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Heath Company RC-1 Assembly And Operation Manual

Heathkit radiation counter
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Time Constant:. ..................................................... 0.5, 1, 5 and 10 seconds
Ranges: .................................................................. 0-100, 600, 6000 and 60,000 counts per minute
Meter: ..................................................................... Calibrated 4 1/2" 200 uampere movement
Probe: ...................................................................... Satin aluminum and chrome plated steel probe
Speaker: ................................................................. Loudspeaker driven by transistor gives pleasant
Calibration: ........................................................... Calibrate control on panel, radioactive sample
Batteries: ................................................................ 1 - 67 1/2 volt B battery (approximately 200
Tube Complement: ................................................ 1 - 1U4 Amplification, pulse shaping and
Provision for use of external meter (jack on panel).
Prewired high voltage power supply assembly.
Regulated 900 volt DC applied to 6306 tube in probe.
Coiled cord between probe and instrument, no tangling.
Cabinet: .................................................................. Aluminum, 9 1/2" high x 6 1/2" wide x 5" deep
Net Weight: ............................................................ 6 1/2 lbs.
Shipping Weight: ................................................... 8 lbs.
SPECIFICATIONS
0-.02, .1, 1 and 10 milliroentgens per hour
contains extra sensitive type 6306 Bismuth Geiger
counter tube.
tones on most sensitive range, no harsh clicks.
Muted by panel control.
furnished.
hours to 40 volt end point), intermittent
operation.
2 - 1 1/2 volt A batteries (approximately 20 hours
to 1 volt end point), intermittent operation.
1 - 3V4 counting tubes.
1 - 1U5J
1 - 5841 corona regulator tube
1 - 6306 bismuth counter tube
1 - 2N109 transistor (oscillator)

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Summary of Contents for Heath Company RC-1

  • Page 1 SPECIFICATIONS Time Constant:............0.5, 1, 5 and 10 seconds Ranges: ..............0-100, 600, 6000 and 60,000 counts per minute 0-.02, .1, 1 and 10 milliroentgens per hour Meter: ..............Calibrated 4 1/2" 200 uampere movement Probe: ..............Satin aluminum and chrome plated steel probe contains extra sensitive type 6306 Bismuth Geiger counter tube.

  • Page 3: Instrument Description

    GC-1, which uses a bismuth counter tube. Using the model GC-1 Geiger Counter Probe with the model RC-1 Radiation Counber comprises an instrument more sensitive but otherwise equal to many now selling for $250.00 or more. A calibrated, completely safe radiation source is provided with each model RC-1 for spot calibration in the field.
  • Page 4 Two filament batteries (ordinary flashlight cells) and a 67 1/2 volt B battery (such as is used in most portable radios) supply all operating voltages for the instrument. The power supply sub- assembly derives its operating voltage from the 67 1/2 volt B battery. Its output voltage is sufficiently high (greater than 1200 volts) that it may be regulated at 900 volts for use with the Geiger Counter Probe.
  • Page 5 The supply voltage is then divided between the series resistor and the parallel combination of regulator and load, and the regulator tube tends to hold the voltage across the load constant. For circuit analysis, the tube may be considered as a constant voltage source (whose value is the nominal operating voltage of the regulator) in series with a resistance (computed from the published regulation curve).
  • Page 7 Read the notes on soldering below. Crimp all leads tightly to the terminal before soldering. Be sure that both the lead and terminal are free of wax, corrosion or other foreign matter. Use only the best rosin core solder, preferably a type containing the new activated fluxes such as Kester "Resin-Five, "...
  • Page 8 A poor solder joint will usually be indicated by its appearance. The solder will stand up in a blob on top of the connection, with no evidence of flowing out caused by actual "wetting" of the contact. A crystalline or grainy texture on the solder surface, caused by movement of the joint before it solidified is another evidence of a "cold"...
  • Page 10 ( ) In a like manner, mount the other three 7-pin sockets at E, F and G. Note the position of the wide space on these sockets. See Pictorial 1. ( ) Mount the filter capacitor mounting wafer at H as shown in Figure 7, placing it on top of the chassis, using 6-32 x 3/8 screws and nuts.
  • Page 11 ( ) Mount the meter jack at DD. Follow the procedure for mounting of controls as in Figure 9. ( ) Install the coaxial connector at EE, using 4-40 screws, nuts and #4 lockwashers. Install a 2-lug terminal strip FF on the screw nearest the speaker. ( ) Mount the meter at GG, using hardware supplied.

  • Page 12: Chassis Wiring

    POWER SUPPLY AND BATTERY MOUNTING ( ) Assemble the A battery mounting brackets as shown in Pictorial 3 and fasten to the side of the U-shaped bracket, using 6-32 hardware. Use flat head screws at X. ( ) Mount the rectangular bracket to the other side of the U-shaped bracket, using 6-32 hardware. Use long 6-32 bolt on the open side.
  • Page 14 ( ) Connect a 680 K resistor (blue-gray-yellow) from D6 (NS) to D4 (NS). ( ) Run a wire from D4 (S) to E4 (NS). ( ) Connect one lead of the .01 ufd 1.6 kv large ceramic capacitor to D6(S). Lay this capacitor against the chassis.
  • Page 15 ( ) Connect a wire from G6 (S) to PI (NS). ( ) Run the red lead coming through grommet C along the inside edge of terminal strip P and connect to G2 (NS). ( ) Connect a wire from G3 (NS) to QB6 (NS). ( ) Connect a 47 K resistor (yellow-violet-orange) between P4 (NS) and G3 (NS).
  • Page 17 PARTIAL ASSEMBLY AND WIRING ( ) Remove the nuts and flat washers from the two switches Q and S on the front chassis apron. ( ) Carefully mount the chassis to the panel as shown in Pictorial 5, inserting the switch shafts through the matching holes in the panel.
  • Page 18 ) Connect a wire from DD2 (S) (outside terminal) to SI (S). ) Connect a 1 megohm (brown-black-green) resistor between FFl (NS) and EE (NS). ) Connect a .02 ufd 1.6 kv capacitor from FFl (NS) to FF2 (S). ) Identify the short length of teflon insulated wire. This is the short length of stranded wire. The insulation will have a soapy feel.

  • Page 20: Test And Calibration

    Fasten the instrument in the cabinet using three self-tapping screws through the holes in the bottom of the cabinet. This completes the construction of your model RC-1 Radiation Counter. CONSTRUCTION OF THE GEIGER COUNTER PROBE MODEL GC-1 Refer to Pictorial 7 on Page 21.

  • Page 22: In Case Of Difficulty

    power supply unit. This is normal and indicates the power supply is working. The meter needle will be indicating above zero at this time; the exact reading is immaterial. If any sound is coming from the speaker, rotate the PITCH control knob fully counterclockwise. Place the radioactive calibrating sample on a clean surface.

  • Page 23: Operation

    All voltages are DC and are measured with respect to the chassis. NC - no connection. NS - not significant. All voltages should be within ±25% of those listed in the chart. NOTE: DO NOT ATTEMPT TO MEASURE THE DC VOLTAGE AT PIN 3 OF SOCKET A NOR THE VOLTAGE AT THE OUTPUT OF THE POWER SUPPLY OR AT THE PROBE CONNECTOR.
  • Page 24 Most uranium minerals are black or bright shades of green, yellow and orange. These are most accurately identified and their uranium content determined by laboratory methods, but two criteria either singly or together aid in identifying them in the field. First, along with thorium and some potassium minerals, uranium minerals are radioactive and generally can be detected and measured by a Geiger or scintillation counter.
  • Page 25 Instruments showing evidence of acid core solder or paste fluxes will be returned not repaired. The Heath Company is willing to offer its full cooperation to assist you in obtaining the specified performance level in your instrument. Factory repair service is available for a period of one year from the date of purchase or you may contact the Engineering Consultation Department by mail.

  • Page 26: Shipping Instructions

    WARRANTY The Heath Company limits its warranty of parts supplied with any kit to a period of three (3) months from the date of purchase. Replacement will be made only when said part is returned postpaid, with prior permission and in the judgment of the Heath Company was defective at the time of sale.
  • Page 27 PART PARTS DESCRIPTION PART PARTS DESCRIPTION Per Kit Per Kit Tubes-Transistors Hardware 411-56 1U4 tube 250-2 3-48 screw 411-83 1 U5 tube 250-4 4-40 x 3/8 screw 411-84 3V4 tube 250-8 #6 self tapping screw 417-1 2N109 transistor 250-9 6-32 x 3/8 screw 411-87 5841 tube 250-11...

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