FX2505 Datasheet, PDF (2/3 Pages) List of Unclassifed Manufacturers – Hydrogen Thyratron

NOTES
1. The tube should preferably be clamped by the base only.
Any clamps used on the bulb must not extend beyond
63.5 mm (2 ¹/₂ inches) above the top of the base and
should be made from material of low thermal conductivity.
2. For instantaneous starting applications the maximum
permissible peak forward voltage is 8.0 kV and there must
be no overshoot.
3. In pulsed operation the peak inverse anode voltage,
exclusive of a spike of 0.05 ms duration, must not exceed
2.5 kV during the first 25 ms after the pulse.
4. This rate of rise refers to that part of the leading edge of
the pulse between 25% and 75% of the pulse amplitude.
5. Measured with respect to cathode potential.
6. The typical figures are obtained on test using conditions of
minimum grid drive. Improved performance can be
expected by increasing the grid drive.
7. The time interval between a point on the leading edge of
the unloaded grid pulse at 25% of the pulse amplitude and
the point where anode conduction takes place.
8. Normally taken as the drift in delay time over a 5-minute
run at full ratings between the second and seventh minutes
of operation.
9. The variation of firing time measured at 50% of current
pulse amplitude.
10. The recovery characteristics are controlled on a sampling
basis.
HEALTH AND SAFETY HAZARDS
E2V Technologies hydrogen thyratrons are safe to handle and
operate, provided that the relevant precautions stated herein are
observed. E2V Technologies does not accept responsibility for
damage or injury resulting from the use of electronic devices it
produces. Equipment manufacturers and users must ensure that
adequate precautions are taken. Appropriate warning labels and
notices must be provided on equipments incorporating E2V
Technologies devices and in operating manuals.
High Voltage
Equipment must be designed so that personnel cannot come
into contact with high voltage circuits. All high voltage circuits
and terminals must be enclosed and fail-safe interlock switches
must be fitted to disconnect the primary power supply and
discharge all high voltage capacitors and other stored charges
before allowing access. Interlock switches must not be
bypassed to allow operation with access doors open.
X-Ray Radiation
All high voltage devices produce X-rays during operation and
may require shielding. The X-ray radiation from hydrogen
thyratrons is usually reduced to a safe level by enclosing the
equipment or shielding the thyratron with at least 1.6 mm
( ¹/₁₆ inch) thick steel panels.
Users and equipment manufacturers must check the radiation
level under their maximum operating conditions.
MAXIMUM RECOVERY CHARACTERISTICS
40
3607A
36
32
28
GRID VOLTAGE = 0 V
24
7^12.5
20
16
7²⁵
7⁵⁰
12
7¹⁰⁰
8
4
0
0.1
0.5
1.0
5.0
GRID RECOVERY IMPEDANCE (kO)
PEAK ANODE CURRENT
100 A
RE-APPLIED ANODE VOLTAGE 1 kV
10
50
100
FX2505, page 2
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