HP 8647A - Page 67

01 1
Amplitudeexceeds ATTNHOLDlimits
This message is displayed when [-HOLD) is on and the
amplitude is set
to a level that exceeds the vernier range
limits by greater than
5 dBm. Exceeding the 10 dB vernier
range of an attenuator hold setting causes the output level
accuracy to degrade. For information about the vernier
ranges and limits, refer to “Atten Hold” in Chapter
lb,
“Operation Reference. ”
No externaldc coupling for AM
This message is dimlaved when AM is selected and
012
013
014
015
020
02 1
022
~EXTDC) or-ci kHz +*EX+ DC) is also selected. DC coupling
of an external source is not possible for
AM. If you press
kHz + EXT DC) YOU will actually get 1 kHz and external UC.
Or, select CEXT) coupling for AM. Additional internal plus
external modulation capabilities (such
as 1 kHz + EXT AC)
are available through HP-IB control of the instrument; refer
to Chapter
2, “HP-IB Programming.”
AMunspecifiedabove4dBm
This message is displayed when AM is selected and
amplitude is set to greater than 4 dBm. To insure that
AM
will meet its specified performance, reduce the amplitude
setting to
4 dBm or less.
AMunspecifiedatorbelow1.5MHz
This is caused when AM is selected and RF frequency is set
to 1.5
MHz or less. To insure that AM will meet its specified
performance, increase the RF frequency setting.
Help messages off
This message is displayed when the instrument is powered
up and the rear panel help switch has been set to disable
the following error messages:
001 , 002, 004 , 005 , 006 ,
007, 008, 010, 011, 012, 013, 014. The second switch
position (next to the timebase adjust, labeled
“NOT USED”)
controls the display of these messages.
Press lsAVl to copy memory FROM 8647/8
This message is displayed when the (IJJ key is pressed on an
HP 83301A Memory Interface connected to the instrument.
Press the
the instrument into the memory interface.
Copyingregistersfrom8647/8
This message is displayed while the memory registers are
being copied from the instrument to the HP 83301A Memory
Interface.
Press(SAV)to copymemory TO 8647/8
This message is displayed when the key is pressed on an
HP 83301A Memory Interface connected to the instrument.
Press the key to copy memory registers that had been
saved in the memory interface into the instrument.
key
to copy the memory registers saved in
Operation Messages le-3