Remote Control
R&S
®
ZNC
358
User Manual 1173.9557.02 ─ 13
Bit No.
Meaning
0
Not used
1
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. This bit is set if
this phase locked loop (PLL) fails.
For external reference: check frequency and level of the supplied reference signal.
2
Output power unleveled
This bit is set if the level control at one of the ports is unsettled or unstable, possibly due to
an external disturbing signal.
Change generator level at the port; check external components.
3
Receiver overload protection tripped
This bit is set if the analyzer detects an excessive input level at one of the ports. If this
condition persists, all internal sources are switched off.
Reduce RF input level at the port. Check amplifiers in the external test setup, then switch on
the internal source using
OUTPut ON
.
...
Not used
6
Internal communication error
This bit is set if an internal error caused the analyzer to perform an automatic hardware reset.
The current measurement results are possibly invalid.
The bit is automatically cleared at the beginning of the next sweep, no action is required.
7
Instrument temperature is too high
This bit is set if the analyzer detects that the instrument temperature is too high.
Reduce ambient temperature, keep ventilation holes of the casing unobstructed.
8
Oven cold
This bit is set if the oven for the optional oven quartz (OCXO, option ZVAB-B4) is not at its
operating temperature.
Wait until the oven has been heated up.
9
Unstable level control
This bit is set if 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 received wave, especially check external components. Then restart
the sweep (
INITiate<Ch>[:IMMediate]
).
10
not used
11
Problem concerning external power meter
This bit is set if an external power meter has been configured but cannot be controlled or
provides error messages.
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
equipment.
12
Time grid too close
This bit is set if the sweep points for a time sweep are too close, so that the analyzer cannot
process the measurement data until the next sweep point starts.
Increase stop time, reduce no. of points, increase IF bandwidth. If possible reduce number
of partial measurements, e.g. by restricting the number of ports measured.
Status Reporting System
