BG 805 981 BE (0201) QMG422.oi
55
Examples of unsuccessful fine searches:
l
max
l
min
+1,5%
l
1
l
1
-1,5%
l
1
+1,5%
–1/8
MASS
+1/8
l
max
-1,5%
On the QC 422 there are some signal connections (see pin assignment
15).
Nowadays measurement data are generally acquired with computers. For
investigating possible measuring problems (noise, transient response, etc.) and for
special cases the analog signals can be very useful.
Analog filtered electrometer signal. It can be readily evaluated only in
amp-
MODE:FIX
(Fixrange). With
Autorange
it becomes difficult to follow.
elm
is highly
suitable for assessing the quality of the raw measured values. The calibration factor
CALIB
has no influence on
elm
.
Monitor sequentially supplies the measurement signals of all measurement
channels after they have been processed by the signal processor. It also serves as
the analog output of the ion counter and can be used in linear or logarithmic format.
The AO/IC 421 option can output up to twelve analog measured values in linear or
logarithmic format.
You can assign one or several measurement channels (
output-AO-CH
) to each of
the twelve AO channels. If several measured values are assigned to the same AO
channel they will be output sequentially.
Via the computer interface also data from the PC software can be output on the
AO 421.
Indicates the start of the measurement and is suitable for triggering an
oscilloscope.
Proportional to the momentary mass number
0...10.24 V for QMH 400/410; 0 ... 10.00 V for QME 125
The behavior of the above signals in the various operating modes is described
beginning on
50.
The measured values at
mon
and
AO
have the following formats:
LIN
Linear
LOG 3D
Logarithmic across 3 decades
LOG 8D
Logarithmic across 8 decades
LOG
Logarithmic across 3 or 10 decades
The possible choices (operating mode dependent) can be found in the following
tables, the scaling from the corresponding formulas and diagrams.
The formulas and graphics apply to positive measurement signals.
In the negative range the characteristics are mirror imaged at the zero according to
the formulas a) ... e) and n) ... q)
Note:
log = log
10
Uo = U
output
at
mon
or
AO
Mass units:
U: [V] I: [A]
Counting rate: [cps] counts per second, s
-1
6.13 Analog outputs
Connectors
elm
mon
AO
sync
scan
Output formats
