SOP Title: Operation and Calibration of Stop Watch

SOP Title: Operation and Calibration of Stop Watch

1. Objective:

To lay down the procedure for Operation and Calibration of Stop Watch.

2. Scope:

This SOP is applicable for Operation and Calibration of Stop Watch located in Quality Control Laboratory .

  

3. Responsibility:

• Quality Control: To prepare and review the SOP. To follow the procedures laid down for operation, cleaning and calibration of Stop Watch as per this SOP.
• Quality Assurance Department: To review and approve the SOP and Annexures.

4. Accountability:

Head Quality Control Department, Head Quality Assurance Department

5. Procedure:

 

5.1	Operation:
5.1.1	The stopwatch consist of  two  dials,  Big dial shows the time in ‘seconds’ and small dial shows time in ‘minutes’.
5.1.2	Further one second divided in 10 parts i.e. 1 second = 1/10 parts. Hence time can be measured as min;sec:1/10 parts of second. Example: Small dial on 2 and big dial on  9th line after crossing 10 then time can be measured as below:- 02 minutes: 10 seconds :1/9 parts of second or 02 minutes: 10 second : 900 milli seconds. 1 Second = 1000 milli second, one line on stop watch = 100 milli seconds.
5.1.3	One key is provided on the top of the stopwatch to start and stop the counts.
5.1.4	If  the  needle  of  both  dials  are  not  vertically  align  to  ‘ZERO’  press the key twice to bring both the dials to zero position.
5.1.5	To start the stop watch, press the key once and the clock starts.
5.1.6	To stop the stop watch once again press the key of the stopwatch and stop the watch.
5.1.7	To reset the time to ‘ZERO’, press the key twice.
5.2	Calibration Procedure:
	Frequency:  Once in a year
5.2.1	Calibration is carried out by external agency as per SOP “Calibration of Instruments and Equipments”.
5.2.2	Refer Annexure for calibration test to be performed and acceptance criteria. Sr. No. Tests Set Value min : sec : 1/10 sec Acceptance Criteria (± 1%) (min : sec : 1/10 sec or  min : sec : milli seconds ) Acceptance Criteria Range ± 1% 1. Time Verification 01 : 00 : 00 ± 00:00:06 or 00:00:600 00 min : 59 sec : 400 milli sec To 00 min : 06 sec : 600 milli sec 03 : 00 : 00  ± 00:01:08 or 00:01:800 2 min : 58 sec : 200 milli sec To 3 min : 01 sec  : 800 milli sec 06 : 00 : 00 ± 00: 03:06 or 00:03:600 5 min : 56 sec : 400 milli sec To 6 min : 03 sec  : 600 milli sec 09 : 00 : 00 ± 00:05:04 or 00:05:400 8 min : 54 sec : 600 milli sec To 9 min : 05 sec  :400 milli sec 12 : 00 : 00 ± 00: 07:02 or 00: 07:200 11 min : 52 sec : 800 milli sec To 12 min : 07 sec  :200 milli sec 15 : 00 : 00 ± 00:09:00 or 00:09:000 14 min : 51 sec : 000 milli sec To 15 min : 09 sec  : 000 milli sec
5.2.3	Generate the A. R. No. on the “Instrument/Equipment Calibration Register” as per SOP and give requisition to QA department for calibration formats of instruments/equipments on the due date of calibration.
5.2.4	For issuance of calibration report refer QA SOP.
5.2.5	If any breakdown occurs, follow procedure as per SOP “Calibration of Instruments and Equipments”.

 

6. Definitions / Abbreviations :

• Definitions :
• Abbreviations :

Abbreviation	Expansion
A. R. No	Analytical Reference Number
No.	Number

 

*Note – Ready to use SOP available in “DOWNLOAD” Section.