Datex-Ohmeda S-5 Service Manual M-NMT

Datex-Ohmeda

S/5TM NeuroMuscular Transmission Module, M-NMT (Rev. 02)

Technical Reference Manual Slot

Datex-Ohmeda Inc.
3030 Ohmeda Drive
53707-7550 MADISON, WIS

USA
Tel. [phone], Fax [phone]

www.us.datex-ohmeda.com

All specifications are subject to change without notice.

Document No. 800 1018-1

June 2001

Datex-Ohmeda Division,

Instrumentarium Corp.

P.O. Box 900, FIN-00031

DATEX-OHMEDA, FINLAND

Tel. [phone] Fax [phone]

www.datex-ohmeda.com

 Instrumentarium Corp. All rights reserved.

Table of contents

TABLE OF CONTENTS

NeuroMuscular Transmission Module, M-NMT

TABLE OF CONTENTS i

TABLE OF FIGURES ii

Introduction 1

1 Specifications 2

1.1 General specifications ..............................................................................................................................2

1.2 Technical specifications............................................................................................................................2

1.2.1 NMT.................................................................................................................................................2

1.2.2 Stimulator........................................................................................................................................2

1.2.3 Regional block mode........................................................................................................................2

2 Functional description 3

2.1 Measurement principle .............................................................................................................................3

2.1.1 Nerve stimulation.............................................................................................................................3

2.1.2 Response.........................................................................................................................................4

2.1.3 Regional block .................................................................................................................................4

2.2 Main components.....................................................................................................................................4

2.2.1 NMT board.......................................................................................................................................4

2.3 Connectors and signals.............................................................................................................................6

2.3.1 Module bus connector......................................................................................................................6

2.3.2 Front panel connector.......................................................................................................................7

3 Service procedures 8

3.1 General service information.......................................................................................................................8

3.2 Service check ...........................................................................................................................................9

3.2.1 Recommended tools ........................................................................................................................9

3.3 Disassembly and reassembly..................................................................................................................13

4 Troubleshooting 14

4.1 Troubleshooting chart .............................................................................................................................14

4.2 Troubleshooting flowchart .......................................................................................................................15

5Service Menu 16

5.1 NMT menu..............................................................................................................................................17

6 Spare parts 19

6.1 Spare part list.........................................................................................................................................19

6.1.1 NMT Module, M-NMT rev. 00...........................................................................................................19

6.1.2 NMT Module, M-NMT rev. 01...........................................................................................................19

6.1.3 NMT Module, M-NMT rev. 02...........................................................................................................19

6.1.4 Front panel stickers for AS/3 modules (square buttons) ...................................................................20

6.1.5 Front panel stickers for S/5 modules (round buttons).......................................................................20

7 Earlier revisions 21

APPENDIX A 23

Document No. 800 1018-1

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Datex-Ohmeda S/5 monitors

Service check form A-1

TABLE OF FIGURES

Figure 1 NeuroMuscular Transmission Module, M-NMT ....................................................................................... 1

Figure 2 Principle of response measurement ......................................................................................................4

Figure 3 Serial communication and opto isolation...............................................................................................5

Figure 4 Stimulator block diagram......................................................................................................................5

Figure 5 Module troubleshooting flowchart .......................................................................................................15

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Document No. 800 1018-1

INTRODUCTION

This section provides information for the maintenance and service of the NeuroMuscular
Transmission Module, M-NMT. The M-NMT module is a single width plug-in module designed for
use with the S/5 Anesthesia and Compact Anesthesia Monitors. The module contains peripheral
nerve stimulation and response measurement which supports electromyography EMG. The module
can also be used as a nerve locator for regional nerve blocking with a regional block cable.
However, in this case there is no response measurement.

NeuroMuscular Transmission Module, M-NMT

Figure 1 NeuroMuscular Transmission Module, M-NMT

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in
Module weight 0.37 kg /0.8 lbs
Power consumption 3.3 W

1.2 Technical specifications

1.2.1 NMT

Stimulation modes Train of four (TOF)

Measurement intervals for TOF and DBS

Measurement intervals for ST Manual; 1 s, 10 s, 20 s

Double burst (3.3) (DBS)
Single twitch (ST)
50 Hz tetanus + post tetanic count (PTC)

Manual; 10 s, 12 s, 15 s, 20 s, 1 min, 5 min, 15 min

1.2.2 Stimulator

Stimulus pulse Square wave, constant current
Pulse width 100, 200 or 300 µs
Stimulus current range 10...70 mA with 5 mA steps
Stimulus current accuracy 10 % or ±3 mA whichever is the greater
Max. load 3 kΩ
Max. voltage 300 V

1.2.3 Regional block mode

Stimulation modes Single twitch
Intervals 1 s, 2 s, 3 s
Stimulus pulse Square wave, constant current
Pulse width 40 µs
Stimulus current range 0...5.0 mA with 0.1 mA steps
Stimulus current accuracy 20 % or 0.3 mA whichever is the greater

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 Nerve stimulation

There are three stimulus modes in the NeuroMuscular Transmission Module: Train of Four (TOF),
Double Burst 3,3 (DBS) and Single Twitch (ST).

In the Train of Four stimulus mode, four stimulation pulses are generated at 0.5 second intervals.
The response is measured after each stimulus and the ratio of the fourth and first response of the
TOF sequence is calculated (TOF%).

NOTE: If the first response does not exceed a certain signal level, TOF% is not calculated due to
poor accuracy.

Double burst (3,3) stimulation includes two bursts with a 750 ms interval. Both bursts consist of
three pulses separated by 20 ms intervals. The responses of both bursts are measured, and the
ratio of the second and first response is calculated (DBS%). EMG responses are measured
immediately after the first stimulus pulse of both bursts.

NeuroMuscular Transmission Module, M-NMT

Tetanic/PTC

In Single Twitch stimulation, one stimulation pulse is generated. The response is measured after
the stimulus. In order to prevent decurarization of the stimulated area, the measurement is
automatically stopped after 5 minutes stimulation in 1 sec cycle time.

Tetanic/PTC (Post Tetanic Count) can measure deeper relaxation than TOF. The tetanic stimulation
is produced when Start is chosen under Tetanic/PTC. The length of stimulation is 5 seconds. The
stimulation generates pulses with a frequency of 50 Hz and with a selected pulse width and
current. After tetanic stimulation and a three second delay, Single Twitch stimulation is produced
to detect the post tetanic count (PTC). PTC describes the number of responses detected after
tetanic stimulation. If there is no response, the measurement will be stopped. If responses will not
fade away, a maximum of 20 responses will be calculated. If more can be detected, the PTC value
is displayed only as '> 20' and measurement will be stopped. If the TOF, DBS or ST measurement
cycle was on when tetanic stimulation started, the cycle will continue after the PTC. After
completing the PTC measurement during 1 minute TOF, DBS or another PTC measurement is not
possible. This is to avoid erroneous readings due to post tetanic potentiation.

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A

µ

2.1.2 Response

Before each stimulation, the sequence offset, noise and threshold for the response detection is
measured. Offset is a baseline of the noise measurement. Noise is calculated by the same
algorithm as the response signal itself. The response detection threshold is calculated based on
the noise, and if the response is not greater than the threshold then it is interpreted as no response.

EMG

Mechano

Sensor

Measurement

/D & P

Timing control

EMG leads off

Figure 2 Principle of response measurement

EMG measurement

The EMG response is measured as integrated muscle activity. The EMG measurement starts 3 ms
after the stimulation and lasts 15 ms. The 3 ms delay helps to prevent the effect of stimulation
artifact.

Mechano sensor measurement

Response is measured as movement of the thumb, which is the area of positive signal.

2.1.3 Regional block

A regional block cable can be used as a nerve locator in local anesthesia. A maximum current of

5.0 mA is given every, every other or every 3rd second. The response measurement is ocular.

2.2 Main components

2.2.1 NMT board

The NMT Circuit Board consists of the following functional sections:

• constant current stimulator

• measuring electronics for the EMG signals

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• microprocessor for the stimulation and measuring control, and for counting the measuring

• serial communication

The serial bus speed is 500 kbps and the bus itself is half duplex, i.e. data can be transferred in
both directions but only one way at a time.

Serial communication

NeuroMuscular Transmission Module, M-NMT

results

Stimulator

Figure 3 Serial communication and opto isolation

The constant current stimulator generates pulses whose amplitude is independent of the load. The
main components of the stimulator are a transformer, a capacitor and a transistor. The transformer
produces a high voltage which charges the capacitor and the transistor adjusts the pulse width and
amplitude of the current.

Power supply

Current

80C196KD

PWM

HSO

Patient

Constant current
generator

adjustment

Current
control

Continuous
stimulation
congestion

Figure 4 Stimulator block diagram

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2.3 Connectors and signals

2.3.1 Module bus connector

13

25

1

14

Table 1 Module bus connector (X1)

Pin No. I/O Signal

1 I RESET_RS485

2 I -15 VDC

3 I +15 VDIRTY

4 I +15 VDC

5 I/O -DATA_RS485

6 I/O DATA_RS485

7 - Ground & Shield

8 I -RESET_RS485

9 I CTSB

10 O RTSB

11 I RXDB

12 O TXDB

13 - Ground & Shield

14 I +32 VDIRTY

15 I GroundDIRTY

16 I CTSC

17 O RTSC

18 I RXDC

19 O TXDC

20 - ON/STANDBY

21 - PWM_ECG

22 - RXDD_RS232

23 - TXDD_RS232

24 I +5 VDC

25 I +5 VDC

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2.3.2 Front panel connector

NMT connector (NMT)

6

3

9

1

4

7

2

0

5

8

Pin No. Signal

1

2

3

4

5

6

7

8

9

10

EMG Signal +

EMG Signal -

Not Used

Stimulus +

Stimulus -

Ground

Not Connected

Sensor Identification

+5 V

Mechanical Signal

NeuroMuscular Transmission Module, M-NMT

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the NeuroMuscular Transmission Module, M-NMT, is limited to replacing faulty
circuit boards or mechanical parts. Faulty circuit boards should be returned to Datex-Ohmeda for
repair.

Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

The Datex-Ohmeda NMT Stimulator (order code 871251) is recommended for functional checks.

CAUTION Only trained personnel with appropriate equipment should perform the tests and repairs outlined in

this section. Unauthorized service may void warranty of the unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service check is
recommended to be performed after any service repair. However, the service check procedures can
also be used for determining possible failures.

The procedures should be performed in ascending order.

The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

NeuroMuscular Transmission Module, M-NMT

The mark

the procedure.

The procedures are designed for monitors with S/5 monitor software of revision 01. However, most
of the procedures also apply to monitors, which contain some other monitor software
type/revision.

? in the instructions means that the check form should be signed after performing

3.2.1 Recommended tools

Tool Order No. Notes

NMT simulator 871251

M-NMT ElectroSensor

M-NMT MechanoSensor

M-NMT Sensor Cable

3 kΩ resistor

Screwdriver

• Detach the module box by removing the two screws from the back of the module. Be careful

with the loose latch and spring locking pin.

1. Check internal parts:

− screws are tightened properly

− cables are connected properly

− the EMC cover is attached properly

− there are no loose objects inside the module

?

2. Check external parts:

− the front cover and the front panel sticker are intact

− connectors are intact and are attached properly

− the module box, latch and spring locking pin are intact

?

• Refit the module box and check that the latch moves properly.

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• Turn the monitor on and wait until the normal monitoring screen appears.

• Configure the monitor screen so that information regarding the NMT measurement is shown,

for example:

Monitor Setup - Screen 1 Setup - Digit Fields - Field 4 - Nmt

• Preset the NMT measurement settings:

Others - NMT - Stimulus Mode - TOF

3. Plug in the module. Check that it goes in smoothly and locks up properly

Set Cycle Time - 10 sec
NMT Setup - Current - S(70 mA)

Pulse Width - 200
Stim. Beep Volume - 2

µµµµ

S

?

4. Check that the module is recognized, i.e. the NMT header with related information appear in

the chosen digit field.

?

5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding NMT software by selecting SCROLL VERS and turning
the ComWheel.

?

6. Enter the NMT module service menu:

Parameters - NMT

Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not increasing
faster than by 50 per second. Check that the module’s memories have passed the internal
memory test, i.e. “RAM”, “ROM” and “EEPROM” all state OK.

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?

7. Check the front panel START-UP and STOP/CONTINUE membrane keys.

Press each key for at least one second and check that the key being pressed is identified,
i.e. the color under the corresponding text on the menu turns blue.

?

NeuroMuscular Transmission Module, M-NMT

8. Check that the message “Cable off” is shown in the digit field and that “Cable” in the service

menu states OFF.

Plug the M-NMT Sensor Cable with the M-NMT ElectroSensor into front panel connector
NMT. Check that the message in the digit field changes to “Measurement OFF” and “Cable”
on the service menu states EMG and ELECTR. OFF.

?

9. Perform the stimulus current test.

Connect a 3 kΩ resistor between the ElectroSensor’s stimulus electrode leads (brown and
white).

Start the test by highlighting START CURR. TEST on the service menu and pressing the
ComWheel. Check that the test was successful with all three test currents, i.e. the “Current
test (mA):” on the menu states 30 OK, 50 OK and 70 OK.

?

• Connect the M-NMT ElectroSensor leads to the NMT simulator. Set the switch on the

simulator to “Fade off” and turn the knob to “max”. Check “Cable” on the service menu now
states only EMG.

10. Start NMT measurement (TOF) by pressing the START-UP key on the module.

When the message “Supramax search” changes to “Setting reference” in the digit field,
check that the supramaximal current detected is less than 70 mA, i.e. the “Current set”
value on the service menu is less than 700.

?

11. Check that the module gives four successive stimulus pulses with 10 second intervals. A

small asterisk (✼) should be shown in the digit field during each of the stimulus pulses and
simultaneous sound signals should be heard from the loudspeaker.

Check that on the service menu the values for “T1%”, “T2%”, “T3%”, “T4%” and “Ratio%”
are all within 950-1059.

Check also that in the digit field the “TOF%” value is within 95-105, “Count” is 4 and “T1%”
is within 95-105.

?

12. Check that the “Noise” value on the service menu stays under 50.

?

13. Change the stimulus pulse width to 100 µs through the NMT service menu:

NMT Setup - Pulse Width - 100

µµµµ

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Check that the “TOF%” value is still within 95-105, “Count” is 4 and “T1%” is within 95-105
in the digit field.

Check the same parameters with a stimulus pulse width of 300 µs.

?

14. Turn the knob on the NMT simulator to “0”.

Check that on the service menu the values for “T1%”, “T2%”, “T3%”, “T4%” turn to 0 and the
“Ratio%” states - - -. In the digit field “TOF%” should also state - - - , and “Count” and “T1%”
should show 0.

Turn the NMT simulator knob back to “max”.

?

15. Change the stimulus mode to Double Burst Stimulation (DBS) through the service menu:

NMT Setup - Stimulus Mode - DBS

Check that the module now gives only two stimulus pulses with a 10 seconds interval.

Check that on the service menu the values for “T1%”, “T2%”, and “Ratio%” are still within
950-1059. In the digit field the “DBS%” value should be within 95-105, “Count” is 2 and
“T1%” is within 95-105.

?

16. Change the stimulus mode to Single Twitch Stimulation (ST):

NMT Setup - Stimulus Mode - ST

Check that the module starts to give only one stimulus pulse with a 1 second interval. Note
the time when the ST stimulation started.

Check that on the service menu the value for “T1%” is within 950-1059. In the digit field the
“Count” value should be 1 and “T1%” within 95-105.
Let the monitor continue to give single twitch stimulation.

?

17. Check that the NMT measurement stops and the message “Measurement OFF” appears in

the digit field for NMT five minutes after the start of the ST stimulation.

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Document No. 800 1018-1

?

18. Replace the M-NMT ElectroSensor with the M-NMT MechanoSensor and check that “Cable”

on the service menu states PIEZO.

?

19. Perform an electrical safety check and a leakage current test.

?

20. Check that the module functions normally after performing the electrical safety check.

?

21. Clean the module with suitable detergent.

?

• Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the NeuroMuscular Transmission Module, M-NMT, in the following way. See the
exploded view of the module.

1. Remove the two screws from the back of the module.

NeuroMuscular Transmission Module, M-NMT

2. Pull the module box slowly rearward and detach it from main body. Be careful with the loose

latch and spring locking pin.

3. Detach the NMT board by removing the two screws located near the front panel frame,

disconnect the cables and pull out the front panel frame.

To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that the cables are reconnected

properly.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Cause Treatment

Check the stimulus electrodes.

EMG electrode off.

Supramax. not found. Loose electrodes or loose stimulus

Response too weak. Loose stimulus electrodes.

Ref. not stable. Patient is relaxated.

Loose electrodes or loose stimulus
clip.

clip.

Stimulus electrodes attached to
wrong place.

Patient is relaxated.

Measuring electrodes attached to
wrong place.

Patient is relaxated.

Movement artifact.

Change or attach the electrodes or
clip.

Change or attach the electrodes or
clip.

Change the place of the stimulus
electrode.

Change or attach the electrodes.

Change the place of the meas.
electrodes.

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4.2 Troubleshooting flowchart

Possible fault in NMT module

Open NMT Service Menu

Check Timeouts, Bad checksums,

Bad c-s by mod

no

OK?

yes

Check RAM,ROM,EEPROM

OK?

yes

Test stimulus current

OK?

yes

Check that sensor is identified

OK?

yes

Connect ElectroSensor to NMT

stimulator and start measurement

no

no

Does another module

work in the same slot?

Fault not in NMT module

Replace NMT board

Does the test pass with

another sensor?

yes

Replace the original sensor Connect the connector

Does the test pass with

another sensor?

no

Does the test pass with

another NMT sensor

no

Does the test pass with

another NMT input

no

Replace NMT board

no

cable?

board?

no

Does the test pass with

another NMT sensor

yes

Replace the original

NMT sensor cable

cable?

NeuroMuscular Transmission Module, M-NMT

yes

no yesno

Are the NMT input board

wires connected?

no yes

yes

yes

yes

Replace NMT board

Does the test pass

with another NMT

input board?

Replace the original

NMT input board

Replace the original sensor

Replace the original NMT sensor

cable

Replace the original NMT input

board

no

Replace NMT board

Responses OK?

yes

Check front panel key functions

OK?

no

no

Does the test pass with

another sensor?

no

Does the test pass with

another NMT sensor

cable

no

Does the test pass with

another NMT input

board?

no

Replace NMT board

Is the keypad

connected?

yes

Does the test pass with

another keypad?

no

Replace NMT board

Figure 5 Module troubleshooting flowchart

yes

yes

yes

no

yes

Replace the original sensor

Replace the original NMT sensor

cable

Replace the original NMT input

board

Connect the keypad

Replace the original keypad

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5 SERVICE MENU

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).

3. Select Service (password 26-23-8).

4. Select Parameters.

5. Select NMT.

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Document No. 800 1018-1

5.1 NMT menu

NeuroMuscular Transmission Module, M-NMT

Start Curr. test Start Curr. test is a test where the module itself checks the difference between a given current and

the measured current. A 3 k
before starting the test. All the currents checked will be displayed on the service data screen. After
the current value, the status of the test is shown. If the test is not passed, send the module back to
the factory for calibration.

T1%/ref T1% / ref gives a selection for changing settings related to the M-NMT MechanoSensor. A setting

of 3 should always be used for normal monitoring. The settings 1 and 2 are for research purposes
only.

Record Data Record Data prints out the displayed service data and circuit board information (id., serial number,

and software id.) onto the Recorder Module, M-REC.

Ω resistance should be connected between the stimulus electrodes

Service Data Cable shows the type of cable being used.

Cable check value shows the bit amount. From the following chart you can check the value for

each cable:

EMG -100...+100

Cable OFF >1950

Piezo 900...1100

Regional block 600....800

Module Keys checks the function of the module keys. A blue background appears at the back of
the text when a key is pressed for more than one second.

Stimulus mode shows the selected stimulus. Stimulus mode can be changed using the NMT Setup
menu.

Measurement indicates ON/OFF.

T1%, T2% shows the measured response. A value of 1000 corresponds to 100%.

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Absolute T1, T2 shows the voltage measured from the A/D converter.

Noise indicates the interference just before the measurement. A typical value is <10.

Offset is an average of the noise measurement. A typical value is 510.

Curr set is the selected current, a value of 700 corresponds to 70 mA.

Curr meas is the measured current, a value of 700 corresponds to 70 mA.

Pulses indicates pulses the module has produced.

Piezo probe T1% and ref. search shows information related to the MechanoSensor settings.

Timeouts is a cumulative number that indicates how many times the module has not responded to

the monitor's inquiry.

Bad checksums is a cumulative number that indicates how many times communication from the
module to the monitor has failed.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The non-zero
values do not indicate a failure, but the continuous counting (more than 50 per second) indicates
either serial communication failure, or module not in place. Also, other modules can cause
communication errors that cause these numbers to rise.

RAM indicates the state of the RAM memory.
ROM indicates whether the checksum in the EPROM is in accordance with the software calculated

value.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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Document No. 800 1018-1

6 SPARE PARTS

6.1 Spare part list

NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories.

6.1.1 NMT Module, M-NMT rev. 00

NeuroMuscular Transmission Module, M-NMT

6

4

1

3

2

5

7

8

10

9

11

Item Description Order No. Item Description Order No.

1 Module box (single width) 886167 8 NMT board, M-NMT (Rev. 00-01) *887487

2 Latch 879181 9 EMC cover, M-NMT 886320

3 Spring pin 879182 10 Cross cylinder-head screw M3x12 628700

4 Cross recess screw M3x8 black 616215 11 NMT input board 887184

5 Front panel unit, M-NMT 887186 12 Membrane keypad 880101

6 Cross cylinder-head screw M3x6 61721 13 Front panel sticker, see 6.1.3 -

7 Metal frame 879184 - - -

12

13

The front panel unit includes the connector and input board.
* this part is recommended for stock

6.1.2 NMT Module, M-NMT rev. 01

No new spare parts.

6.1.3 NMT Module, M-NMT rev. 02

No new spare parts.

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6.1.4 Front panel stickers for AS/3 modules (square buttons)

Front panel stickers that are related to the Compact Module type and adaptation:

Adaptation codes: DA=Danish, DE=German, EN=English, ES=Spanish, FI=Finnish,
FR=French, IT=Italian, JA=Japanese, NL=Dutch, NO=Norwegian, PT=Portuguese,
SV=Swedish

Item 13.

M-NMT (rev. 00-01)

Adaptation

DA 892217

DE 886003

EN 886002

ES 887498

FI 888873

FR 886004

IT 887542

JA 888318

NL 887370

NO 893572

PT 895240

SV 887369

Order No.

6.1.5 Front panel stickers for S/5 modules (round buttons)

Front panel stickers that are related to the Compact Module type and adaptation:

Adaptation codes: DA=Danish, DE=German, EN=English, ES=Spanish, FI=Finnish,
FR=French, IT=Italian, JA=Japanese, NL=Dutch, NO=Norwegian, PT=Portuguese,
SV=Swedish

M-NMT (rev. 02)

Adaptation

DA 898846

DE 898837

EN 898836

ES 898840

FI 898843

FR 898838

IT 898841

JA 8000383

NL 898839

NO 898845

PT 898842

SV 898844

Order No.

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Document No. 800 1018-1

7 EARLIER REVISIONS

This manual also supports earlier module revision 00.

NeuroMuscular Transmission Module, M-NMT

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Document No. 800 1018-1

APPENDIX A, Service Check Form, M-NMT

APPENDIX A

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Document No. 800 1018-1

APPENDIX A, Service Check Form, M-NMT

SERVICE CHECK FORM

NeuroMuscular Transmission Module, M-NMT

Customer

Service

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Installation 4. Recognition

5. Module software

6. Communication and

memories

8. ElectroSensor

recognition

10. Supramaximal current < 70 mA

NMT

Module type S/N

7. Membrane keys

9. Stimulus current test

11. TOF measurement with NMT simulator

T1%

T2% 950-1059

T3% 950-1059

T4% 950-1059

Ratio% 950-1059

TOF% 95-105

Count 4

T1% 95-105

12. Noise < 50

950-1059

Document No. 800 1018-1

A-1(2)

Datex-Ohmeda S/5 monitors

13. Stimulus pulse width

100 µs 300 µs Allowed range

TOF% 95-105

Count 4

T1% 95-105

OK N.A. Fail

14. No response

15. DBS measurement with NMT simulator

T1%

T2% 950-1059

Ratio% 950-1059

DBS% 95-105

Count 2

T1% 95-105

16. ST measurement with NMT simulator

T1%

Count 1

T1% 95-105

17. Automatic measurement off 18. MechanoSensor

recognition

19. Electrical safety check 20. Functioning after

electrical safety
check

21. Final cleaning

950-1059

950-1059

Notes

Used Spare Parts

Signature

A-2(2)

Document No. 800 1018-1