2-8 Third Order Intercept (TOI) Verification Spectrum Analyzer Verification
2-18 PN: 10580-00253 Rev. J S3xxE MM
2-8 Third Order Intercept (TOI) Verification
The following test verifies the Third Order Intercept point (also known as TOI or IP3) of the Spectrum
Analyzer in the S332E and S362.
Equipment Required
• Anritsu MG3692x Synthesizer (Qty 2)
• Anritsu ML2438A Power Meter
• Anritsu MA2442D Power Sensor
• Fixed Attenuator, Aeroflex/Weinschel Model 44-2 (Qty 2)
• Fixed Attenuator, Aeroflex/Weinschel Model 44-6 (Qty 2)
• Fixed Attenuator, Aeroflex/Weinschel Model 44-20 (Qty 2)
• Power Splitter, Aeroflex/Weinschel Model 1870A
• Adapter, Anritsu Model 34NN50A
• Frequency Reference Symmetricom Rubisource T&M
Procedure for 800 MHz TOI
1. Connect the 10 MHz Reference from the frequency reference to the 10 MHz Reference Inputs of the two
MG3692x synthesizers and the S3x2E.
2. Zero/Cal the MA2442D Power Sensor, and set the calibration factor of the sensor to 800 MHz.
3. Connect the MA2442D Power Sensor to the input of the 1870A splitter.
4. Connect the 28 dB of Attenuation to each output side of the 1870A splitter.
5. Connect one MG3692x to one 28 dB attenuator and connect the other MG3692x to the other 28 dB
attenuator. (The normal RF output connections will become input connections, and the normal input
connection will become the RF output connection.
6. Set one MG3692x to 799.951 MHz and set the other to 800.051 MHz.
7. Turn the RF Output of one MG3692x Off and turn On the other RF Output. Set the level of the MG3692x
that is On so that the MA2442D sensor reads –20 dBm.
8. Turn Off the MG3692x that is On, and turn On the one that is Off. Set the level so the MA2442D
reads –20 dBm.
9. Disconnect the MA2442D from the splitter, and connect the splitter to the S3x2E RF In port using the
34NN50A adapter.
10. Turn On the RF Output of the Synthesizer that is off, so that both MG3692x Synthesizers are On.
11. Press the On/Off key to turn
On
the S3x2E Site Master.
12. Put S3x2E into SPA Mode and Preset the instrument.
13. Using the Frequency menu, set the Center Frequency to 799.851 MHz and the Span to 100 Hz.
14. Using the BW menu, set the RBW to 10 Hz and VBW to 1Hz.
15. Using the Amplitude menu, set the Reference Level to –15 dBm, ensure that the Pre-Amp is Off, set the
Attenuation Level to 10 dB, then choose the Detection sub-menu and press RMS/Avg.
16. Using the Marker menu, press Peak Search and write down the level value.
17. Using the Frequency menu, set the Center Frequency to 800.151 MHz.
18. Using the Marker menu, press Peak Search and write down the level value.
Caution Before continuing, allow a 30 minute warm up period for the internal circuitry to stabilize.
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