HP 5890 Series II Plus Reference Manual page 71

Signal Output
Zeroing signal output
Figure 5-3
O
+ 1.000 mV
U
T
P
U
T
V
O
L
T
+ 0.100 mV
A
G
E
+ 0.006 mV
0 mV
The example in Figure 5•2is in terms of the +1 V analog output. In
Figure 5•3,identical treatment is made for the +1 mV output, except that
the signal is shifted to an offset somewhat above electrical zero. This
ensures a small positive offset (about 6% of full scale) in pen position at a
connected chart recorder, and permits uninterrupted plotting, even if a
small negative baseline drift occurs.
Once current
channel, pressing
signal value.
Self•
activity (i.e., not during a run). To do so during an active run may cause a
baseline shift at the recording/integrating device.
1 mV Output: Canceling Baseline Offset (the self-
1.0 mV maximum output level
0.9 mV usable
dynamic range
ZERO
Constant 0.1 mV
detector background
signal
HP 5890 SERIES II electrical zero
Effect of ZERO on the +1 mV Analog Output
setpoint value is displayed for the desired signal
ZERO
ENTER
should be done only at times of quiet chromatographic
ZERO
ENTER
pressed
causes the value to be changed to the current
function)
ZERO
1.0 mV usable
dynamic range
71