CX1174 ETC, CX1174 Datasheet - Page 3

• Manufacturer Part Number: CX1174
• Description: Deuterium-Filled Ceramic Thyratron
• Manufacturer: ETC

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10. DC negative bias voltages must not be applied to grid 1.
SCHEMATIC DIAGRAM
RECOMMENDED GRID, CATHODE AND RESERVOIR HEATER CONNECTIONS
R
R
C
Components R
# E2V Technologies
4
6890A
8. Under fault conditions most of the coulombs are often in
9. Measured with respect to cathode. Pre-pulsing of grid 1 is
1
2
1
, C
C
C
the power supply follow-on current, rather than the storage
capacitor discharge.
recommended for modulator and high rate of rise
applications. 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.
When grid 1 is pulse driven, the potential of grid 1 may
vary between 710 and +5 V with respect to cathode
potential during the period between the completion of
recovery and the commencement of the succeeding grid
pulse.
RESERVOIR
(VARIABLE)
2
1
2
CATHODE
HEATER
SUPPLY
HEATER
SUPPLY
=
=
7
=
=
Grid 1 series resistor. 12 W vitreous enamelled wirewound is recommended, of a total impedance to match the grid 1
drive pulse circuit.
Grid 2 series resistor. 12 W vitreous enamelled wirewound is recommended, of an impedance to match the grid 2 drive
pulse circuit.
reservoir protection capacitors with a voltage rating 5500 V;
1000 pF low inductance (e.g. ceramic),
1 mF (e.g. polycarbonate or polypropylene).
1
, R
2
, C
C
C
1
1
2
and C
G1
G2
2
should be mounted as close to the tube as possible.
R
R
2
1
GRID 2 DELAYED
WITH RESPECT TO GRID 1
0.5 ms MIN
GRID 1/GRID 2 DELAY
11. When DC priming is used on grid 1, a negative bias of 100
12. Typical figures are obtained on test using conditions of
13. The time interval between the instant at which the rising
14. The drift in delay time over a period from 10 seconds to
GRID 2 VOLTAGE
500 – 2000 V,
1 ms
0
to 180 V must be applied to grid 2 to ensure anode voltage
hold-off. Also the higher grid 1 is pulsed, the larger the grid
2 negative bias must be to prevent the tube firing on the
grid 1 pulse.
minimum grid drive. Improved performance can be
expected by increasing grid drive.
unloaded grid 2 pulse reaches 25% of its pulse amplitude
and the instant when anode conduction takes places.
10 minutes after reaching full voltage.
NEGATIVE BIAS VOLTAGE
GRID 1 CURRENT
0.5 – 1.5 A,
2 ms
CX1174, page 3