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Kentech Instruments J14080131 Manual

Two channel gated optical intensifier
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Kentech Instruments Ltd.
Two Channel Gated Optical Intensifier
Serial Number J14080131
Last Modified 5-2-15
PLEASE READ THIS MANUAL CAREFULLY BEFORE USING THE UNIT
Print in colour not in Black and White.
Hazard information is coloured RED
Kentech Instruments Ltd.,
Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K.
Tel: +44 (0) 1491 82 1601
E-mail info@kentech.co.uk
Web www.kentech.co.uk

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  • Page 1 Kentech Instruments Ltd. Two Channel Gated Optical Intensifier Serial Number J14080131 Last Modified 5-2-15 PLEASE READ THIS MANUAL CAREFULLY BEFORE USING THE UNIT Print in colour not in Black and White. Hazard information is coloured RED Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K.

  • Page 2: Table Of Contents

    RS232 INTERFACE ........................24 13.11.1 THE PROTOCOL ........................25 13.12 COMMANDS FOR CHANNEL 1 (A) ..................26 13.13 COMMANDS FOR CHANNEL 2 (b) ..................29 Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 3 Magnetic field computed data and various limits ............ 56 Appendix 2 XML response ......................57 Appendix 3 JSON response ......................61 Appendix 4 Operation without magnets in the head ..............62 Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 4 Ch1 Shortest gate - digitised and normalised ............49 Figure 37 Tube response......................51 Figure 38 Tube response......................53 Figure 39 Tube manufacturer’s instructions ................54 Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 5: Declaration Of Conformity

    The following documents contain additional relevant information:- Kentech file reference J1408131 Name: Signature: A.K.L. Dymoke-Bradshaw n behalf of Kentech Instruments Ltd Position: Issued: Director . February 2015 Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 6: Disclaimer

    GOI or expose any part of its circuitry. In the event of malfunction, the GOI must be returned to Kentech Instruments Ltd. or its appointed agent for repair. The accessible terminals of this instrument are protected from hazardous voltages by basic insulation and protective grounding via the IEC power input connector.

  • Page 7: Abbreviations

    Neutral Density Photo Cathode Pulse Repetition Frequency PSU or psu power supply unit Standard Deviation software Uniform Resource Locator w.r.t. With Respect To Extensible Markup Language Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 8: Introduction

    Jitter SD <20ps , typical figures <4ps Trigger requirements 500V into 50Ω with <1ns rise. Length of umbilical nominally 3m Dimensions 3U, 19inch x 500mm Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 9: Principals Of Operation

    “OFF” edge of the gate pulse in medium mode. In fast mode the gate width is only controlled by the reverse bias applied to the cathode. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 10: Connections And Mechanics

    The tube serial numbers as well as the channel numbers are labelled both on the heads and on the rear panel of the driver. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 11 The jacks are fitted to the bracket through an anti-rotation slot. It is also advisable to inspect and clean out loose debris from the internal surfaces with compressed air or a gas duster can before mating. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 12: The Heads

    On the rear face are four holes on a 68 mm square. They are tapped M3 and screws can protrude into them by 12mm but only 7mm is tapped. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 13: Connecting The Trigger Unit

    The cables should not degrade the fast (sub ns rise time) trigger pulse that the trigger unit delivers. If long cable runs are needed then the cable quality may need to be upgraded. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 14: Powering Up The System

    The delay between initial trigger at the front panel and the gate pulse getting to the intensifier is shown in the specifications, see section 7 on page 8. The camera could be triggered from the signal Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 15: Delay Adjustment

    A >100mW peak power laser diode with a ≤ 60ps pulse duration is suitable. In both cases a pre-trigger signal is required with a lead time ~50ns. It Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 16 The most convenient way to obtain the gate time is with a photodiode monitoring the output signal and plotting the output intensity while stepping the delay. The source and camera Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 17 This test is most sensitive if the timing is set such that the image is approximately 50% of peak brightness, i.e. the source is changing most rapidly. Figure 2 Input window Figure 3 Output window Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 18: Goi Software Interface

    The GOI has 4 primary operating modes, INHIBIT, FAST, SLOW and DC. Note that the “medium” mode is not distinguished in software. The primary operating mode is determined by the value in the variable b_goi_mode. 0 = Inhibit Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 19: Inhibit Mode

    The slow gate width can be changed by writing the desired gate width in ns to b_slow_width. In SLOW mode the slow LED is illuminated. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 20: Dc Mode

    The results of the self test can be read from [for channel 2(b)] b_status 0 = normal non zero = self test fail Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 21: Default Settings

    The values of all the system variables, together with data type and limits can be obtained by a GET operation to http://192.168.2.215/i.xml or http://192.168.2.215/i.json. Here is an example of responses using POSTER Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 22 Figure 4 Example responses using POSTER with xml response Figure 5 Example responses using POSTER with json response Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 23 If no variables have changed, the GOI will pause for 2 seconds or so before responding. This is done to limit web traffic if it is continually polled. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 24: Rs232 Interface

    Write to variables JSON 13.11 RS232 INTERFACE The RS232 interface is set to 115.2 kBaud, 8 data bits, 1 stop bit, no parity, no handshake. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 25: The Protocol

    No execution will result. 3) as above with invalid parameter 5000 b!gm and the response would be:- {5000 b!gm;?param} Again no execution will result. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 26: Commands For Channel 1 (A)

    Name a@swidth Explanation read slow gate width, i.e. read a_slow_width Format a@sw Parameters none Returned values r1 = {100, 1000000, x1ns} slow gate width Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 27 Parameters none Returned values r1 = {0, 1} overload flag state Name a!trigf Explanation write triggered flag, i.e. write to a_trig_flag Format p1 a!tr Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 28 = {0, 55000, x1ps} trigger delay, i.e. value of a_trig_delay r9 = {0, 1} dconf flag, i.e. value of a_dc_on r10 = {0, 1} status flag, i.e. value of a_status Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 29: Commands For Channel 2 (B)

    Name b@swidth Explanation read slow gate width, i.e. read b_slow_width Format b@sw Parameters none Returned values r1 = {100, 1000000, x1ns} slow gate width Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 30 Returned values none Name b@ovld Explanation read overload flag, i.e. read b_ovld_flag Format b@ov Parameters none Returned values r1 = {0, 1} overload flag state Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 31 = {0, 55000, x1ps} trigger delay, i.e. value of b_trig_delay r9 = {0, 1} dconf flag, i.e. value of b_dc_on r10 = {0, 1} status flag, i.e. value of b_status Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 32: Commands Which Are Channel Independent

    = {0, 255} read serial no. Name safe Explanation put both channels of the GOI into inhibit mode Format safe Parameters none Returned values none Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 33: Example Comms

    Read fast mode, should be default value of zero... b@fm {b@fm;0 } Read trigger delay, should be default value of 0ns... b@td {b@td;0 } Read status, should be normal value of zero... b@tst Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 34 {1 b!dc} Set gain to 200..200 b!ga {200 b!ga} Set trigger delay to 25ns..25000 b!td {25000 b!td} Set fast mode 3..3 b!fm Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 35: Setting The Goi Up In Dc Mode From A Cold Start

    Look for image, can’t see it because it is too dim, so increase the gain 100 b!ga {100 b!ga} Switch cathode on again DC for 5 seconds by setting DC on flag 1 b!dc {1 b!dc} Etc. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 36: Setting The Goi Up In Fast Mode From A Cold Start

    800 b!ga {800 b!ga} Check triggered flag is zero b@tr {b@tr;0 } Now apply a trigger signal, and check triggered flag again... b@tr {b@tr;1} Success Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 37: Electrical Wave Forms

    Time (ns) Fast and medium gate voltages 1000 Volts -500 -1000 -1500 Time (ns) Figure 10 Fast and medium gate waveforms Showing relative timing (typical data) Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 38 Shorter medium gate voltage waveforms 1000 Volts -500 -1000 -1500 10.5 11.5 12.5 13.5 Time (ns) Figure 11 Medium gate waveforms showing relative timing of the edges (typical data). Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 39: Optical Gate Waveforms Channel 1 (A)

    Made with a 40ps laser diode. Figure 13 Ch1 Speed 0 Time right to left ~90 ps. Figure 12 Ch1 Speed 1 Time right to left ~ 105ps Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 40 Figure 14 Ch1 Speed 2 Time right to left ~ 130ps Figure 15 Ch1 Speed 3 Time right to left ~ 270ps Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 41 Figure 16 Ch1 Speed 4 Time right to left ~ 500ps. Figure 17 Ch1 Speed 5 Time right to left ~ 1ns Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 42 Figure 18 Ch1 Speed 6 Time right to left ~ 2ns. Figure 19 Ch1 Speed 7 Time right to left ~3.5ns Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 43 Figure 20 Ch1 Speed 8 Time right to left ~ 4ns. Figure 21 Ch1 Speed 9 Time right to left ~ 5ns Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 44 Ch1 Shortest gate - digitised and normalised Time left to right The pre-cursor is due to the sampling laser diode not turning fully off at the end of its pulse. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 45: Optical Gate Waveforms Channel 2 (B)

    OPTICAL GATE WAVEFORMS CHANNEL 2 (b) Figure 24 Ch2 Speed 0 Time right to left ~90 ps. Figure 25 Ch2 Speed 1 Time right to left ~90 ps. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 46 Figure 26 Ch2 Speed 2 Time right to left ~90 ps. Figure 27 Ch2 Speed 3 Time right to left ~90 ps. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 47 Figure 28 Ch2 Speed 4 Time right to left ~90 ps. Figure 29 Ch2 Speed 5 Time right to left ~90 ps. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 48 Figure 31 Ch2 Speed 6 Time right to left ~90 ps. Figure 32 Ch2 Speed 7 Time right to left ~90 ps. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 49 Figure 33 Ch2 Speed 8 Time right to left ~90 ps. Figure 34 Ch2 Speed 9 Time right to left ~90 ps. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 50 Ch1 Shortest gate - digitised and normalised Time left to right The pre-cursor is due to the sampling laser diode not turning fully off at the end of its pulse. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 51: Tube Data

    TUBE DATA Channel 1/a Table 1 Tube data Channel 1/a Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 52 Figure 37 Tube response Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 53: Table 2 Tube Data Channel 2/B

    Channel 2/b Table 2 Tube data Channel 2/b Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 54 Figure 38 Tube response Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 55 Figure 39 Tube manufacturer’s instructions Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 56: Appendix 1 Magnetic Field Computed Data And Various Limits

    With suitable screening the "non-magnetic" status is easily achievable. This data is obtained computationally and is advisory only. Always check actual units in critical situations. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 57 <a_fast_width> <type>number</type> <read_only>false</read_only> <value>50</value> <dp>0</dp> <min>50</min> <max>6000</max> </a_fast_width> <a_slow_width> <type>number</type> <read_only>false</read_only> <value>0</value> <dp>0</dp> <min>0</min> <max>0</max> </a_slow_width> <a_mcp_gain> <type>number</type> <read_only>false</read_only> <value>0</value> <dp>0</dp> <min>0</min> <max>1000</max> </a_mcp_gain> <a_trig_delay> Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 58 <read_only>false</read_only> <value>0</value> </a_dc_on> <a_ovld_flag> <type>flag</type> <read_only>false</read_only> <value>0</value> </a_ovld_flag> <a_trig_flag> <type>flag</type> <read_only>false</read_only> <value>0</value> </a_trig_flag> <a_status> <type>number</type> <read_only>false</read_only> <value>0</value> <dp>0</dp> <min>0</min> <max>255</max> </a_status> <b_ovld_flag> <type>flag</type> <read_only>false</read_only> <value>0</value> Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 59 <value>0</value> <modes> <element>0</element> <element>1</element> <element>2</element> <element>3</element> </modes> </b_goi_mode> <b_fast_width> <type>number</type> <read_only>false</read_only> <value>80</value> <dp>0</dp> <min>50</min> <max>6000</max> </b_fast_width> <b_mcp_gain> <type>number</type> <read_only>false</read_only> <value>0</value> <dp>0</dp> <min>0</min> <max>1000</max> </b_mcp_gain> <b_slow_width> Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...
  • Page 60 <value>100</value> <dp>0</dp> <min>0</min> <max>0</max> </b_slow_width> <b_trig_delay> <type>number</type> <read_only>false</read_only> <value>0</value> <dp>0</dp> <min>0</min> <max>0</max> </b_trig_delay> <b_status> <type>number</type> <read_only>false</read_only> <value>0</value> <dp>0</dp> <min>0</min> <max>255</max> </b_status> </values> <words> </words> </response> Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 61: Appendix 3 Json Response

    Appendix 3 JSOn ReSpOnSe {“serial_no”:1,”job_no”:1401031,”success”:true,”values”:{“a_fast_mode”:{“type”:”mode”,”read_ only”:false,”value”:0,”modes”:[0,1,2,3,4,5,6,7,8,9]},”a_fast_width”:{“type”:”number”,”read_on ly”:false,”value”:50,”dp”:0,”min”:50,”max”:6000},”a_slow_width”:{“type”:”number”,”read_on ly”:false,”value”:0,”dp”:0,”min”:0,”max”:0},”a_mcp_gain”:{“type”:”number”,”read_only” :false,”value”:0,”dp”:0,”min”:0,”max”:1000},”a_trig_delay”:{“type”:”number”,”read_only ”:false,”value”:0,”dp”:0,”min”:0,”max”:0},”a_goi_mode”:{“type”:”mode”,”read_only”:fals e,”value”:0,”modes”:[0,1,2,3]},”b_dc_on”:{“type”:”flag”,”read_only”:false,”value”:0},”a_ dc_on”:{“type”:”flag”,”read_only”:false,”value”:0},”a_ovld_flag”:{“type”:”flag”,”read_ only”:false,”value”:0},”a_trig_flag”:{“type”:”flag”,”read_only”:false,”value”:0},”a_ status”:{“type”:”number”,”read_only”:false,”value”:0,”dp”:0,”min”:0,”max”:255},”b_ ovld_flag”:{“type”:”flag”,”read_only”:false,”value”:0},”b_trig_flag”:{“type”:”flag”,”read_ only”:false,”value”:0},”b_fast_mode”:{“type”:”mode”,”read_only”:false,”value”:0,”modes”:[0 ,1,2,3,4,5,6,7,8,9]},”b_goi_mode”:{“type”:”mode”,”read_only”:false,”value”:0,”modes”:[0,1,2 ,3]},”b_fast_width”:{“type”:”number”,”read_only”:false,”value”:80,”dp”:0,”min”:50,”max”:6 000},”b_mcp_gain”:{“type”:”number”,”read_only”:false,”value”:0,”dp”:0,”min”:0,”max”:100 0},”b_slow_width”:{“type”:”number”,”read_only”:false,”value”:100,”dp”:0,”min”:0,”max”:0 },”b_trig_delay”:{“type”:”number”,”read_only”:false,”value”:0,”dp”:0,”min”:0,”max”:0},”b_ status”:{“type”:”number”,”read_only”:false,”value”:0,”dp”:0,”min”:0,”max”:255}},”words”:{}} Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

  • Page 62: Appendix 4 Operation Without Magnets In The Head

    Do not attempt to remove the magnets without the relevant jacking screws and guides as there is a real risk of damage to both the intensifier and one’s fingers. Kentech Instruments Ltd., Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. Last Modified 5-2-15...

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