3-8 1 GHz Calibrator Power Level (ML248xx-Option 15, ML249xA) Chapter 3 — Performance Verification
3-14 PN: 13000-00164 Rev. K ML248xx, ML249xA MM
Expanded Uncertainty (K = 2) = ________________ (mW) (determined from the above equations)
Now that you have P
meas
and Expanded Uncertainty (K = 2), you can calculate lower and upper limits with the
following equation:
P
actual
=P
meas
±P
meas
x Expanded Uncertainty (K = 2) (%)
P
actual
Lower = ______________ mW
P
actual
Upper = ______________ mW
The accuracy specification for the reference calibrator output power level is 1 mW ± 0.012 mW/mW per year.
The maximum permissible error for the power output level, P
actual
should be within the range of
1 mW ±0.0015 mW/mW (for example: 0.9985 mW to 1.0015 mW). If P
actual
is outside of the 1 mW
±0.0015 mW/mW limit, perform Section 4-6 “RF Calibrator 50 MHz Frequency (ML248xx without Option 15)”
in Chapter 4, “Adjustment”.
3-8 1 GHz Calibrator Power Level (ML248xx-Option 15, ML249xA)
Repeat the steps in Section 3-7, and ensure the 1 GHz calibrator is selected instead of the 50 MHz calibrator
for Step 13.
Record measurements and calculations in “Pmeas Calculation” on page A-9.
3-9 50 MHz Calibrator VSWR Verification (All Models)
The following procedure is used to measure the VSWR of the RF Calibrator port when the 50 MHz Calibrator is
selected on the ML248xx and ML249xA power meters. This procedure uses many calculations. It’s
recommended to use a spreadsheet to enter the equations and calculate the results.
Required Equipment
• Agilent N432A Power Meter
• Agilent 8478B Power Sensor
• Agilent 34401A DMM or equivalent
• Anritsu S820E VNA or equivalent
Recording Results
Record measurements and calculations within this procedure, and record the final VSWR result within the
Test Records on page A-11.
Procedure
1. Power off the N432A.
2. Connect the power sensor cable to the N432A without connecting the power sensor.
3. Refer to Figure 3-6. Measure the resistance from the Vrf BNC center conductor on the rear of the N432A
to Pin 1 of the sensor cable.
4. Power on the N432A.
5. Go to the Channel Menu of the N432A and then scroll through the menu to select Bridge Resistance.
6. The internal N432A resistance can be changed between the 100, 200, 300 and 400 ohm settings. Select
the 100 ohm setting.
7. Power off the N432A.
8. With a DMM, measure the resistance of the new Bridge Resistance setting.
9. Record the measurement below.
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