Parker IOTA ONE Series Bedienungsanleitung

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IOTA ONE

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SAFETY PRECAUTIONS

MANUAL – Before attempting to install or operate the unit, read and familiarize

yourself with all of the safety, installation, and operational instructions in this

manual. This manual contains valuable safety, operational, and troubleshooting

information and should be maintained for future reference.

WARNINGS – For personal safety and to insure correct operation of the unit,

know and follow all warnings. In particular, this instrument produces high voltage

spikes. Do not operate the instrument without a valve attached to the instrument

through the supplied cable. Do not connect or disconnect valve or valve cable

while the instrument is operating.

POWER SOURCES – Use only power sources that are within the specified limits

and which are capable of providing the specified power outputs for this unit.

GROUNDING – Make certain that the power source is properly grounded.

DISASSEMBLY – DO NOT attempt to disassemble the unit beyond what is

described in the User's Manual. Disassembly will expose high voltages that

could cause severe electrical shock.

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TABLE OF CONTENTS

Table of Contents

Section 1 General Information

1.1 Scope

1.2 Purpose of equipment

1.3 Description of instrument

1.4 Specifications

1.5 Equipment supplied

1.6 Accessories required but not supplied

1.7 Optional test equipment

Section 2 Installation

2.1 Unpacking

2.2 Installation

2.3 Driver Settings

2.4 Connections

2.5 Checkout

Section 3 Operation

3.1 Front Panel controls and indicators

3.2 Operating modes

3.2.1 Internal one shot

3.2.2 Internal cycle

3.2.2.1 ON/OFF

3.2.2.2 Frequency

3.2.3 External one shot

3.2.4 External cycle

3.3 Memory save/recall

3.4 Remote operation

3.5 Operational notes and limits

Appendix A Differences Between IOTA ONE®Versions

Appendix B Remote Interface Communications Protocol

LIST OF FIGURES

Figure 1.1 View of front panel with functions labeled

Figure 2.1 View of driver board with labeling of burst timing DIP switch and

hold in jumpers

Figure 3.1 Screen shot of the remote software GUI application

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SECTION 1

GENERAL INFORMATION

1.1 SCOPE

This manual describes the operation of the IOTA ONE®valve driver instrument,

Parker part number 060-0010-900. This instrument is similar in operation and

performance to the Parker part number 060-0001-900 instrument, but with

electronic displays, increased timing accuracy, and remote operation capability.

For those users familiar with the older 0001 version, Appendix A describes the

major differences between the two.

1.2 PURPOSE OF EQUIPMENT

The IOTA ONE®is a complete system for driving molecular beam pulsed

sources for laser spectroscopy experiments. Supersonic carrier gas pulses for

Helium, Argon, etc. can be controlled in place of “CW”, thus reducing the size

and cost of high vacuum systems. Synchronizing the gas pulse with the laser

pulse reduces the pumping size, increases the signal to noise ratio and lowers

the temperature. Molecules are cooled without changing to liquid and therefore,

higher peak intensities can be achieved due to the simpler spectra of cold

molecules. Less sample is used.

The IOTA ONE® can be rack mounted or used on a bench. Pulse duration

ranges in microseconds, milliseconds or minutes can be selected. Both ON

TIME and OFF TIME settings can be changed while running. The instrument is

capable of repetition rates up to 250 Hz; however, the valve may not operate

correctly at higher rates. The unit can be triggered both internally or externally

and has “one shot” capability. Both input and output logic-level (TTL) signals are

through the front panel BNC jacks.

1.3 DESCRIPTION OF INSTRUMENT

The front panel of the IOTA ONE® is depicted in Figure 1.1. Following is a

description of the controls, indicators, and connectors on the front panel:

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Figure 1.1 View of Front Panel Showing Controls, Indicators, and Connectors

“ON-TIME” Section

1. INDICATOR – A red LED that lights whenever the valve is open. Note that

the human eye may not respond to light pulses that are less than 3 milliseconds.

The LED is actually illuminated a few milliseconds longer than the valve is open

so that it can be seen. Because of persistence of vision, the LED may appear to

remain on for high repetition rates.

2. DURATION – A four-digit digital display indicates the “ON” (open) time of the

valve reading from 0001 to 9999. Up and down push-button switches below the

display permit the user to increment and decrement the value of each digit. Note

that the display automatically carries over to the next digit(s) when incrementing

past 9 and decrementing past 0.

3. RANGE – Four-position momentary switch/indicators determine the time

range for the “ON-TIME DURATION” switch: microseconds, milliseconds,

seconds, or minutes.

“OFF-TIME” Section

4. INDICATOR – A red LED that lights whenever the valve is closed. Note that

the human eye may not respond to light pulses that are less than 3 milliseconds.

The LED, therefore, may appear to be off during short off-time durations.

Likewise, for very high repetition rates, the LED may appear to remain on.

5. DURATION – A four-digit digital display indicates the “OFF” (closed) time of

the valve reading from 000.0 to 999.9. Up and down push-button switches below

On Indicator LED Off Indicator LED

Timing Error LED

Memory

Save/Recall

Power Switch/

Pilot Light

On Time Range

On Time Adjustments

Off Time Range

Off Time

Adjustments

Mode Select

External Trigger

and Indicator

Valve Jack

Remote Input

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the display permit the user to increment and decrement the value of each digit.

Note that the display automatically carries over to the next digit(s) when

incrementing past 9 and decrementing past 0.

6. RANGE – Four-position momentary switch/indicators determine the time

range (milliseconds, seconds, or minutes) or selects frequency mode for the

“OFF-TIME DURATION” switch.

OTHER CONTROLS, INDICATORS, AND CONNECTORS

7. ERROR – A red LED that lights when the operating parameters are set

outside allowable limits.

8. START -- This momentary contact push button switch starts action in the

INTERNAL mode by triggering a single pulse (ONE SHOT) or starting a series

of pulses (CYCLE).

9. STOP - This momentary contact push button switch stops any timing that

may be active and restores the valve to the OFF condition. If the instrument is

operating in a mode that is independent of timing (EXTERNAL CYCLE MODE),

this control will have no effect.

10. INTERNAL/EXTERNAL – These four momentary switch/indicators select

the operating mode and signal sources for the system.

11. INPUT (TTL) – This BNC jack allows the unit to be triggered from an

external source. The input signal should be low (0 volts) for off and high (+5

volts) for on.

12. SIGNAL – This green push button/LED serves two functions. As an

indicator, it illuminates to show a logic high on the external signal source. As a

control, it serves as an input that is active as a signal source. It is active when

depressed.

13. OUTPUT (TTL) – A logic high (TTL) output is provided at this BNC jack

whenever the valve driving circuit is active in any operating mode.

14. POWER – A retained action switch to control the AC power to the unit. The

face of this switch will illuminate when depressed if proper AC voltage is present

and the fuses are functional.

15. VALVE – This jack is the connection to the valve through the supplied valve

cable.

16. RS-232 – This jack is the RS-232 connection for remote monitoring and

control.

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17. SAVE -- This momentary push button saves the current settings of the

instrument to non-volatile memory. Upon power up, the instrument loads the

most recent SAVE settings.

18. RECALL – This momentary push button restores the most recent SAVE

settings to the instrument.

On the rear panel of the IOTA ONE® is a power input module with a standard

IEC detachable cord socket for the AC power cord. In addition this module

contains a drawer above the socket that houses the two 5 X 20 mm AC fuses.

AC power requirements as well as fuse size appear on the rear panel as well as

in section 1.4 (Specifications).

1.4 SPECIFICATIONS

Size: Standard 19-inch relay rack, 3U high by 10” deep excluding handles.

Weight: 11pounds.

Voltage input: 90 – 250 VAC, 47 – 63 Hz,

Power consumption: 160VA max.

Fuses (Qty 2): 5 x 20 mm glass cartridge, 2.0 A, 250 V

Power factor: 0.93 min

Operating temperature: 0 to +40 degrees C

Storage temperature: -20 to +60 degrees C

Humidity: 20 – 90 %, non-condensing

Shock and Vibration: As incurred in bench handling.

Logic-Level (TTL) output: one TTL unit load.

Logic-Level (TTL) input: compatible with standard TTL logic.

Valve Burst: 300 V max

Timing accuracy: 250 nanoseconds or 0.001%, whichever is greater.

Timing uncertainty (with respect to external trigger): 250 nanoseconds.

1.5 EQUIPMENT SUPPLIED

The IOTA ONE® instrument is supplied with the following:

Power cord

Valve cable

IOTA ONE® remote software for PC

This operator's manual

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1.6 ACCESSORIES REQUIRED BUT NOT SUPPLIED

To operate the IOTA ONE® instrument, a Parker valve must be ordered

separately. No additional equipment is required.

In the event of abnormal operation, the instrument should be put into the hands

of a qualified technician to troubleshoot the problem.

1.7 OPTIONAL TEST EQUIPMENT

In order to use the external logic-level (TTL) input, an external pulse generator or

push-button switch will be required. If an automated test setup is to be used, this

input can be exercised directly from a computer-controlled logic source.

In order to use the external logic-level (TTL) output, an oscilloscope or other

monitoring equipment will be required. If an automated test setup is to be used,

this output can be monitored directly through a computer-controlled logic input or

a data logging device.

In order to use the remote monitor and control feature, a PC with a COM port will

be required. If an automated test setup is to be used, the remote monitor and

control functions can be accessed through an RS-232 port implemented in the

automated equipment. A standard DTE/DCE RS-232 cable is required to

connect the instrument to the remote equipment.

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SECTION 2

INSTALLATION

2.1 UNPACKING

Before unpacking the IOTA ONE® , examine the packing container and notify the

shipping carrier of any damage. Unpack the contents of the container carefully

and take inventory of the contents. Save the container and the packing material

in the event that the instrument needs to be returned to the factory for servicing.

The following items should be inventoried:

IOTA ONE® instrument

Power cord

Valve cable

IOTA ONE® remote software for PC

This operator's manual

In addition to these items, a valve will be included in the packing container if one

was ordered with the instrument.

2.2 INSTALLATION

The IOTA ONE® instrument is designed to operate in a bench-top environment or

mounted in a standard 19” relay rack. Rack mounting flanges with standard-

spaced holes are provided for rack-mounting. To mount the instrument in a rack,

use standard rack hardware. Rear support of the instrument is not required.

2.3 DRIVER SETTINGS

The IOTA ONE® embodies a high performance valve driver that reduces the

turn-on time of the valve by applying a short high voltage burst to overcome the

inductance inherent in the valve coil. Following the high voltage burst, the driver

reduces the voltage to the valve to a value that is lower than the rated voltage of

the valve, but is sufficient to hold it open. This reduces valve heating and

improves closing response time. Both the time of the burst and the hold in

voltage can be set by the user using the following procedure:

2.3.1 Turn the unit off and disconnect the power cord to insure that no

dangerous voltages are present inside the instrument.

2.3.2 Remove the top cover by taking out the two screws on the back panel and

sliding the cover to the rear.

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2.3.3 The instrument is factory set for a burst pulse length of 180 microseconds.

To change the burst pulse length, find the 8-position DIP switch as designated on

Figure 2.1. The base (minimum) length is 50 microseconds. Setting one or

more of the DIP switches OFF adds to this base time setting. The values of the

switches are as follows:

Switch # Value

(microseconds)

1 100

2 100

3 100

4 80

5 40

6 20

7 10

8 5

Figure 2.1

Locations of Burst Timing DIP Switch and Hold In Jumper on Driver Board

The standard setting has switches 1, 6, and 7 OFF for a total pulse length of 180

microseconds. This setting has been found to be sufficient to operate most pulse

valves consistently. Valves having an orifice larger than 1.0 mm and/or operating

at higher pressure differentials (greater than 100 PSIG) may require a longer

Burst Timing Dip Switch

Hold in Jumper

Pilot light Connector

IRF 840 4001 IRF 540

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