Bird Model 43 Wattmeter
36
Rectangular Pulses
When measuring rectangular pulse power, note the following signal
requirements:
y Duty Cycle: 2%, minimum
y Rep. Rate: 100 pps, minimum
y Pulse Width: 200 µs, minimum
Peak Calibration
If recalibration is required, refer to figure 15 and these instructions:
1. Unscrew the four 8-32 flat head screws securing the back cover.
2. Grasp the back cover by the side tabs behind the line connectors
and pull straight back to remove it.
3. Insert the Bird 43P between a reliable CW signal source and a 50
ohm load.
4. Insert an element with the appropriate power and frequency
range into the Bird 43P. Turn it to read forward power.
5. Set the wattmeter to CW mode (LED off).
6. Turn on the signal source and adjust the source power to give a
stable reading in the upper half of the wattmeter’s scale.
7. Switch the wattmeter to PEAK mode (LED on).
8. Adjust the potentiometer (R9) until the PEAK reading is the same
as the CW reading.
9. Replace the back cover.
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