Error Messages and Troubleshooting
R&S
®
ZNC
734
User Manual 1173.9557.02 ─ 13
8.1.1 Asynchronous Errors
Asynchronous errors can occur any time while the analyzer is operating. The analyzer is
checked periodically for asynchronous errors. Many of these errors also cause an entry
in the status reporting system.
Error
Description
Remedy
Bit no.*)
Instrument tempera-
ture is too high
The analyzer detects that the instrument tempera-
ture is too high. After three warnings, the analyzer is
shut down.
Reduce ambient temperature, keep
ventilation holes of the casing unob-
structed.
7
Receiver overload
protection tripped
The analyzer detects an excessive input level at one
of the ports. If this condition persists, all internal and
external generators are switched off (Channel –
Power Bandwidth Average – RF Off).
Reduce RF input level at the port.
Check amplifiers in the external test
setup.
3
Reference frequency
lock failure
With external reference signal (System – External
Reference active) or option ZVAB-B4 (oven quartz),
the reference oscillator is phase locked to a 10 MHz
signal. The message appears when this phase
locked loop (PLL) fails.
For external reference: check fre-
quency and level of the supplied ref-
erence signal.
1
Converter clock fre-
quency lock failure
The clock generator for the AD converter clock is
phase locked to the reference oscillator. The mes-
sage appears when this PLL fails.
–
–
Oven cold
With option R&S ZVAB-B4, oven quartz: The oven
temperature is too low.
Wait until the oven has been heated
up
8
*) The following bits in the
STATus:QUEStionable:INTegrity:HARDware
register
are set when the error occurs.
8.1.2 Errors during Measurement
The following errors are due to inadmissible hardware settings and states during the
measurement process. Some of the errors also cause an entry in the status reporting
system.
Error
Description
Remedy
Bit no.*)
Unstable level con-
trol at port <i>
The analyzer detects an excessive source level at one
of the ports. The signal is turned off and the sweep
halted.
Check signal path for the wave ai,
especially check external components.
Then press "Channel > Sweep >
Sweep Control > Restart Sweep".
9
Problem concern-
ing external power
meter Pmet<i>
An external power meter has been configured, how-
ever, it cannot be controlled or provides error mes-
sages. If several power meters cause problems, the
lowest number is indicated.
Check whether the power meter is
properly connected and switched on.
Check the GPIB address; exclude
address conflicts when using several
external power meters or other equip-
ment.
11
Time grid too close The sweep points for a time sweep are too close, the
analyzer cannot process the measurement data until
the next sweep point starts.
Increase stop time, reduce no. of
points, increase IF bandwidth. If possi-
ble reduce number of partial measure-
ments, e.g. by restricting the number of
ports measured.
12
Errors during Firmware Operation
