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Thank you for buying a Trek instrument. This instrument has been designed and built to high standards to give you years of trouble-free service. If you have any questions, please feel free to contact your Trek Representative at: Write: TREK, INC.
Do Not Operate Without Covers To avoid electric shock or fire hazard, do not operate this instrument with the covers removed. Fuses There are no user serviceable fuses inside this unit, please refer all problems to Trek, Inc. or an authorized Trek service center.
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Safety Safety Precautions (cont.) Indoor Use Only This instrument is intended for indoor use only. Do Not Operate in Wet or Damp Conditions To avoid electric shock, do not operate this instrument in wet or damp conditions. Do Not Operate in an Explosive Environment To avoid injury or fire hazard, do not operate this instrument in an explosive environment.
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Safety Safety Terms and Symbols Terms in the Manual These terms may appear in this manual: Warning: Warning statements identify conditions or practices that could result in injury or loss of life. Caution statements identify conditions or practices that could result in Caution: damage to this product or other equipment.
Model 156A: 1. Refer all maintenance procedures to qualified personnel. 2. Prior to performing maintenance procedures, turn off the 156A and disconnect the battery charger/eliminator from its power source. Failure to observe this precaution could result in an electrical shock.
Preface This manual provides user information for the Model 156A Charged-Plate Monitor and contains the following chapters and appendixes: • Introduction contains a brief product description and describes an incoming confidence test for the unit. contains initial setup information for the Model 156A.
This manual provides instructions to install and operate the Trek Model 156A Charged-Plate Monitor. We recommend you take the time to read this manual to take full advantage of the features and benefits of the instrument.
START voltage. The time required to discharge the ion collecting plate from the programmed START voltage to the programmed STOP voltage is measured by the Model 156A. The discharge is due to ‘incident ion flow’ on the ion collecting plate.
Do not turn on the 156A until instructed to do so. To do so before the Warning: appropriate point in time could result in an electrical shock and/or damage to the instrument.
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STOP voltage’ on page III-5 for information on changing the decay stop voltage.) At the programmed stop voltage the decay timer will stop and the decay time will be indicated on the DECAY TIME display. This completes the incoming confidence test. Turn OFF the 156A. I - 4...
Please contact TREK, Inc. or an authorized service organization for battery replacement information. Battery Charger/Eliminator Connection The Model 156A is designed to be battery operated or operated while connected to a line voltage source. A battery charger/eliminator is available for all nominal line voltages.
Before operating the Model 156A, the following connections should be made: Ground Connection The Model 156A must be connected to a solid ground reference to ensure accurate and repeatable measurements. All voltage measurements will be made with respect to this ground reference point. The power to the unit should be OFF when connecting the ground on the rear panel of the unit to a ground reference.
Warning: The Model 156A is battery operated and high-voltage may be present at the ion collecting plate or ion plate connector whether or not the battery charger/eliminator is connected to the rear panel when the POWER switch is...
POWER DECAY FLOAT VOLTS SECONDS DECAY FULL MODEL 156A CHARGED PLATE MONITOR SYSTEM CHARGE Figure 3-2: Front Panel Features (cont.) This digital display indicates the plate voltage in PLATE VOLTAGE Display: volts. This digital display indicates the time in seconds for the 6.
5. ION COLLECTING PLATE Receptacle: This BNC receptacle is for connection of the ion collecting plate. The Model 156A is battery operated and high-voltage may be present at Warning: the ion collecting plate or ion plate connector whether or not the battery charger/eliminator is connected to the rear panel when the POWER switch is ON.
Operation FLOAT Mode Operation In the FLOAT mode, the 156A monitors the voltage on the plate caused by air ion imbalance. 1. Place the ion collecting plate in the area to be monitored. 2. Place the MODE switch in the FLOAT mode.
Operation Programming Operation The Model 156A can be operated in any one of three modes, the (+) DECAY mode, the (-) DECAY mode, and the FLOAT mode. When the instrument is first turned on, it will indicate the revision level of the Note: program in the DECAY TIME display.
STOP voltages and resets itself to begin testing for the newly chosen parameters. The 156A will display the ‘revision level’ of the command program and then will flash the new START voltage in the PLATE VOLTAGE display and the new STOP voltage in the DECAY TIME display.
Operation Monitoring the Plate Voltage using the Output Monitor The OUTPUT MONITOR receptacle provides a low-voltage replica of the plate voltage. The OUTPUT MONITOR voltage is 1/200th of the plate voltage. The OUTPUT MONITOR can be connected to an oscilloscope for visual representation of the ion tests.
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Section IV Model 156A Specifications DANGER: This instrument is not rated for use in an explosive environment. DO NOT use it an explosive environment or an explosion may result. PERFORMANCE Monitored Voltage Range 0 to ±1100 V DC or peak AC.
Specifications Specifications (cont.) PERFORMANCE (cont.) Decay Mode Thresholds (cont.) Stop Voltage Programmable from 0 to 999 V in 1 V increments. Within ±1 V of programmed stop voltage. Stop Accuracy Plate Self-Discharge Less than 12 V/minute. (unpolarized) FEATURES A two-position rocker switch. Power On/Off Test/Reset Control A momentary toggle switch used in...
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Specifications Specifications (cont.) FEATURES (cont.) 3 ½ digit red LED display. Plate Voltage Digital Panel Meter Range 0 to ±1100 V. Resolution 1 volt. Better than 0.1% of full scale, ±1 count. Accuracy Decay Time Digital Panel Meter 4-digit red LED display. Range 0 to 9999 seconds.
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Specifications (cont.) GENERAL Power Requirements Battery Eliminator/Charger Optionally available for all nominal line voltages. Contract Trek, Inc. or an authorized service organization for more information. NOTE: If line impulses exceed 500 V when using the battery eliminator/charger, the unit may reset and require operator...
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Specifications Specifications (cont.) MECHANICAL Instrument Dimensions 83 mm H x 318 mm W x 280 mm D (3.25" H x 12.5" W x 11" D). Instrument Weight 2 kg (4.4 lb). Voltage Monitor Connector BNC coaxial connector. (3 meter length, maximum.) Ground Receptacle Banana jack.
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Specifications Specifications (cont.) Certification and Compliance TREK, INC. certifies that each Certification Model 156A is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards. A Certificate of Calibration accompanies each instrument when it is shipped from the factory.
Cycling of the battery pack can be accomplished by following the procedure below. 1) Plug the battery eliminator/charger into the Model 156A. 2) Charge the battery pack until the “Full Charge” indicator on the Model 156A is illuminated. 3) Remove the charger from the Model 156A.
5) Leave the Model 156A “ON” for more than 12 hrs. 6) Plug the battery eliminator/charger into the Model 156A. 7) Charge the battery pack until the “Full Charge” indicator on the Model 156A is illuminated. 8) Cycling is completed.
The warranty is voided if the instrument is serviced within the warranty period by anyone other than Trek, Inc. or one of its authorized service organizations. In the event of a malfunction, and the instrument must be returned for repair: 1.
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Model 156P C25x25-S3M (1 x 1 ) ....17375 SPECIAL PLATES Contact TREK, INC. or an authorized sales organization for applications that require a different size or shape ion collecting plate.
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Appendix B Warranty Statement New instruments sold by TREK, INC. (hereinafter called the “Company”) are warranted only as stated below: Subject to the exceptions and upon the conditions specified below, the Company agrees to correct, either by repair, or in the Company’s sole discretion, by replacement, any defect of...
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Please go to our web site: www.trekinc.com for a complete list of our sales and service representatives and distributors located in the United States and throughout the world. Trek Contact Information: TREK, INC. 190 Walnut Street Lockport, NY 14094-3710 USA...
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