DMM4050 MANUAL PDF

Programmer Manual. All rig hts res erved. L icensed softwa re produ cts are owned by Tektron ix. Tektronix pro ducts a re cov ered by U.

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All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.

Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved. Contacting Tektronix, Inc. Bookmark not defined. A Introduction B Incompatible Fluke 45 Commands C Network Primer C Network Interconnection Devices D Device Dependent Command Set This manual describes how to setup, configure, and operate the Meter through each of the remote interfaces.

Detailed information on the SCPI command set, and how the Meter processes those commands is included in this manual. Fluke 45 command limitations are covered in Appendix B and Fluke A command limitations are covered in Appendix D in this manual. Note For more information regarding the SCPI programming language, visit A free copy of the SCPI standard can be found at The level of detail in this chapter is based on the assumption that the reader is familiar with the basics of data communication interface, and the IEEE bus.

Safety Information This section addresses safety considerations and describes symbols that may appear on the Meter or in the manual. A W Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected.

Important information. See manual. X Hazardous voltage. Static discharge can damage parts. Local and Remote Operation When the Meter is operated from a host, it is said to be operated remotely. When operated from the front panel, it is said to be operated locally.

Most operations that can be performed locally can also be performed remotely over the remote interface. Some operations, like setting communications parameters for the 5. XW Warning To avoid electric shock, turn off the signal source to the Meter before touching the test leads.

The front panel display may not indicate the true input voltage while in remote mode. Always assume lethal voltages exist on the front-panel inputs. Only one remote interface can be enabled at a time. Using any of the interfaces turns the Meter into a fully programmable instrument that can be integrated into an automated instrumentation system. Note The remote interface port and settings can be changed only through the Meter s front-panel controls.

Enabling or selecting a port for remote operation is a separate process from setting the various parameters associated with a remote interface. An interface does not have to be selected to set its parameters; for example, the baud rate of the RS port can be set while the Meter has the LAN port enabled as the remote control port. This is particularly true if you want to collect a large number of samples per measurement. Set up all of the parameters i.

Use the internal trigger. Set the trigger delay to zero. Turn off the display. If operating with RS, use the fastest baud rate available. This may slightly improve reading rate. Note For any sample count greater than 1, measurements are returned comma separated. Press I. Port selection is non-volatile. Therefore, the selected port will remain active until another port is selected through the front panel.

The maximum length of IEEE cable used on a single IEEE system must be the lesser of 20 meters, or 2 meters times the number of devices in the system. This can only be done through the Meter s front panel. A controller uses an address between 1 and 32 to identify a specific instrument on the bus. To change the IEEE address: 1. The IEEE document describes and codes the standard bus features, so that manufacturers may give brief coded descriptions of their own interfaces overall capability.

The codes that apply to the Meter are given in Table 1 below, together with short descriptions. These codes conform to IEEE requirements.

Table 1. The following sections describe the process of configuring the RS port. To make the RS port the active port for remote operation, see the Selecting the Remote Interface Port section above. Table 2 lists the RS parameter settings when the Meter leaves the factory.

Table 2. Press the RS C soft key. At this point, all the RS settings are made available. Note All RS port parameter settings are non-volatile and remain set until changed. There are eight pre-defined settings: , , , , , , , and These selections are displayed in two separate menus. When first entering baud rate selection, baud rates to are displayed. To get to the next five higher baud rates, press MORE. To get back to the lower baud rates, press B. With the desired baud rate displayed, press the soft key under the chosen baud rate.

Press the soft key under the desired parity, and data bit parameter. Press the soft key under the desired flow control. Press the soft key labeled with the desired End-Of-Line character s. Enabling and Disabling Fluke 45 Emulation Echo Although you can turn echo on or off at anytime, the selection is only used or changed when the Meter s command mode is set to Fluke 45 emulation. To enable or disable Echo for the RS port: 1. Switching between these two command languages is covered in the Selecting the Programming Language section later in this manual.

The following sections explain the differences in communications protocol and how to set the Meter and computer parameters for proper operation. The terminal mode is an interactive mode where an operator inputs commands, with immediate returns for requested information queries and interface messages. A backspace is echoed to the host terminal.

The computer mode is used when the Meter is operated by computer program. In this mode, requested information is returned by query, and interface messages are queued and returned by command. Characters are not echoed on the host computer and command prompts are suppressed.

To select computer or terminal mode from the front panel: 1. In Echo mode, characters sent to the Meter are echoed on the host s display screen. In No Echo mode, characters sent are not echoed. To set the echo parameter, refer to the "Enabling and Disabling RS Echo" section earlier in this manual.

A backspace is echoed to the display screen if Echo On mode is set. In either mode, when the host sends a command to the Meter over the RS interface, the Meter parses and executes the command, and returns a response if appropriate, and sends one of three prompts: The command was not executed because it was not understood. For instance, this prompt would be returned if the Meter was sent an input string that contained a syntax error.!

The command was understood but not executed i. For instance, this prompt would be returned if you attempted to use the decibels modifier db on a frequency measurement FREQ. Press the RS C softkey. Set the baud rate to as follows: 1. Press I 2. Press the softkey. Set the RS port to non-echo as follows: 1. Press the IEEE softkey. Set the IEEE address to a system compatible value as follows: Use the soft keys to set the address as follows.

To set the Meter to Fluke 45 emulation: 1. Interconnections The Meter communicates with a host through a DB-9 interface connector on the rear panel of the Meter. Connect the Meter to the host or terminal using a cable appropriate to your application that is less than 50 feet 15 meters long. Longer cables are permitted, providing that the load capacitance measured at the interface point including the signal terminator does not exceed picofarads.

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