4-6 RF Calibrator 50 MHz Frequency (ML248xx without Option 15) Chapter 4 — Adjustment
4-4 PN: 13000-00164 Rev. K ML248xx, ML249xA MM
4-6 RF Calibrator 50 MHz Frequency (ML248xx without Option 15)
(If the power meter is a ML2495/6A or ML248xx fitted with option 15 (1 GHz reference), go to Section 4-8.)
To calibrate the 50 MHz frequency of the reference:
1. Connect an RF frequency cable from the power meter RF calibrator output to an Anritsu MF2412B
frequency counter.
2. Set the RF calibrator to ON at 0 dBm by pressing the front panel keys as follows:
Cal/Zero | Calibrator | Calibrator RF
A bright green indicator is displayed in the button when the calibrator is switched on.
3. Adjust inductor core L12 with a non-metal adjustment tool for a frequency reading of 50 MHz ±500 kHz.
See Figure 4-1 for inductor location.
4. Disconnect the frequency counter from the power meter.
5. Record results and calculations in Section 4-6: RF Calibrator 50 MHz Frequency Adjustment (ML248xx
without Option 15) of Appendix A.
4-7 RF Calibrator Output Power (ML248xx without Option 15)
To adjust the RF Calibrator output power:
1. If the reference calibrator output power level is outside of the 1 mW ±0.0015 mW limits, adjust R82 and
recalculate P
actual
Upper and P
actual
Lower with the new V
0
,V
1
,andV
comp
numbers using the same
equations as in Section 3-7 of Chapter 3.
2. Repeat Step 1 until P
actual
Upper and P
actual
Lower are both within specification.
3. Record results and calculations in Section 4-7: RF Calibrator Output Power Adjustment (ML248xx
without Option 15) of Appendix A.
4-8 RF Calibrator 50 MHz Frequency and 50 MHz/1 GHz Output Power
Use the following steps to adjust and set the 50 MHz frequency and 50 MHz / 1 GHz Output Power Level on an
ML249xA or an ML248xx with option 15 installed. The values are entered into an EPROM on the calibrator
board and stored.
Required Equipment
• Frequency Counter: Anritsu MF2412B
• Power Meter: Agilent 432A
• Power Sensor: Agilent 8478B
• Voltmeter: Agilent 34420A Nano Volt, Micro-Ohm Meter
Preliminary Steps
1. Connect RF cable from calibrator to front panel of the MF2412B frequency counter.
2. Connect a GPIB cable from the PC to the unit under test.
3. Apply AC power to power meter and turn on.
4. Open Measurement & Automation Explorer on the PC desk top icon.
5. Navigate to GPIBO (PCI-GPIB) and search for Instrument0 as shown in Figure 4-2.
Note
If a metal adjustment tool is used, it must be removed from inductor L12 before reading the counter,
as the metal tool may affect the frequency.
To Next Page
Loading...
Need help?
General
