![background image](http://html1.mh-extra.com/html/keithley/6512/6512_instruction-manual_4063439022.webp)
Operation
2-2
2.3
Power-up self-test and
display messages
2.3.1 RAM memory test
RAM memory is automatically tested as part of the power-
up procedure. If a RAM memory error occurs, the “rr” mes-
sage will remain on the display. If the instrument was not
able to read the stored calibration constants and configura-
tion, the decimal points in the two exponent digits will flash.
If such errors occur, the instrument may be partially or
completely inoperative. Refer to Section 7 for more com-
plete details.
2.3.2 Self-test and firmware revision level
A power-up self-test may be run, and the firmware revision
level may be displayed by pressing and holding the TRIG
button when the unit is first turned on. During the test, all
front panel LEDs and the display segments will turn on as in
the example below:
--1.8.8.8.8.*.*.
The instrument will then display the software revision level
when TRIG is released, for example:
A.1
(The revision level of your unit may be different.)
The instrument will then enter the diagnostic mode, which is
used as an aid in troubleshooting problems within the instru-
ment. See Section 7 for details. Note that the power must be
turned off to remove the instrument from the diagnostic
mode.
NOTE
If the instrument is still under warranty
(less than one year from the date of ship-
ment), and problems develop, it should be
returned to Keithley Instruments for re-
pair. See paragraph 1.7 for details on re-
turning the instrument.
2.4
Front panel familiarization
The front panel layout of the Model 6512 is shown in Figure
2-1. The front panel may be divided into two sections: con-
trols and display indicators. The following paragraphs de-
scribe each of these items in detail.
2.4.1 Controls
All front panel controls except POWER are momentary con-
tact switches. Many control buttons include an annunciator
light to indicate the selected mode. Some buttons have a sec-
ondary function that is entered by pressing the SHIFT button
before pressing the desired button. All such buttons (except
ADJUST) are marked in yellow. The controls are color cod-
ed into functional groups for ease of operation.
1 POWER
The POWER switch controls AC power to the instrument.
Pressing and releasing the switch once turns the power on.
Pressing and releasing the switch a second time turns the
power off. The correct positions for on or off are marked on
the front panel immediately above the POWER switch.
2 SHIFT
The SHIFT button adds a secondary function to some of the
other front panel controls, including VOLTS, TRIG, RE-
CALL, and PROGRAM SELECT. Note that the shift func-
tion is entered by pressing SHIFT before the second button
rather than pressing the two simultaneously.
Summary of Contents for 6512
Page 119: ...Maintenance 7 10 Figure 7 5 Exploded view...
Page 131: ......