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KLEINWACHTER CPM374 CHARGED PLATE MONITOR 
with integrated Electro-Fieldmeter 
SYSTEM PROF. DR. ING. HANS KLEINW?CHTER 
 
The CHARGE PLATE Monitor 374 measures the voltage potential on its integrated Plate-Electrode according the Fieldmill-Influence-Principal and is suitable to determine the Static Decay Time from a selected higher voltage threshold to a lower voltage threshold level. 
  
CPM374 
Forschungs-. Entwlcklungs-. Produktlons-u. Vertrlebsges.m.b.H
 
The CHARGE PLATE Monitor CPM374 consists of an integrated timer, a high-voltage unit and an electro-fieldmill-sensor and achieves therefore the high impedance of 10
15 W to measure electrostatic voltage potentials and static decay times of air ionizer equipment. 
 
The unit meets the requirements of the Standard IEC 61340-5-1 and the American Standard EOS/ESD S.3.1.  
 
For the vertical measurement use the included three Distance pieces. Screw them on the backside of the unit. 
 
Important: The high voltage unit is protected by a high ohmic current limiting resistor and therefore there is no danger when touching the charged plate. 
 
The CPM374 is battery powered and due to its compact design, it is very suitable for the use in industrial areas. It can also be operated at a power supply (230/115 VAC). The CPM374 is menu-driven and will be controlled by means of 2 switches for simple operation. All selected parameters will be shown in the 2 rows LCD-display for a better orientation of the operator.  
 
The enclosed software enables the remote control operation of the CPM374 and data processing by means of a PC. 
 
2.1  Switching on  
The CHARGE PLATE Monitor CPM374 is equipped with a NiCd-battery and ready for operation - use the enclosed power supply only to charge the battery. The display background illumination is not operating when battery powered. The battery operation features an automatic switch-off function, if the switches were not touched for 
approximay 10 minutes. when the unit is run on the power supply (230/115 VAC) the background illumination is switched on while the automatic switch-off function is disabled. 
 
Press button B to switch on the CPM374. 
  
1.  Description 
2.  Operation 
2.2  Decay Time and Offset Voltage 
 
The software version will be shown shortly before the measurement mode and the command to initiate the measurement appear on the display: 
 
DECAY TIME: AUTO 
PRESS START! 
 
The initially setting is saved in the EEPROM and will be shown after each switch-on. 
 
If the auto-mode is selected, as indicated in the example above, then the time will be measured for the positive voltage decay first and then followed automatically for the negative. This mode is recommended for checking air ionizer equipment, as the Startbutton has to be pushed on time only to perform a complete check of ionizers including the determination of the Offset Voltage. 
 
Offset-Voltage is the voltage potential, which remains after a certain time on the plate electrode. It is an indication for the balance of positive and negative ions. If the Offset- Voltage is positive, then an excess of positive ions emanate from the ionizer equipment - the other way round for negative. Please consider the specification of the ionizer for a qualified evaluation. 
 
The Start-button has to be pressed in order to charge the plate-electrode by means of the integrated high-voltage unit. The timer setting and the applied voltage potential are shown on the display: 
 
TIMER: 1000-100V 
U = XXXXV 
 
The timer starts as soon as the upper threshold value (1000 volt in this case) is passed: 
 
TIMER=XX.Xs 
U = XXXXV 
 
and will stop the decay time when reaching the lower value (100 volt). The voltage setting for the timer could be changed in the set-up function. 
 
The offset-voltage will be measured after a certain lapse time at the end of the static decay time measurement: 
OFFSET=XXXs 
U = XXXXV 
 
The measurement series is now finished and all relevant parameters can be obtained from the display, e.g. to qualify an air ionizer equipment. The offset-voltage UOFF and the belonging lapse time will be finally displayed in the first row for 10 seconds or until a new measurement was initiated by pressing button A. 
 
 The decay time appears in the second row as POS DECAY or as NEG DECAY or both  alternating every second, if the auto-mode was pre-selected: 
 
UOFF=XXXV T=XXXs 
POS.DECAY =XX.Xs 
 
2.3  Saving measurement values  
The measured values can be saved in the internal memory, therefore the request will follow after each measurement accordingly:  
SAVE VALUES? 
A<YES NO>B 
 
press the button A to start the saving. In case that the memory is full (99 entries), the display will indicate for approximay 2 seconds: 
 
MEMORY FULL! 
 
All files have to be deleted in order to perform the saving of the last measurement: The following request will appear on the screen:  
DELETE FILES? 
A<YES NO>B 
 
In case, that the full memory should not be deleted, please press B and the unit will be ready to take the next measurement - the last measurement results will disappear and cannot be saved. 
 
Important: It is recommended to transfer all files to your PC after each measurement interval by means of the enclosed software. Thus will allow to delete files of 
the CPM374 at the next measurement interval without loosing important data. 
 
Press A to delete the full memory of the CPM374 and the proposal for the file number of the last measurement will appear: 
 
FILE NO: XX 
A<OK CHANGE>B 
 
Press A to confirm this file number or change with each press of B until you reach the right file number. Finally, press A to confirm the right file number. 
In order to reach faster a certain file number press B, then the ten digit can be changed by pressing A while the single digit can be changed with B. when you have reached the right file number, wait for approximay 3 seconds until the display change back as stated above and confirm the setting by pressing A. 
 
Press A and B simultaneously to start the set-up function. The CPM374 will ask for performing the set-up function:  
SET-UP ? 
A<YES NO>B  
 
3.1  SET-UP  
If the set-up function was started, the last Static Decay and Offset setting will appear (in this case Mode = Auto), which can be confirmed again by pressing A:  
MODE = AUTO 
A<OK CHANGE>B 
 
If B will be pressed, the following options are shown one after the other: 
MODE = POS 
MODE = NEG 
MODE = VOLTMETER 
MODE = AUTO 
 
The decay time for only positive respectively negative potentials with the following offset voltage are measured in the MODE = POS and MODE = NEG. In the MODE = 
VOLTMETER, the CPM374 will measure permanently the voltage potential on the plate electrode - Use a measurement lead connected to the plate electrode to operate the 
CPM374 as an Electrometer (High Impedance Voltmeter), e.g. monitoring the change of voltage potential on human bodies, caused by movements. 
 
If you have selected the decay time measurement (MODE = POS, MODE = NEG or MODE = AUTO), the starting point for the voltage potential, from where on the decay time 
should be measured, will be asked first:  
START: U=1000V 
A<OK CHANGE>B 
 
Press A to confirm the proposed starting point. If B will be pressed, the following options are shown one after the other:  
500V - 550V - ... - 900V - 950V - 1000V - 500V 
 
and the selected value has to be confirmed by pressing A . 
 
 
3.  SET-UP Function  
The same procedure will follow selecting the stop point, that means at which potential the decay time should be stopped:  
STOP: U=100V 
A<OK CHANGE>B 
 
Press A to confirm the proposed stop point. If B will be pressed, the following options are shown one after the other:  
0V - 50V - 100V - ... -400V - 450V - 500V - 0V 
 
and the selected value has to be confirmed by pressing A .  
Finally, the CPM 374 will ask for the lapse time to determine the offset voltage:  
OFFSET: XXXs 
A<OK CHANGE>B 
  
Press A to confirm the proposed lapse time. If B will be pressed, the following options are shown one after the other:  
10s - 20s - ... - 50s - 1min - 2min- ... - 10min - 10s 
 
and the selected value has to be confirmed by pressing A  . 
The chosen parameters for Start, Stop and Offset will be shown for approximay 3 sec, 
e.g.: 
TIMER: 1000-100V 
OFFSET: XXXs 
 
and finally the unit will recheck if all parameters are chosen correctly:  
TIMER+OFFSET OK? 
A<YES NO>B 
 
The selected parameters will be confirmed by pressing A and could be changed again with B. 
When A was pressed, the unit will ask for clearing the memory, as the stored data files are based on the previous setting:  
CLEAR MEMORY? 
A<YES NO>B 
 
 
If B was pressed, the previous setting will remain the same, the memory was not deleted and the new parameter change is ignored, the following message will appear: 
 PARAMETER 
NOT CHANGED ! 
 
If A was pressed, then following message will advice that the parameter change was taken over and the memory is cleared accordingly, the following message will appear for approximay 2 sec:  
PARAMETER 
CHANGED ! 
 
The display will show now the new decay time setting and the request to press start! 
 
3.2  Calibration  
If NO>B was chosen for the set-up function, the unit will ask for the Electro-Fieldmeter calibration:  
EFM CALIBRATION? 
A<YES NO>B 
 
Press B if a calibration is not required. Press A to initiate the automatic offset calibration, the following message will appear for approximay 1 sec:  
PLEASE WAIT 
CALIBRATION 
 
Important: The plate electrode must be free of foreign voltage connection during calibration. 
 
The display will show the new decay time setting and the request to press start! 
 
If the electrofield-meter is defected, the following message will appear:  
EFM DEFECT! 
REPAIR IS NEEDED 
 
If the power of the NiCd Battery is less than 6,7 volts, the unit will provide the following message alternating every second with the actual first row: 
 
LOW BATTERY!  
 
4.  Other messages on the display 
The battery has to be recharged, but the ongoing or the upcoming measurement could be finished first.  
 
Important:  
Please use the enclosed battery charger only for charging the batteries. The batteries will also be charged when the CPM374 is switched off. The max. charging time is 14 hours, but the unit could be longer connected to the battery charger as it consists of a charging control device. It is recommended to use the CPM374 until LOW BATTERY! appears on screen. This will maintain the max. battery capacitance over a longer period. 
 
If the battery voltage will become less than 6,1 volts, the following message will appear on screen for approximay 2 seconds:  
AUTO OFF 
LOW BATTERY! 
 
and the unit will switch off automatically to prevent a total discharge of the battery. A total discharge can cause damage or destroy the battery! 
Connect the unit by means of the provided cable to a COM socket of a PC. Insert the floppy disk and select the right drive (e.g. A:). Type ?START“ and press ENTER, the software will be installed on your PC. 
 
Requirements: 
min. 486 processor, 3.5“ floppy disk drive, 2 MB RAM, DOS or Windows. the program is self explaining. 
We provide 12 month warranty from date of receiving the unit, if the unit was handled properly. The damage of the NiCd-battery caused by improper handling as well as 
mechanical damage on the unit are excluded from warranty. Warranty is not provided, if the housing was opened. 
 
5.  PC-Operating 
6.  Warranty 
The unit has to be grounded sufficiently for accurate measurements of the electrical field and its polarity. Therefore the unit has to be connected to ground potential by means of its grounding socket. 
 
Housing :  Aluminum-housing 152mm x 152mm x 152mm (L x W x H) 
Weight :  1,5 kg 
Display :  Alphanumeric Display, 2 rows with 16 digits each, 
display area 100 mm x 24 mm 
Measurement Range :  Voltage potentials up to ± 1200 V, accuracy ± 2,5% 
PC-Interface :  Serial port, 9 pol Sub D – socket 
Battery :  7,2 V / 850 mAh 
last approximay 4 hours for continuous operation when 
battery was fully charged, charging time max. 14 hours 
Battery Charger :  12 V / 500 mA 
Load Current:  max. 350mA, max. 150 mA for battery operating 
Operating Temperature:  0 ... 40°C 
Relative Humidity:  0 ... 60% 
 
·  CHARGE PLATE Monitor CPM 374 
·  Power transformer prim: 230VAC sec: 12VDC 500mA 
·  Teflon insulated measurement lead, 1m 
·  Crocodile clip 
·  Grounding cable 
·  Serial PC-port cable 
·  3 Spacers for horizontal decay time measurement 
·  Operating Instructions 
·  Certificate of factory calibration 
 
  
7.  Grounding 
8.  Specification 
9.  Parts of Delivery 
 
The measurement unit is not approved for the use in explosive areas! 
The unit is not approved for the use in power utilities! 
This unit is not suitable to measure alternating fields with a frequency higher than 1 Hz. 
Sparking discharge to the electro-fieldmill-sensor has to be avoided. 
 
The Teflon-supports of the plate electrode must be maintained clean, therefore do not touch with fingers. All Teflon spacers and the teflonisolated wire to the plate have to be cleaned carefully with Acetone or similar solvents in case that the voltage on the charged plate drops in a rate of greater than 100V / minute under normal circumstances (no external lead connection to the plate electrode and no presence of air ionizers). The interval for factory calibration is normally 1 year. 
 
 
Please note the following advice when checking air ionizers: 
The presence of charged objects as well as personnel could cause failure on the measurement results caused by influence of voltage. The unit should be therefore always 
grounded to avoid this phenomena from the housing of the unit itself. 
 
 
10.  Safety Advice 
11.  Maintenance 
12.  Important Notice 
 
KONFORMIT?TSERKL?RUNG 
 
Die Firma 
 
Kleinw?chter GmbH 
Krummattstr. 9 
79688 Hausen i.W. 
 
erkl?rt in alleiniger Verantwortung, dass das Produkt 
 
Charge Plate Monitor CPM 374 
Messger?te zur Messung des elektrischen Gleichspannungsfeldes 
 
auf die sich diese Erkl?rung bezieht, die Forderung 
 
der EWG-Richtlinie über die elektromagnetische Vertr?glichkeit 
Richtlinie des Rates vom 3.5.1989 (89/336) Stand: Juli 1993 
 
erfüllt, insbesondere der Normen 
 
EN 61010 ?Safety“ 
EN 55011 Gruppe 1, Klasse B 
EN 50082-2/92 
 
für ISM-Ger?te. 
 
Die Firma Kleinw?chter GmbH h?lt folgende technischen Dokumentationen zur Einsicht bereit 
 
·  vorschriftsm??ige Bedienungsanleitung 
·  Baupl?ne 
·  technische Dokumentationen 
 
Hausen, den 09.01.2002 
 
 
Jürgen Brunner 
techn. Gesch?ftsführer 
 
 
KLEINWACHTER
Forschungs-. Entwlcklungs-. Produktlons-u. Vertrlebsges.m.b.H

中國電子行業(yè)儀器儀表供應商——上海堅融實業(yè)有限公司      ：www.tailongme.com  
凌志堅 產(chǎn)品     ：        
：jet1718  地址：上海市閔行區(qū)閔北工業(yè)園區(qū)紀王鎮(zhèn)紀西周涇 9 號/68 號