Section 2: General operation Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-84 2657A-901-01 Rev. B/December 2012
To connect the instrument to the IEEE-488 bus, line up the cable connector with the connector on the
rear panel. Install and tighten the screws securely, making sure not to overtighten them. The following
figure shows the location of the connector.
Figure 28: IEEE-488 connections
Connect any additional connectors from other instruments as required for your application. Make sure
the other end of the cable is properly connected to the controller. You can only have 15 devices
connected to an IEEE-488 bus, including the controller. The maximum cable length is either two
meters (6.5 feet) multiplied by the number of devices or 20 meters (65.6 feet), whichever is less.
Erratic bus operation may occur if you ignore these limits.
Primary address
The Model 2657A ships from the factory with a GPIB primary address of 26. If the GPIB interface is
enabled, it momentarily displays the primary address on power-up. You can set the address to a
value from 0 to 30, but do not assign the same address to another device or to a controller that is on
the same GPIB bus (controller addresses are usually 0 or 21).
To set or check the primary address from the front panel:
1. Press the MENU key, then select GPIB, and then press the ENTER key or the navigation wheel
.
2. Select ADDRESS, then press the ENTER key or the navigation wheel .
3. Use the navigation wheel to set the primary address to the appropriate value, then press the
ENTER key or the navigation wheel .
4. Press the EXIT (LOCAL) key twice to return to the normal display.
Instrument
Controller
Series 2600B
Model 707B/708B
Model 2657A
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