HP 4937A Operating And Service Manual page 51

. 4937A
./FREQUENCY
. Level and Frequency (con't)
ilVER
,ing the MEAS SELECT key select LEVEL FREQUENCY,
ess DtSPLAY-RCV key to display the received signal. RCV indicator will light. Level can be read
the left display.
1
Err 01 displayed indicates the signal is >+16 dBm. An Err 02 displayed indicates the signal is
■70 dBm.
>r attenuation distortion measurments press LEVEL ZERO key to set the received ^ ^
subsequent ieve! measurements will be made relative to this point. Pressing the LEVEL ZERO
V a second time reverts the level to absolute units (dBm) instead of relative units (dB), A nega-
e reading indicates levels higher than the reference level per the telephone industry convention,