Anritsu ML2480B Series Maintenance Manual

Chapter 3 — Performance Verification 3-5 50 MHz Calibrator Frequency (All Models)
ML248xx, ML249xA MM PN: 13000-00164 Rev. K 3-5
3-5 50 MHz Calibrator Frequency (All Models)
The following procedure is used to measure the 50 MHz Calibrator output frequency of the ML248xx and
ML249xA power meters.
Required Equipment
• Anritsu MF2412B Frequency Counter or equivalent
• RF Cable with BNC male connection at one end and N-type male connection at other end.
Procedure
1. Power on the power meter and frequency counter. Allow both to warm up for 15 minutes before taking
measurements.
2. On the MF2412B:
a. Press the Preset key.
b. Press the Input key.
c. Press the Left Arrow (<) key to highlight Input CH area.
d. Press the Enter key until Input 2 is selected.
e. Press the Right Arrow (>) key to highlight the Impd2 area.
f. Press the Enter key until 50 Ohms is selected.
g. Press the Return to Meas key.
3. Connect an RF cable from Input2 of the MF2412B to the Calibrator output of the power meter.
4. On the power meter, turn on the RF calibrator by pressing the Cal / Zero key, then the Calibrator soft key,
and then the RF Calibrator soft key.
5. With the RF calibrator on, the MF2412B frequency counter should be reading the frequency of the
calibrator output. Record the frequency below and in “Calibrator Frequency Uncertainty” on page A-4.
F
meas
= ____________________ Hz
Calibrator Frequency Uncertainty
The sources of uncertainties of the frequency counter measurement at 50 MHz include:
• One Count: Least significant digits (LSD) of the frequency counter
• Time base accuracy from either of the following:
• GPS Disciplined Oscillator
• MF2412B Frequency Counter
• Residual error of the frequency counter:
• Normal Mode; Measurement Frequency / 1E
10
• Fast Mode; Measurement Frequency / 2E
9
Use the following equation to determine the expanded measurement uncertainty (U
f
) with coverage factor
K = 2, 95 % level of confidence.
1. For the MF2412B, use the following numbers to determine U
f
.
• One count = 1
• Time base accuracy (TBA) for the MF2412B:
• TBA = 7.5E
–8
with option 1
• TBA = 4.5E
–8
with option 2
• TBA = 1.5E
–8
with option 3

Anritsu ML2480B Series Specifications

General

Brand	Anritsu
Model	ML2480B Series
Category	Measuring Instruments
Language	English