Shure U2 - Test Equipment; Measurement Reference; Reference Material

Shure U2 Hand-Held UHF Transmitter
Service Procedures25B1022 (AG) 13
Test Equipment
Measurement Reference
dBu is a measure of voltage, and dBm is a measure of power.
For example, the HP8903 should be labeled dBu instead of dBm
because it is a voltage measurement. These two terms are often used
interchangeably even though they have different meanings.
Audio levels in dBu are marked as dBm on the HP8903.
dB Conversion Chart
0 dBV = 2.2 dBu
0 dBu = 0 dBm, assuming the load = 600 Ω
Table 1
Test Equipment
Equipment Type Model
Audio analyzer *Hewlett-Packard 8903B
Digital multimeter Fluke 87
Rf signal generator Hewlett-Packard 8656B
Frequency counter Hewlett-Packard 53181A
Spectrum analyzer Hewlett-Packard 8590L
Shure U4 receiver Shure U4
SMC to BNC Adapter PT1838S
Audio Test Head PT1840
Test Head Brass Ring PT1838Y
*Audio levels in dBu are marked as dBm on the HP8903B.
Reference Material
Use the Shure UHF Wireless System User’s Guide for information
on Controls, Operation, Specifications, etc. Refer to the appropriate
User’s Guide or User’s Guide Supplement for information on frequency
compatibility.