ADM-01 Analog Digital Radiation Meter

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Product Information

Specifications

• Model: ADM-01
• Type: Analog Digital Radiation Meter
• Power Source: 7-12V battery or regulated 5V power supply
• Display: 8×2 LCD
• Measurement Units: CPS, mR/hr, mSv/hr

Product Usage Instructions

Powering the Unit

The ADM-01 can be powered by a 7-12V battery or a regulated 5V
power supply. Connect the power source to the appropriate terminals
on the board as per the instructions provided in the manual.

Turning On and Off

Use the bottom switch on the right side of the board to power
on/off the unit. The top switch controls the backlight of the
LCD.

Selecting Measurement Units

To switch between imperial (mR/hr) and metric (mSv/hr) radiation
measurements, place a jumper on the two-pin header as shown in
Figure 4 of the manual.

Reading Display

The top line of the display alternates between displaying CPS
and approximate radiation level. The second line shows the analog
radiation field strength meter providing a visual indication of the
current CPS reading.

FAQ

Q: How do I change the battery?

A: To change the battery, carefully open the casing of the unit
and replace the existing battery with a new one following the
polarity markings.

Q: What is the range of CPS values that can be displayed?

A: The analog power meter can read CPS values from 1 CPS to 2040
CPS.

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Images Scientific Instruments Inc. 109 Woods of Arden Road Staten Island NY 10312 718.966.3694 Tel 718.966.3695 Fax www.imagesco.com
Construction Manual & Users Guide
Model ADM-01 Analog Digital Radiation Meter
The Analog Digital Radiation Meter counts the pulse output of a standard analog Geiger counter to provide a visual readout of the CPS, approximate radiation level (imperial/metric) and analog radiation field strength meter. Features:
·7-12VDC or 5VDC power supply input ·Counts TTL pulses from Analog Geiger Counter ·Outputs Digital Counts Per Second (CPS) value ·Outputs radiation level (imperial / metric) ·LCD Backlight ·Available as a kit or assembled

Table of Contents Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Using the Meter. . . . . . . . . . . . . . . . . . . . . . . . . . 3 Powering the Unit . . . . . . . . . . . . . . . . . . . . . . . . 4 Selecting Imperial or Metric Readings. . . . . . . 4 Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Circuit Construction. . . . . . . . . . . . . . . . . . . . . . 6 Mounting the Meter. . . . . . . . . . . . . . . . . . . . . . .8 ADM-01 Parts List. . . . . . . . . . . . . . . . . . . . . . . .8 Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . 9
Features
The Analog Digital meter alternates the first line of its display between Counts Per Second (CPS) and then approximate radiation level in either imperial measurements (mR/hr) or metric measurements (mSv/hr). The top line of the display alternates its display every second. The 2nd LCD line is a analog radiation field strength meter that provides a quick visual indication of the current CPS reading. Figure 1 displays the reading in CPS, while Figure 2 shows the approximate radiation level.
To fit nicely on the 8 character display line the imperial measurement of mR/ hr is abbreviated to mR. Likewise the metric measurement of mSv/hr is abbreviated to mS.
The second line of the 8×2 LCD is a dedicated analog power meter to read a

Figure 1

Figure 2

reasonable approximation of CPS from 1 CPS to 2040 CPS.

• The LCD alternates between display the mR/hr value and CPS. The CPS 2

value used for the power meter display portion is update on each display screen. The following table illustrates the relationship between the analog power graphic and the CPS value.
Using the Analog Digital Meter
Images’ Analog Digital Meter allows you to add a digital display to your analog Geiger counter. The default display will provide readings in CPS and mR/ hr. The ADM-01 has two switches on the right hand side of the board. The bottom switch is the power switch. The top switch allows you to turn the backlight on the LCD on and off.
Powering the unit:
3

The ADM-01 may be powered by a 7-12V (transistor) battery or by a regulated 5 volt power supply. When powered by the 7-9 volt battery the ADM-01 board may source 5 volts 50 mA of 5V current, off its 5V in/out line. Units that are purchased assembled are set up for 5VDC.
The PCB connection pads, are .100 spaced and you can connect to the board using female /male headers or 22ga. wires depending upon your application. In this example we are connecting to the ADM-01 using wires.
In our example we are powering the ADM-01 board using a 5 volt power supply (red wire), Ground (GND black wire) and the B0 (white wire) soldered on the PCB as shown below in figure 4. For additional wiring options see page 9.
Selecting Imperial (mR/hr) or Metric (mSv/hr) Radiation

mR/hr mSv/hr Header

Figure 4 Back View & Close Up

Measurement:
Figure 4 also shows a two pin header, outlined using a red box. Placing a jumper on this two-pin header will change the radiation reading from imperial mR/ hr to metric mSv/hr radiation measurement.

4

Figure 5
5

Construction
Figure 5 shows the schematic for the Analog Digital Radiation Meter (ADM01). Figure 6 is the blank PCB. All components are mounted and soldered to the top silkscreened side of the board unless otherwise noted.
Figure 6
To begin mount and solder the 5-pin 10K resistor pack (R1). Pin 5 (last pin when reading the text on the resistor) should go in the top hole of R1 on the PCB. Mount and solder the 20K potentiometer at R2. Next mount and solder the two .1uf 50V capacitors (C1 & C2), followed by C3, the 10uf 16V capacitor. Depending on your casing of the unit, this capacitor may need to bent flat prior to soldering, as shown in the completed circuit, Figure 7 on the next page. Now mount and solder the 1N4007 diode, D1. Be sure to align the markings on the diode with the silkscreened outline on the pcb. Next mount and solder the voltage regulator, 78L05 at U1, again, making sure to align it with the printed silkscreen outline. Mount and solder the 18-pin IC socket at U2. Align the notch on the IC socket with the notch on the silkscreened outline. This will aid in the proper installation of the microcontroller. Next mount and solder the two right angle slide switches, S1 & S2. S4 is a 2-pin header. Adding a jumper to this header allows
6

one to switch the unit from mR/hr to mSv/hr.

The two 8-pin headers should be mounted and

soldered to the underside of the pcb at D2, as

shown in Figure 7 at the right. Place the LCD

down onto the headers and solder into place.

Insert the preprogrammed 16F88 microcontroller into the IC

Figure 7

socket. Be sure to line up the notch in the chip with the notch in the socket.

You need to think about how you want to connect the ADM-01 to your circuit and what power supply you want to use. The ADM-01 is a versatile development board for the 16F88 PIC microcontroller. Figure 8 below illustrates the lines available to the user. In this application we are using it as an AnalogDigital-Meter and we only need to use three lines.

Figure 8 Front View
7

*You are now ready to connect the Analog Digital Radiation meter to an analog Geiger counter. Connect the white wire to the pulse output of the Geiger counter. Make sure both the Geiger counter and ADM-01 meter share a common ground. Various wiring diagrams are included on the following pages.
Mounting the Meter
The mounting outline measurements for the ADM-01 are shown in Figure 9. These measurements are taken in millimeters.

Figure 9

ADM-01 Parts List (1) PCB-73 (2) CAP-.1uf-50V
(1) CAP-10uf-16V (1) RES -10K-5pin (1) POT-20K-Top (1) 1N4007
(1) 78L05 (1) PIC16F88 (1) ICS-18 (2) SW-27
(1) LCD-01-8×2 (2) SMH-08 (1) SMH-02 (1) Jumper
(1) Manual

C1 C2
C3 R1 R2 D1
U1 U2

Misc. Materials – 3 feet of stranded wire (each in different color)

8

Wiring Options for ADM-01 Analog / Digital Meter
The following images show a variety of wiring options available for our Analog Digital Meter.

Figure 10

Figure 11

Figure

10 outlines wiring connec-

tions for

supplying the unit with 5V power. Figure 11 outlines the wiring for 9V.

Jumping Figure 12 the switch controls, as in Figure 13 Figure 12,

would

supply the unit with con-

stant power

and backlight. Power is supplied by either 5 or 9 volts, and is constant when

your Geiger counter is turned on.

Figure 13 outlines how to wire the unit if you choose to use external switches and/or contrast control.

9

Wiring Options for ADM-01 Analog / Digital Meter
The following images shows power and pulse connections to GCK/GCA-01. Figure 14
10

Wiring Options for ADM-01 Analog / Digital Meter
The following images shows power and pulse connections to GCK-02. Figure 15
11

References

• Images Scientific Instruments Inc

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