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min 0.02

0.17

1

2

3

4

4

1 - surface, on which the force sensitive

quartz crystal is mounted

2 - force sensitive quartz crystal EPKV-10M.

3 - undercut.

4 - contact leads.

FORCE SENSITIVE QUARTZ CRYSTAL EPKV-10M

APPLICATIONS

The force sensitive quartz crystal EPKV-10M is intended for operation

in a structure of precision electronic balances. It converts face shear

strain into a frequency variation. Using this crystal, it is possible to design

balances for weighing with a split-hair accuracy of weights by a mass

from several milligrams up to hundreds of kilograms.

FEATURES

-

High resolution and accuracy

-

Long term quartz crystal stability

-

Wide temperature range (-40…+80 °C)

-

Low power consumption

-

Suitable for precision weighting equipment

-

Cost effective

OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS

PARAMETERS

SPECIFICATIONS AND REMARKS

UNITS

Electrical characteristics

9960…10100

kHz

30; 50 / 50

kΩ

1.0

mW

Operating conditions

Force sensitivity

3.5 ± 0.3

Hz/gm

-40…+80 / -60…+100

°C

+5…+40

°C

Maximum frequency deviation

9.8 ± 0.85

kHz

Maximum stress-strain load

± 5…± 20

kg

± 50

ppm

Aging first year/next years max.

± 5 / ± 25

ppm

9.1…8.1

pF

Capacitance ratio r

200

Size

4 x 10 x 0.17

mm

One side with one electrode of the force sensitive quartz crystal EPKV-10M is glued by epoxy

adhesive on a cleaned and skim surface, thus the central part of the crystal should be free (see

figure). After curing of the glue, the two wires are soldered to the contacts of the crystal, if required.

If the crystal is in a free condition, its force sensitivity characteristic is practically linear.

If the crystal is mounted, a nonlinearity of the force sensitivity characteristic occurs, which must be

determined individually.

EXTERNAL DIMENSIONS

UNITS: millimeters