Rigol DM3068, Руководство по обслуживанию

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RIGOL Chapter 5 Troubleshooting & Maintenance
Service Guide for DM3068
5-2
CAUTION
Cut off power connection before replacing the fuse.
The new fuse should meet the specification requirements in this guide.
2. Self-test failed:
(1) Check the voltage selector if proper scale is selected.
(2) Disconnect all inputs and restart the self-test. Although the meter
automatically cuts off the connection with input signal while self-testing, ac
signals from the input terminal may still enter the meter and cause test
failure, consequently, manually disconnect all inputs is necessary before
self-testing.
3. Readout unstable and large offset is generated from small
capacitance measurement:
(1) Check if a shielded cable is used when measuring small capacitance.
(2) Disconnect the measured capacitance and use “REL” operation to clear zero
offset.
4. Current measurement does not work:
(1) Check the connections of the current input terminals.
(2) Check the current input fuse.
5. Readout is stable and non-zero when HI-LO is shorted under voltage
measurement:
(1) Disable all math operations.
(2) Set the integration time to 100 PLC and enable Autozero.
(3) Check the voltage selector if proper scale is selected.
(4) Make sure your meter has been warmed up as requested.
6. Dark in screen backlight:
(1) Regulate the backlight brightness and contrast.
(2) Refer to “Screen” in 5.2.4 Replaceable Part list.
7. Cannot use RS-232 interface to connect with the meter
(1) Check if the serial ports assigned by both the meter and host are
compatible (refer to the Interface Configurations of the User’s Guide for
DM3068).
(2) Check the connection of the serial cable.
(3) Check the connections of RXD and TXD terminals of the serial cable.
(4) Try to disable the print function if a command is desired for the meter
control.
8. Cannot connect to the meter through GPIB interface:
(1) Check if the GPIB address is correct (refer to the Interface
Configurations of the User’s Guide for DM3068).
!