7
●
Remarks on the accuracy of the pressure sensor / Water resistance check
Water depth is preadjusted to measure about 10 m for 400 counts. It is not readjustable.
Apply pressure by water resistance tester and check if the water pressure falls within the range of {(the
current pressure x 1.028)
±
3 %}.
3. Temperature check
Check if the temperature falls within
±
2 of the current temperature.
4. Adjustment Screws
TECHNICAL GUIDE
Cal. DH33A
The table 1 below shows the pressure index value corresponding to the atmospheric pressure. The variance
in the pressure index value is within
±
1 count.
[ Table 1 ]
[ Table 2 ]
Altitude rank by pressure
index value
0
1
2
3
148
116
84
- 31
~
~
~
~
147
115
83
Altitude rank A/D index value
209
208
207
206
205
204
203
202
201
200
199
198
197
196
195
194
193
192
191
190
189
188
187
186
1085
1083
1080
1078
1075
1073
1070
1068
1065
1063
1060
1058
1055
1053
1050
1048
1045
1043
1040
1038
1035
1033
1030
1028
185
184
183
182
181
180
179
178
177
176
175
174
173
172
171
170
169
168
167
166
165
164
163
162
1025
1023
1020
1018
1015
1013
1010
1008
1005
1003
1000
998
995
993
990
988
985
983
980
978
975
973
970
968
161
160
159
158
157
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
965
963
960
958
955
953
950
948
945
943
940
938
935
933
930
928
925
923
920
918
915
913
910
908
pressure index
value
pressure index
value
pressure index
value
atomospheric
pressure (hPa)
atomospheric
pressure (hPa)
atomospheric
pressure (hPa)
❖
Do not touch the adjustment screws unless any adjustment is requred.
Illustaration - The back of the module
Temperature adjustment screw
Pressure adjustment screw
Turn the screw clockwise (or counterclockwise) to adjust
temperature towards the minus (or plus) direction.
Turn the screw clockwise (or counterclockwise) to adjust
accuracy towards the loss (or gain) direction.
Turn the screw clockwise (or counterclockwise) to adjust
pressure towards the plus (or minus) direction.
Time Accuracy (loss/gain) adjustment screw
