Model
8901B
Operation
Peak
Hold Mode
When the peak hold mode
is
selected, the limited rise time
of
the peak detector circuitry can cause a
slight measurement error for narrow, one-time modulation transients.
To
prevent this error, repeat the
peak-generating process several times while leaving the peak hold mode active.
If
PEAK HOLD
is
selected while the average or true
rms
detector mode
is
active, the detector will
switch
to
the peak detector mode previously selected.
If
PEAK HOLD
is
selected while the peak-average
(PEAKf/2) mode
is
active, the detector reverts
to
PEAK+ with PEAK HOLD.
HP-IB
In remote operation, new peak-hold cycles can only be initiated by code
D3.
Thus,
if
the instrument
is
in HP-IB Hold mode (code Tl), issue code
D3
to
initiate a peak-hold cycle. Although the display
cannot be updated when in HP-IB Hold, the peak
is
captured, stored and updated. Upon leaving
HP-IB hold via the triggering codes
(T2
or
T3),
the
data
output represents the greatest peak captured
since the peak-hold cycle was initiated.
Audio Detectors 3-175
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