2
Operation
20
Keysight 478A Operating and Service Manual
Pulse Energy and Peak Power for 478A/431 Combination
The limitations of this combination are basically the same as the 487A/432 with
the exception that at pulse repetition rates less than 1 kHz, energy per pulse must
not exceed 5 W-
μ
s and peak power must not exceed 10 mW. These limits are also
interpreted in
.
Square-wave modulation is a special case of pulse modulation, and maximum
power-meter reading versus square-wave frequency is illustrated in
.
This figure also holds for sine-wave modulation.
In the discussions above, the primary consideration is maximum power or energy.
However, for modulation frequencies less than 100 Hz, the low repetition
frequency itself causes errors in indicated power. These errors may be as large as
two percent regardless of range or reading.
Figure 2-2
Maximum Power Meter Reading vs Duty Cycle for Pulses Longer
than 250
μ
s
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...