Yokogawa BT200 - Manual (Page 46)

7-2
<Toc> <Ind> <7. TROUBLESHOOTING>
IM 01C00A11-01E
3. THE BATTERY INDICATOR IS ON
The BATTERY indicator, when on, warns you of a low
battery voltage. Replace with new batteries having a
specified voltage (1.5 V) as soon as possible. The
BT200 could stop operating at any moment if you
continue to use it.
4. THE BT200 STOPS WITH THE COMMUN.
ERROR INDICATION ON
The BT200 needs to communicate with the connected
instrument in order to function. It doesn’t operate by
itself. This problem suggests that communication
between the BT200 and the connected instrument is
disabled.
(1) Are the BT200 and the instrument wired as in-
structed in the relevant instruction manuals?
Check again to make sure.
(2) Is the connected instrument switched on? Is it
operable?
Check again to make sure.
(3) Is a reception resistor of 250 ohms or higher
inserted in series in the current output circuit of the
connected instrument? If you are using our
distributor to power the connected instrument, a
reception resistor is built in it.
(4) Does the wiring distance of the current output cable
of the connected instrument exceed 2 km(1.24
miles)? Is a capacitor in excess of 0.22
␮ F inserted
in parallel with the current output cable of the
mating instrument?
In either case, the communication signal components
are bypassed by the electrostatic capacitance,
disabling communication. Check again to make sure.
(5) Is the communication cable for the BT200 broken?
If a spare cable is available, replace it. If not, use a
multimeter to check for breakage with reference to
the connections shown below. (Figure 7.2)
6. SELF CHK ERROR INDICATION IS ON
The SELF CHK ERROR indication, when on, suggests
that a setting is out of range or a fault exists. Press [F2]
DIAG on the parameter panel to check the settings. For
detailed definitions of the diagnostic messages and the
associated actions, refer to the user’s manual for the
connected instrument