2.4.5 Attenuator
The Attenuator selects the responsivity value,
&,
to be the value for the
detector alone or the value for the
detector-with-attenuator.
When AITN
is
ON the AITN annunciator
is
lit and the responsivity of the detector-with-
attenuator
is
used. When AITN
is
OFF, the annunciator
is
off and the detector-
alone responsivity
is
used.
If
the detector does not have an attentuator, or if
USR CAL
is
on (Section 2.4.6) the AITN setting has no effect.
2.4.6 User Calibration
The Model 28324 allows one to create a detector responsivity which over-
rides the responsivities obtained from the detector's calibration module. This
allows one to account for the effects of additional optics and filters in the
measurement path. When USR CAL
is
on, the USR CAL annunciator
is
lit and
the meter adopts the responsivity value displayed by the editable USR RESP
value. Use the PRESENT RESP function to display the current calibration
module responsivity.
The USR RESP units are the same as the PRESENT RESP units. Table 10 lists
the possible user calibration operations.
Table
10
-
User Calibration Operations
Menu Operation Keypad Commands Associated Remote Commands
USR CALlB
ON,
OFF
Edit USR CALlB USRCALn, USRCAL-n?
ON,
off
USR RESP Edit
d.dddEkdd
A/W* USRRESP-n, USERRESP-n?
PRESENT RESP ENTER to view
RES
P-n?
d.dddEMd
A/W*
*These units are not editable.
NOTE
n in a remote command stands for A (channel A) or B (channel B).
2.4.7
DC
Sampling
The Model 28324 incorporates two analog-tdigital,
(A/D)
converters, one
with 20,000 count resolution and a second with 4096 count resolution. The
user may select which
AD will
be
used for both channels during
DC
CONT
and DC SNCL acquisition modes. All other modes use the 4096 count
AID.
The 20,000 count
A/D
converter can operate at sample rates up to 25
Hz.
When two detector calibration modules are plugged into the meter, the 4,096
count
A/D
converter can operate at sample rates up to 500
Hz.
When one
detector calibration module is plugged into the meter, the 4,096 count
A/D
converter can operate at sample rates up to 1000
Hz.
The SAMPLE PREC menu command, Table 11, selects which analog-todigital
converter
is
used for both channels. The sampling frequency for both chan-
nels can be adjusted within the limits imposed by the SAMPLE PREC state, see
Table 12. When the SAMPLE PREC state changes, the sampling frequency
defaults to 25
Hz
if the existing SAMPLE FREQ is incompatible with the new
SAMPLE PREC state. The SAMPLE FREQ and the SAMPLE PREC settings affect
both channels, not just the display channel.
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