute frequency accuracy, allow the MG362x1A to warm up until its RF output frequency
has stabilized (usually 7 to 30 days). Once stabilized, the change in reference oscillator frequency should
remain within the aging rate if (1) the time base oven is not allowed to cool, (2) the instrument orientation with
respect to the earth’s magnetic field is maintained, (3) the instrument does not sustain any mechanical shock,
and (4) ambient temperature is held constant. This test should be performed upon receipt of the instrument
and again after several days or weeks to fully qualify the aging rate.
Note
Do not confuse crystal aging with other short term frequency instabilities, for example, noise and
temperature. The internal time base of the instrument may not achieve its specified aging rate before
the specified warm-up time of 7 to 30 days has elapsed; therefore, this performance test is optional.
Note
Before performing this procedure, ensure that all test equipment is calibrated. Refer to the
manufacturer’s test equipment manual.
Figure 4-1.
Equipment Setup for Internal Time Base Aging Rate Tests
Note
There are two procedures for Internal Time Base Aging Rate based on the frequency reference
used. The first procedure is for Absolute Time Corp model 300 use, the second is for Symmetricom
(Datum) model 9390-9600 use.
MG362x1A (DUT)
10 MHz Port
10 MHz REF OUT
Frequency Reference
RF Output
50 Ω
RF On/Off
Unleveled
Output: +29 dBm max
Reverse: +27 dBm, 0 VDC
FREQ
LEVEL
USER
SELECT
0
1
2
3
4
5
6
7
8
9
MG36221A
Signal Generator
20 GHz
Содержание Rubidium MG362 1A Series
Страница 12: ...Contents 10 PN 10370 10386 Rev B MG362x1A MM ...
Страница 16: ...1 9 ESD Requirements General Information 1 4 PN 10370 10386 Rev B MG362x1A MM ...
Страница 30: ...2 6 RF Deck Assemblies Functional Description 2 14 PN 10370 10386 Rev B MG362x1A MM ...
Страница 66: ...3 11 FM and Phase Modulation Calibration Calibration 3 36 PN 10370 10386 Rev B MG362x1A MM ...
Страница 164: ...4 26 Pulse Modulation Tests with the 86100C Oscilloscope Performance Verification 4 98 PN 10370 10386 Rev B MG362x1A MM ...
Страница 292: ...B 5 Self Test Messages Instrument Messages B 8 PN 10370 10386 Rev B MG362x1A MM ...
Страница 293: ......