3
Troubleshooting and Maintenance
42
Keysight M1970 Series User’s Guide
Troubleshooting
Table 3-1
Troubleshooting procedure
Problem
Possible cause/troubleshooting process
Green Active LED does not turn on
when mixer is connected to
spectrum analyzer through USB
cable.
– Spectrum analyzer not providing power.
– Faulty or loose USB cable.
– Faulty mixer.
Troubleshooting
:
Connect another USB device to the signal analyzer.
Red Error LED on mixer lights up
(mixer fails the LO alignment
routine).
– The SMA cable must be attached before the USB cable is plugged in. If the SMA cable
was not plugged in first, assure that the SMA cable is connected properly, then
disconnect and reconnect the USB cable.
– The SMA cable is damaged or has too much loss (cable length is too long). Replace the
SMA cable with one that is
<
3 meters.
– Faulty mixer.
– The signal analyzer LO output is faulty:
To test the LO output, remove the SMA cable from the Ext Mixer connector, and unplug
the USB cable.
1
Press
Input/Output
,
External Mixer
,
Ext Mix Setup
,
Mixer Presets
.
2
Select
Single Harmonic w/doubler
, select
V-Band
.
3
Press the
Freq
key,
Center Frequency
,
60 GHz
. Then press
Span
,
Zero Span
.
4
Connect a spectrum analyzer capable of measuring a 13 GHz signal to the Ext Mixer
connector.
5
Tune the measuring spectrum analyzer to
10.0537 GHz
center frequency, and the LO
signal level at the Ext Mixer connector should be +15 dBm ± 2 dB.
Yellow Busy LED does not come on
when USB cable is attached and LO
Align does not start.
Assure that only one mixer is connected. Unplug any other mixer USB connection, then on
the desired mixer, remove the USB cable and re-insert the USB cable to initiate the LO
adjustment.
Содержание M1970 Series
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