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2.2.8 Frequency response compensation
Perform Frequency response compensation, when one of the following modules is replaced. This Frequency response
compensation is not necessary, if the module you replaced does not belong to the following modules.
• A03 CPU • 21GHz S-ATT
• 3GHz CONVERTER • 21GHz YTF/SW
• A13 MICRO CONVERTER • H. MIXER
• A14 1st LO AMP
Frequency response caused by front-end components such as step attenuator, low pass filter and mixer is corrected by
measuring the response and storing the data in instrument’s memory.
Frequency response compensation process consists of four steps that are performed semi-automatically with “Frequency
Response Compensation” software. The four steps are as follows :
1. DUT (Device Under Test) check,
2. Signal source power output calibration with power meter,
3. Frequency response measurement using the calibrated power output,
4. Compensation data updating.
Required instrument :
(1) 6769B Swept Frequency Synthesizer
(2) MG3633A Synthesized Signal Generator
(3) two ML4803A Power Meters
(4) MA4705A Power Sensor
(5) MA4601A Power Sensor
(6) two 3 dB attenuators
(7) IBM-PC/AT compatible for controller
(8) GPIB-PC2/2A
(9) ML2437A Power Meter (for MS2667C and MS2668C)
(10) MA2444A Power Meter (for MS2667C and MS2668C)
Required software :
(1) MS-DOS Ver. 5.0 or later and Windows 3.1, or Windows 95
(2) Frequency Response Compensation software.
2.2 Troubleshooting
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