NOMINAL Exposure time: (DENTOTIME)
MAXIMUM DEVIATION
Exposure time setting (in seconds)
Equivalent
Accuracy of time setting (in
pulses
pulses)
60 HZ 50HZ
0.066
4
3
+1
-2
0.083
5
4
+1
-2
0.10
6
5
+1
-2
0.13
8
6
+1
-2
0.16
10
8
+1
-2
0.20
12
10
+1
-2
0.25
15
12
+1
-2
0.32
19
16
+1
-2
0.40
24
20
+1
-2
0.50
30
25
+1
-2
0.64
38
32
+2
-4
0.80
48
40
+2
-4
1.0
60
50
+3
-6
1.2
72
60
+3
-6
1.6
96
80
+5
-10
2.0
120
100
+6
-12
2.5
150
125
+7
-14
3.2
192
160
+10
-20
Figure 2-5. Exposure time performance parameters.
2-3.
VERIFYING ADEQUACY OF THE POWER SUPPLY
Since the portable x-ray unit requires assembly and disassembly as it is
transported from location to location, you must perform a power supply line adequacy
test every time you reassemble the unit for use. You must document the performance
of the power supply line adequacy test on the Test Record in accordance with local
standard operating procedures. You perform this task as part of scheduled quarterly
PMCS. The specific procedures are described in Lesson 1, Perform PMCS on the
Inter-oral Dental X-ray.
2-4.
To calibrate the digital voltmeter, use the following procedures.
a. Turn the unit off.
b. Remove the screws from the housing cover and remove the cover.
MD0361
2-5