13
25A1090 (Rev.3)
SERVICE PROCEDURES
MEASUREMENT REFERENCE
NOTE: Audio levels in dBu are marked as dBm on the HP8903.
REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):
dB Conversion Chart
0dBV = 2.2 dBu
0dBu = 0dBm assuming the load = 600 ohms
Be aware that dBu is a measure of voltage and dBm
is a measure of power. The HP8903, for example,
should be labeled dBu instead of dBm since it is a
voltage measurement. These two terms are often
used interchangeably even though they have
different meanings.
Spectrum analyzer or power meter HP8591E/Agilent E4403B/Agilent E4407B
Digital multimeter Fluke 87
Audio Analyzer HP 8903B
RF Signal Generator HP 8656B or HP E4400B
Frequency Counter HP 53181/HP 5385A
Receiver Matching SLX4 Receiver
50 ohm, RG-174 BNC to open (stripped)
coaxial cable or "rocket launcher" tip (P/N
95A8278). For JB, Murata cable #
MXGS83RK3000 may be used.
Shure PT 1824
Audio Test Head Shure PT1840
Brass Ring Shure PT1838Y
BNC (Male) to BNC (Male) Cable (2) Shure PT1838A
DC Blocker Shure PT1838W
XLR (Female) to Banana Plug Adapter Shure PT1841
20 dB Attenuator Shure PT1838T
Toray non-inductive tuning tool - BLUE Shure PT1838K
Toray non-inductive tuning tool - PINK Shure PT1838L
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