Fluke Biomedical 945A - Manual (Page 64)

Power Supply
The UDR power supply is rated at +5 volts @ 3 amps, +15 volts @ 2.0 amps, and -15 volts @ .5 amps.
The AC input to the power supply may range from 90 to 204 VAC @ 50/60 Hz. However, the 946A must
be specifically configured for use at voltages exceeding 125 VAC 50/60 Hz. The power supply is
designed to meet safety requirements UL/CSA/VDE. EMI emissions comply with FCC/Class B
requirements.
The power supply provides all internal UDR voltages as well as detector supply voltages. All outputs are
protected with automatic recovery upon removal of overload or short circuit condition.
Optional Circuit Boards
Option circuit boards are installed into the 50 pin J3 connector available on the main circuit board. As
many as three option boards may be stacked into the J3 bus. The following paragraphs describe the
available options. A separate manual, for each option board, is available with more detailed information.
Listed below are the option boards currently available. Refer to Table 1-2 for currently available
modifications and to Appendix C for the Bill of Materials.
1. 942-200-75: ANALOG OPTION INPUT BOARD - (Generally not used for normal operation with the
946A-200 UDR, however, it is used if the UDR is part of a simulator) Contains four separate
channels for analog input. A 0 to 10 VDC input or 4 to 20 mA input can be selected independently for
each channel using the jumpers and switches provided on the board. Possible inputs to the board
include: temperature, pressure, flow, or simulated radiation.
2. 942-200-80: COMMUNICATIONS LOOP OPTION BOARD - Designed to enable a EIA RS232C
standard communications link between VICTOREEN's ratemeter and a user computer system or
CRT terminal, with baud rates ranging from 50 baud to 19200 baud. An asynchronous
communication interface adapter is utilized to format the data and control the interface.
The Communication Loop Option Board also provides an isolated multi-drop, serial communications
port for interface with a supervisory computer system. The serial data is in a modified RS232 format,
and utilizes Victoreen’s proprietary VICO loop protocol. For maximum electrical noise protection, a
six conductor communication cable is used.
The 946A-200 UDR has one standard 942-200-80 Communications Board to support
communications between the preamplifier.
3. 942-200-95: ANALOG OUTPUT BOARD - Designed to provide a user selectable single output
voltage of: 0 - 10 Vdc, 0 - 5 Vdc, 0 - 1 Vdc, 0 - 500 mVdc, 0 - 100 mVdc, 0 - 50 mVdc, or 0 - 10 mVdc.
4. 942-200-95M1: DUAL ANALOG OUTPUT BOARD - Designed to provide two user selectable output
voltages. Output #1 is either 0 - 5 Vdc, or 0 - 10 Vdc, while output #2 is either 0 - 10 mV dc, 0 - 50
mVdc, 0 - 100 mVdc, 0 - 500 mVdc, or 0 - 1 Vdc.
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