Teledyne 6200E - Sulfides Analyzer - Manual (Page 91)

Model 6200E Instruction Manual Operating Instructions
M6200E Rev: A1 91
6.9.4.4. Analog Output Offset Adjustment
Some analog signal recorders require that the zero signal is significantly different from the baseline
of the recorder in order to record slightly negative readings from noise around the zero point. This
can be achieved in the M6200E by defining a zero offset, a small voltage (e.g., 10% of span),
which can be added to the signal of individual output channels by activating the ANALOG I/O
CONFIGURATION MENU (see Section 6.9.1), then pressing:
DIAG AIO RECORD OFFSET: 0 MV
+ 0 0 0 0 ENTR EXIT
DIAG ANALOG I / O CONFIGURATION
PREV NEXT ENTR EXIT
DIAG AIO AOUTS CALIBRATED: NO
< SET SET> CAL EXIT
FROM ANALOG I/O CONFIGURATION MENU
DIAG AIO CONC_OUT_2 RANGE: 5V
SET> EDIT EXIT
Set the recorder
offset (in mV) of
the selected
channel
DIAG AIO CONC_OUT_2:5V, CAL
< SET SET> EDIT EXIT
DIAG AIO CONC_OUT_2 REC OFS: 0 mV
< SET SET> EDIT EXIT Pressing ENTR accepts the
new setting and returns to the
previous menu.
Pressing EXIT ignores the new
setting and returns to the
previous menu.
Press SET> to select the
analog output channel to
be configured. Then press
EDIT to continue
6.9.4.5. Current Loop Output Adjustment
A current loop option is available and can be installed as a retrofit for each of the analog outputs of
the analyzer (Section 5-2). This option converts the DC voltage analog output to a current signal
with 0-20 mA output current. The outputs can be scaled to any set of limits within that 0-20 mA
range. However, most current loop applications call for either 2-20 mA or 4-20 mA range. All
current loop outputs have a +5% over-range. Ranges with the lower limit set to more than 1 mA
(e.g., 2-20 or 4-20 mA) also have a -5% under-range.
To switch an analog output from voltage to current loop after installing the current output printed
circuit assembly, follow the instructions in Section 6.9.4.1 and select CURR from the list of options
on the “Output Range” menu.
Adjusting the signal zero and span values of the current loop output is done by raising or lowering
the voltage of the respective analog output. This proportionally raises or lowers the current
produced by the current loop option.
Similar to the voltage calibration, the software allows this current adjustment to be made in 100,
10 or 1 count increments. Since the exact current increment per voltage count varies from output