Operation
2
Keysight 478A Operating and Service Manual
21
Figure 2-3
Maximum Power Meter Reading vs Square and Sine-Wave
Frequency
When RF is switched by pulse-gating (coaxial solid state switches), consideration
must be given to the RF energy contained in the switching pulse itself. This energy
must be added to actual RF pulse power when estimating the RF power
dissipated in the thermistor mount. PIN diode modulators of Keysight model
8741A/8716A modulators and 8614A/8616A signal generators, however, are not
subject to this consideration because output filtering prevents transmission of
modulating signals.
CAUTION
Thermistors are inherently temeperature-sensitive devices. A cold thermistor
mount connected to a warm piece of equipment, or vice versa, produces
rapid shift. FOR MINIMUM DRIFT ON SENSITIVE RANGES, MAKE SURE THAT
THE MOUNT AND THE EQUIPMENT CONNECTED TO IT ARE AT NEARLY THE
SAME TEMPERATURE BEFORE MAKING A MEASUREMENT.
Содержание 478A
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Страница 45: ...Keysight 478A Thermistor Mount Operating and Service Manual 45 A Appendix A Introduction 46 Manual Changes 47...