Signal Hound USB-SA44B, Руководство пользователя, Страница: 13 / 18

Calibration and Adjustment |
Limitations of the Signal Hound
9

Make sure the USB cable is connected at both ends, your PC is on and the USB drivers are
installed properly.

Is your PC or laptop configured in low power mode? The Signal Hound is a high-powered
USB device and may be shut down in some power-saving configurations. To remedy
this, open your computer’s Control Panel, and change your Power Options setting to High
Performance.
3) Your Signal Hound doesn’t find a signal

Is it a swept or transient signal, a pulse or a rapidly modulated signal? If so, and you know
the frequency of the signal, set up for a 200 KHz span or less, then turn “spur reject” off.
This disables the image rejection algorithm which will reject data if it has moved or
disappeared when the image is checked (it also allows the image frequency through, which
is 21.4 MHz above the CENTER FREQ). You may also try MAX HOLD to capture transient
signals.
4) Your phase noise seems too high
You may consider using a low phase noise external reference or contacting us about lower phase
noise options. Be aware that the Signal Hound phase noise is noticably higher than a YIG-based
spectrum analyzer, especially at higher frequencies.
5) You receive a specific error code
Error 1: Your Signal hound was not found on a USB port. Plug in your Signal Hound if it isn’t already.
If it is already plugged in, unplug it, reboot, re-install the USB driver, and/or try a different USB port.
Error 2-6: A USB communications error occurred. If multiple errors occur, close out of the software,
unplug the Signal Hound, wait 5 seconds, plug it back in and try again. If you get a recurring error,
please make a note of the error number, and e-mail or call tech support.
6) General Advice to avoid problems
 Use a DC block and limiter to protect your Signal Hound from DC voltages, ESD, and excess
RF power. This is especially important when connecting to antrennas or unknown signals.
 Do not overpower the Signal Hound.
5 Calibration and Adjustment
Contact Test Equipment Plus for more information regarding calibration services, or our free calibration
software and required equipment.