7
Annunciator/Message Comment
SN This annunciator denotes serial number and is displayed at turn-on when
the detector’s serial number is displayed.
dBm This annunciator specifies that either dB or dBm measurements are being
displayed.
REL This annunciator specifies that relative measurements are being displayed.
k µ m Only one of the characters of this annunciator will light at any time to specify
engineering prefixes of kilo, micro, nano, or milli. The “m” in this annunciator
serves as both “m” and “n”.
W This annunciator specifies that measurements in units of watts are being
displayed.
nm This annunciator indicates nanometer whenever the wavelength is displayed.
ATTN The responsivity in use includes the effect of the detector’s OD3 attenuator.
AUTO Automatic signal ranging is activated.
ZERO Background signal subtraction (zeroing) is activated.
HOLD No new readings will be displayed, nor be available on the remote interface bus.
REM The meter has received a command/query either through the IEEE 488 or
the RS-232C bus.
LLO The meter has been set to local-lockout from the remote interface bus and
will not respond to any front panel keys.
AVG: S M F Either Slow, Medium, or Fast numerical averaging for the displayed
measurement is activated.
OL This message indicates that the input signal level exceeds the capability of
the present signal range. Either use auto-ranging or increment the signal
range until the OL message goes away.
SA This message indicates that the input signal level exceeds the specified
saturation current of the detector being used with the meter. This level is
detector dependent.
CAL This message indicates that the meter is currently performing an auto-
calibration. The auto-calibration process involves measuring amplifier offset
voltages. See Section 2.5 for more details.
Table 2. 1830-C Display Annunciators/Messages
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