478A Coaxial Thermistor Mount is designed for use with the HP Model 431 and 432 Power Meters
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HP / Agilent 432A Thermistor Power Meter
The Hewlett-Packard Model 432A Power Meter, with HP temperature-compensated thermistor mounts, measures RF power from 10 microwatts (-20 dBm) to
10 milliwatts (+10 dBm) full scale with 1% of full scale accuracy from 10 MHz to 40 GHz. With a selector switch, the instrument normalizes the
power meter reading to compensate for the Callibration Factor of a thermistor mount used for a given measurement. For portable operation, Option 01
instruments have a rechargeable nickel-cadmium battery.
Specifications:
Power Range |
Seven ranges with full-scale readings of 10, 30, 100, and 300 μW, 1, 3, and 10
mW; also calibrated in dBm from -20 dBm to + 10 dBm full scale in 5 dB steps. |
| Noise |
less than 0.25% of full scale peak (typical) |
| Response Time |
at recorder output, 35 ms time constant (typical). |
| Fine zero |
automatic, operated by front panel switch |
| Zero Carry over |
less than 0.50% of full scale when zeroed on most sensitive range. |
| Meter |
taut-band suspension, individually calibrated, mirrorbacked scales. Milliwatt scale more than
108 mm (4.25 in) long. |
| Calibration factor control |
13- position switch normalizes meter reading to account for thermistor sensor calibration
factor. Range 100% to 88% in 1% steps. |
| Thermistor sensor |
thermistor sensors are required for operation of HP 432A/B |
| Recorder output |
proportional in indicated power with 1 volt corresponding to full scale. 1 kΩ output impedance. |
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