If running this test produces the message, “Reset Probe
Configuration” instead of the sample probe resistance and bin
number, the sample probe bin number is not available from the
instrument memory and must be reset. Press SETUP and use the
procedure described in Chapter 1 to preset a random sample probe
bin number such as “5”. Then press TEST and re-run the probe
bin test. Finally, as necessary, press SETUP and use the procedure
described in Chapter 1 to correct the sample probe bin setting. If the
“Reset Probe Configuration” message persists, refer to Chapter
5 to get help.
4. Serial Loop Test
This test performs a continuous check of the serial port.
NOTE Before pressing the START button to begin this test, a tem-
porary jumper connector must be installed on the communi-
cation port (“COMM. PORT”) on the back panel of the 4C3
(see figure 7) to make the following loop-back connections:
On entry, the serial loop test will display “[START] Loop
Ready?”.
Press the START button to run the test. The instrument will begin
to continuously send characters to the communication port and
display a count of the number of characters sent and the number
of overrun/framing errors that occur or will display the message,
“Serial Loop Failed”. After a serial loop failure, the test may be
re-run by pressing the START button.
62
The Advanced
®
Model 4C3 User’s Guide
pin 1 to pin 6
pin 4 to pin 6
pin 2 to pin 3
pin 7 to pin 8
DB-9 Connector
Table 7: Serial Loop Test Connections
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