Agilent Technologies 6890 Series User Manual

Signal Handling
Digital data handling
158
Store signal value Saves the value of the signal at the time of the
command.
Sig zero - value Creates a new zero by subtracting the stored value from
the current value of the signal and applies this zero to all future values.
When these commands surround a baseline-shifting command, the effect is to
bring the new baseline to the previous level, as shown in Figure 24.
The Store event must occur before the event that shifts the baseline, and the
zero - value event must occur after the baseline has stabilized at the shifted
level.
Figure 24 Correcting baseline level shifts in digital signals
Baseline level change
Baseline-shifting event occurs
No correction
Signal
Signal
Run time correction
3. Sig zero – val event occurs
Time
2. Baseline-shifting event occurs
1. Store signal value event occurs
Time

Agilent Technologies 6890 Series Specifications

General

Brand	Agilent Technologies
Model	6890 Series
Category	Laboratory Equipment
Language	English

Summary

The 6890 Series Gas Chromatograph

Control Tables

General Warnings

Covers safety precautions related to dangerous voltages, static discharge, and hot parts.

Shutting Down the GC

The Keyboard and Display

The Keyboard

Flow and Pressure Control

Part 1. Electronic Pneumatic Control (EPC)

Details EPC functions including readings interpretation, configuration, columns, detectors, and calibration.

Measuring Flow Rates

Flow and Pressure Problems

Troubleshooting common issues related to gas flow and pressure control in the GC.

The Column Oven

Oven Configuration and Operation

Temperature Programming

Explains single and multiple ramp temperature programs for achieving desired oven profiles.

Fast Chromatography Options

Cryogenic Operation

Columns and Traps

Capillary Columns

Information on capillary column installation, preparation, and types.

Packed Metal Columns

Details on installing packed metal columns, related fittings, and preparation.

Packed Glass Columns

Covers the overview and installation procedures for glass packed columns.

Signal Handling

Signal Control Tables

Analog Output Settings

Covers adjusting zero, range, and attenuation for analog output signals for recorders.

Column Compensation

Instrument Automation

Executing Events During the Run

Covers programming timed events using run time and clock time tables.

Run Time Programming

Allows setpoints to change automatically during a run based on chromatographic run time.

Clock Time Programming

Allows setpoints to change automatically at specified times during a 24-hour day.

Analytical Methods

Understanding and Using Methods

Creating and Managing Methods

Step-by-step procedures for creating, storing, loading, and deleting methods.

Method Mismatch

Valve Control

Valve Control

Covers manual and programmed control of valves, valve drivers, and internal/external drivers.

Valve Configurations

Valve Control Examples

The Automatic Liquid Sampler

Part 1. The 7673 ALS

Information on configuring and using the 7673 ALS automatic liquid sampler.

Part 2. The 7683 ALS

Information on configuring and using the 7683 ALS automatic liquid sampler.

Analytical Sequences

Sequence Definition and Components

Creating Sequences

Managing Sequences

Sequence Control

Details sequence status, starting, pausing, stopping, and aborting analytical sequences.

Messages

Not Ready Messages

Shutdown Messages

Fault Messages