Manual - 8500A Series Peak Power Meter - Giga-tronics

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Testing and Calibration 5.2.2 Calibrator Return Loss Test Set up the scalar analyzer, signal generator, and the Return Loss Bridge to measure 0.95 to 1.05 GHz. Connect the bridge to the Calibrator output on the front panel of the PPM. The return loss must be >25 dB over the frequency range. 5.2.3 Calibrator Output Level Test The following test will check the absolute level of the Calibrator function of the PPM. Note that verifying the level is not the same as setting the level. When the calibrator was previously adjusted, it was done using equipment capable of setting it to a level within the specifications of the instrument. The equipment used to verify the value also has its own uncertainties. Due to the nature of the measurement, equipment does not exist to make it practical to require a ten times (or even 3 times) accuracy difference between the specified performance and the specified accuracy of the measuring equipment. Therefore, the uncertainty allowed for this test reflects both the uncertainty of the calibrator and the uncertainty of the power meter used to verify it. 1. Place the PPM in the CW Mode by pressing [CW], then press [MENU] and select Calibration. When the Calibration/Zeroing menu appears, press [F1] and then immediately press [7]. Be sure that the Thermistor Power Meter is zeroed. Connect it to the Calibrator output connection and set it to the 1 mW range. The calibrator should read 1 mW. To be sure that the measurement is correct, the following steps must be performed exactly as given. Under no circumstances should any key be pressed other than the ones specified. CAUTION Do not press any UNITS key when the thermistor detector is connected to the calibrator. This would cause the calibrator to output 100 mW, and would possibly destroy the thermistor detector. 2. Press [CLEAR], then zero the Thermistor Power Meter. 3. Press [7] and read the Thermistor Power Meter. Take note of the meter reading. 4. Repeat Steps 1 and 2. Average six readings if successive readings are taken. 5. Disconnect the Thermistor Power Meter from the Calibrator connection. The average reading in Step 3 should be 1.000 mW ±4.5% after correcting for the calibration factor of the thermistor mount at 1 GHz. Note that an uncertainty smaller than 4.5% can be supported by this technique if the calibration factor of the detector has been determined by a primary standards laboratory such as the NIST (formerly NBS). This value merely reflects standard current commercial practice. 5.2.4 Instrument Plus Power Detector Linearity Test Connect the test setup as shown in Figure 5-1. The linearity will be tested in a series of 10 dB steps over the range of the instrument. At low power levels, the linearity measurement will reflect the uncertainty due to the noise specification. Measurements will be made in both the CW and Peak Modes. Refer to the CW Linearity Data and the Peak Linearity Data sections of the Test Data recording sheets at the end of this chapter. These sections will facilitate the collection of data for the CW and Peak power linearity test. The tolerance is already entered in each section for the various steps, and includes an allowance for specified noise errors at low power levels. Manual No. 20790, Rev C, November 1998 5-3 Superceded by Revision D, March 2009
Series 8500A Peak Power Meters 5.2.5 Power Linearity Test Setup Figure 5-1. Power Linearity Test Setup To make accurate measurements using the thermistor power meter, it is essential that it be zeroed properly. This should be checked frequently, keeping in mind that the instrument must be zeroed again if any drift has occurred. For each value of attenuation the following steps are to be performed: 1. After initial power-on and warm up, set the PPM to read CW power in milliwatts, with the CW averaging number set to 500. This is done by pressing [CW] [MENU] (2) [F1] [500] [UNITS] 2. Check that the display indication is in milliwatts. If not, press [MENU] (4) [F3]. 3. Be sure that the RF source is set to 1.0 GHz. 4. Perform an automatic calibration on the detector (use channel A for an 8502A). Use this detector for the rest of the test. 5. Automatic calibration is performed by first attaching the detector to the 1 GHz Calibrator connection on the front panel of the PPM, and then pressing [MENU] (1) [F3] [F1] [UNITS] 6. Be sure that the Thermistor Power Meter is zeroed correctly. Adjust the RF source for a reading of 10.0 mW ±0.25 mW. 7. Record the Power Meter Reading and the PPM Reading in the corresponding columns of the CW Linearity Data section of the Performance Verification Test Data recording sheet. 8. Adjust the source to read 1.0 mW ±0.025 mW. 9. Record the Power Meter Reading and the PPM Reading in the corresponding columns of the Test Data recording sheet. 10. Calculate the power ratio and reading ratio (using P1/P2 and R1/R2), and record these values in the indicated columns of the Test Data recording sheet. 11. Calculate the linearity error using the formula: Linearity error (%) = [(R1/R2) / (P1/P2) - 1] * 100 5-4 Manual No. 20790, Rev C, November 1998 Superceded by Revision D, March 2009
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Manual - 8500A Series Peak Power Meter - Giga-tronics

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