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Figure 5-2. Pulsed Accuracy for Thermocouple Sensors

5-2 Pulsed RF Operation Thermocouple Sensors

Figure 5-2 shows the regions of valid duty cycle and pulse power that apply to the

Thermal Sensors. As the duty cycle decreases, the average power decreases for a

given pulse power and the noise becomes a limitation. Also, there is a pulse power

overload limitation. No matter how short the duty cycle is, this overload limitation

applies. Lastly, the average power cannot be exceeded (there is some headroom between

the measurement limitation and the burnout level of the sensor).

Since the detection process in Thermal Sensors is heat, Thermal Sensors can handle

pulse powers that are two orders of a magnitude larger than their maximum average

power. This makes them ideal for this application. The minimum pulse repetition

frequency for the Thermal Sensors is approximately 100 Hz.

Power Sensor Manual 31

-30

.01 .1 1 10 100

Duty Cycle (%)

Pulse Power (dBm)

-10

-20

.001

Operation in this

region not valid

Valid

measurement

region

RMS Noise = 100 nW @ 4.8 sec filter

<0.1 dB

<0.3 dB

<0.2 dB

Average

overload

limitation

(300mW)

Upper

measurement

limitation

(100mW Avg Power)

Notes:

For 51200 and 51300 sensors,

add 20 dB to vertical axis. For

51201 and 51301 sensors, add

24 dB to vertical axis.

These accuracy figures are to

be added to the standard CW

accuracy figures.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 51 52

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