PM4 VDI太赫兹频段功率计(75GHz-2THz)

加工定制	否	类型	智能功率测量仪表
品Pai	VDI	型号	PM4

Specifications:Input is WR10 waveguide (1.25 x 2.5 mm) with UG387 precision flange. Useful frequency response is 75 GHz through thesubmillimeter range, extending even to the visible.Sensor size is 5.1 x 4.8 x 7.6 cm. 1 m cable connects to readout.1KO heater resistor (on the RF load) is used for DC calibration. Internal calibration check on all ranges..Maximum VSWR <1.15:1 in 80-110 GHz band.Input loss is <0.15 dB at 90 GHz.41/2 digit LED panel meter readout, with 4 power ranges. Maximum input power is 200 mW average.Analog output BNC connector on back panel: 0-10V corresponds to 0-full scale meter reading.RS232 data output port.Calibration factor adjustment of up to ±29.9 dB using digi switches.Temperature drift is compensated to <2 µW/°C.The sensor has a thermal time constant (1/e) of 6 seconds. For faster response, the load is heated to a nearly constanttemperature using a feedback loop. When input power is applied, the heater power is reduced, and the circuit measures thechange, which is equivalent to the input power. The loop gain varies with the power to be measured, changing the responsetime. For highest sensitivity, no feedback is used on the lowest scale.Typical performance

Scale (FS)	time for 90% response*	RMS noise
200 mW	0.1 s	~3 µW
20 mW	0.15 s	~0.3 µW
2 mW	1.3 s	0.1 µW
200 µW	15 s	0.01 µW

*Response time is given as the time from application of an input to a response at the analog output of 90% of the final reading. RMS noise is in the meter reading, with a maximum meter update rate of 3 Hz.

Vertical scale 6 µW/div, horizontal 2.5 s/div.	Vertical scale 200 µW/div, horizontal .5 s/div.
The figures above show the actual response (from analog output) to a 34 µW input on the 2 mW scale (left) and a 1 mW input on the 20 mW scale (right).Changing scales causes a large thermal transient due to the change in bias heat. Switching scales to a lower power (200 mW to 200 µW) requires 15 min for stabilization. Settling time is 2 min when switching scales upward. The 5 digit display, and the very low noise and high stability, eliminate the need to change scales in most measurements.Operational temperature range 10-30 °C.Required power 90-240 V 50-60 Hz.