Hardware Error Messages - HP 8642A Operation And Calibration Manual

Model 8642A/B
Operation
Operating Messages (cont'd)
Hardware Error Messages
Local: These messages are all queued up and can be displayed using the [ MSSG ) key.
HP-IB: All of these messages are output via HP-IB using "OH". (Some out-of-Iock messages are also
output using "0H"; refer to page 3-197.)
Hardware Error messages (message number is prefixed with "H") signal the presence of either an internal
circuit hardware problem or a firmware problem that you might be able to resolve. Hardware Error
messages may occur independently of function execution. A maximum of 20 Hardware Error messages
can be queued up to be accessed either by the [ MSSG ) key on the front panel, or via HP-IB using "OH".
If you are unable to repair the hardware error, refer to the Service Manual for more information.
HIT AMPTD=CLEAR RVS.PWR .Hl
7001
Press the [ AMPTD ) key to reset the reverse-power-protect circuitry. A reverse-power condition has
been sensed. After this condition is eliminated, select the ( AMPTD I kflY to reset the protection circuitry.
HP-IB: Send AP after the condition is eliminated. Message H2 will always occur after the
reverse -power-protect circuitry is reset in response to message HI.
R VS.PWR PROTECT CLEARED .H2
7002
The reverse-power protect circuitry was previously tripped but is now reset.
RECALL ERROR FOUND .HI0
7010
A recall error has been found. This message could be due to a hardware failure (for example, loss of RAM
memory). The message means that a recall register that was recalled had no instrument settings saved in
it. The register could have been cleared with Special Function 251 (Clear Recall Registers) or because of a
hardware error. This error HI 0 occurs in conjunction with execution error E93. Refer to "Recalling an
Undefined Register" on page 3 -162 for more information.
MSSG BUFFER OVERFLOWED .Hll 7011
The message buffer has overflowed. Some messages were lost.
lOMHZ REF. OVEN COLD .H20 7020
The oven for the 10 MHz reference (installed with option 001) is cold. The frequency reference could be
unstable until the oven is warm. When the oven cold condition no longer exists, an attempt to scroll
through the message list twice will not display the message the second time. (Refer to "Queued Up
Messages" on page 3-180 for an explanation of the purpose of scrolling through the message list twice.)
Also note that when this message is available, the Knob might not operate in the normal way.
3-193