8662AOptionH17
08662-92035
Page 6 of 15
On page 3-71, under Modulation, External Source (Cont'd), add the following:
Description Special AM Mode
External AM below 150 kHz can only be introduced via the
Modulation Input jack. At the minimum carrier frequency of 20
kHz, the maximum AM rate is approximately 1500 Hz. For
proper AM below 150 kHz, an output level of <+8 dBm should be
maintained.
Procedure
To enable Special AM Mode (designed for use below 150 kHz),
press Special Function 50.
To disable Special AM Mode, press Special Function 51.
Maintain this status for normal 8662A operation either above or
below 150 kHz.
Keys and
Program Codes
<HP-IB>
Keys
Blue Key SPECIAL
Special AM Mode ON
Special AM Mode OFF
Codes (see note)
SP
50
51
BL,
AP
NOTE
If the 8662A is under HP-IB control, Special Function
51
must be
programmed to provide normal operation.
Indications
Comments
When using Special AM Mode, the EXTERNAL SOURCE
HI-LO enunciators will be inoperative. Also, there is no normal
front panel indication when the Special AM Mode is selected.
Press the STATUS key: If
"51"
is not displayed at the left, the
Special AM Mode is on.
Certain components in the ALC circuitry of the 8662A have been
changed for option HI7. To allow External AM below 150 kHz,
carrier output level accuracy was degraded. Therefore, output
level accuracy is not specified during operation of the instrument
from 10 kHz to 150 kHz carrier frequencies. Also note that
normal 8662A AM will only operate accurately if Special AM
Mode is disabled.
Copyright 1983 - HEWLETT-PACKARD COMPANY - Spokane Division
24001 E. Mission Ave, Liberty Lake, WA 99019-9599 U.S.A.
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