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General Information
Specifications
1
1-7
command, or exposure detection). The automatic power down feature applies only when the instrument
is operating from battery power. In addition, all front panel settings are saved as part of the automatic
power down sequence.
Internal Electronic High Voltage Ion Chamber Bias Supply
Voltage Range: A maximum of 11 output level settings in the range of -500 V to +500 V may be
programmed during user customization. Once programmed, these output levels become available for use
and may be selected from either the front panel or via the RS-232 interface.
Level Accuracy: Bias voltage is warranted to be within ± 0.3 V over the full operating temperature range
for loads < 0.2 mA.
Internal Verification: The voltage level is continuously measured during operation and compared to the
selected setting. A “LoBias” or “HiBias” annunciator is displayed if the measured level differs from the
selected setting by more than 1 V.
Capacitive Loading: Maximum ion chamber cable capacitance is 5,000 pF from ground to guard or from
guard to center. For a typical 100 pF per meter triaxial cable, the maximum cable length is therefore 50
meters.
Output Current Limit: The output current is limited to < 0.5 mA for operator safety.
General
RS-232 Interface: Single RJ-45 style jack mounted on rear panel. Interface operates at 9600 bps, with 8
bits, no parity, and one stop bit. Xon/Xoff handshaking is employed.
Display: 4 line by 20 character vacuum florescent type.
Environment
Operating: 8°C to 38°C with an absolute humidity of £ 20 g/m
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(the equivalent R.H. is 75% at 25°C, 60%
at 30°C, 50% at 35°C).
Storage: -25°C to +65°C. For maximum battery life, always bring the batteries to a level of full charge
prior to storage, and maintain the storage temperature at 25°C or below. Under these conditions the
batteries should receive an annual maintenance recharge to compensate for the self-discharge effects.
Decrease the time interval between maintenance recharges by one-half for each 10°C increase in storage
temperature above the 25°C baseline.
Mechanical
Dimensions: 21.6 cm wide x 8.9 cm high x 26 cm deep (10 in. x 9.4 in. x 4 in.).
Weight: 4.5 kg (10 lbs.).
1.7 Unpacking and Inspection
The Model 35040 Therapy Dosimeter was carefully inspected before shipment. Upon receiving the Model
35040 Therapy Dosimeter, carefully unpack all items from the shipping carton and check for any obvious
signs of physical damage that might have occurred during shipment. Report any damage to the shipping
agent at once. Retain the original packing material in case reshipment becomes necessary. The
following items are included with the Model 35040 Therapy Dosimeter:
Standard System Contents
• Model 35040 Therapy Dosimeter
• AC Line Cord – USA (CO-19)
• Customization Software Kit (37886)