Keysight Technologies 8490D Operating And Service Manual

Contents

Keysight Technologies 8490D Operating And Service Manual Manual pdf 22 page image

1 Operating Instruction22 Keysight 849x and 1158x Operating and Service ManualOperating InstructionOperator’s checkThe operator's check is supplied to allow the operator to make a quick check ofthe attenuators prior to use or if a failure is suspected.Using oscillator and SWR meterDescriptionThe attenuator is driven from a 50-ohm signal source at 1 kHz. The output levelfrom the attenuator is detected by a narrow-bandwidth voltmeter (that is, theSWR meter). A reference level is set up on the detector using a throughconnection in place of the attenuator. The attenuator is then inserted and thechange in the detector level is noted. This checks the low frequency accuracy ofthe attenuator.Quick-check procedure1 Connect the equipment as shown in the Figure 1 except remove the attenuatorand connect the adapters directly together.Figure 1 Equipment setup using oscillator and SWR meter2 Set the test oscillator to 0.3 Vrms at 1 kHz.NOTE The SWR meter used in this check is calibrated for a square-law detector andtherefore the range changes and errors (read in dB) are twice that indicated bythe meter.