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Keysight Technologies
Measuring High Voltages using the
U8903A Audio Analyzer




        Application Note




                      This note shows how the U8903A-109 BNC
                      accessory kit can be used to make an
                      attenuator that will extend the input voltage
                      range of the U8903A to 300 vRMS.
02 | Keysight | Measuring High Voltages using the U8903A Audio Analyzer - Application Note


       The U8903A Audio Analyzer can measure a maximum of 140 vRMS on the
       unbalanced BNC connection. This is more than adequate for most applications but
       some situations do need to extend beyond this limit.

       This note shows how the U8903A-109 BNC accessory kit can be used to make an
       attenuator that will extend the input voltage range of the U8903A to 300 vRMS. An
       example is shown in Figure 1.




       Attenuator
       Attenuation can be achieved in many ways depending on the requirements. For this
       application there are two main requirements. The first is that that attenuator must
       have a high input impedance otherwise power dissipation and voltage drop will
       be too high. The second requirement is that the attenuator must have low output
       impedance so that it does not from a low pass filter with the input capacitance of
       the U8903A.

       The `L' type attenuator is best suited to this application and the schematic is shown
       in Figure 2.




       Input
                       100 kOhms

                         3.3 kOhms                  100 kOhms        100 pF



                      Attenuator                      U8903A

       Figure 2.



       The requirement for high input impedance and low output impedance mean that
       the attenuator will naturally be of high value, the values shown result in attenuation
       value of a little over 30 dB.


       Component Choice
       The 100 k resistor will be dissipating 0.85 W with a 300 vRMS input. A 1 W metal
       film 1% tolerance device is the best choice here. For the 3.3 k resistor power is not
       such an issue but physical size is important. A 0.125 W metal film 1% tolerance
       device is most suitable. The 100 k resistor in this particular example was from
       Vishay Dale, model number CCF60. The 3.3 k was from Multicomp, model
       number MF12.
03 | Keysight | Measuring High Voltages using the U8903A Audio Analyzer - Application Note



       U8903-83401 BNC Accessory
       The U8903A-109 BNC accessory kit is used to house the attenuator components
       as shown in Figure 3. Application note 5991-1466EN should be referred to for
       assembly instructions. Given the high voltage application care should be taken
       when positioning and soldering the resistors. Some heat shrink tubing may be
       beneficial on the ground lead of the 3.3 k resistor.




       Figure 3.




       Measurement Compensation
       With the attenuator connected to the input of the U8903A and 300 vRMS applied
       to the attenuator there will be around 9.5 v at the instrument input. This places the
       instrument in the 12.8 v range. The instrument should be fixed in this range via the
       input range menu.

       With the range set we need to compensate for the attenuator value, this can be
       done with the aid of the external gain function under the input settings of the
       analyzer as shown in Figure 4. The instrument will now compensate for the external
       attenuation and display the level at the input of the attenuator. A 300 vRMS
       measurement is demonstrated in Figure 5.




       Figure 4.                                                        Figure 5.



       Summary
       This note shows how the U8903A-109 accessory kit can be used to make a simple
       attenuator that will extend the measurement range of the U8903A audio analyz-
       er up to 300 vRMS. Measurement compensation using the instruments UI is also
       demonstrated.
04 | Keysight | Measuring High Voltages using the U8903A Audio Analyzer - Application Note




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