Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Performance Check
The following describes
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the function of each test in the program.
Interfaces to user definable keys for recovery from a failed test.
Inputs the primary address of the 492P under test (1 should be used).
ID query response test. The instrument must be able to talk and listen, to send out its ID?
response and manipulate all eight of the'DIO lines for the test to be successful.
Local lock-out test. Tests correct operation of the interface message that should disable all
programmable front panel controls.
Go to LOCAL test. Tests correct operation of the interface message that should enable all front
panel controls.
Group Execute Trigger test. Checks that a GET message does cause the 492P to abort the
present sweep and re-arm the trigger, causing a sweep to start and end, sending out an End-of-
Sweep SRQ. Thus, the SRQ line, as well as the GET message, is verified.
Selected Device Clear Test. This test verifies that an SDC message does indeed reset the
492P’s GPIB output buffer clearing out it’s ID? response.
Device clear test. This test is identical to the selected device clear test, except the universal
command DCL is used instead.
Addressed as listener, talker test. This test checks to see that the 492P microprocessor correct
ly recognized that the GPIA chip has been addressed to listen or talk, and sends the appropriate
character to the crt readout (L or T).
Serial Poll test. This checks correct operation of the serial poll enable (SPE) and serial poll
disable (SPD) interface messages. The status byte is read, and if anything other than ordinary
operation is indicated, the instrument fails the test.
GPIB rear panel switch test. All five primary address switches are checked for correct operation.
Three subroutines are called in the process of testing one address switch. The first two send a
formatted messge to the 4050 display, and the third performs the address switch test.
Line feed or EOI switch test. Checks for correct selection of line feed as a termination when
selected by this switch by sending an ID? terminated only by a line feed.
Talk-only mode test. When selected, this mode should cause the instrument to send a SET?
response and (optionally) a CURVE? response whenever the RESET-TO-LOCAL button is
pressed. The string received from the instrument is thus examined for existence of a portion of
the correct SET? response after the RESET-TO-LOCAL button is pressed.
Listen-only mode test. When selected, this mode will cause the instrument to respond to any
message on the bus, since it is always addressed to listen. The command “REF 0” is sent to the
bus without addressing the instrument, then the listen-only mode is deselected and the instru
ment interrogated to see if it did respond to the REF command while in the listen-only mode.
Interface clean (and Remote Enable) test. This IFC line on the GPIB will unaddress the instru
ment’s interface. This fact is verified by noting that the ‘L’ is not present in the crt readout,
indicating that the IFC line worked; also the REN line will be unasserted when the end statement
is executed (except for some early 4052 and 4054’s). Thus, a front panel in the local mode is
evidence that the REN line was successfully unasserted. (Evidence it was asserted is that the
instrument was able to execute commands sent to it by previous tests.)
REV AUG 1981
3-35
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