NL7703LP2

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NL7703LP2 - NL7703LP2

NL7703LP2
IGNITRON
7703LP2 ignitron suitable switch either capacitor discharge service electronic crowbar, peak voltages from hundred volts kilovolts, peak currents kiloamperes.
GENERAL DATA Electrical: Cathode Spot Starting Ignitor Number Electrodes Anode Cathode Ignitors Inductance (approximate) Mechanical: Envelope Stainless Steel Anode Material- Molybdenum Mounting Position Axis Vertical, Anode Weight -2.9 (1.3 Diameter 2-1/8" Seated Height (Nominal) 7-1/16" Ignitor Ratings: Voltage Open Circuit (Ignitor Inverse (Ignitor Current, Short Circuit Length Firing Pulse, Sine Wave
1500 -100
3000
Thermal: Type Cooling Convection, Liquid, water cooled clamp (p/n 1K1703 recommended) around lower portion tube. (see page details) Ambient Temperature Cathode Temperature (MAX) Anode Header Temperature (MAX) Anode Cathode Temperature -(Note
June
2008 RICHARDSON ELECTRONICS, LTD. RICHARDSON ELECTRONICS, AFFILIATES RESERVE RIGHT MAKE CHANGES PRODUCT(S) INFORMATION CONTAINED HEREIN WITHOUT NOTICE. RICHARDSON ELECTRONICS ASSUMES RESPONSIBILITY ERRORS WHICH APPEAR THIS DOCUMENT. PART THIS DOCUMENT COPIED REPRODUCED FORM MEANS WITHOUT PRIOR WRITTEN CONSENT RICHARDSON ELECTRONICS, LTD.
Maximum Ratings Damped Discharge Ringing Discharge Peak Anode Voltage Forward 35,000 35,000 Inverse 35,000 35,000 Critical Anode Starting Voltage (MIN) -100 Anode Current Peak 100,000 100,000 Average -0.75 -0.25 Maximum Average Time Cycle Rate Rise Current (Note (Note Discharge (Rep Rate) Typical Minute Total Charge (Per Minute) Coulombs Ionization Time -0.5 -0.5 Voltage Reversal None
WARNING! USING SIMULTANEOUS MAXIMUM RATINGS WILL SEVERELY DETERIORATE IGNITRON LIFE! Notes: prevent mercury condensation anode anode seals, anode header temperature should 10°C higher than cathode temperature times. Before operation, elevate temperature anode area, with respect cathode, long enough remove mercury from portion ignitron. Rate rise depends upon external circuitry. Tube Life Considerations method used determine life expectancy ignitron varies according application necessary consider various types separately. must understood that ratings specified absolute limits. responsibility equipment designer ensure that specified limits cannot exceeded under worse possible conditions component tolerance, voltage fluctuation, load variation. general rule thumb: obtain longer life, ignitron must operated lower levels. Typically, life increased either voltage current halved. Ignitrons robust high current switching devices. current ratings exceeded some extent without destroying ignitron with consequence reduced life. IGNITOR ignitor small semiconducting material with pointed that partially immersed into cathode pool. When suitable current pulse passed through ignitor-mercury junction (with ignitor being positive with respect cathode pool) forms cathode spot surface mercury free electrons emitted. anode sufficiently positive with cathode this time, will form between cathode anode. Once initiated, ignitor further control ignitron continues conduct until voltage across ignitron falls below ionization potential mercury vapor. capacitor discharge circuits ignitron pass very high current conditions naturally harmful ignitron. mercury pool ignitor itself will become contaminated best life will obtained high energy pulse applied ignitor. Under these conditions pulse from separate excitation circuit containing capacitor charged from 1500V 3000V will provide Joules energy ignitor. Richardson Electronics endorses National Electronics Ignitrons using these parameters. Considering wide range ignitors available across range ignitrons produced, Richardson Electronics recommends that ignitor pulse providing Joules optimal. Page
MOUNTING performance life ignitron greatly improved operated field free space. Magnetic fields tend force toward tube sidewall aggravate sidewall arcing. Metal vapor produced sidewall arcing major contributors ignitor wetting. recommend coaxial type mounting minimize field effects. Page details.
INSTALLATION INFORMATION RECOMMENDED CONDITIONING BEFORE INITIAL ignitron high voltage operating condition before leaving factory. Shipping tends redistribute mercury throughout ignitron making certain conditioning steps desirable before installation. Heat Conditioning Before applying voltage, heat anode stud 100-1250C (keeping cathode near room temperature) hours minimum. This drives mercury away from anode anode seal area. Voltage Conditioning (after Heat Conditioning) Apply 110% operating voltage (preferably DCV) 110% rated maximum voltage across ignitron (anode positive ignitor connected) with series combination capacitor resistor parallel with ignitron. NATIONAL will replace ignitron that will hold minimum voltage initial test when caused manufacturing defect. Additional conditioning higher voltages recommended stabilize ignitron after shipping. Slowly increase voltage above minimum. Breakdown occur ignitron will attain Hi-Pot Stabilization Voltage approximately 125% operating voltage, 125% rated maximum voltage. NOTE: time required conditioning Hi-Pot Stabilization Voltage reduced using variable voltage source connected directly across ignitron (ignitor connected). Slowly increase voltage; limit current milliamperes maximum. RECOMMENDED PRACTICE AFTER INITIAL Mercury condensed anode anode seal area greatly decreases ignitron's voltage hold-off ability. Heat conditioning before initial complements proper mercury distribution before ignitron first placed operation. Once operation, maintain thermal gradient that anode area least 10°C greater than cathode. This also true during cooling period. anode anode area must cool faster than cathode. ignitor becomes susceptible damage movement mercury after capacitor discharge crowbar application. maximum life, recommend that ignitron moved until end-of-life once been placed service. LIFE WARRANTY Richardson Electronics, Ltd. warrants tube types listed above free from defects design, material, workmanship when received and, after receiving Recommended Conditioning Before Initial Use, operate satisfactorily when first installed and, used within ratings, give minimum 1000 operations. adjustment will made tube placed service within months after date shipment manufacturer. This warranty expires months after date shipment manufacturer. National High Voltage Switching Ignitrons have expected life many times warranted number operations most applications. Operating within recommended ratings following Recommended Practices After Initial will greatly increase life operations obtained. AVAILABLE ACCESSORIES Part Number 1K1703 1K1508P 1M2602 1K958-Series Description Coax Mounting Adapter (See page Anode Extention Adapter (See page Ignitor Tulip Clip Connector (See page Ignitor Tulip Clip/Cable Assembly (Various options available, check with your local Richardson representative details.) Ignitor Trigger Module (Works National Ignitrons.) Page
IG5F2-10
OUTLINE DRAWING
ANODE TERMINAL 1/2-20
BOTTOM VIEW
INSULATING COMPOUND
IGNITOR
IGNITOR
EVACUATION TUBE
1/16
ANODE TERMINAL HOLE DEEP
3/16
CATHODE TERMINAL CLAMP COOLED AREA. 2-1/8 0.25 1-3/4 MIN. WIDTH
VIEW
IGNITOR TERMINALS .010 .250 .030 EXHAUST TUBE
Page
Recommended Mounting Procedures:
Thread 1K1508P anode extension onto anode bolt ignitron. EXCEED TORQUE WHEN TIGHTENING PLACE. EXCESSIVE TORQUE CAUSE DAMAGE TUBE VOID WARRANTY! Mount 1K1703 Coax Mounting Adapter chassis your equipment, Insert tube into 1K1703 tighten hose clamp using screwdriver driver. Attach anode connection (supplied customer) thread captive nut. HAND TIGHTEN ONLY THIS TIME. Loosen hose clamp 1K1703 then using opposing wrenches tighten captive secure anode connection place, shown Fig. UNDUE STRESS (>20 lb.) ANODE TUBE. THIS WILL CAUSE GLASS CRACK, LOSE VACUUM VOID WARRANTY! Position tube 1K1703 that tube will clamped correct area (see outline drawing page then tighten hose clamp secure tube place. Connect water cooling lines 1K1703 with hose clamps (not supplied). Connect ignitor terminal ignitor, shown Fig. APPLY SIDEWAYS FORCE IGNITOR TERMINAL. DOING CAUSE GLASS INSULATOR CRACK TUBE WILL LOSE VACUUM VOID WARRANTY!
Fig.
Fig.
Fig.
Page

NL7703LP2

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