NPI TMR-02M Operating instructions

OPERATING INSTRUCTIONS AND
SYSTEM DESCRIPTION FOR THE
TMR-02M
TIMER MODULE
FOR EPMS SYSTEMS
VERSION 1.5
npi 2015
npi electronic GmbH, Bauhofring 16, D-71732 Tamm, Germany
Phone [phone]; Fax: [phone]
[email protected]; http://www.npielectronic.com

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Table of Contents
1. Safety Regulations............................................................................................................ 3
2. EPMS-07 Modular Plug-In System.................................................................................. 4
2.1. General System Description / Operation ..................................................................... 4
2.2. EPMS-07 Housing....................................................................................................... 4
2.3. EPMS-H-07 Housing................................................................................................... 4
2.4. EPMS-E-07 Housing ................................................................................................... 4
2.5. EPMS-03 ..................................................................................................................... 5
2.6. PWR-03D .................................................................................................................... 5
2.7. System Grounding ....................................................................................................... 6
EPMS-07/EPMS-03 .................................................................................................... 6
EPMS-E-07.................................................................................................................. 6
2.8. Technical Data............................................................................................................. 6
EPMS-07, EPMS-E-07 and EPMS-H-07 .................................................................... 6
EPMS-07 and EPMS-H-07.......................................................................................... 6
EPMS-E-07.................................................................................................................. 6
EPMS-03 ..................................................................................................................... 6
3. TMR-02M Timer Module ................................................................................................ 7
3.1. TMR-02M Components .............................................................................................. 7
3.2. System Description...................................................................................................... 7
3.3. Description of the Front Panel..................................................................................... 7
4. Operation .......................................................................................................................... 10
5. Technical Data.................................................................................................................. 11

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1. Safety Regulations
VERY IMPORTANT:Instruments and components supplied by npi electronic are NOT
intended for clinical use or medical purposes (e.g. for diagnosis or treatment of humans),
or for any other life-supporting system. npi electronic disclaims any warranties for such
purpose. Equipment supplied by npi electronic must be operated only by selected, trained
and adequately instructed personnel. For details please consult the GENERAL TERMS
OF DELIVERY AND CONDITIONS OF BUSINESS of npi electronic, D-71732 Tamm,
Germany.
1) GENERAL: This system is designed for use in scientific laboratories and must be operated
by trained staff only. General safety regulations for operating electrical devices should be
followed.
2) AC MAINS CONNECTION: While working with the npi systems, always adhere to the
appropriate safety measures for handling electronic devices. Before using any device
please read manuals and instructions carefully.
The device is to be operated only at 115/230 Volt 60/50 Hz AC. Please check for
appropriate line voltage before connecting any system to mains.
Always use a three-wire line cord and a mains power-plug with a protection contact
connected to ground (protective earth).
Before opening the cabinet, unplug the instrument.
Unplug the instrument when replacing the fuse or changing line voltage. Replace fuse only
with an appropriate specified type.
3) STATIC ELECTRICITY: Electronic equipment is sensitive to static discharges. Some
devices such as sensor inputs are equipped with very sensitive FET amplifiers, which can
be damaged by electrostatic charge and must therefore be handled with care. Electrostatic
discharge can be avoided by touching a grounded metal surface when changing or
adjusting sensors. Always turn power off when adding or removing modules,
connecting or disconnecting sensors, headstages or other components from the
instrument or 19” cabinet.
4) TEMPERATURE DRIFT / WARM-UP TIME: All analog electronic systems are sensitive
to temperature changes. Therefore, all electronic instruments containing analog circuits
should be used only in a warmed-up condition (i.e. after internal temperature has reached
steady-state values). In most cases a warm-up period of 20-30 minutes is sufficient.
5) HANDLING: Please protect the device from moisture, heat, radiation and corrosive
chemicals.

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2. EPMS-07 Modular Plug-In System
2.1. General System Description / Operation
The npi EPMS-07 is a modular system for processing of bioelectrical signals in
electrophysiology. The system is housed in a 19” rackmount cabinet (3U) has room for up to 7
plug-in units. The plug-in units are connected to power by a bus at the rear panel.
The plug-in units must be kept in position by four screws (M 2,5 x 10). The screws are important
not only for mechanical stability but also for proper electrical connection to the system housing.
Free area must be protected with covers.
2.2. EPMS-07 Housing
The following items are shipped with the EPMS-07 housing:
✓EPMS-07 cabinet with built-in power supply
✓Mains cord
✓Fuse 2 A / 1 A, slow (inserted)
✓Front covers
Figure 1: Left: front view of empty EPMS-07 housing.
In order to avoid induction of electromagnetic noise the power supply unit, the power switch
and the fuse are located at the rear of the housing (see Figure 2, right).
2.3. EPMS-H-07 Housing
In addition to the standard power supply of the EPMS-07, the EPMS-H-07 has a built-in high
voltage power supply. This is necessary for all MVCS / MVCC modules, the HVA-100, HV-
TR150 and HVC-03M modules. The output voltage depends on the modules in use.
2.4. EPMS-E-07 Housing
The following items are shipped with the EPMS-E-07 housing:
✓EPMS-E-07 cabinet
✓External Power supply PWR-03D
✓Power cord (PWR-03D to EPMS-E-07)
✓Mains chord
✓Fuse 1.6 A / 0.8 A, slow (inserted)
✓Front covers
The EPMS-E-07 housing is designed for low-noise operation, especially for extracellular and
multi channel amplifiers with plugged in filters. It operates with an external power supply to
minimize distortions of the signals caused by the power supply.

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2.5. EPMS-03
The following items are shipped with the EPMS-07 housing:
✓EPMS-07 cabinet with built-in power supply
✓Mains cord
✓Fuse 034 A / 0,2 A, slow (inserted)
✓Front covers
Figure 2: Left: front view of EPMS-03 housing. Right: rear panel detail of EPMS-03 and
EPMS-07 housing.
In order to avoid induction of electromagnetic noise the power supply unit, the power switch
and the fuse are located at the rear of the housing (see Figure 2, right).
2.6. PWR-03D
The external power supply PWR-03D is capable of driving up to 3 EPMS-E housings. Each
housing is connected by a 6-pole cable from one of three connectors on the front panel of the
PWR-03D to the rear panel of the respective EPMS-E housing. (see Figure 3, Figure 4). A
POWER LED indicates that the PWR-03D is powered on (see Figure 3, left). Power switch,
voltage selector and fuse are located at the rear panel (see Figure 3, right).
Note: The chassis of the PWR-03D is connected to protective earth, and it provides protective
earth to the EPMS-E housing if connected.
Figure 3: Left: PWR-03D front panel view Right: PWR-03D rear panel view.
Note: This power supply is intended to be used with npi EPMS-E systems only.

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2.7. System Grounding
EPMS-07/EPMS-03
The 19" cabinet is grounded by the power cable through the ground pin of the mains connector
(= protective earth). In order to avoid ground loops the internal ground is isolated from the
protective earth. The internal ground is used on the BNC connectors or GROUND plugs of the
modules that are inserted into the EPMS-07 housing. The internal ground and mains ground (=
protective earth) can be connected by a wire using the ground plugs on the rear panel of the
instrument. It is not possible to predict whether measurements will be less or more noisy with
the internal ground and mains ground connected. We recommend that you try both
arrangements to determine the best configuration.
EPMS-E-07
The 19" cabinet is connected to the CHASSIS connector at the rear panel. It
can be connected to the SYSTEM GROUND (SIGNAL GROUND) on the rear
panel of the instrument (see Figure 4).
The chassis can be linked to PROTECTIVE EARTH by connecting it to the
PWR-03D with the supplied 6-pole cable and by interconnecting the
GROUND and PROTECTIVE EARTH connectors on the rear panel of the
PWR-03D (see Figure 3). Best performance is generally achieved without
connection of the chassis to protective earth.
Important: Always adhere to the appropriate safety measures.
Figure 4: Rear panel connectors of the EPMS-E-07
2.8. Technical Data
EPMS-07, EPMS-E-07 and EPMS-H-07
19” rackmount cabinet, for up to 7 plug-in units
Dimensions: 3U high (1U=1 3/4” = 44.45 mm), 254 mm deep
EPMS-07 and EPMS-H-07
Power supply: 115/230 V AC, 60/50 Hz, fuse 2 A / 1 A slow, 45-60 W
EPMS-E-07
External power supply (PWR-03D) 115/230 V AC, 60/50 Hz, fuse 1.6/0.8 A, slow
Dimensions of external power supply: (W x D x H) 225 mm x 210 mm x 85 mm
EPMS-03
Power supply: 115/230 Volts AC, 60/50 Hz, fuse 0.4 A / 0.2 A slow
Maximum current supply: 500 mA
Dimensions: 3U high (1U=1 3/4” = 44.45 mm), 254 mm deep, 265 mm wide

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3. TMR-02M Timer Module
3.1. TMR-02M Components
The following items are shipped with the TMR-02M system:
✓Timer module for the EPMS-07 system
✓User manual
3.2. System Description
The TMR-02M was designed as an easy-to-use device for generating square pulses of fixed
amplitude (TTL, +5 V) and variable length.
The TMR-02M has two digital switches to set PULSE duration and DELAY time. The TMR-
02M can be used continuously or for a selectable number of cycles. A switch allows manual
start (and stop while cycling), but the unit can also be operated using an external TRIGGER.
The TRIGGER output is used to control external devices, e.g. an oscilloscope.
3.3. Description of the Front Panel
Figure 5: TMR-02M front panel view

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(1) PULSE (x 0.01 ms) switch
5-digit thumb wheel switch to set the duration of the PULSE, minimum pulse width 10 µs,
maximum pulse width 999.99 ms.
(2) DELAY (x 0.01 ms) switch
5-digit thumb wheel switch to set a delay time, minimum delay time 10 µs, maximum delay
time 999.99 ms.. The delay time is the time from the rising edge of the trigger TTL signal to
the beginning of the rising edge of the PULSE (see also Figure 6).
Note: If both thumb wheel switches are set to 00000, a short pulse with 1 µs duration will be
generated!
(3) CYCLES switch
Switch for setting the number of desired cycles (1 to 999).
Note: At the start of each train of cycles a RESET is executed, i.e. the TMR will be reset
immediately after a start signal comes, either via manual switch or via TTL signal. For instance,
if you preset 10 cycles and you press start or a TTL pulse is applied, the timer is reset to zero,
10 cycles will be executed and the TMR stops still showing "10" at the display. Upon the next
start signal (via switch or TTL) the timer is reset again and 10 cycles will be executed.
Note: If the thumb wheel switch is set to 000 and switch #4is set to REPETITIVE, 1 cycle will
be generated!
(4) REPETITIVE / CONTINUOUS switch
Switch for setting the operation mode of the TMR-02M.
REPETITIVE: The timer cycles repetitively pulses: The number cycles is of set by CYCLES
switch #3.
CONTINUOUS: The timer cycles pulses continuously as long as the RESET / STOP switch is
pressed.
(5) TIMER OUT (TTL) connector
BNC connector providing the timed TTL signal (see also #1and #2, Figure 5). The TTL at this
connector is HI (+5 V) for the duration of the pulse.
(6) TRIGGER OUT (TTL) connector
BNC connector providing a TRIGGER signal for triggering an external device, e.g. an
oscilloscope at the beginning of each cycle. The signal amplitude (TTL, +5 V), the signal length
is 1 µs.
(7) TRIGGER IN (TTL) connector
BNC connector for connecting an external TRIGGER device, minimum length: 10 µs.

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(8) RESET / STOP switch
Switch for stopping the timer.
RESET: the timer is stopped and the CYCLE COUNTER is set to zero.
STOP: the timer is stopped and the CYCLE COUNTER shows the number of cycles which had
been carried out. If started again with switch #9 the CYCLE COUNTER continues to count.
Note: At the start of each train of cycles a RESET is executed, i.e. the TMR will be reset
immediately after a start signal comes, either via manual switch or via TTL signal. For instance,
if you preset 10 cycles and you press start or a TTL pulse is applied, the timer is reset to zero,
10 cycles will be executed and the TMR stops still showing "10" at the display. Upon the next
start signal (via switch or TTL) the timer is reset again and 10 cycles will be executed.
(9) START / TRIG IN BNC switch
Switch for setting the kind of starting.
START: The timer is started by pressing the switch to this position.
TRIG IN BNC: The timer is started by a TTL HI signal applied to the TRIG IN BNC.
Note: To prevent unwanted cycle starts the START function of the switch has a built-in de-
bouncing circuit. As a result the minimum time between two manually switched START events
is ca. 2 s.
(10) CYCLE COUNTER LED
LED indicating the number of cycles which had been carried out since the first start. In
CONTINUOUS mode the LED counts continuously.

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4. Operation
The TMR-02M module can be started either manually by pushing START (#9, Figure 5)or by
a TTL HI signal (rising edge) at TRIGGER IN (TTL) (#7, Figure 5). This signal must be at
least 10 µs.
The time course of the signals at input and outputs is illustrated in Figure 6.
Figure 6: scheme of operation
At the beginning of the DELAY time a TTL signal (+5 V, 1 µs) is generated at TRIGGER
OUT. This TTL signal can be used to trigger an oscilloscope. After the DELAY, the PULSE
starts immediately. After the end of the PULSE the second cycle begins and so on, i.e. the time-
lag between the pulses is determined by the DELAY (x 0.01 ms) switch (#2, Figure 5).

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5. Technical Data
TMR-02M
PULSE (x 0.01 ms) switch: 5 digits thumb wheel, 0.01 to 999.99 ms, digital
DELAY (x 0.01 ms) switch: 5 digits thumb wheel, 0.01 to 999.99 ms, digital
CYCLES switch: 3 digits thumb wheel, 1 to 999
TIMER OUT: BNC connector, TTL signal
TRIGGER OUT: BNC connector, TTL signal, 1 µs
TRIGGER IN: BNC connector, TTL signal, 10 µs minimum
Size: front panel: 12 HP (60.6 mm) x 3U (128,5 mm),
7” (175 mm) deep