Agilent Technologies 4288A User Manual

52 Chapter 5
Starting (Triggering) Measurement and Waiting for Completion of Measurement
Starting (triggering) Measurement
Starting (triggering) Measurement
Trigger system
The operations performed by the trigger system include detection of the measurement start
signal (trigger) and control of the delay time for starting measurement. The trigger system
has three states: “idle,” “waiting for trigger,” and “measurement,” as shown in Figure 5-1.
Figure 5-1 Trigger system
Each state of the trigger system and the transitions between them are described below.
Idle state
When the following commands are executed, the trigger system transitions to the idle state
(e in Figure 5-1). The idle state is also in effect immediately after power-on. Because the
continuous activation of the trigger system and the trigger mode are set to ON and internal
trigger, respectively, at power-on, the trigger system immediately transitions to the waiting
for trigger state and then repeats the transition between the measurement state and the
waiting for trigger state.
• *RST on page 126
• :ABOR on page 130
When the trigger system is started up using the following commands, it transitions to the
waiting for trigger state (a in Figure 5-1).
• :INIT on page 183
• :INIT:CONT on page 183 (when executed with ON specified)

Agilent Technologies 4288A Specifications

General

Frequency Range	20 Hz to 1 MHz
Basic Accuracy	0.1%
Display	LCD
Frequency	20 Hz to 1 MHz
Maximum AC signal level	2 Vrms
Interface	GPIB, RS-232
Measurement Parameters	C, L, R, D, Q
Input Impedance	1 MΩ
Power Requirements	100 V to 240 V, 50 Hz to 60 Hz
Measurement Type	Capacitance (C), Inductance (L), Resistance (R), Dissipation Factor (D), Quality Factor (Q)
Bias Current	0 to +100 mA (programmable)

Summary

2 Overview of Remote Control

Setting Up a GPIB Remote Control System

Explains how to set up a GPIB remote control system for the Agilent 4288A.

3 Setting Up Measurement Conditions and Display

Setting Up Measurement Conditions

Details how to configure measurement parameters like frequency, range, time, averaging, and trigger delay.

4 Preparation for Accurate Measurement (Executing Compensation)

Executing OPEN/SHORT/LOAD Compensation

Details the process of performing OPEN, SHORT, and LOAD compensation for accurate measurements.

Using the Multi-compensation Function

Enables and configures multi-compensation for multiple channels or parameters.

5 Starting (Triggering) Measurement and Waiting for Completion of Measurement

Starting (triggering) Measurement

Describes the trigger system states and methods for starting measurements automatically or on demand.

Waiting For Completion Of Measurement (detecting completion of measurement)

Explains detecting measurement completion using SRQ and status registers for program flow.

6 Reading Out Measured Result

Reading out measured result using *TRG command

Describes using *TRG to trigger measurement and immediately read results.

Reading out measured result using :FETC? command

Explains using :FETC? for triggering and reading results, suitable for external controllers.

Reading out measured result using :READ? command

7 Sorting Based on Measured Result (Comparator Function)

Setting Up Comparator Function

Explains enabling the comparator and configuring limit ranges for sorting measurements.

Rejecting Excessively Low Measured Results (Low C reject function)

8 Avoiding Mistakes Related to Work and Daily Checks

Avoiding Improper input from the front panel (key lock function)

Detecting the occurrence of an error

Explains methods for detecting errors using the error queue and status report system.

Daily Checks (executing the self-test)

9 Measurement Applications (Sample Programs)

Measurement with Auto-sorting System

Measurement with changing channels (scanning)

B Information for Replacing 4278A with 4288A

Functional Comparison and GPIB Command Correspondence

Compensation

Compares compensation functions (ON/OFF, parameter format, standard setup, alarm messages).

Multi-compensation

Comparator

Compares sorting parameters, limit modes, BIN sorting, AUX BIN, and Low C reject functions.

C Status Reporting System

General Status Register Model

D Initial Settings

Initial Settings, Settings that can be Saved/Recalled, Settings that can be Backed Up

Provides initial, save/recall, and backup settings for instrument configuration.

E At-a-glance Table of Operations When Overload or Low C is Detected

Operations when overload/Low C is detected

Describes display, GPIB, and handler interface outputs for overload or Low C conditions.

F Error Messages

Error Messages

Lists error messages and their remedies, ordered by error number.

Warning Messages (WARNING)

G 4268A vs. 4288A GPIB Command Correspondence Table