Interesting resonator. It is not just single quartz plate, it is the resonator thermostat; inside a set from actually quartz, the pozistor heater and a getter.
It reaches high heat stability - the relative frequency drift in all operating temperature range doesn't exceed 1,5 х 10-6.
1-6 - Piezoelement
3-4 - Pozistor heater
2-7 - Getter  
  Good quality of not less than 300000
  Direct capacitance  7 pF
  Heater power in case of U=18V no more than 9 W.
  It is forbidden to give electrical load of a getter.
Frequency - 2000kHz


Text translated, pics are not available to paste in description:

RESONATORS QUARTZ VACUUM


RK180DG



Quartz resonators-thermostats RK180DG with self-regulating posistor heaters are designed for use in electronic equipment.

The resonators are manufactured in climatic versions U, UHL.


Weight - no more than 20 g


BQ - piezoelectric element

R- remote heater

E – getter



An example of recording the full symbol of the resonator when ordering and in the design documentation:

Resonator-thermostat RK180DG - 5184 K, where

RK180DG - abbreviation

5184 K - rated frequency (kHz)

General specifications GOST 11599-67



PERMISSIBLE INFLUENCING FACTORS DURING OPERATION


Vibration loads:

frequency range (Hz) ........................................ from 1 to 200

accelerated, m/s² (g), not more than …............. 49,1 (5)


Multiple shock loads:

acceleration, m / s² (g), no more ...................... 147 (15)

impact duration, ms from ................................. 2 to 15


Single shock loads:

acceleration, m / s² (g), no more ....................... 735 (75)

impact duration, MS .......................................... from 2 to 6


Linear (centrifugal) loads:

acceleration, m/s² (g), no more ... .....................245 (25)


Operating temperature range, K (°C) ............... from 213 to 333 (from minus 69 to 60)


Relative air humidity at a temperature of 298 K (25 ° C), %, no more ............. 98

Reduced atmospheric pressure, Pa (mm Hg) ..................................................... 53600 (400)

Increased pressure of air or gas, Pa (kgf / cm²) .................................................. 297198 (3)

Frost and dew.

BASIC TECHNICAL DATA


Rated frequency, kHz ........... 4096

4464

5000

5184


Note. It is allowed to manufacture resonator-thermostats for other nominal frequencies in the range from 4096 to 5184 kHz. At the same time, the customer provides the manufacturer with equivalent generators for the corresponding frequencies.


Setting accuracy at a setting temperature of 298 ± 5 K (25 ± 5 ° C), no more .......... ± 5 · 10-6

Maximum relative change in operating frequency in the range of operating temperatures, not more ........................................................................................................................... ± 1,5 · 10-6

Quality factor, not less ............................................................................................... 300 · 10³

Dynamic inductance, G, not less ............................................................................... 0,05

Static capacitance, pF ................................................................................................ 7 ± 3



RELIABILITY


Minimum operating time, hours not less .................................................................. 10000

Storage life, years, not less ....................................................................................... 10


The relative change in the operating frequency during:

minimum operating time, no more............................................................................ ± 5 ·10-6

shelf life .................................................................................................................... ± 5·10-6

including for the first year of storage ....................................................................... ± 2,5 · 10-6


DIRECTIONS FOR USE AND OPERATION


Power dissipated by resonators, μW, no more .......................................................... 500


Time to reach the mode in the intervals of operating temperatures from 243 to 333 K (from minus 30 to 60 ° C) and from 243 to 323 K (from minus 30 to 50 °C), min., No more ...... 5


Maximum power consumed by the heater when switched on, in the operating temperature ranges from 243 to 333 K (from minus 30 to 60 °C) and from 243 to 323 K (from minus 30 to 50 °C) at a voltage of 18 V ± 1%, W , no more ........................................................................... 9


The power consumed by the heater in a steady state, in the ranges of operating temperatures from 243 to 333 K (from minus 30 to 60 °C) and from 243 to 323 K (from minus 30 to 50 °C) at a DC voltage of 18 V ±1 %, W, no more ............................................................................ 0,5

Do not apply electrical load to the getter.


It is allowed to solder flexible leads at a distance of at least 4 mm from the resonator base with solder at a soldering temperature of no more than 523 K (250 °C) and a soldering time of no more than 5 s.


When soldering the leads, measures must be taken to exclude damage to the resonators due to overheating and mechanical forces.