The following front-panel buttons are active during normal instrument operation.
For full details on all standard run-time procedures—including peak capture, tare,
and printout—see Section 5.
When this button is pressed while the 3500 instrument is in RUN-TIME MODE,
the operator will be asked to enter the current SECURITY CODE (or to enter a
new code, if it is currently "0"). Once the correct security code has been entered,
the instrument will be placed in SETUP MODE, and the display shown in Fig. 1(b)
will appear. The button will remain lit as long as the instrument is in the SETUP
MODE. While in SETUP MODE, the SETUP button is used to exit the current
setup procedure or to exit SETUP MODE altogether.
When the "PEAK" logic input terminal is disconnected (i.e., at the "Logic 0" level),
pressing the PEAK/TRACK button once will place the 3500 instrument in the
"+PEAK" MODE. It will then continuously display the most positive value experi-
enced since the button was pressed (see Figs. 22 and 23, Section 5.b).* The but-
ton will remain lit as long as the instrument is in the "+PEAK" MODE. Each
captured maximum value will remain in digital memory until occurrence of a sub-
sequent higher-valued maximum or until the instrument is returned to "TRACK"
MODE. Pressing the button a second time will cause the instrument to return to
"TRACK" MODE.
When the "PEAK" logic input terminal is connected to GROUND (i.e., at the "Logic
1" level), the PEAK/TRACK button is DISABLED.**
NOTE: The PEAK/TRACK button is not active during SETUP MODE.
E.1
RUN-TIME BUTTON FUNCTIONS
E
RUN-TIME BUTTON FUNCTIONS
* For all models except the Model 3510 Thermocouple Conditioner and the Model 3540 Fre-
quency Conditioner, the captured "+PEAK" can be issued as the instrument's ANALOG OUT-
PUT, when the appropriate jumper connections have been made (see Section 2.d). Note also
that when the "PEAK" logic input terminal is at "Logic 0," a command of PEK=ON [CMT]
applied via the RS-232/485 Interface Port has the same effect as pressing the PEAK/TRACK
button the first time, while PEK=OFF [CMT] has the same effect as pressing the button the
second time (see Section 5.b for the use of these commands).
** Changing the logic level of the "PEAK" logic input terminal from "Logic 0" to "Logic 1" has the
same effect as pressing the PEAK/TRACK button the first time (i.e., it places the 3500 instru-
ment in "+PEAK" MODE), while changing the "PEAK" logic input terminal from "Logic 1" to
"Logic 0" has the same effect as pressing the button the second time (i.e., it returns the instru-
ment to "TRACK" MODE). A Logic 1 level at Logic Input 6 also disables the PEK=ON [CMT]
and PEK=OFF [CMT] mnemonic commands as well as the PEAK/TRACK button (see Section
5.b).
SET UP
PEAK
TRACK
Appendix E
Run-Time Button Functions
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