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GE Medical Systems Corometrics 340 Service Manual Download Page 41

Revision A

Model 340 Telemetry System

4-1

2006920-001

Chapter 4

Theory of Operation

4

This section of the manual contains the electronic theory for the Model
340 Maternal/Fetal Telemetry System. The Model 340 Telemetry
System is comprised of a receiver and a transmitter. The electronic
theory for the transmitter (Transmitter Board and Transmitter Carrier
Board) and receiver (Receiver Board and Receiver Carrier Board) is
presented. For complementary information, refer to the schematics and
assembly drawings contained in Chapter 9 of this manual.

This chapter contains the following technical information:

Transmitter Board (No. 2003708-001)

. . . . . . . . . . . . . . . . .

Telemetry Receiver Board Circuitry (No. 13856A)

. . . . . . . .

Telemetry Transmitter Carrier Board (2003713-001)

. . . .

Telemetry Receiver Carrier Board (2004163-001)

. . . . . . .

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Summary of Contents for Corometrics 340

Page 1: ...Corometrics Model 340 SERVICE MANUAL MANUAL P N 2006920 001 REV A IUP TOCO XXX 340 Telemetry Receiver REFER TO MANUAL FOR PROPER TRANSDUCERS ULTRASOUND ECG UA XXX 340 Telemetry Transmitter ...

Page 2: ......

Page 3: ...Corometrics Model 340 SERVICE MANUAL MANUAL P N 2006920 001 REV A IUP TOCO XXX 340 Telemetry Receiver REFER TO MANUAL FOR PROPER TRANSDUCERS ULTRASOUND ECG UA XXX 340 Telemetry Transmitter ...

Page 4: ...ms for damage in shipment should be filed promptly with the transportation company All correspondence covering the instrument should specify the model and serial numbers GE MEDICAL SYSTEMS Information Technologies A GE Medical Systems Company Revision A 04 01 GE Medical Systems Information Technologies will make available on request such circuit diagrams component diagrams component parts lists de...

Page 5: ... Original Release and Model 340 Plus Telemetry Systems xi Identifying a Model 340M Telemetry System xii 1 Safety 1 1 General Information 1 2 General Use 1 2 Responsibility of the Manufacturer 1 2 Definitions of Terminology 1 3 Equipment Safety Information 1 4 Warnings 1 4 Cautions 1 7 Equipment Symbols 1 8 FCC Information 1 9 FCC Rules Compliance 1 9 FCC RF Exposure Compliance 1 9 FCC Service Info...

Page 6: ...Panel 3 8 Transmitter Rear Panel Battery Compartment 3 10 4 Theory of Operation 4 1 Transmitter Board No 2003708 001 4 2 Ultrasound 4 2 UA 4 4 ECG 4 4 Control Circuitry 4 5 Power Supply 4 6 Telemetry Receiver Board Circuitry No 13856A 4 7 The RF Receiver 4 7 Receiver Encoded Modulation 4 8 TOCO Channel 4 9 ECG Channel 4 9 Ultrasound Channel 4 10 Power Supply Circuitry 4 10 Telemetry Transmitter Ca...

Page 7: ...l 5 7 Mode Controls 5 8 RF Carrier Detect 5 9 Mode Outputs 5 10 Pulsed Doppler Ultrasound Audio Converter 5 10 Ultrasound Modulator 5 11 Transmitter Calibration 5 12 UA Channel 5 12 ECG Channel 5 12 Main Oscillator 5 13 Power Supply 5 13 6 Maintenance 6 1 General Cleaning Precautions 6 2 Cleaning the Transmitter and Receiver 6 3 7 Troubleshooting 7 1 Problem Chart 7 2 8 Technical Specifications 8 ...

Page 8: ...iv Model 340 Telemetry System Revision A 2006920 001 For your notes ...

Page 9: ... REF Number xi Figure 1 2 Model 340M REF Number xii Figure 3 1 Receiver Front Panel 3 2 Figure 3 2 Receiver Rear Panel 3 4 Figure 3 3 Transmitter Bottom Panel 3 6 Figure 3 4 Transmitter Top Panel 3 8 Figure 3 5 Transmitter Rear Panel Battery Compartment 3 10 Figure 5 1 Summary of Test Equipment 5 3 ...

Page 10: ...For your notes ...

Page 11: ...le 3 1 Receiver Front Panel 3 3 Table 3 2 Receiver Rear Panel 3 5 Table 3 3 Transmitter Bottom Panel 3 7 Table 3 4 Transmitter Top Panel 3 9 Table 5 1 Power Supply Voltages 5 5 Table 5 2 Band Pass Filter Center Frequencies and 3 dB Points 5 8 Table 5 3 Center Frequencies of Tone Decoders 5 8 Table 5 4 Tone Decoder Output Locks 5 9 Table 5 5 Open Collector Transistor Switch Testing 5 10 Table 7 1 T...

Page 12: ...For your notes ...

Page 13: ...ion A Model 340 Telemetry System ix 2006920 001 Preface Overview of Telemetry Systems 1 This chapter provides an overview of the 340 Series of telemetry systems About Your System x Identifying Your System xi ...

Page 14: ...s also operates in the frequency range 430 470 MHz offering additional channel numbers than the original Model 340 In addition the Model 340 Plus offers flexibility by allowing factory re programming to an alternative channel number should interference become a factor in your location Model 340M The Model 340M operates in the frequency range 608 614 MHz where the M indicates medical The Model 340M...

Page 15: ... the following page Identifying Model 340 Original Release and Model 340 Plus Telemetry Systems If your device s REF number beings with 0 u the fourth character identifies receiver or transmitter u the fifth character identifies Model 340 Original Release or Model 340 Plus Refer to Figure 1 1 Figure 1 1 Model 340 or Model 340 Plus REF Number Example 1 If a serial number label shows REF 0341AAN 501...

Page 16: ...40M REF Number Example 1 If a serial number label shows REF 341MCCN XXX00A it is a receiver from a Model 340M telemetry system Example 2 If a serial number label shows REF 342MBBN XXX000B it is a transmitter from a Model 340M telemetry system 3 4 _ M _ _ _ _ _ _ _ _ _ Product Code Catalog Number Other Device Characteristics 1 Telemetry Receiver 2 Telemetry Transmitter Option Language Voltage Speci...

Page 17: ...erves to enhance equipment reliability This chapter describes how the terms Danger Warning Caution Important and Note are used throughout the manual In addition standard equipment symbols are defined This section includes the following important information General Information 1 2 Definitions of Terminology 1 3 Equipment Safety Information 1 4 Equipment Symbols 1 8 FCC Information 1 9 ...

Page 18: ...tegrity of the equipment is in doubt test all functions Refer to the Maternal Fetal Monitoring Operator s Manual for information concerning the limitations of internal and external fetal heart rate monitoring techniques Responsibility of the Manufacturer GE Medical Systems Information Technologies hereinafter Information Technologies is responsible for the effects on safety reliability and perform...

Page 19: ...nger A DANGER notice indicates an imminently hazardous situation which if not avoided will result in death or serious injury Warning A WARNING indicates a potentially hazardous situation which if not avoided could result in death or serious injury Caution A CAUTION indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury Cautions are also used to avoi...

Page 20: ...ds into the patient cable which in turn connects to the transmitter The receiver is connected to the wall socket by the power cord Do not plug the electrode leads into the power cord a wall socket or an extension cord DEFIBRILLATION This equipment is not designed for use with defibrillators ELECTRICAL SHOCK To reduce the risk of electrical shock do not remove equipment covers Refer servicing to qu...

Page 21: ...ntervals by a qualified care provider who will make diagnoses and decide on treatments and interventions INTERFACING OTHER EQUIPMENT Monitoring equipment must be interfaced with other types of medical equipment by qualified biomedical engineering personnel Be certain to consult manufacturers specifications to maintain safe operation LEAKAGE CURRENT TEST The interconnection of auxiliary equipment w...

Page 22: ... the pacemaker rate during occurrences of cardiac arrest or some arrhythmias Do not rely entirely upon rate meter alarms Keep pacemaker patients under close surveillance Refer to your monitor s operator s manual for disclosure of the pacemaker pulse rejection capability SIMULTANEOUS DEVICES Do not simultaneously connect more than one device that uses electrodes to detect ECG and or respiration to ...

Page 23: ...ogies Service Representative DAILY INSPECTION It is essential that the equipment and accessories be inspected prior to every use ENVIRONMENT The performance of the equipment has not been tested in certain areas such as x ray and imaging suites The equipment is not recommended for use in these environments PERFORMANCE Report all problems experienced with the equipment If the equipment is not workin...

Page 24: ...application TYPE BF EQUIPMENT Type BF equipment is suitable for intentional external and internal application to the patient excluding direct cardiac application Type BF equipment has an F type applied part DEFIBRILLATOR PROOF TYPE BF EQUIPMENT Type BF equipment is suitable for intentional external and internal application to the patient excluding direct cardiac application Type BF equipment is ty...

Page 25: ... FCC RF exposure compliance requirements users should avoid grasping the antenna for any extended period of time while the device is in operation FCC Service Information Servicing the radio frequency transmitter and receiver sections of the Model 340 Telemetry System requires an FCC General Radio Telephone License Any changes or modifications made to the Model 340 Telemetry System that are not exp...

Page 26: ...eliability of this important service The FCC allocated 14 MHz of spectrum for use by medical telemetry equipment in the 608 614 MHz 1395 1400 MHz and 1429 1432 MHz bands This allocation was based on a needs assessment conducted by the American Hospital Association AHA The 608 614 MHz band which corresponds to TV channel 37 had been reserved for radio astronomy uses so this action elevates medical ...

Page 27: ...Revision A Model 340 Telemetry System 2 1 2006920 001 Chapter 2 Introduction 2 This chapter contains the following information Product Summary 2 2 Product Features 2 3 ...

Page 28: ...Model 115 n Model 116 n Model 118 n 120 Series n Model 145 n Model 150 n Model 151 n Model 155 n 170 Series 127 The Model 340 Telemetry System does not support fetal movement detection The system monitors ultrasound ECG FECG or MECG and uterine activity TOCO or IUPC signals individually or in combination depending on which parameters are available in the fetal or maternal fetal monitor Refer to yo...

Page 29: ...cers are interchangeable u 120 Series ECG rectangular connector cables are not compatible round connector cables are compatible u Models 115 and 145 cat no REF 5600 ultrasound transducers cannot be used with a Model 340 Use only cat no REF 5700 transducers when the using a Model 115 or 145 with a Model 340 Telemetry System n Provides simultaneous monitoring of two heart rates twins or maternal fet...

Page 30: ...2 4 Model 340 Telemetry System Revision A 2006920 001 For your notes ...

Page 31: ...Model 340 Telemetry System 3 1 2006920 001 Chapter 3 Controls Indicators and Connectors 3 This section describes all controls indicators and connectors on a Model 340 Telemetry System Receiver 3 2 Transmitter 3 6 ...

Page 32: ...2 Model 340 Telemetry System Revision A 2006920 001 Controls Indicators and Connectors Receiver Receiver Receiver Front Panel Figure 3 1 Receiver Front Panel IUP TOCO XXX 340 Telemetry Receiver A B C D E ...

Page 33: ...ber of the receiver must be identical to the channel number of the transmitter Also if you have more than one telemetry system or other RF devices each system must have a unique channel number C Power Switch and Indicator The Power switch turns the receiver on I and off O When set to on the green Power indicator illuminates D Low Battery Indicator The red Low Battery indicator flashes when you hav...

Page 34: ...ctors Receiver Receiver Rear Panel Note Antenna shown removed Figure 3 2 Receiver Rear Panel ANTENNA OUTPUTS TO MONITOR CONNECT TO COROMETRICS MONITORS ONLY ULTRASOUND ECG UA WARNING TO REDUCE FIRE HAZARD REPLACE FUSE AS MARKED CAUTION 120Vac 120V 50 60HZ 30W 0 25A SLOW BLOW A E D C B ...

Page 35: ...anel inputs are ignored In other words telemetry and monitor modes cannot be mixed and matched you must use telemetry only or direct monitoring only For proper operation with a 170 Series Monitor disconnect all transducers from the front panel of the monitor C US ECG UA and Mark Connectors These connectors are used with Models 115 116 118 145 150 151 and 155 Monitors only Do not use this connectio...

Page 36: ...3 6 Model 340 Telemetry System Revision A 2006920 001 Controls Indicators and Connectors Transmitter Transmitter Transmitter Bottom Panel Figure 3 3 Transmitter Bottom Panel A C B ...

Page 37: ...ers are not compatible with the Model 340 Telemetry System The 5600 Series Transducer was designed for use with Models 115 and 145 Monitors and Models 320 and 330 Telemetry Systems B ECG Input Connect an FECG cable legplate or MECG cable plug to this grey receptacle This connector is compatible with all round connector FECG MECG patient cables used with Corometrics brand monitors C UA Input Connec...

Page 38: ...3 8 Model 340 Telemetry System Revision A 2006920 001 Controls Indicators and Connectors Transmitter Transmitter Top Panel Note Antenna shown removed Figure 3 4 Transmitter Top Panel A B C D E A ...

Page 39: ...nal is transmitted and one of the following marks prints on the strip chart paper n This annotation is commonly used to record an event This mark is available on all Corometrics brand monitors n This annotation is commonly used as an indication that the mother has perceived fetal movement Refer to your monitor s operator s manual to learn if your monitor supports this feature Refer to your monitor...

Page 40: ... emits a chirping sound every 4 5 seconds For Model 340 Plus and Model 340M Systems the frequency of chirping increases as the batteries become depleted The onset of chirping signals approximately 10 minutes of remaining battery power The chirping continues until the battery power is completely depleted at which time the transmitter stops sending data DANGER POSSIBLE EXPLOSION HAZARD IF USED IN TH...

Page 41: ...or the transmitter Transmitter Board and Transmitter Carrier Board and receiver Receiver Board and Receiver Carrier Board is presented For complementary information refer to the schematics and assembly drawings contained in Chapter 9 of this manual This chapter contains the following technical information Transmitter Board No 2003708 001 4 2 Telemetry Receiver Board Circuitry No 13856A 4 7 Telemet...

Page 42: ...guration creates a burst of 1 151 MHz square waves on the primary winding during each transmit period The secondary winding of the transformer is then coupled to the transducer through a series resonant tank circuit which is used to filter the square waves on the transformer output The transformer while serving as a coupling device is also used to provide an impedance match to the transducer The r...

Page 43: ...proximately 20 dB 80 dB total gain and the composite band pass filter is 100 to 270 Hz A gain adjustment in the filters is used to set the gain for the entire receiver circuit pre amp input to filter output Following the main filters is the frequency doubler This stage is necessary in order to bring the low frequency content of the Doppler shifted signals from the transducer up to a more suitable ...

Page 44: ...ifier a common mode amplifier a VCO and an active low pass filter The differential patient signals from the ECG electrodes are first amplified in the instrumentation stage which is set to a gain of 10 Additionally the common mode voltage present across the gain set resistor on this amplifier is used to create the right leg drive signal This common mode voltage is first buffered in a unity gain sta...

Page 45: ...oltage against a fixed voltage reference Mode information at the receiver is also determined by the presence or absence of the two VCO signals Control of the VCO enables is accomplished through logic in the CPLD based on the transducer in use Level translation for the enable are done by rail to rail op amps configured as comparators There are two states for the low battery condition The first indi...

Page 46: ...egulator is synchronized to a division of the main clock 575 kHz to reduce noise that might interfere with operation of the ultrasound circuit A regulated 6V supply is generated off this supply using a charge pump regulator This converter is also synchronized to a division of the main clock 18 kHz to prevent noise Additional linear regulators operate off the 6 5 V to generate the 6 V and 5 V requi...

Page 47: ...or and monostable When the received signal exceeds the comparator threshold the first comparator fires enabling the monostable The output of the monostable remains enabled as long as the signal level output from the RF receiver exceeds the threshold of the first comparator and for drop outs of less then one half second The output of the monostable in conjunction with TTL inverters and transistor d...

Page 48: ...ctive TTL low state when a tone at a decoder s tuned frequency is present at its input The outputs of the tone decoders along with the lock detect outputs of the PLL circuits used for ECG and TOCO decoding provide the gate signals necessary to control the NOR gate FET switch combination that is used to activate the different modes in the connected fetal monitor The mode enable process for ECG requ...

Page 49: ...to the UA input of the connected fetal monitor The PLL also provides a lock detect output which is used to enable the UA channel on the fetal monitor ECG Channel The ECG channel operates in a similar manner to the TOCO channel described previously The composite signal taken off the output of the 1 5 kHz high pass filter of the TOCO channel is additionally high pass filtered with a three pole activ...

Page 50: ... the feedback circuit to limit the output to 0 6 V The output of the limiter is amplified and connected to a zero crossing detector consisting of an op amp configured as a comparator The output of the zero crossing detector is converted to CMOS levels using a transistor buffer The output of the buffer then drives a CMOS D type flip flop configured as a divide by 2 The Q and NOT Q outputs of the di...

Page 51: ...k headphones antenna and battery pack are all first routed through this board Additionally the transmitter RF module and audio piezo speaker are located on this board The battery and external devices connect from the carrier board to the main board through a 16 pin board transition header A polyswitch current limiter and polarity reversal diode for the battery are used to protect the circuitry on ...

Page 52: ...1 Telemetry Receiver Carrier Board 2004163 001 The Receiver Carrier Board houses the RF receiver module Additional circuitry to add gain to the two receiver outputs audio and RSSI are also located on this board A linear regulator is used to reduce the 12 V from the Receiver Board to the 7 6 V required by the RF module ...

Page 53: ...stems Information Technologies factory It should be considered a performance check and troubleshooting guide to be used in conjunction with other information supplied throughout this service manual It is important to mention this section of the manual is not intended as a substitute for proper professional training or familiarity with the Model 340 Only qualified service personnel should attempt s...

Page 54: ...ystem are GE Medical systems Information Technologies factory service items 03257 17 FCC LICENSE You must have an FCC General Radio Telephone License to service the Model 340 Telemetry System UHF Transmitter Module or UHF Receiver Module Any changes or modifications made to the Model 340 that are not expressly approved by Information Technologies could void the users authority to operate this equi...

Page 55: ...specifications that substantially exceed the tolerance given for each measurement Throughout this chapter the calibration procedures are augmented by icons representing the type of equipment each procedure requires Figure 5 1 summarizes the type of equipment represented by each icon Figure 5 1 Summary of Test Equipment DC AMPS DC Ammeter AC VOLTS AC RMS Voltmeter 888 888 888 Hz Counter Frequency C...

Page 56: ...ews securing the power transformer from the side of the bracket and lay it to the side Unplug the connector from the transformer to the PC board 3 Remove the three heat sink screws from the side of the case 4 Unplug the front panel cables from the PC board Disconnect the ground wire from the front and rear panels 5 Slide the front panel up and off the base place it to the side 6 Remove the six 6 P...

Page 57: ...onnector P6 Do not disconnect the antenna wire Lay the module outside the receiver chassis This will allow access to all the Telemetry Receiver Board test points and adjustments Ultrasound Channel 1 Connect the signal generator between J6 2 and J6 Gnd Adjust the signal generator for a signal level of 1 0Vp p at TP45 2 Confirm the 3 dB points of the band pass frequency are at least 200 Hz and 400Hz...

Page 58: ...between 1750 Hz and 1505 Hz adjust R89 for a voltage differential at TP20 of 4 14 0 1 Vdc 127 The low frequency response of this output stage is approximately 0 1 Hz Allow the stage time to settle between frequency shifts The scale factors for the TOCO stages are 27 2 mV mm and 16 3 mV Hz at TP20 Any input frequency shifts can be used to achieve these scale factors 4 Confirm frequency response at ...

Page 59: ...qual to the dc voltage at TP46 10 mVdc 3 Sweep the input frequency between 2450 Hz and 2950 Hz at a rate of approximately 25 Hz Observe the 25 Hz waveform at TP19 with an 8 1 6 Vp p amplitude 4 Confirm the PLL lock in range This is the frequency where it first achieves lock not the range over which it maintains lock PLL lock occurs at 2300Hz and 3100Hz Confirm lock occurs at 2205 2450 Hz and2950 3...

Page 60: ...s of the switched capacitor bandpass filters for each IC listed in Table 5 2 5 With no signal applied adjust the tone decoders for the correct center frequency indicated in Table 5 3 dB UNITS AC VOLTS DC VOLTS 888 888 888 Hz Generator 888 888 888 Hz Counter Table 5 2 Band Pass Filter Center Frequencies and 3 dB Points IC Reference Center Frequency 3 dB Point U17 6 80 Hz 75 Hz 85 Hz U18 6 40 Hz 35 ...

Page 61: ...ignal is on J4 pin 3 Adjust R1 counter clockwise until TP1 goes low Observe that the signal indicator flashes at approximately 1 second intervals Increase the voltage from the variable voltage source until the signal indicator stops flashing and remains illuminated Confirm the voltage source is at 3 0 0 45 Vdc 127 R1 may need to be readjusted with the UHF receiver module reconnected to J6 2 Remove...

Page 62: ...igh Pulsed Doppler Ultrasound Audio Converter 1 Feed a 1 Vp p 300 ms burst of 300 Hz sine wave into J6 pin 2 with J6 pin 6 as reference observe the waveform and its envelope at TP14 Adjust the signal generator for an amplitude of 1 0 Vp p at TP14 With J201 pin 8 open confirm the waveform at TP43 maintains the same envelope shape but at half the frequency 150 Hz as the signal at TP14 Confirm the pe...

Page 63: ...at TP13 L1 should go through a peak and drop off in amplitude on either side of the peak setting 2 Remove the 300 Hz source adjust R146 for minimum output at TP13 R146 should go through a null setting with the amplitude rising at either side 3 Remove the ground on J201 pin 8 and reconnect the 300 Hz signal source Change the frequency of the signal source on J201 pin 1 to 1 151 MHz and adjust L2 fo...

Page 64: ...to J5 and adjust the supply for a voltage of 4 000 V 10 mV at TP18 Readjust R196 for a frequency of approximately 2 0 kHz Repeat the above procedure until TP19 produces a frequency of 2 000 kHz 5 Hz with TP18 at 4 000 V 10 mV and a frequency of 1 500 kHz 5 Hz with TP18 at 4 000 V 10 mV ECG Channel 1 Connect a digital voltmeter to TP6 Connect the frequency counter to TP20 and preset R193 for a freq...

Page 65: ... Calibration Main Oscillator Connect the frequency counter to TP7 Adjust C135 for a frequency of 4 604 MHz 5 Hz Power Supply 1 Confirm 5 6 V 0 2 V at TP11 2 Confirm 5 8 V 0 2 V at TP10 3 Confirm 5 0 V 0 25 V at TP16 4 Confirm 2 50 V 0 05 V at TP12 5 Confirm 2 50 V 0 05 V at TP14 ...

Page 66: ...5 14 Model 340 Telemetry System Revision A 2006920 001 For your notes ...

Page 67: ... Maintenance 6 All equipment no matter how reliable needs to be maintained on a regular basis This section describes general care and cleaning instructions for the Model 340 Telemetry System General Cleaning Precautions 6 2 Cleaning the Transmitter and Receiver 6 3 ...

Page 68: ... manual for cleaning instructions for the monitor and transducers 87 21 SHOCK Unplug the fetal or maternal fetal monitor and the Model 340R Receiver from the AC power source and detach all accessories Do not immerse accessories in any liquid Do not use abrasive cloth or cleaners on the monitor the Model 340R Receiver the Model 340T Transmitter or any accessories ...

Page 69: ...001 Maintenance Cleaning the Transmitter and Receiver Cleaning the Transmitter and Receiver 1 Wipe any fluids from the surface of each unit 2 Dampen a soft cloth with isopropyl alcohol and gently rub soiled area until clean 3 Dry with a soft dry cloth ...

Page 70: ...6 4 Model 340 Telemetry System Revision A 2006920 001 For your notes ...

Page 71: ... troubleshooting guide for the most basic Model 340 operational problems If the response to a specific question is not found contact the Service Department at one of the following telephone numbers Inside the United States Call 1 800 558 5120 Outside the United States Call 414 355 3790 or contact your local distributor ...

Page 72: ... signal range and designated areas where reception is clear n Install optional ceiling antenna system n Contact your Information Technologies Service Representative Signal and Low Battery indicators light with transmitter turned off n External source of radio frequency interference is present n Another transmitter with the same frequency is in use within the same facility n Service required n Cont...

Page 73: ... areas where reception is clear n Discontinue use of one of the transmitters NOTE Model 340 Plus and Model 340M Telemetry Systems can be factory re programmed to an alternative channel number n Install optional ceiling antenna system n Contact your Information Technologies Service Representative Monitor FHR and UA displays do not light when transducers are plugged into transmitter n Monitor transm...

Page 74: ...7 4 Model 340 Telemetry System Revision A 2006920 001 For your notes ...

Page 75: ...echnical Specifications8 127 Specifications are subject to change without notice This section contains a detailed list of the technical specifications for the Model 340 Telemetry System This chapter lists specifications for the following Transmitter 8 2 Receiver 8 4 ...

Page 76: ...ies with RSS 119 Complies with RSS 210 Monitoring Modes Fetal Heart Rate Uterine Activity Maternal Heart Rate Ultrasound US and Fetal ECG FECG External Tocotransducer TOCO or Internal Intrauterine Pressure Catheter IUPC Maternal ECG MECG Ultrasound Mode System Transmitter Frequency Intensity Isata Pulse Doppler 1 151 MHz 5 mW cm2 ECG Mode Input Impedance dc Tolerance Common Mode Rejection Ratio FE...

Page 77: ...ble BNC interconnect Batteries Type Life Four AA Alkaline Cells 6 0 Vdc at 2450 mAh 20 h approximatelya Control On Off Switch Audio Indicator Low Battery Connectors Remote Event Marker Input Headset Output a Use of the headset will deplete the batteries more rapidly Table 8 1 Transmitter Category Technical Specifications ...

Page 78: ...Listed UL 544 Listed Complies with FCC Part 15 Complies with FCC Part 15 Complies with RSS 119 Complies with RSS 210 Output Signals US ECG UA and Mark RF Section Input Impedance Input Sensitivity 50 Ω 0 4 µV for 12 dB SINAD Antenna Type Flexible detachable BNC interconnect Other factory approved external antennas or antenna systems may be used Contact your Information Technologies Service Represen...

Page 79: ...340 Telemetry System 9 1 2006920 001 Chapter 9 Drawings 9 This section of the manual provies the Model 340 schematics and assembly drawings These drawings should be used in conjunction with other sections in this manual ...

Page 80: ...9 2 Model 340 Telemetry System Revision A 2006920 001 For your notes ...

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Page 82: ...MANUAL P N 2006920 001 REV A Ê2006920 001ÅŠ ...

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