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Signal Output
Zeroing signal output
70
Self-
ZERO
setpoint
Referencing Figure 5•2for the +1 V output, note that using
ZERO
can
increase dynamic range available for signal output by shifting an existing
constant offset signal to a lower level (usually electrical zero). There are
limits to this, however, so it is good practice to have background reduced
as much as possible by minimizing column bleed, using clean supply
gases, and by performing proper detector maintenance.
1.0 V maximumoutput level
+ 1.000 V
+ 0.100 V
-0.010 V
0V
HP 5890 SERIES II electrical zero
Constant 0.100 V
detector background
signal
pressed
0.9 V usable
dynamic range
1.0 V usable
dynamic range
ENTERZERO
O
U
T
P
U
V
O
L
T
A
G
E
T
1 V Output: Canceling Baseline Offset (the self- function)
Effect of on the +1 V Analog Output
Figure 5-2
ZERO
ZERO