Dynalyzer – Digital Display/Printer OPERATION MANUAL
6
Predicted Maximum mAs Reading Inaccuracy for Selected Exposure Times
RAD Mode (1 mV/mA as selected at High Voltage Unit)
Exposure Time
Displayed
(msec)
mAs Displayed
10 100 500 1,000 2,621*
10 ± 0.17 ± 0.71 ± 3.1 ± 6.1 ± 15.8
100 ± 0.26 ± 0.80 ± 3.2 ± 6.2 ± 15.9
1,000 ± 1.16 ± 1.7 ± 4.1 ± 7.1 ± 16.8
9,999 ± 10.16** ± 10.7 ± 13.1 ± 16.1 ± 25.8
FLUORO Mode (20 mV/mA as selected at High Voltage Unit)
Exposure Time
Displayed
(msec)
mAs Displayed
0.4 2 10 50 131*
10 ± 0.10 ± 0.11 ± 0.16 ± 0.40 ± 0.89
100 ± 0.11 ± 0.12 ± 0.17 ± 0.41 ± 0.90
1,000 ± 0.20** ± 0.21 ± 0.26 ± 0.50 ± 0.99
9,998 ± 1.10** ± 1.11** ± 1.16 ± 1.40 ± 1.89
* Maximum measurable value of mAs.
** Not recommended; usefulness limited by inaccuracy.
Calculated Quantities
The following values are calculated from some combination of the measured quantities. The
accuracy of a particular reading must therefore be determined by calculating the possible error in
the two measured quantities and combining these errors. Note that a large final error can occur
when either of the measured quantities is very small.
mA (average anode current)
Radiographic mode 0.1 to 9999 mA (See note 5.)
Fluoro mode 0.01 to 500 mA (See notes 3
and 5.)
Triggering Percent (2 to 100%) Preset
kVp Trigger Level
Range (actual) 2.4 to 200 kV 4 to 200
Increment 0.4 kV 0.4 kV
Accuracy ± (2% + 0.4 kV) ± (1% + 0.4 kV)
mA Trigger Level (Normal Mode)
Range (actual) 40 to 9999 mA 40 to 999 mA
Increment 40 mA 40 mA
Accuracy ± (2% + 40 mA) ± (1% + 40 mA)
mA Trigger Level (Fluoro Mode)
Range (actual) ± 2 to 500 mA 2 to 500 mA
Increment 2 mA 2 mA
Accuracy ± (2% + 2 mA) ± (1% + 2 mA)
External Trigger Level
Range (actual) Not allowed (error code 904) 3.0 to 10.0 volts
Increment 0.1 volts
Accuracy ± (0.3 + 5%)
Rise of fall time lag, max 150 usec
Input impedance 1K Ohm
Auto Trigger Update Rate
Approximately once per second, 0.75 second sample time
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