General Information; Description; Accessories Supplied; Options - HP 11941A Operation Note

HP 11941 OPERATION NOTE
1-1. GENERAL INFORMATION
1-2. Description
1-3. The HP 11941A Close-Field Probe is a hand-held electromagnetic field sensor designed to make
repeatable, calibrated magnetic field measurements from 9 kHz to 30 MHz. It is optimized for the location
and measurement of sources of electromagnetic interference (EMI) in electronic equipment The HP
11941A can also be used as a localized magnetic field source when operated in conjunction with an
appropriate signal generator, thereby allowing circuit-board-level susceptibility testing of instruments.
1-4. Accessories Supplied
1-5. The following three accessories are included with the probe:
• One 2m (6.6 ft.) double-shielded RF cable with two SMA (male) end connector, HP Part Number
8120-4811
• One Type N (male) to SMA (female) adapter, HP Part Number 1250-1250
• One BNC (male) to SMA (female) adapter, HP Part Number 1250-1700
The double-shielded cable (RG-223), reduces measurement errors in high field impedance environments by
minimizing current leakage through the braided coaxial outer conductors. For less demanding applications,
the use of a more flexible single-shielded cable type Is sufficient (e.g., RG-58, RG-174).
1-6. Options
1-7. Three options are available for the HP 11941 A.
1-8. Option 001
includes a factory-installed SMA RF Rotary Joint connector, HP Part Number 0955-0323,
Check Digit 5, (See figure 17.) The connector increases handling flexibility of the probe by removing any
rotational torque from the interconnect cable. The rotary joint is especially useful when making
measurements using the double-shielded cable. Section 5-4 includes instructions on installing the rotary joint
1-9.
Option
003 consists of the HP 11941A Close-Field Probe without the double-shielded cable or the two
adapters.
1-10. Option 910
includes an additional Operation Note.
1-11. Initial Inspection
1-12. If the shipment contents are incomplete or damaged, notify the nearest Hewlett-Packard office. If the
shipping container is damaged, or the cushioning material shows signs of stress, notify the carrier as well as
the Hewlett-Packard office. Keep the shipping materials for the carrier's inspection. The HP office will
arrange for repair or replacement without waiting for a claim settlement
1-13. See Paragraph 4-1 for Operation Verification.
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