Boonton 4500B Peak Power Meter - Manual (Page 337)

Boonton 4500B RF Peak Power Analyzer
Maintenance 7-5
Calibrator Frequency Verification
Before performing the calibrator frequency and linearity verification procedure, photocopy Table
7-2 and use it to record the measurement data. Attach the completed table to the Checklist.
To verify the calibrator frequency accuracy, proceed as follows:
1. Press the Init system key to initialize the Model 4500B.
2. Set the calibrator output level to 0.0 dBm by selecting Calibrator > Set Level > 0.0 dBm.
3. Set the calibrator output mode to CW by selecting Spcl > Calibrator > Cal Mode > CW.
4. Connect the frequency counter to the Model 4500B 1 GHz calibrator output.
5. Enable the calibrator output by selecting Calibrator > Cal Output > On.
6. Measure the calibrator frequency and record the test result in Table 7-2.
Calibrator Linearity Verification
Verify calibrator linearity by establishing a reference at 0.0 dBm and measuring the error at
various test levels in the range from -30 to +20 dBm. The measurement tolerance shown in Tables
7-3a and 7-3b reflect both the specified calibrator performance and the uncertainty of the
measurement setup. To avoid the nonlinearity term associated with using the HP8481A at levels
above +9 dBm, use a 15 dB pad to attenuate higher calibrator levels to below +5.0 dBm.
Before performing the calibrator linearity verification procedure, photocopy Tables 7-3a and 7-3b
and use the copies to record the measurement data. Attach the completed tables to the Checklist.
To verify calibrator linearity:
1. Mount the 8481A sensor on the EPM Power Meter. After the warm up period, calibrate and
zero the EPM power meter using its internal 50 MHz calibrator.
2. Disable the calibrator output by selecting Calibrator > Cal Output > OFF.
3. Connect the 8481A sensor to the Model 4500B 1 GHz calibrator output through the 15 dB
precision attenuator.
4. Set the calibrator output level to 0.0 dBm by selecting Calibrator > Set Level > 0.0 dBm.
5. Enable the calibrator output by selecting Calibrator > Cal Output > ON.
6. Set a reference on the EPM power meter at 0.0 dBm.
7. Enter the calibrator levels listed in Table 7-3a and record the EPM power meter
measurements in the column labeled ―Measured.‖
8. Disable the calibrator output by selecting Calibrator > Cal Output > OFF.