Fluke 2680A Service Manual page 134

268XA
Service Manual
2. Wire the Universal Input Module so the high and low inputs to channels 1 and 11 are
3. Power the device and allow at least a 30-minute warm-up period. The device must be
4. Using the buttons at the device front panel, set the desired baud rate for the device
5. Activate the calibration mode for a particular module by sending the command
5-4
externally available. In addition, a four-wire short must be applied to channels 2 and
12. (See Figure 5-2.) Plug the module into the device.
stabilized in an environment with an ambient temperature of 22 to 24 C and relative
humidity of less than 70%.
RS-232 port (see below). This is the only selectable RS-232 parameter. The other
device RS-232 parameters are fixed: data bits=8; stops bits=1; parity=none;
echo=none; flow control=xon/xoff.

Press the COMM key to review the baud rate, or press and hold the COMM
key for 3 seconds to set the baud rate (the SET annunciator lights).

Press the up/down arrow keys until rS232 is shown in the primary display

(comm is displayed in the secondary display).

Press the ENTER key. bAud is displayed in the secondary display and the
current baud rate in the primary display.

Press the up/down arrow keys to select the desired number baud rate:

4800, 9600, 19200, or 38400. The factory default value is 9600 baud.

Press the ENTER key to exit. (Pressing any other function key will cancel set
operations.)
CAL_MODE SPLUNGE. CAL should show on the primary display. You are now
ready to start calibrating a module. Setup the PC in terminal mode (see the section on
Manual Calibration Procedure) and then use the calibration commands to work
through the procedures (see section on Manual Calibration Commands) .