IEEE-488 Option -05 7

General Maintenance

7-7. IEEE-488 Transceivers/Connector

The IEEE-488 Transceivers (A5U2 and A5U3) are octal transceivers that are specifically designed to exhibit the proper electrical drive characteristics to meet the IEEE-488 standard. These transceivers are configured to match the control signals available on the IEEE-488 Controller. Assuming that A5U1-33 is always high, Table 7-2 describes the transceiver direction control. The IEEE-488 Transceivers connect to a 24-position connector (A5J2), which mates with the ribbon cable leading to the IEEE-488 connector mounted at the rear of the instrument chassis.

Table 7-2. IEEE-488 Transceiver Control

TRANSCEIVER

DI01..DI08

SRQ

ATN

EOI

-

DAV

NRFD

NDAC IFC REN

TE = 0 (LISTENER)

Receiver

Transmitter

Receiver

Receiver

Receiver

Receiver

Transmitter

Transmitter

Receiver

Receiver

TE = 1 (TALKER)

Transmitter

Transmitter

Receiver

Receiver (ATN = 0)

Transmitter (ATN = 1)

Transmitter

Receiver

Receiver

Receiver

Receiver

7-8. General Maintenance

7-9. Removing the IEEE-488 Option

Remove the instrument cover as shown in Figure 7-1. Then remove the IEEE-488 Option with the following procedure:

Note

Parts referenced by letter (e.g., A) are shown in Section 3 (Figure 3-4.)

1.From the bottom of the instrument, locate the IEEE-488 PCA (N). This pca is connected to the front of Main PCA, with a ribbon cable (O) leading across both pca’s to the Rear Panel. Refer to Figure 7-1.

2.Use needle nose pliers to disconnect the 24-line cable assembly at the IEEE-488 PCA, alternately pulling on each end of the cable connector. Leave the other end of this cable attached to its Rear Panel connector.

3.Remove the 6-32, 1/4-inch panhead Phillips screw (P) securing the IEEE-488 PCA. See Figure 7-1.

4.Disengage the IEEE-488 PCA by sliding it away from the Main PCA.

7-5

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Fluke 2625A, 2635A IEEE-488 Transceivers/Connector, Removing the IEEE-488 Option, IEEE-488 Transceiver Control
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2635A, 2625A specifications

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