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Ectron 441A, Инструкция по эксплуатации, Страница: 49 / 74

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Ectron 441A Скачать руководство пользователя страница 49

stitutes a single-pole low-pass filter set to approximately 1500 Hz. The output driver provides
low-impedance outputs and is limited to approximately 20 milliamperes of output current.

POWER SUPPLIES (HARDWARE)

The Ectron Model 441A contains an isolated switching power supply which runs at approxi-
mately 20 kHz. All internal circuitry operates from this module, which is transformer coupled
to provide excellent isolation from the user’s power supply.

Model 441A

Theory of Operation

5-3

Содержание 441A

Страница 1: ...on changes at any time LIFE SUPPORT POLICY Ectron products are not authorized for use in life support devices or systems without the express written approval of the President of Ectron Corporation Cop...

Страница 2: ...sequential damages as a result of an alleged breach of this warranty and in any event Ectron s liability for breach of warranty under any contract or otherwise shall not exceed the purchase price of t...

Страница 3: ...Front Panel 2 4 Retention of Settings 2 4 Input Power 2 4 Environment 2 5 Dimensions 2 5 Compatibility 2 5 Section III Operation General 3 1 Connections 3 1 Operational state Diagram 3 1 Limits vs Se...

Страница 4: ...2 Frequency and Voltage Set Points 4 2 Noise 4 3 Uncertainty and Resolution 4 5 Filtering 4 8 Input Bandwidth Filter 4 8 Output Filter 4 9 Digital Filter 4 9 Selectable Input Sensitivity 4 12 Response...

Страница 5: ...3 8 Figure 3 7 Input sensitivity Screen 3 8 Figure 3 8 Input bandwidth Screen 3 9 Figure 3 9 Output filter Screen 3 9 Figure 3 10 CAL Screen 3 10 Figure 3 11 Adjust 10 V Screen 3 11 Figure 3 12 Align...

Страница 6: ...Front panel Screens 2 6 Table 3 1 Connector pin Assignments 3 1 Table 3 2 Default Settings and Limits 3 3 Table 4 1 Input Frequency vs Output Voltage Example 4 3 Table 4 2 Response Time Versus Output...

Страница 7: ...conditioner automat ically provides stable operation for a wide range of pulse square and sine wave signals from under 10 mV to 100 V FEATURES Reliable state of the art design The Model 441A combines...

Страница 8: ...L incorporates a fixed gain logic level input detector instead of the input automatic gain control AGC of the Model 441A The Model 441AL is de signed to operate with fixed level input signals with rel...

Страница 9: ...fre quency to voltage converter it would be impossible to address every possible use for this product Rather this section is written to help the user get the most from the data resulting from using th...

Страница 10: ...resolution VU VL fU fL fL Lower frequency set point See fU g Gravitational force gram Shock resistance 20 g Weight 270 g Hz Hertz cycles per second fin can be 1 Hz to 50 kHz k Kilo 1 103 Maximum frequ...

Страница 11: ...gnal to noise ratio Table 2 1 Input Bandwidth and Sensitivity Settings Screen MIN MID MAX Input B W 10 Hz 500 Hz Wideband Input Sensitivity 200 mV peak 25 mV peak 10 mV peak All settings are nominal P...

Страница 12: ...uency settings of the instrument respectively For frequencies of 1 kHz and above VUNC 0 00122 fin 2 1 5 106 F VU VL fU fL where fin is the input frequency F is fin 1000 rounded up to the nearest integ...

Страница 13: ...input with the filter set to wideband For other filter frequen cies add 5 fco where fco is the filter cutoff frequency Update rate 0 001 s or 1 fin where fin is the frequency of the input whichever i...

Страница 14: ...s feature allows field alignment and calibration of the instrument using only a voltmeter FRONT PANEL Controls The display push button allows the operator to sequence through the various setup screens...

Страница 15: ...resistance 200 m s 2 approximately 20 g for 11 ms in any plane Vibration resistance 100 m s 2 approximately 10 g in any plane DIMENSIONS SEE DRAWING 441 900 Height panel 60 2 mm 2 37 Height case 50 8...

Страница 16: ...peak MID 25 mV p MAX 10 mV p Input bandwidth Select input bandwidth of MIN 10 Hz MID 500 Hz MAX WB Output filter Select output filter frequency of 1 Hz 10 Hz 100 Hz or WB Calibration Select calibrati...

Страница 17: ...e as for Ectron Models 352 and 428 conditioner amplifiers Therefore unless special features have been incorporated that would preclude using the Model 441A enclosures designed for these amplifiers are...

Страница 18: ...Figure 3 1 Operational state Diagram Operation Model 441A 3 2...

Страница 19: ...V higher than the lower voltage set point Lower set point 0 V 10 V to 9 9 V and 0 1 V lower than the upper voltage set point Pulses revolution ON OFF OFF ON OFF Pulses 001 001 999 Input sensitivity V...

Страница 20: ...s in an extreme temperature environment the screen will not be visible when the unit is energized It may be black or it may be blank If this occurs press and hold the display for more than one second...

Страница 21: ...encoder can change digits to either side of the digit being changed For example if the user is changing one of the voltage set points and the cursor is on the tenths digit then changing it from 9 to 0...

Страница 22: ...tion To set the upper and lower frequency set points From the OPERATE screen Press the display once To the OPERATE screen Press the display seven times or wait approximately twenty seconds Defaults 50...

Страница 23: ...at the digit to be changed Then rotate the encoder until that digit is set Continue until all the digits are set Remember that the two voltages cannot be closer to each other than 0 1 V INPUT SIGNAL...

Страница 24: ...returns to within that range Once this digital filter has been turned ON or internally reactivated one revolution must occur before the output of the Model 441A is averaged Operation Pressing the enco...

Страница 25: ...y twenty seconds Default MAX Discussion The input bandwidth can be set to MIN MID or MAX Operation Since there is only one character to change on this screen the encoder push button action has no func...

Страница 26: ...ON For example if the user has frequency set points of 1 kHz and 2 kHz and voltage set points of 1 V and 2 V he or she may want to set a CAL frequency of either the upper or lower frequency set points...

Страница 27: ...press the display once to go to positive 10 V alignment screen and adjust the encoder for 10 V 0 005 V The three digit number on each display is a reference number for the convenience of the user The...

Страница 28: ...ied If the user chooses the default settings can be restored by going to the RESET screen and selecting Y yes PUSH KNOB Reset Function To restore the default settings From the OPERATE screen Press and...

Страница 29: ...ls 352 428 441A 441AL and 451 in any combination Being small lightweight and powered either by ac or dc the enclosure is well suited for use in the field as well as the laboratory Features Inside the...

Страница 30: ...Front panel controls include power on off for ac and externally applied dc ALL ZERO for Model 428 equipped with autozero Option O and CAL with po sitions of and OPR operate which is functional when a...

Страница 31: ...provided to improve conversion stability These are a three step input sensitivity control a three step input bandwidth control and a digital periodic filter that eliminates cyclic variations in the in...

Страница 32: ...PROTECTION All connections to the converter go through emi rfi filters to minimize the effects of rf noise The filter frequency coverage starts with about 3 dB of attenuation at 1 MHz increasing to 66...

Страница 33: ...ncy to voltage sensitivity of 100 Hz V Exactly the same results would be obtained if the settings were fU 1500 Hz fL 900 Hz VU 6 V and VL 0 V The following section shows that extreme settings can resu...

Страница 34: ...g If a 10 mV p p sine wave has even 100 V of amplitude noise then timing errors can cause the frequency conversion to produce volts of output noise when the frequency input is high and the frequency s...

Страница 35: ...leads Since the input is differential this reversal will not cause noise or ground loop problems UNCERTAINTY AND RESOLUTION Output analog uncertainty is within 0 00122 1 5 106 fin 1 5 106 fin fin VU V...

Страница 36: ...h 4 5 illustrate the variation of uncertainty resolution and noise for an output of 0 V to 5 V VL to VU Different input frequencies fin are plotted against frequency set points differences fU fL Figur...

Страница 37: ...that resolution reaches a worst case of 0 015 V for input frequencies of up to 2 000 Hz and a frequency set points difference of 1000 Hz or higher Again output voltage set points are 0 V and 5 V Howev...

Страница 38: ...MAX bandwidth corresponding to a single pole low pass filter with approximate corner frequencies of 10 Hz MIN 500 Hz MID and 150 kHz MAX The proper setting for this filter de pends on the noise frequ...

Страница 39: ...requency Digital Filter For operational frequencies up to 1 kHz this unique filter uses digital averaging of the converted input signal to eliminate the unwanted effects of a signal whose fre quency v...

Страница 40: ...frequency change in Figure 4 6 is a result of the update rate of the unit which when period averaging is allowed is longer than 1 ms That is period averaging only works below 1 kHz The filtering effec...

Страница 41: ...ulses per revolution setting has been received as input the output will again show the elimination of the periodic error The user who is operating near 1 kHz should be mindful of this operation Applic...

Страница 42: ...c triggering This can occur when no signal is present or when the signal level is low Usually the optimum setting of this control is made in conjunction with the input filter setting Gain decreases by...

Страница 43: ...display will read 0 0000 If the input signal exceeds 50 kHz the read out will continue to read correctly until the frequency exceeds 63 kHz Above this frequency the read out will show dashes The analo...

Страница 44: ...mV at 10 mph to 3 V at 100 mph This signal would be ideal for the Model 441A except for the noise both common mode and normal mode that has an amplitude of from 1 V to 3 V p p Obviously without filter...

Страница 45: ...used for mounting components of this filter Note that the noise filter has different characteristics for differential signals than for common mode signals Best results were obtained feeding the ABS s...

Страница 46: ...Applications Model 441A 4 16...

Страница 47: ...flow and as such describes the hardware signal conditioning first then the firmware and then the hardware output stages The power supply discussion is placed after the signal flow discussion Refer to...

Страница 48: ...lated until one millisecond has elapsed Frequency is then determined by dividing the number of transitions accumulated by the period of time required to accumulate those tran sitions Granularity in pe...

Страница 49: ...imately 20 milliamperes of output current POWER SUPPLIES HARDWARE The Ectron Model 441A contains an isolated switching power supply which runs at approxi mately 20 kHz All internal circuitry operates...

Страница 50: ...Theory of Operation Model 441A 5 4...

Страница 51: ...ivalent Frequency meter if necessary Needed if not already present in the DMM being used and if the function generator does not provide a precise reading of the frequency Power supply Any 10 5 V dc to...

Страница 52: ...esent on the oscil loscope Increase the frequency on the function generator until the waveform disappears on the oscilloscope Record the highest frequency for which the Model 441A pro duces an output...

Страница 53: ...r frequency to 00000 Press the display seven times or wait approximately twenty seconds to return to OPERATE Set the function generator to 1 kHz When the DMM s reading stabilizes record the voltage Pr...

Страница 54: ...nt While still at VIEW ANGLE press the display once to go to ADJUST 10 V Adjust the encoder until 10 000 V 0 005 V is obtained on the DMM The three digits on this display maximum range of 750 counts a...

Страница 55: ...lay again to go to VOLTS Set the Upper voltage to 10 0 and the Lower voltage to 00 0 Press the display twice more to go to INPUT SENS The OUTPUT FILTER need not be set at this time and rotate the enco...

Страница 56: ...ettings listed in Table 6 1 and repeat the above sensitivity tests Repeat the previous paragraph with the function gener ator output adjusted to 20 V p p You will have to move to the Hi Output on the...

Страница 57: ...Calibration 50 kHz ______________V 10 V 0 0079 V 1 kHz ______________V 10 V 0 0079 V ALIGNMENT Frequency Range 10 V ______________V 10 V 0 005 V 10 V ______________V 10 V 0 005 V POST CALIBRATION Freq...

Страница 58: ...Alignment and Calibration Model 441A 6 8...

Страница 59: ...x Inc 00074 Augat Interconnection 00834 Sprague Electric Co 00091 Bendix Corp 00845 Standard Power Inc 00127 Bussmann Div 00863 Switchcraft Inc 00128 C K Components Inc 00949 Useco 00166 Circuit Assem...

Страница 60: ...N 00091 PT06A 10 6P SR 1 310506 0 P7 CONNECTOR 3 PIN 00091 PTO6A 12 3S SR 1 310103 1 PS1 OPTION X POWER SUPPLY 28 V 01302 R50U 24 N 5 120026 0 PS1 OPTION Y POWER SUPPLY 12 V 01302 R50U 12 N 5 120025 0...

Страница 61: ...CLE POWER 00863 EAC 309 3 840043 0 P1 P14 CONNECTOR 6 PIN 00091 PT06A 10 6P SR 1 310506 0 P43 CONNECTOR 3 PIN 00091 PTO6A 12 3S SR 1 310103 1 PS1 OPTION Y POWER SUPPLY 01302 R50U 12 N 5 120025 0 PS1 O...

Страница 62: ...Parts Lists Model 441A 7 4...

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Страница 67: ...TO SQUARE M BLK 22GA TO XF2 GRY 22GA TO PS1 BLU 24GA TO SQUARE P YEL 22GA TO CIRCLE T WHT YEL 24GA TO SQUARE N BRN 22GA TO PS1 ACL REAR VIEW S1 S3 ORN 24 GA TO CIRCLE S WHT ORN 24GA TO CIRCLE R S2 YE...

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Страница 69: ...CONFIGURATIONS PT06A 10 6P SR B B 5 C D TYPICAL A A B D C E F A B D C E F B F C D J1 J14 CH1 CH6 PT02A 10 6S CONNECTOR INPUT E D A 1 4 BRIDGE FULL BRIDGE 3 WIRE TYPICAL CUSTOMER...

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Страница 73: ...TLINE 408 1 MATERIAL TITLE FINISH SCALE NOTED 1 1 408 900 A REV DWG NO SHEET OF 24856 C FINAL ASSY NONE DRAWN NONE SIMILAR TO J JACOB DESIGN CHECKED APPROVED SIGNATURES FED SUPP CODE NO DWG SIZE DATES...

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