Command reference
R&S
®
ZNL/ZNLE
639
User Manual 1178.5966.02 ─ 19
Bit No.
Meaning
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 can-
not 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.
14
Power settings exceed hardware limits
This bit is set if the source power at one of the test ports is too high or too low.
Reduce or increase the source power.
15
Detector MEAS time has been internally limited
This bit is set if the selected measurement time for a detector (observation time) is too
long.
If desired, reduce the measurement time or select a smaller IF bandwidth.
11.4.4.4
Application of the status reporting system
The purpose of the status reporting system is to monitor the status of one or several
devices in a measuring system. To do this and react appropriately, the controller must
receive and evaluate the information of all devices. The following standard methods
described in the following sections are used:
●
Service request (SRQ) initiated by the measuring device
●
Serial poll of all devices in the bus system, initiated by the controller to find out who
sent an SRQ and why
●
Parallel poll of all devices
●
Query of a specific instrument status by commands
●
Query of the error queue
Service request
The R&S
ZNL/ZNLE can send a service request (SRQ) to the controller. Usually this
service request causes an interrupt, to which the control program can react appropri-
ately.
Initiating an SRQ
As shown in section
, an SRQ is initiated if one or several
of bits 2, 3, 4, 5 or 7 of the status byte are set and enabled in the SRE. Each of these
bits summarizes the information of a further register, the error queue or the output buf-
fer.
VNA remote control basics