MAXIMUM AND MINIMUM RATINGS
These ratings cannot necessarily be used simultaneously, and
no individual rating must be exceeded.
Min
Typical Max
Anode (Pulse Modulator Service)
Peak forward anode voltage
(see note 3)
....... –
–
40
kV
Peak inverse anode voltage
(see note 4)
....... –
–
35
kV
Peak anode current
..... –
6.0
–
kA
Peak anode current (pulse
repetition rate limited
to 60 pps max) ...... –
–
8.0
kA
Average anode current
.... –
–
4.0
A
Rate of rise of anode current
(see notes 5 and 6) ..... –
10
–
kA/
ms
Pulse repetition rate
(see note 7)
....... –
400
–
pps
Min
Max
Anode (Single Shot, see note 8)
DC forward anode voltage .....
–
30
kV
Peak anode current
.......
–
40
kA
Rate of rise of anode current
.......
see note 5
Total conducted charge:
capacitor discharge
......
–
0.4
C
power supply follow-on
.....
–
18
C
Repetition frequency ....... 1 pulse per 10 s max
Grid 2
Unloaded grid 2 drive pulse voltage
(see note 9)
........
500
2000
V
Grid 2 pulse duration .......
0.5
–
ms
Rate of rise of grid 2 pulse
(see note 6)
........
10
–
kV/
ms
Grid 2 pulse delay ........
0.5
3.0
ms
Peak inverse grid 2 voltage .....
–
450
V
Loaded grid 2 bias voltage ....
750
7180
V
Forward impedance of
grid 2 drive circuit ......
50
500
O
Grid 1 – Pulsed
Unloaded grid 1 drive pulse voltage
(see note 9)
........
400
1000
V
Grid 1 pulse duration .......
2.0
–
ms
Rate of rise of grid 1 pulse
(see note 6)
.........
1.0
–
kV/
ms
Peak inverse grid 1 voltage .....
–
450
V
Loaded grid 1 bias voltage ........ see note 10
Peak grid 1 drive current
.....
0.5
1.5
A
Grid 1 – DC Primed (See note 11)
DC grid 1 unloaded priming voltage .
75
150
V
DC grid 1 priming current
....
75
150
mA
Cathode
Heater voltage .........
6.3
+ 0.3
V
7 0.0
Heating time
........
15
–
min
Reservoir
Heater voltage (see note 1) .....
4.5
6.5
V
Heating time
........
15
–
min
Environmental
Ambient temperature ......
750
+90
8C
Altitude
...........
–
3
km
–
10 000
ft
CHARACTERISTICS
Min
Typical Max
Critical DC anode voltage for
conduction (see note 12) .
.
. –
0.5
1.0
kV
Anode delay time
(see notes 12 and 13) .... –
0.1
0.25
ms
Anode delay time drift
(see notes 12 and 14) .... –
15
50
ns
Time jitter (see note 12) .... –
1.0
5.0
ns
Recovery time ............
see note 7
Cathode heater current
(at 6.3 V) .......
35
40
45
A
Reservoir heater current
(at 5.0 V) ........ 8.0
10
12
A
NOTES
1. The reservoir heater must be decoupled with a suitable
capacitor to avoid damage by spike voltages. The
recommended reservoir heater voltage for each individual
tube is stamped on the tube envelope. This recommended
value is determined for hold-off at the maximum anode
voltage under DC conditions. For lower voltages and
modulator operation the reservoir heater voltage should be
increased to a value consistent with voltage hold-off at the
operating level. Maximum reservoir voltage (i.e. maximum
gas pressure in the tube) is one prerequisite for maximum
thyratron life. The reservoir voltage should be stabilised to
+ 0.05 V.
2. The tube must be mounted by means of its mounting
flange.
3. Under resonant charging conditions a maximum anode
voltage of 35 kV is recommended. Using command
charging techniques, where the voltage appears at the
anode for only a short time (
51 ms), this thyratron may be
operated at up to 40 kV.
4. The peak inverse voltage including spike 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
3–5kV peak with a rise time of 0.5
ms.
5. For single-shot or burst mode applications this parameter
can exceed 150 kA/
ms. The ultimate value which can be
attained depends to a large extent upon the external
circuit.
6. This rate of rise refers to that part of the leading edge of
the pulse between 25% and 75% of the pulse amplitude.
7. This thyratron has a long recovery time (50 – 100
ms). The
amount of time available for thyratron recovery must be
maximised by circuit design, and reliable operation may
necessitate the use of command charging techniques. The
amount of time required for recovery is affected by gas
pressure, peak current, pulse duration and load mismatch
which keeps the thyratron in a conducting state.
CX1174, page 2
#
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