1. Scale Power Measurement Pengcheng Jia Nov 21, 2002

2. System Setup LabView Program Power Supply Agilent 3631 Power Supply KEPCO Signal Source Wiltron 68001 TWTA Power Meter HP438A Coupl er #1 Power Sensor A Agilent 8485A DUT Coupl er #2 Attenuator 20dB / 100 Watt Spectrum Analyzer HP8563 Power Sensor B Agilent 8481B Gate Bias Drain Bias 8 Channel Supply for 32 MMICs

3. Control Program

4. Calibration Procedure

5. Power Meter & Power Sensor Calibration of power meter (for 438A) 1.Press Zero 2.Connect power sensor to POWER REF port, press Cal Adj, enter the Ref CF number on your power sensor 3.Press Cal Factor, enter the CF number at your frequency Note: When calibrate with high power sensor 8481B, remove the 30 dB attenuator, then connect to Power Ref port

6. Kepco RA55 Power Supply Use PC’s program to control 8 channel all together Use Kepco’s program to control one channel at one time Always set current limit to protect your system Up to 15V, 12A each channel

7. TWT Wait for warm up Gain is adjustable, very high gain(40-50 dB), Watch out your system’s limitation Always connect with load at output port before turn the RF output on Let’s standby and cool down several minutes before turn the power off

8. Tips for WinCal Key WinCal License Key We use a parallel port hub to connect the license key with 3 computers and 1 printer. The key and the printer is on the top port of the Hub. You can switch it to different computers by pressing the button at the lower part. Always connect the printer and make sure the printer is working fine. Otherwise the key may not be seen by the computers.

9. Tip for 85108A The 85108A test set has an option H11. This option support 2 bands: 1-20GHz or 6-50GHz. It can’t work continuously from 1 to 50Ghz. It means if you measure from 1 to say 30 GHz. The result will be very strange. Always load the configuration disk when you change the band. Press Disc->Load->more->Machine Dump->select your band(NP for normal non-pulse measurement)->Load file