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HP 11941 OPERATION NOTE
4-1. OPERATION VERIFICATION
4-2. Operation Verification for the HP 11941A consists of two tests: an output impedance measurement test,
and an insertion loss measurement test. Each test is relative and designed to detect damage in specific parts
of the circuitry. These tests are not designed to verify antenna-factor calibration, which requires a
calibrated magnetic field.
4-3. Probes that fail these tests may still detect electromagnetic radiation. In this case, the probe circuitry
no longer rejects electric field coupling and the antenna factors listed on the unit are no longer valid.
4-4. In the test procedures, instrument softkeys will be represented by
print. Softkeys are keys
whose function is defined by text on the display.
4-5. Calibration Cycle
4-6. Field-site recalibration of the HP 11941A antenna factors is not possible. However, the probe's antenna
factors can be recalibrated at the factory. A three (3) year recertification cycle is* recommended. Refer to
section 6-1 for factory recalibration information.
4-7. The HP 11941A contains no internal user-accessible adjustments or parts. The SMA adapter (see figure
16) is the only external replaceable part
4-8. Output Impedance Measurement Test
Description
This test measures the impedance of the HP 11941A at the SMA port over a frequency range of 100 kHz
to 1 MHz, to detect any damage in the output circuitry. Any equipment that satisfies the following critical
specifications for the test setup may be substituted for the recommended equipment:
Frequency Range
Test Port Match
. 100 kHz to 1 MHz
>15 dB Return Loss
Recommended Equipment
Network Analyzer...HP 3577A
S-Parameter Test Set.... ...
HP 35677A
Adapters:
Type N (m) to APC 3.5 (m)...HP 1250-1743
Accessories:
50 ohm Load, APC 3.5 (f)
Coaxial Short, APC 3.5 (f)
Open, APC 3.5 (f).
HP 909D, Option on
.HP 1250-1769
.HP 1250-1767
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