ML248xx, ML249xA MM PN: 13000-00164 Rev. K 4-1
Chapter 4 — Adjustment
4-1 Introduction
This chapter describes the process of calibrating the ML248xx and ML249xA Power Meter.
4-2 Required Test Equipment
The following test equipment is required to perform the procedures in this chapter.
• Digital Voltmeter (DVM) with ±0.0015 % basic 24 hour DCV accuracy
Example: Agilent 34401A
• ML2419A Range Calibrator
• Frequency Counter
Example: Anritsu MF2412A
• Anritsu MA24xxA Series Power Sensor (not MA2411A)
• Non-magnetic tuning wand with a screwdriver tip for 6-32 slotted cores
• Agilent Analog Power Meter 432A to be used in conjunction with:
• Agilent Voltage Meter 34420A.
• Agilent Power Sensor 8478B.
4-3 Test Conditions
The power meter must be operated under controlled conditions of temperature and humidity in order to meet
its specified precision and stability. All tests should ideally be performed at a temperature of 25 °C ±5 °C
(77 °F ±7 °F) and a relative humidity of less than 75 % non-condensing.
4-4 Pre-Test Setup
1. With power disconnected, open the unit by loosening the six captive screws on the underside and
separating the top half of the case from the base. Ensure that the front and rear panels remain firmly in
place during this operation.
2. Apply power to the unit using the AC inlet on the rear panel and verify that the meter has completed the
Power On Self Test (POST).
3. Prior to making any precision measurements, allow the power meter to warm up for a period of
15 minutes from power on. If the power supply is interrupted for any reason, allow a similar settling
period.
Note
Procedures in this section should be performed by qualified technical personnel only. These
procedures require access to internal test points and adjustment potentiometers. Care should be
taken to avoid contact with potentially hazardous voltages or damage to the equipment.
Note Ensure all test equipment is within its calibration period.