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Signal Output
A standard signal channel, controlled via
SIG 1
, always is provided.
A second signal channel, controlled via
SIG 2
, is provided if Option 550/
Accessory 19242A (Communications Interface Board ), or Option 560/
Accessory 19254A (RS•232), is installed.
Output sources include detector signal(s), heated zone or oven
temperatures, carrier gas flow rates, column compensation run data, or
test chromatographic data. If both signal channels are present, each may
output information simultaneously from the same source, or from two
different sources.
For either channel, two separate levels of ANALOG output are provided,
depending upon the analog signal cable used: +1 V or 1 mV.
0 to +1 mV: for strip chart recorders.
-0.01 to +1 V: for electronic integrators with analog inputs.
The two output levels are independent, and may be connected
simultaneously to separate data•receivingdevices.
Note: A tick mark (electrical pulse) is produced at the +1 mV analog
output when either
START
or
STOP
is pressed, and when a run
times out (run time elapses). These marks locate beginning and ending
points in a chromatogram plotted at a continuously running strip chart
recorder.
Zeroing signal output
Acting on +1 mV and +1 V analog outputs,
ZERO
defines a constant
offset which is then subtracted from the output signal (prior to signal
attenuation by
RANGE 2 ()
or
ATTN 2 ()
).
