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Laboratory of Time & Frequency

There are 7 staffs working at laboratory, including doctor (Dr.), master (M.Sc) and engineers
- Deputy Head of Lab: Dr. Trieu Viet Phuong (email : phuongtv@vmi.gov.vn)
- Office lab. address: Room 308 - building D, No 8 Hoang Quoc Viet, Cau Giay dist., Ha Noi
- Tel: (+844) 3836 1135    |    Fax: (+844) 3756 4260
- Email of lab.: tgts@vmi.gov.vn

List of CMCs(Calibration and Measurement Capabilities)

1. Time scale difference. Local clock vs UTC(VMI), -1 s to 1 s
    Absolute expanded uncertainty (k = 2, level of confidence 95%) in ns: 2
2. Time scale difference. Local clock vs UTC, -1 s to 1 s
    Absolute expanded uncertainty (k = 2, level of confidence 95%) in ns: 200
3. Frequency. Local frequency standard, 10 MHz;
4. Frequency. Local frequency standard, 5 MHz;
5. Frequency. Local frequency standard, 1 MHz;

More visit to link (BIPM):
http://www.bipm.org/exalead_kcdb/exa_kcdb.jsp?_p=AppC&_q=VN&x=0&y=0 

Calibration and Verification capabilities, Testing capabilities

Calibration capabilities
No
Measurand/ equipment calibrated
Range of measurement
Calibration procedure
Calibration and measurement capability
1 Rubidium atomic frequency
(5; 10) MHz
ĐLVN 164:2005
V09.M-08.08
2 x 10-13
2 Quazt frequency standard
(1; 5; 10) MHz
ĐLVN 164:2005
V09.M-08.08
2 x 10-13
3 GPS time receiver
(1; 5; 10) MHz
1 PPS
V09.M-07.08
V09.M-08.08
2 x 10-13
2 ns
4 Synthesizer/ Function/ Generator frequency generator
< 3 GHz
V09.M-05.08
2 x 10-13
5 Frequency standard generator
(1; 5; 10) MHz
ĐLVN 164: 2005
2 x 10-11
6 Tachometer (1 ÷ 100000) rpm ĐLVN 165: 2005 10-6
7 Electrical frequency counter DC ÷ 26,5 GHz ĐLVN 51: 1999;
V09.M-04.08
2 x 10-12
8 Digital stopwatches ≥ 0,01 s ĐLVN 52: 1999 0,1 s/d
9 Analogue & digital storage osilloscopes DC ÷ 3,2 GHz ĐLVN 116: 2003;
V09.M-01.06
10-3
10 Local clock -1s ÷ 1s V09.M-07.08 2 ns
11 Local frequency standard (1; 5; 10) MHz V09.M-08.08 2 x 10-13
12 Local GPS receiver Longitude, latitude, altitude/ height
V09.M-10.09
5m rms
13 Stopwatches ± 327 s/24h V09.M-06.08 6,7 x 10-8
14 Sound level Frequency range: 31,5 16 kHz
Sound level: 94; 104; 114 dB
V09.M-03.07 10-6 dB
15 Measurement microphones From WS class to lower accuracy V09.M-12.10 0,2 dB
16 Vibration meter
From 0,5 % to lower accuracy
V09.M-13.13
0,5 %
17 Vibration calibrator
From 0,5 % to lower accuracy
V09.M-14.13
0,5 %
18 Sound calibrator
From WS class to lower accuracy
V09.M-15.13
0,08 dB
Testing capabilities
No
Materials or product tested
The name of specific test
Detection limit (if any)/ range of measurement
Test method
1
Taximeters
All measurement requirements
Stretch of road: ± 0,2 %;
Time: ± 0,2 %
ĐLVN 118:2013
2
Automobiles tachograph
All measurement requirements
 
QCVN 31:2014 (The Ministry of Transport - MOT)
3
Electro-mechanical;
Electronic products
Measurement of time interval, frequency, speed
Measurement of acceleration, velocity, displacement, sound level
≤ 30GHz
ISO/IEC,
ĐLVN,
TCVN,...

 

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