Lisa,
Your assumption is correct. I have always used software which
levels to the power
levels established during the calibration process without the modulation
applied. Once the forward power is achieved, the modulation is applied and
the equipment under test is subjected to the modulated signal for the
predetermined "dwell time". Modulation is then removed whilst leveling is
achieved at the next frequency point.
Leveling of both field strength (during the calibration phase) and power
(during the test phase) are usually performed using pure carrier wave,
largely because the measuring instruments dont behave reliably in the
presence of modulation (with the exception of thermal power probes). Also
test standards usually specify the test level (eg 10 V/m) as an unmodulated
carrier.
Good luck,
Simon Rate.
> -----Original Message-----
> From: [email protected] [SMTP:[email protected]]
> Sent: Tuesday, April 06, 1999 12:59 PM
> To: [email protected]
> Subject: ? on EN 50140 - help!
>
>
>
> Could someone please clarify the following : the test procedure for EN
> 50140
> states "the frequency range is swept from 80 MHz to 1000MHz, using the
> power
> levels established during the calibration process, and with the signal 80%
> amplitude modulated with a 1 kHz sinewave pausing to adjust the RF signal
> level
> or to switch oscillators and antennas as necessary"
>
> Does this mean that the modulation is to be turned on and off during the
> stepping or sweeping of frequency? I have never heard of doing this but I
> have
> been asked to respond to the question. Can anyone shed some light as to
> why
> someone would interpret it that way??
>
>
> thank you!!!
>
> Lisa
>
>
>
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