Name: E1549, CX1549 thyratrons, EECTECH 35KV thyratrons, Equivalent to E2V CX1549
Brand: China industrial electronic components
SKU: ETH04023
Availability: InStock

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Description
Reviews

Application：
thyratrons are widely used in scientific research,medical treatment and industry such fields,which include laser instruments,radar,pulse modulator,medical linear accelerator,tommy bar protection and other electric instruments and equipments.

Anode Characteristics
Peak Forward Anode Voltage: 35kV max[1]
Peak Anode Voltage: 10kV [2]
Peak Forward Anode Current: 0 kA max
Average Anode Current: 15 A max
Anode Current Rate of Rise: 10kA/μs max[3]

Grid 2 Pulse Parameters
Unloaded Pulse Voltage: 1000V~2000V
Peak Drive Pulse Current: 5A ~ 40A
Rate of rise of Pulse: 10kV/μs min [3]
Pulse Duration: 1μs min
Negative bias Voltage: -50V ~ -200 V[4]
Pulse Delay: 0.5μs ~ 3μs
Peak Inverse Voltage: 450V max

Grid 1 Pulse Parameters
Unloaded Pulse Voltage: 600V ~ 2000V [5]
Drive Current: 5A ~ 40A
Pulse Duration: 2μs min
Rate of rise of Pulse: 1kV/μs min [3]
Peak Inverse Voltage: 450V max

Electrical
Cathode Heater Voltage: 6.3±5%V[6]
Cathode Heater Current (6.3V): 80A ~ 100A
Reservoir heating Voltage: 6.3±5%V [7]
Reservoir heating Current (6.3V): 7A ~ 9A
Preheating Time: 10 min

Mechanical
Outline and Dimension: See outline drawing
Net weight: About 10 kg
Mounting Position: Flange [8]
Cooling Way: Forced air cooling[9]

Characteristics
Critical anode voltage for conduction: 2.0 kV max
Anode Delay Time Firing: 350ns max [10]
Anode Delay Time Drift: 50ns max [11]
Time Jitter: 10ns max[12]

Environmental
Ambient Temperature: 0℃ ~ 40℃

Notes：
[1] The maximum anode forward voltage of the thyratron start instantaneously is 30KV cannot be
exceeded.
[2] Peak inverse anode voltage (include peak) must not exceed 10KV within 25 μs after impulse
current discharge finished, otherwise it will damage the grid and cause spark inside the tube and
shorten the working life.
[3] This rate of rise refers to that part of the leading edge of the pulse between 25% and 75% of the
pulse amplitude.
[4] The higher grid 1 is pulsed, the larger must the grid 2 negative bias be, to prevent the tube firing on
the grid 1 pulse.
[5] Measured with respect to cathode potential. Pulsing triggering of grid 1 is recommended for longer
life time and fewer grid fires
[6] Using the separate power supply is recommended for cathode heating and reservoir
heating. Special note: the yellow lead is the common end of both loops (the cathode flange is not the
heating common end). If the cathode flange is mistakenly energized as a common end, then will
caused irreversible damage to the thyratron. To avoid overcurrent damage of reservoir heater
wire by the peak voltage coupling, can parallel connect a 1 μF and a 1000pF non-inductive capacitor
in the circuit, as shown in the figure below.
If the cathode and the reservoir are heated by one power supply, the red line of the
reservoir can be connected to the cathode flange

[7] The heating voltage of the reservoir can be adjusted within the specified range, so that
the air pressure in the tube can be increased to the value that the required anode voltage can
withstand.
[8] Thyratron must be installed with a flange and the other electrodes connected with a soft wire. The
preferred direction is the vertical anode upward method; do not use the anode downward method.
[9] Adopt air cooling device for cooling, the below figure 2 type of cylinder air duct is preferred, and required the flow rate of a single fan shall not be less than 7.08m3/min.

[10] Anode firing delay time, the time interval between the instant at which the rising unloaded grid 2
pulse reaches 26% of its pulse amplitude and the instant when anode conduction takes place.
[11] Anode firing delay time drift, the drift in delay time over a period from 10 seconds to 10 minutes
after reaching full voltage, its anode firing delays time of change
[12] To get a short time jitter, the cathode can be heated by a DC power supply and triggered by a
double pulse, and the pulse voltage leading edge rise rate of G2 exceeds 20kV/ s.

Grid Electrodes Connection Schematic Diagram
Using two trigger pulses and a negative bias, this connection is beneficial to the cathode to get the long life.

R1 = 12W wire-wound resistance, matches with G2 drive current;
R2 = 12W wire-wound resistance, matches with G1 drive current;

OUTLINE:

For delivery time:
Generally, we will dispatch the items within 10 days upon order confirmation; some items may need 20~30 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.

For Bulk order:
If you would like to place a bulk order, please contact us for better price and better delivery cost.