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SECTION 3
frequency. These signals can be used for scale ad-
justments of XY recorders.
STOP STATE (Stop frequency outputi
[SHIFT1
STOP STATE performs the opposite function
of
the START STATE key in that it sets the output
frequency to the stop frequency.
When STOP STATE is pressed, the MKR OUT
and SWEEP SYNC OUT signals on the rear panel
are set high. The X DRIVE OLIT signal is set to OV
when the start frequency is higher than the stop
frequency;
it is set to 1OV when the start fre-
quency is lower than the stop frequency.
HOLD/RESM
(Hold/resume: temporary sfop and
resume)
This key alternately
stops and resumes the
SW-?+
Pressing HOLD/RESM
while sweep is in pro-
gress will
halt the sweep with
the frequency,
MKR OUT, SWEEP SYNC OUT, and X DRIVE
OUT signals present at that time maintained
at
their present
values.
Pressing
HOLD/RESM
with the sweep halted resumes the sweep with
signal
conditions
previously
present
main-
tained.
ENTRY (Main parameter setting keys)
FREQ &quency)
[MODIFY]
[SIZE]
The FREQ key allows you to set the output fre-
quency of the unit. The allowed frequency range
is between O.OOOlHz and 1,ZOOkHz (l.ZMHz)
for
the%
and n waveforms (with50%
fixed duty
cycle); the range is from O.OOOlHz to 1OOkHz for
all other waveforms.
Note that the 1OOkHz re-
striction for the n
waveform
applies only with
a variable duty cycle; you can set the frequency
to amaximumof
l,ZOOkHzwitha50%
fixedduty
cycle. Also, you can set the frequency
to a maxi-
mum of 1,ZOOkHz with the 2/
, /l
, and \
waveforms
if the quality of the waveform
is un-
important.
The oscillation frequency can be programmed
in
frequency
units or time period
units. The al-
lowedrangeforperiodunitsisfrom0.00084msec
to
lO,OOO.Osec (1,ZOOkHz
limit)
or
from
0.01000msec to 10,000.0sec (100kHz limitation).
For period-based
settings, the frequency is set to
the value of the reciprocal that is rounded to the
nearest number below O.lmHz. Therefore,
pe-
riod-based
setting will cause significant
errors
when the number of digits for the value of the re-
ciprocal that is rounded
is small. For example,
values of either lO,OOO.Osec or 6,000.OOsec will re-
sult in a frequency of O.OOOlHz.
If you press FREQ during
sweep operation
or
during sweep hold, the current frequency willbe
displayed, but you will not be able to change the
frequency.
Note that the phase of the waveform
is continu-
ous even when the frequency is changed.
AMFTD
(Amplitude)
[MODIFY]
[SIZE]
Pressing AMPTD
allows you to set the output
amplitude
of the unit. The allowed
amplitude
when the DC offset is OV ranges from 0.3OmVp-p
to 3O.OOVp-p when the output range mode is set
to automatic
(AUTO), or from OV to 3O.OOVp-p
when the output
range mode is fixed (FXD).
When the DC offset is not OV, the upper and
lower limits are restricted (see specifications
in
Appendix
B). The values for the amplitude
set-
ting are for no-load (open) output conditions.
When the output range mode is AUTO, the am-
plitude setting can be specified using rms or dBV
units in addition
to using p-p units. You can
specify the appropriate
units by pressing the ap-
propriate
ENTER units key when entering the
amplitude.
Use mV or V for p-p values, mVrms
or Vrms for rms values, or dBV for dB values.
Note that p-p values are the only permissible
units for DC waveforms,
and that the p-p value
varies from one waveform to another if you spec-
ify the amplitude
as an rms or dBV value. Also
note that the amplitude
set by the AMPTD key is
the amplitude
of an AC waveform. Set the ampli-
tude of a DC waveform
type with the OFFSET
key.
OFFSET (DC offseti
[MODIFY]
[SIZE]
The OFFSET key enables DC offset voltage pro-
gramming.
The allowed offset is between -15V
and 15V for a DC waveform. For other waveform
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