Self• Setpoint - HP 5890 Series II Plus Reference Manual

Signal Output
Zeroing signal output
Self-
Referencing Figure 5•2for the +1 V output, note that using
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.
Figure 5-2
+ 1.000 V
O
U
T
P
U
T
V
O
+ 0.100 V
L
T
A
G
E
0 V
-0.010 V
70
setpoint
ZERO
1 V Output: Canceling Baseline Offset (the self-
1.0 V maximum output level
0.9 V usable
dynamic range
ZERO
Constant 0.100 V
detector background
signal
Š
HP 5890 SERIES II electrical zero
Effect of on the +1 V Analog Output
ZERO
ENTER
pressed
ZERO
ZERO function)
1.0 V usable
dynamic range
can