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Reference EN 60444-4:1997
Title Measurement of quartz crystal unit parameters by zero phase technique in a pi-network - Part 4: Method for the measurement of the load resonance frequency fL, load resonance resistance RL and the calculation of other derived values of quartz crystal units, up to 30 MHz
Project Number 6932
Abstract/Scope Specifies a simple method of measuring load resonance frequency. The method uses the change in resonance frequency which occurs when a load capacitance is inserted in series with the crystal unit.


Current Stage code 6060
Current Stage code date 1997-04-17
Current Stage code deadline 1997-12-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 49
Reference Document IEC/TR 60444-4:1988 (EQV)
ICS 31.140 - Piezoelectric and dielectric devices
Keywords Quartz crystal unit; Pi-network; Load resonance; Measurement
Note D114/118: CLC/TC 49 disbanded
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 1997-04-17 1997-12-01 export to doc file  EN
5099 1997-03-11 1997-04-11  
5062 1997-01-27 1997-03-11  
5020 1996-07-30 1996-10-31  
1599 1996-03-05 1996-09-05  
1562 1996-01-25 1996-03-05  
1520 1995-08-10 1995-11-15  
1099 1995-07-04 1995-08-04  

Implementation Dates

date of Ratification (DOR) (1) 1997-03-11
date of Availability (DAV) (2) 1997-04-17
date of Announcement (DOA) (3) 1997-06-01
date of Publication (DOP) (4) 1997-12-01
date of Withdrawal (DOW) (5) 1997-12-01


Superseded by  
Normative reference (6) IEC 60122-1:1976
IEC 60122-2:1983
IEC 60302:1969
EN 60444-1:1997
EN 60444-2:1997

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.