The H75 and H76 are options for the 478A that represent optimized performance for VSWR
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Agilent 478A Coaxial Thermistor Mount
The Hp 478A Coaxial Thermistor Mount is designed for use with the HP Model 431 and 432 Power Meters to measure microwave power from 1 μW to 10
mW. Design of the mount minimizes adverse effects from enviromental temperature changes during measurement. For Increased measurement accuracy,
Effective Efficiency and Calibration Factor are measured for each mount, and at selected frequencies across the operating range; the results are
marked on the label of the instrument.
Features:
- High accuracy even in routine power measurements
- Temperature compensated for low drift
- Measures microwave power as low as one microwatt
- Shows calibration factor and effective efficiency at 12 frequencies
- Frequency Range: 10 MHz to 10 GHz
- Maximum SWR: 10 MHz to 25 MHz 1.75; 25 MHz to 7GHz 1.30; 7 GHz to 10 GHz 1.50
- Available options: 478A-H75 and 478A-H76 for frequency range 1 MHz to 1 GHz (Max. SWR 1.3, 1.05 at 50 MHz). 478A-H76 provides standard lab
calibration at 50 MHz
Specifications:
| Frequency Range |
10 MHz to 10 GHz |
| Mount Calibration |
Calibration Factor and Effective Efficiency furnished at six frequencies
between 10 Mhz and 10 GHz |
| Impedance |
50 ohms |
| Maximum Reflection Coefficient |
10 to 25 MHz |
0.273 (1.75 SWR, 11.3 dB return loss) |
| 25 MHz to 7 GHz |
0.13 (1.3 SWR, 17.7 dB return loss) |
| 7 to 10 GHz |
0.2 (1.5 SWR, 14 dB return loss) |
| Operating Resistance |
200 ohms |
| Power Range |
1 μW to 10 mW |
| Maximum Peak Power |
200W |
| Maximum Average Power |
30 mW |
| Maximum Energy per Puls |
10W • μs for a PRF ≥1HHz
5 W • μs for a PRF kHz |
| Elements |
Field-replaceable, thermally balanced thermistor assembly
Thermistor assembly field adjustable so that full "zero-set" capability can be restored in the event
inadvertent overload (mount calibration no longer valid) |
| RF Connector |
Type -N male, compatible with female connectors whose dimensions conform to MIL-C- 71
or MIL-C-39012. Brass connector. |
| Output Connector |
Mates with 431 and 432 cables. |
| weight |
net, 5 0z (140 g)
Shipping, 1lb (450 g) |
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