Calibration
This task may be performed to eliminate the frequency response
contribution of the 89411A and attached RF/microwave spectrum analyzer
when making down-converted measurements.
The 89410A has the capability to control certain HP/Agilent spectrum
analyzers over the GPIB by issuing the appropriate commands for changing
the analyzer’s frequency and vertical scaling. These commands set the
center frequency, span, and linear display mode. The commands are
compatabile with the HP/Agilent 8566A/B, HP/Agilent 8568A/B and MMS
systems using L.O./Control module 70900A/B.
So, in addition to the signal cabling you would normally use with the
89411A, the GPIB should be connected and the address of the RF analyzer
should be checked so that it does not conflict with the address of any
other attached peripherals or other instruments. You should also set the
89410A to be system controller (under the ‘Local/Setup’ key). If you are
using an MMS (70000) system or have other devices which are capable of
being system controller, you should make sure they are not configured to
be system controller at this time.
Note If you have installed option UFG or UTH (4 MByte or 20 MByte extended RAM
and additional I/O), the GPIB port on the option board is used for control of an
external receiver. The main GPIB port can be used for other functions such as
allowing control of the 89410A from an external computer. The 89410A is
always the system controller on the option board GPIB interface while the
main GPIB interface can be configured as either system controller or
talker/listener.
Take the cable which would normally be connected from the 89411A
output to the 89410A channel 1 input and connect it from the 89410A
source to the channel 1 input instead. Set up the 89410A as follows:
1. Initialize the analyzer. Press [Preset].
2. Set up the IF parameters.
Press [
Instrument Mode], [receiver], [IF section (0-10 MHz)].
Press [
mirror freq off]*.
Press [
external setup], [IF center], 5.6 [MHz] (required by the 89411A).
Press [
IF bandwidth], 3 [MHz]†.
Press [
minimum freq], 0 [Hz].
Using the Agilent 89411A Downconverter
15-8
* For frequencies in the lowest conversion band of the RF analyzer one ‘mirroring’ will occur, and another
one is contributed by the 89411A.
† This should be set to the maximum RBW that the RF/ microwave analyzer supports.
To Next Page
Loading...
Need help?
General
