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The model DL-1 is a microprocessor based data logger. It is designed to count pulses and store the count periodically in memory for later retrieval. Its main application is measuring pulses from radiation detectors used in environmental monitoring systems.

The instrument is a single width NIM (Nuclear Instrumentation Module). It is controlled and operated by an external computer or terminal. The data and setup information is stored in battery backed up memory.

Several DL-1’s can be connected together on a bussed RS-232 daisy chain. Each instrument on the bus has its own unique serial number. A remote telephone modem can easily control many DL-1’s at a remote location. Several passwords are built into the instrument to prevent unauthorized entry into the system.

There are four different inputs on the back panel as well as an event input. The DL-1 scales each input on a 28 bit counter. The time between samples can be set over a wide range. There is enough memory to scale a 1.6 MHz signal on 4 channels with a minute interval for 1 week and not miss a count.

The DL-1 is the ideal instrument for gathering data from nuclear detectors or any other pulsed device.


Size: 8.7H x 11D x 1.35W in. Single width NIM. Weight: 2lbs 6 oz.
Front Panel Controls: Modular RS-232 connector, recessed reset switch, cycle LED, power LED.
Rear Panel Controls: 2 loop through bussed modular RS-232 connectors, 4 counter BNC inputs, 1 BNC event input, RS-232 buss terminator switches, setup switch, NIM power connection.
Internal Controls: RTS and CTS defeat for RS-232 connections, BNC #4 and Event input allocation, clock adjust.

Power Requirements: 150 mA at 12 VDC from NIM power supply. Will work from 6 VDC to 16 VDC.
Backup power: 2 ea AA Alkaline batteries.
Counter Input: TTL/CMOS protected. Input Frequency: 8 MHz max. DC min.
Baud Rate: Front panel fixed at 9600 baud. Rear panel may be set to: 300,600,1200,2400,4800, and 9600 baud.

Input count size: 32 bits sampled every second.
Memory allocation: 1 channel of data takes 1 record. Memory available: 40,320 records (samples) excluding overhead.
Memory organization: Circular with pointers. When memory fills up instrument will erase last records and replace with new data.
Channel size: 0 to 4 channels.
Prescale: May be set to: 1,2,4,8,16,32. All channels the same.
Event input: When activated places a time mark in the data.

Serial Communication: Front panel: RS-232, rear panel: Bussed RS- 232 w/ 2K bus pull down resistors.
Passwords: 3 ea for 3 levels of security.
Access: Both front panel local I/O and rear panel remote I/O bus can change all system parameters except passwords which can be set only by the front panel. Retrieval of stored data is transferred only through the rear panel remote I/O bus.
Program: All setup and functions are menu driven.
Protocol: Serial link for rear panel remote I/O bus data dump is performed using XModem with CRC or checksum protocol.
Data Dump Format: Data from the DL-1 is transferred in encoded hex format. A program designed to run on a PC is included to decode the data. The decoded data from this program is put into a file. It is easy to import into spread sheets, word processors or other programs.

Supplied Software
DL1CV: The program to decode the raw data from the DL-1. It is designed for use on a PC. Source code written in C is also supplied for use on other computers.

Instruction Manual: This manual contains complete information on the operation, maintenance and specifications of the DL-1 and associated programs.
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Specifications subject to change without notice. Fax: +1.805.964.3162 Tel: +1.805.964.3615 Email: [email protected]
Far West Technology, Inc. © 2003