Philips 6652C - Control Panel Logic

CONTROL PANEL LOGIC
The front panels of the PM 6652 and 6654 are
arranged with a certain common logic to the way
in which the keys and indicators operate. These
common factors are:
Colour Coding
The descriptive text around the front panel keys
is colour coded. The meaning of the colours is:
ORANGE
GREEN
WHITE
- The co1trol is one used to set or
store ~ . nl.lllerical value (i.e.,
trigger level or mathematical con-
s tant).
The control is in the state ex-
pressed by the gr ee n script when
the LED is alight . When the LED is
not lit, the control is in the
state indicated by the white
script.
White text is used to show the
funct.ion of a group of controls,
and to indicate the function of a
control which has only one opera-
tional state ( e.g., the READ con-
trols).
LED Indicators
The LED indicators are colour coded to show:
GREEN
STEADY RED
- The green script state applies.
- The control is active (e .g.,
READ). No measurement is pas
sible.
BLINKING RED - Applies to the ENTER key when it
is expected that either the
ENTER key or RESET (to cancel
the condition) should be pressed
next.
Using LOCAL/RESET*
A short depression of the LOCAL /R ESET button
makes the counter switch from remote to local
mode.
If the button is depressed longer than 400 ms,
it also activates the RESET function.
RESET stops the m eas urement and rese ts the dis-
play to zero when depressed. It also cancells
READ, ENTER and STORE. When released a new
measurement is started. Although certain other
controls will also do this, it is good practice
to use RESET.
RESET interrupts m eas urement for as lo ng as the
RESET control is kept pressed . It wi 11 not de-
stroy values entered as trigger levels via the
KEYBOARD function, or MATH constants.
* The button is only a RESET button on the
PM 6652, 54. Switching to local can only be
performed from the IEEE-488 bus.
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