E2V Technologies Inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY10523-1482 USA Telephone: (914) 592-6050 Facsimile: (914) 592-5148
e-mail: enquiries@e2vtechnologies.us
#E2V
Technologies Limited 2002
A1A-CX1622 Issue 5, October 2002
527/5640
MAXIMUM AND MINIMUM RATINGS
(Continued)
Min
Max
NOTES
1. The tube must be fitted using its mounting flange.
2. A large area anode connector, E2V Technologies type
MA360A, is recommended.
3. Cooling of the anode stem is necessary under conditions of
high voltage and high anode dissipation in order to avoid
damage to the tube.
4. The maximum permissible peak forward voltage for
instantaneous starting is 25 kV and there must be no
overshoot.
5. The peak inverse voltage must not exceed 10 kV for the
first 25
ms
after the anode pulse. Amplitude and rate of rise
of inverse voltage contribute greatly to tube dissipation and
electrode damage; if these are not minimised in the circuit,
tube life will be shortened considerably. The aim should be
for an inverse voltage of 3 – 5 kV peak with a rise time of
0.5
ms.
6. This rate of rise refers to that part of the leading edge of
the pulse between 10% and 90% of the pulse amplitude.
7. For applications requiring the highest rate of rise of anode
current, grid 1 should be pulse driven. Maximum grid drives
should be used, the rate of rise of grid 2 trigger pulse
should be as high as possible and the grid 2 pulse delay
should be 0.2
ms
min.
For less severe applications, good results can be obtained
by driving both grids from a single pulse using the circuit
shown in Fig. 1.
1.0 kV
5502A
Grid 2 (See note 7)
Unloaded grid 2 drive pulse
(see note 8) . . . .
Grid 2 pulse duration . .
Rate of rise of grid 2 pulse
(see note 6) . . . .
Grid 2 pulse delay . . .
Peak inverse grid 2 voltage
Loaded grid 2 bias voltage
Forward impedance of
grid 2 drive circuit . .
voltage
. . . . 600
. . . . . 0.5
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
2000
–
V
ms
. 1.0
–
kV/ms
. 0
3.0
ms
. –
450
V
750 7200
V
50
200
O
. . . .
Grid 1 – Pulsed (See note 7)
Peak grid 1 drive current
Unloaded grid 1 drive pulse
(see note 8) . . . .
Grid 1 pulse duration . .
Rate of rise of grid 1 pulse
(see note 6) . . . .
Peak inverse grid 1 voltage
Loaded grid 1 bias voltage
. . . . . 0.3
voltage
. . . . 300
. . . . . 1.0
1.0
2000
–
A
V
ms
. . . . . 1.0
–
kV/ms
. . . . . –
450
V
. . . . . . . . see note 10
Grid 1 – DC Primed (See note 9)
DC grid 1 unloaded priming voltage .
DC grid 1 priming current . . . .
75
50
150
100
V
mA
100
O
GRID 2
Cathode
Heater voltage . . . . . . . . .
Tube heating time . . . . . . . .
6.3
+
5%
5.0
–
V
min
0.5
ms
0.1
mF
1.0 kO
GRID 1
Environmental
Ambient temperature . . . . . .
750
Altitude . . . . . . . . . . . –
–
+90
3
10 000
8C
km
ft
10 kO
CATHODE
CHARACTERISTICS
Min Typical Max
Critical DC anode voltage for
conduction (see note 11) .
Anode delay time
(see notes 11 and 12) . .
Anode delay time drift
(see notes 11 and 13) . .
Time jitter (see note 11) . .
Heater current (at 6.3 V)
.
. . –
. . –
. . –
. . –
.
18
0.5
0.15
20
1.0
22
2.0
0.25
50
5.0
25
kV
ms
ns
ns
A
Fig. 1 Circuit for single pulse drive
8. Measured with respect to cathode. When grid 1 is pulse
driven, the last 0.25
ms
of the top of the grid 1 pulse must
overlap the corresponding first 0.25
ms
of the top of the
delayed grid 2 pulse.
9. When DC priming is used on grid 1, a negative bias of 100 V
to 200 V must be applied to grid 2 to ensure anode voltage
hold-off.
10. DC negative bias voltages must not be applied to grid 1.
The potential of grid 1 may vary between
710
V and +5 V
with respect to cathode potential during the period
between the completion of recovery and the
commencement of the succeeding grid pulse.
11. Typical figures are obtained on test using conditions of
minimum grid drive. Improved performance can be
expected by increasing grid drive.
12. The time interval between the instant at which the rising
unloaded grid 2 pulse reaches 25% of its pulse amplitude
and the instant when anode conduction takes place.
13. The drift in delay time over a period from 10 seconds to
10 minutes after reaching full voltage.
CX1622, page 2
#E2V
Technologies
OUTLINE
(All dimensions without limits are nominal)
4900B
1K
Ref
A
B
C
D
E
F
G
H
J
K
L
Millimetres
304.8 max
84.12 max
215.9
+
13.0
111.1
95.25
1.6
6.5
381.0
6.35
14.38
+
0.18
12.70 min
Inches
12.000 max
3.312 max
8.500
+
0.512
4.375
3.750
0.063
0.256
15.000
0.250
0.566
+
0.007
0.500 min
L
1B
A
Inch dimensions have been derived from millimetres.
C
Outline Notes
1. The recommended hole in the mounting plate is
76 mm (3.0 inches) diameter.
2. A minimum clearance of 44.45 mm (1.750 inches)
must be allowed below the mounting surface.
3. The mounting flange is the cathode connection,
and this is connected internally to the mid-point
of the heater.
SEE NOTE 3
F
SEE NOTE 1
SEE NOTE 2
GRID 1 LEAD (GREEN)
H LONG, TAG TO SUIT
1J
3 HOLES
1G
EQUISPACED ON E PCD
GRID 2 LEAD (WHITE)
H LONG, TAG TO SUIT
1J
1D
CATHODE HEATER LEADS (YELLOW)
H LONG, TAGS TO SUIT
1J
#E2V
Technologies
CX1622, page 3
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.
Whilst E2V Technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use
thereof and also reserves the right to change the specification of goods without notice. E2V Technologies accepts no liability beyond that set out in its standard
conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.
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