Home

News

Basic Models

Special series

Masters of G

Vintage

G-Promotion

G-People

G-Stories

EL Gallery

Support

Where to buy

G in Movies

Fake G Alert!

Links

Guestbook

Profile

Contact

Other watches

Other crazes

G-Fun

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal Accuracy test

Introduction

With a horizontal test I mean not comparing different modules against each other, but same modules against each other.

First change a battery. A DW-6630B was almost dead and we don't want it dead after one month. I forgot to reset, so it looked dead, but in fact the battery is complete full and fresh.

The GW-300, used to set all watches to atomic time.

 

Then I need them grouped in similar modules.

DW-069's and DW-6900. I consider these one of the coolest basic models, but they seem not very accurate.

 

DW-6600, also not particularly known about their accuracy.

 

Three different groups of DW-004/DW-6900E like models.

 

I forgot one G-2300, but now there are two basic blacks.

 

Masters of G: Gaussman, Frogman (GW-200) and Raysman. Very strange the similar models share two different modules

 

DW-003TL's normal and negative displays

 

DW-003S/DW-6900 models

 

New Mudman-s, I also included the GW-9000 with the auto receive turned off...

 

My Beloved DW-003's

 

DW-5600's

 

And when all set to atomic clock, all put in a big box for 30 days.

 

Results:

All watches were set to Atomic time (using a GW-300) on November 23, 2006. A Month is defined as 30 days, so end of test will be on December 22*.

model color module seconds off per month n mean σ(n-1)

DW-003X

DW-003X

DW-9000

DW-003

DW-004

DW-004

DW-004

 

Maroon

Maroon

Black

White

Maroon

Red

Yellow

1596

1596

1596

1596

1596

1596

1596

27

22

25

11

22

9

9

7 18 7.9

G-2300

G-2300

G-2300

G-2300

 

Red

Sand

Black

Black

2184

2184

2184

2184

17

12

15

9

4 13 3.5

AW-571

AW-571

AW-571

AW-570

 

Black

Black (old)

Yellow trim

M.I.Y.

1700

1700

1700

1700

8

10

9

13

4 10 2.2

DW-5600E

DW-5600E

DW-056

 

Red

Black

Black neg.

1545

1545

1545

38

32

13

3 28 13

GW-200

GW-200

GW-200

GW-200

Blue

Black

Gold

Red

2422

2422

2422

2422

 

8

10

31 (?)**

13

3 10 2.5

DW-9300

DW-9300

DW-9300

DW09300

Black 20bar

Black 20bar

Black old

Smoke

1803

1583

1803

1583

 

17

8

9

8

4 11 4.4

DW-003TL neg

DW-003TL neg

DW-003TL neg

DW-003TL neg

DW-003TL neg

Orange new

Orange older

Orange old

White

yellow/blue

1661

1661

1661

1661

1661

17

20

22

11

12

 

5 16 4.8

DW-003 Karate

DW-003TL

DW-003TL

DW-003TL

White

White

Black

Orange

1686

1686

1686

1686

29

14

24

35

4 26 8.9

DW-003S

DW-003S

DW-003S

DW-003S

DW-6900S

Yellow

Green

Red

Green

Blue/Green

1647

1647

1647

1647

1647

20

16

19

29

29

5 23 6.0

GW-9000

G-9000

G-9000

G-9000

Black

Black

White

Green

3050

3031

3031

3031

-8

8

3

16

3*** 9 6.6

DW-003HS

DW-003

DW-003

DW-003

DW-003

Maroon

Maroon

Grey/khaki

Black/khaki

Green

 

1597

1597

1597

1597

1597

21

26

11

20

21

5 20 5.4

DW-069

DW-069

DW-069

DW-6900

DW-6900

DW-6900

DW-6900

DW-6900

DW-6900

DW-6900K

Beige

Beige

Beige

Yellow

Red

Red

Red

Black

Black (no retainer)

Clear colorless

 

1289

1289

1289

1289

1289

1289

1289

1289

1289

1289

15

22

23

48

23

31

40

8

15

17

10 24 12.3

DW-6600 #13

DW-6630B

DW-6630B

DW-6630B

DW-6630B

Black

Yellow

Yellow

Yellow

Purple

1198

1198

1198

1198

1198

47

23

13

16

26

5 25 13.4

DW-6900X

DW-6900E

DW-6900E

DW-6900E BSB

DW-6900X

Silver

Silver/blue

Silver

Silver

Bronze

1449

1449

1449

1449

1449

13

29

27

22

13

5 21 7.6

DW-004

DW-004X

DW-004

Bronze

Maroon

Black

1825

1825

1825

-3

11

17

3 8 10.2

 

 

 

 

     
*A average month is 265/12 = 30.4 days. The watches were synced in the morning of November 23rd and read in the evening of December 22nd, so that's close enough to 30 days I think.

 

** I consider this a spike. I never had problems with this model and as far as I know this one is much more accurate as what I found.

 

*** The GW-9000 has the 3050 module.

 

 

 

 

 

 

 

 

 

 

 

Discussion:

For a real good test you need a pretty large load of the same modules at the time, so specially the tests with a few modules are of course very doubtful. I believe I forgot to set the Gold Defender Frog. I should double check that one.

Is a big σ a problem? No of course not. Casio says often a model is + or - 15 or 30 seconds of per month (I guess it's their 2σ point), so a σ around 7.5 is acceptable for most models, for the 30 seconds of modules 15 is acceptable.

The watches were kept in a relative warm room (my studio with quiet some warm equipment), approx 23C). A watch worn on wrist is warmer, so this might effect the quartz crystal.

As I expected the DW-6600, DW-6900 and DW-5600 don't come out to good. The biggest contradiction is found in the DW-003TL section. It looks like the 1661 and the 1686 module differ more than only a 90 twist of the polarization.

So does this test actually have worth....

Actually I don't think so, it's just fun playing with the numbers. I only had a crappy calculator around, so I had to calculate most σ(n-1)'s with just a pen and paper. Casio admits there is a pretty large allowance of the accuracy, but on the other hand. 30 sec's off per month is an accuracy of 30/2626560*100 = 0.0011%!

NOTE: Updated Sunday December 24th. Readers noticed a miscalculation. A 30.4 day month doesn't have 2635200 but 2626560 seconds. I accidentally multiplied by 30.5.  All numbers are recalculated on a proper calculator. There appeared to be a miscalculation in the 1597 section. The mean was no 16, but 20, which resulted in a significantly smaller σ(n-1).