Scale Power Measurement

Pengcheng JiaNov 21, 2002

System Setup

LabView Program

Power SupplyAgilent 3631

Power SupplyKEPCO

Signal SourceWiltron 68001

TWTA

Power MeterHP438A

Coupler #1

Power Sensor AAgilent 8485A

DUT

Coupler #2

Attenuator20dB / 100 Watt

Spectrum AnalyzerHP8563

Power Sensor BAgilent 8481B

GateBias

DrainBias

8 Channel Supplyfor 32 MMICs

Control Program

Calibration Procedure

Coupler #1

Power Sensor A

Power Sensor B

(a)

SMA to N Adapter

Coupler #1

Power Sensor A Power Sensor B

(b)

SMA to N Adapter

Attenuator 20dB / 100 Watt

Coupler #2

Spectrum Analyzer

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

Kepco RA55 Power Supply

                       

KEPCO 8 Channel Power SupplyKEPCO 8 Channel 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

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

Tips for WinCal Key WinCal License KeyWe 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.

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