Am 22.07.21 um 16:11 schrieb ew via time-nuts:
If some one has a bad one how about opening it and take some pictures.
Would be very informative. Bert Kehren
I can only offer an opened Morion MV-89A.
The 10 MHz version is really 5 MHz + doubler.
It stopped oscillating with Vtune > 0.6V, so it was a natural candidate
for forensic medicine.
<
https://www.flickr.com/photos/137684711@N07/49585174873/in/album-72157662535945536/
>
and some pictures following the RIGHT arrow.
These are the measured data of the crystal itself, in case someone needs
input for simulation of a 5 MHz SC crystal.
Measured with the Crystal utility of the DG8SAQ VNWA; I wonder why my
R&S ZVB does not have that.
C0 strays a bit, probably the equation system was somewhat ill defined.
The HP4274A RLC bridge says 2.90 pF.
nominal frequency at room temp.
F = 4999868.18548896
Q = 2058123.87937723
L = 5.31149294399851
C = 1.90768447144417E-16
R = 81.074358418583
C0= 2.8136087840004E-12
B-Mode at room temperature / 27°C
F = 5456268.74855202
Q = 2070228.75819907
L = 5.60406600257822
C = 1.51825777903696E-16
R = 92.8026816958027
C0= 2.50200142407676E-12
fundamental at room temp.
F = 1706530.674
Q =12634
L = 2.882184522
C = 3.017798817E-15
R = 2446.1
C0= 3.400172339E-12
---------------------------------------------
The 88 °C were generated by a Steinelt heat gun that was fixed at the
microscope boom
and an electronic thermometer in the air stream. Not ultra-precision.
Nominal frequency at 87.8°C
F = 4999977.73472294
Q = 2210624.24356611
L = 5.31056260615351 5310652606 nH
C = 1.90793506338953E-16 0.00019079350 pF
R = 75.4698598161708
C0= 2.67067707950378E-12
B-Mode at 88°C
F = 5445966.6930594
Q = 1559143.3579169
L = 4.56636349264629
C = 1.87033681366853E-16
R = 100.216511187362
C0= 3.02668789364201E-12
Fundamental @ 88°c
F = 1706366.18003318
Q = 7829.11559388434
L = 2.67725816365808
C = 3.24941770179082E-15
R = 3666.31393448872
C0= 3.28464263904697E-12
cheers, Gerhard
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