TYPE A
High Power Non-Reactive Cermet Resistors
WATER COOLED
- Wide resistance range
- Power ratings to 300kW* (up to 1,000 watts per square inch)
- Extremely durable
- Very low TCR: 100 ppm typical
- Very stable: less than .4% change after 10 hours at rated power
- Resistor is directly cooled by water (I.D. and O.D.)
- Typical VSWR 1.1 to 1*
- Low cost alumina substrate: power dissipation exceeds resistors built on BeO substrate and cooled from one side
- Used by most water cooled RF termination manufacturers.
* In a properly designed system with proper water flow. Consult factory
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Max. size 4.0″ OD x 40″ Long
Dimensions (Inches) |
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Type No.
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Rated Power (Watts)**
|
A
|
B
|
C
|
D
|
|
PFS 5
|
5,000
|
.500
|
.375
|
5.00
|
.375
|
|
PFS 7.5
|
10,000
|
.875
|
.500
|
7.625
|
.625
|
|
PFS 12
|
50,000
|
1.1
|
.500
|
12.00
|
.875
|
|
PFS 34
|
100,000
|
1.1
|
.500
|
34.00
|
.875
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TYPE CP
High Power Non-Reactive Cermet Resistors
AIR COOLED
- Standard size 10 watts to 1,000 watts in static air
- VERY HIGH POWER DISSIPATION
- Wide resistance range: 1 ohm to 20 meg ohms
- High stability
- Low TCR: less than 300 ppm typical
- Superior terminals: platinum/silver offers much lower contact resistance than nickel or aluminum
- Excellent moisture resistance
- Excellent RF characteristics
- May be used in place of other types of resistors
- Close tolerances available
| Watts at 40°C Derated to Zero Ambient* at 350°C |
Standard Sizes (Other Sizes Available)
Max. Size 4.0″ OD x 40″ Long Dimensions (Inches) |
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Type No.
|
Rated Power (Watts)**
|
A
|
B
|
C
|
D
|
|
PFS 1.75
|
10
|
.500
|
.250
|
1.75
|
.250
|
|
PFS 2
|
20
|
.500
|
.250
|
2.00
|
.250
|
|
PFS 2.5
|
30
|
.750
|
.500
|
2.50
|
.250
|
|
PFS 5
|
60
|
.750
|
.500
|
5.00
|
.500
|
|
PFS 6
|
100
|
1.0
|
.750
|
6.00
|
.750
|
|
PFS 8
|
150
|
1.0
|
.750
|
8.00
|
.750
|
|
PFS 12
|
300
|
1.0
|
.750
|
12.00
|
.750
|
|
PFS 18
|
500
|
1.0
|
1.0
|
18.00
|
.750
|
|
PFS 18
|
750
|
2.0
|
1.0
|
18.00
|
1.75
|
|
PFS 24
|
1000
|
2.0
|
1.0
|
24.00
|
1.75
|
TYPE A1
High Power Non-Reactive Cermet Resistors
INTERNAL WATER COOLED
- Convenient hose connections
- Custom design to application
- Small size
- Call for application
|
Dimensions (Inches)
|
|||||
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Type No.
|
Rated Power (Watts)**
|
A
|
B
|
C
|
D
|
|
PFS 5
|
325
|
.500
|
.500
|
5.00
|
.375
|
|
PFS 6
|
800
|
1.0
|
.750
|
6.00
|
.750
|
|
PFS 8
|
1067
|
1.0
|
.750
|
8.00
|
.750
|
|
PFS10
|
1200
|
1.0
|
.750
|
10.00
|
.750
|
TYPE O
Non-Reactive Cermet Resistors
OIL COOLED
- Call for application
|
Dimensions (Inches)
|
|||||
|
Type No.
|
Rated Power (Watts)**
|
A
|
B
|
C
|
D
|
|
PFS 10
|
50w/in2
|
.500
|
.375
|
10.00
|
.375
|
|
PFS 17.25
|
50w/in2
|
.625
|
.375
|
17.25
|
.500
|
TYPICAL SPECIFICATIONS
|
Type A
|
Type A1
|
Type O
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Type CP
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|
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Resistance Range
|
1ohm-20meg ohms
|
Same
|
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Tolerances
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20%-10%-5%-2%-1%
|
Same
|
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Load Life
|
Max. 5% change after 1000hrs at rated load
|
Same
|
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Short Time Overload (10 times rated. Power 5 seconds on -90 seconds off)
|
2% change
|
Same
|
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Temperature Coefficient (per degree C)
|
300 ppm Max.
|
Same
|
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Voltage Coefficient
|
Max. 1%-KV/IN
|
Same
|
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|
Maximum Operating Temperature
|
90°C+
|
<100°C+
|
++
|
350°C*
|
|
Moisture Resistance
|
2.5% change Mil Std 202B, Method 103
|
Same
|
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Standard Metalization
|
Pt/Ag (Au/Pt. Pd/Ag optional)
|
Same
|
+Cavitation begins at 90oC disrupting water flow.
++Maximum operating temperature Mineral Oil 125oC/Silicon Oil 250oC
Typical VSWR Most Applications Obtain 1.1 to 1
