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HP 11941 OPERATION NOTE
4-9. Insertion Loss IVleasurement Test
Description
The insertion loss test is a relative indicator of damage in the input circuitry. Using a second HP 11941A as
a magnetic field source, this test selectively injects a magnetic field into each loop of the HP 11941A being
tested. Damage is indicated by differences in the measured output voltages. It is important to orient the two
probes properly as shown in figures 12 through 15. To facilitate testing, the source probe should be fixed in
place, the tip flush with the work surface (preferably wooden). This can be accomplished with clamps or
tape, which should be no closer than 50.8 mm (2 in.) to the source tip. Other test equipment may be
substituted if it meets or exceeds the critical specifications for the instruments listed below. Throughout the
test procedure, the probe being tested will be referred to as the DUT (Device Under Test).
Recommended Equipment
Network Analyzer...t . ..HP 3577A
S-Parameter Test Set. . .. HP 35677A
Field-Source. HP 11941A
Adapters:
Type N (m) to APC 3.5 (m) (2 required).HP 1250-1743
Cables:
SMA (m) to SMA (m), 2m (2 required) . ..HP 8120-4811
Procedure
1. Connect the equipment as shown in figure 12. Allow the HP 3577A 60 minutes of warm-up time.
HP 3577A
NETWORK ANALYZER
iPiiini
_2_2
IN
R A
B
SMA
CABLE
ASSY
PORT
i1
HP 35677A
S-PARAMETER
TEST SET
PORT
#2
SMA CABLE ASSY
L_r
L
' '
'
.
'V
PROBES
i
] vttan
...
SOURCE
/
DUT
SEE DETAIL IN
FIGURE 14.
Figure 12. Insertion Loss Test Setup
13
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