Related Manuals for Ludlum Measurements 9-4RF
Summary of Contents for Ludlum Measurements 9-4RF
- Page 1 LUDLUM MODEL 9-4RF Addendum to Model 9-4 Manual May 2020 Serial Number 265751 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 9-4RF Addendum to Model 9-4 Manual May 2020 Serial Number 265751 and Succeeding Serial Numbers...
- Page 4 RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
- Page 5 The other difference between the two instruments is that the Model 9-4RF has special filters on the wires passing into the meter area. These four filters (LMI part # 18- 8185) stop any RF from penetrating into the chassis of the instrument.
- Page 7 Caution - The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used or handled in a manner not specified by Ludlum Measurements, Inc. Note – The operator or responsible body should give special attention to the information provided, as failure to do so may result in damage to the instrument or instrument failure.
- Page 8 Visual images are used in this manual to convey the possible hazard associated with the operation, handling, or maintenance of the instrument. The following definitions are provided to describe these hazards; however, Ludlum Measurements cannot make any guarantees to the extent of the hazard posed.
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Page 9: Table Of Contents
Figure 8 - Main Board Schematic (Page 4) .................................. Back of manual Figure 9 - Electrometer Board Layout (Front) ................................Back of manaul Figure 10 - Electrometer Board Schematic (Page 1) ..............................Back of manual Ludlum Measurements, Inc. May 2020... -
Page 10: Introduction
RESET pushbutton, and a ZERO ADJUST knob. All calibration controls are done digitally using a special calibration kit (part number: 4293- 676) available from Ludlum Measurements. This kit includes a special instrument can, pressure calibration kit, all necessary cables, and control software. -
Page 11: Identification Of Controls And Functions
7 mg/cm². With the slide closed, the window is 1000 mg/cm². Depress the button on the side of the slide assembly to release the slide. Release the button to hold the slide open or closed. Ludlum Measurements, Inc. Page 2 May 2020... -
Page 12: Getting Started
If the instrument is infrequently used, it is recommended that this option not be used because of battery drain. The instrument is shipped with the chamber wall voltage maintained when the instrument is turned off. Ludlum Measurements, Inc. Page 3 May 2020... -
Page 13: Battery Installation
Ensure the Model 9-4 range selector switch is in the OFF position. Open the battery lid by pushing down and turning the quarter-turn thumbscrew counterclockwise a quarter of a turn. Install two “D” size batteries in the compartment. Figure 1 - Battery Installation and Removal Ludlum Measurements, Inc. Page 4 May 2020... -
Page 14: Battery Test
In each case, ensure a proper reading on each scale. If the instrument fails to read within 20% of a proper reading, it should be sent to a calibration facility for recalibration. Ludlum Measurements, Inc. Page 5 May 2020... - Page 15 Damage to the metallized polyester window on the back side of the instrument may result when the slide is open if careful instrument handling is not practiced. The window is fragile and may be punctured quite easily. Ludlum Measurements, Inc. Page 6 May 2020...
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Page 16: Technical Theory Of Operation
35 mV (0.035 V) relative to the guard voltage. At 50 mR/hr on the x10 range, the output voltage will be 350 mV (0.35 V) relative to the guard voltage. Ludlum Measurements, Inc. Page 7 May 2020... -
Page 17: Range Change
RESET held closed, input bias current is adjusted with the zero control for a zero meter dial reading. Allow a five-second recovery period for the meter to settle before and after using the RESET button on the ×1 and ×10 scales. Ludlum Measurements, Inc. Page 8 May 2020... -
Page 18: Range Calibration
A calibration constant is then provided by the microprocessor for each range. In the special case of ×10K scale, the microprocessor also provides a linearity correction. Each range may be calibrated by a calibration equipment kit when connected to P102. Ludlum Measurements, Inc. Page 9 May 2020... -
Page 19: Power Supplies
U106 provides regulated +2.5 volt reference. VR100 provides +4.85 volts for the electrometer. U107 and associated components provides 1.5 volt guard voltage for the electrometer. U104 provides meter reference of 0.2 volts. Ludlum Measurements, Inc. Page 10 May 2020... -
Page 20: Cleaning And Maintenance
Recalibration should be accomplished after maintenance or adjustments have been performed on the instrument. Recalibration is not normally required following instrument cleaning, desiccant servicing, or battery replacement. Ludlum Measurements, Inc. recommends recalibration at intervals no greater than one year. Check the appropriate regulations to determine required recalibration intervals. -
Page 21: Storage
MODEL 9-4 Technical Manual Section 5 Ludlum Measurements offers a full-service repair and calibration department. We not only repair and calibrate our own instruments, but also most other manufacturers’ instruments. Calibration procedures are available upon request for customers who choose to calibrate their own instruments. - Page 22 A storage cabinet with a light bulb inside is one means of keeping the instrument in a slightly warmer-than-ambient temperature environment in order to prevent problems from rapid changes in temperature and humidity. Ludlum Measurements, Inc. Page 13 May 2020...
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Page 23: Specifications
×10 and ×100 ranges; allow three seconds for the meter to stabilize upscale, 15 seconds to stabilize downscale. Noise : Approximately every three minutes an up-scale “kick” may be noted on the ×1 scale. This is due to normal cosmic background radiation. Ludlum Measurements, Inc. Page 14 May 2020... - Page 24 15% of standard conditions (40% RH at 22 °C reading) : 6.4 cm (2.5 in.) arc, mA, pivot-and-jewel suspension Meter : BAT TEST, 0-5 mR/hr linear for ×1 through ×10K ranges Meter Dial Ludlum Measurements, Inc. Page 15 May 2020...
- Page 25 -20 to 50 °C (-4 to 122 °F); temperature compensation maintains calibration within 20% of 22 °C (72 °F) reading over the entire temperature range : 1.9 kg (4.2 lb), including batteries Weight Ludlum Measurements, Inc. Page 16 May 2020...
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Page 26: Recycling
To this end, Ludlum Measurements, Inc. strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products. -
Page 27: Parts List
Shielding Model 9-4 Chamber Top 7536-223 Co-Netic Shield Model 9-4 Chamber Top 7536-224 Netic Shield Model 9-4 Model 9-4 Manual User’s Manual Certificate of Calibration FORM C22A Calibration (Valid for 1 Year) Certificate Ludlum Measurements, Inc. Page 18 May 2020... -
Page 28: Main Circuit Board , Drawing 293 X 711
C131, C132 0.47uF, 100V 04-5776 C133 0.1uF, 100V 04-5792 TRANSISTORS Q100 SI2301BDS-TI 07-6486 Q102 SI2301BDS-TI 07-6486 Q103, Q104 2N7002LT1G 05-5840 INTEGRATED U100, U101 LMC7111BIM5X 06-6410 CIRCUITS U102, U103 MAX4542ESA 06-6453 U104 LMC7111BIM5X 06-6410 Ludlum Measurements, Inc. Page 19 May 2020... - Page 29 27K, 250mW, 1% 12-7243 R118 82.5K, 250mW, 1% 12-7849 R119 1M, 250mW, 1% 12-7844 R121 182K, 250mW, 1% 12-7860 R122 90.9K, 250mW, 1% 12-7224 R124 61.9K, 250mW, 1% 12-7026 R125 499K, 250mW, 1% 12-7037 Ludlum Measurements, Inc. Page 20 May 2020...
- Page 30 13-8081 P102 53014-0610MOLEX 13-8974 P103 640456-5 MTA100×5 13-8057 P104 640456-4 MTA100×4 13-8088 SWITCHES SW100 3S1-SP9-B8-M2QE 7464-186 SW101 D5G0206S-9802 08-6761 SW102 3S1-SP9-B8-M2QE 7464-186 SW103 A123S1CWCQ 08-6781 JP100 5-146280-3 13-8571 MISCELLANEOUS L100, L101 22uH 21-9808 Ludlum Measurements, Inc. Page 21 May 2020...
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Page 31: Electrometer Board , Drawing 293 X 670
500G, 330mW, 20% 12-7248 1M, 1/4W, 1% 12-7844 27K, 1/4W, 1% 12-7243 Bobbin Assembly 4293-541 RELAYS SPST-NC MDSR-7 Reed Assy. 7293-532 Bobbin Assembly 4293-538 SPDT MDRR-DT Reed Assy. 7293-543 CONNECTORS 1-640456-0 MTA100×10 13-8066 103186-1 13-847 Ludlum Measurements, Inc. Page 22 May 2020... -
Page 32: Drawings
Section 9 Section Drawings MAIN BOARD SCHEMATIC, Drawing 293 × 711 (4 Sheets) MAIN BOARD LAYOUT 293 × 712A (2 Sheets) ELECTROMETER BOARD, Drawing 293 × 670 ELECTROMETER BOARD LAYOUT 293 × 671 Ludlum Measurements, Inc. Page 23 May 2020...
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