Philips 6652C - An Introduction to Operating PM 6652-54

AN INTRODUCTION TO OPERATING
THE PM 6652/54
This brief introductory guide has been created
to avoid the use of lengthy texts to describe
the various operating characteristics of the
PM 6652/54 Timer/Counters. In it, the first time
user is taken on a step by step exercise, using
most of the controls and indicators , and having
any doubtful points explained.
Note: Before applying power, ensure that the in-
stallation checks have been carried out (chapter
2).
1 Before switching on, look at the STAND BY in-
dicator at the far :right of the display pa-
nel. It is lit, indicating that instruments
fitted with an oven stabilised oscillator
have power supplied to the oscillator.
2 Switch on, and watch the self-test program
run (see "Installation") .
3 Switch off again, then find the rear panel
switch marked "INT". Put this switch into the
EXT (down) position.
4 Switch on again. The se 1 f-test program will
end with E4 - a measuring logic circuit er-
ror. Put the INT/EXT switch back to INT, then
press RESET. Alternatively, put the switch
back to INT, then switch the power off and on
again. The effect is the same.
5
Make sure that there are no input signals
connected.
6 Find the function display above the three
pushbuttons marked FUNCTinN. The arrow cursor
should be pointing to FREQ A. It doesn't mat-
ter if it isn't, but if the "function" cursor
is pointing to some other function, then
there will also be another cursor on the
P1 • • • P8 indicator column. This shows that a
"stored pane 1 program" is active.
fREQ A
FR£0 C
PERIOD A
RATIO A/9
RATIO C/8
TIME A-8
P. WIDTH A
PHAS£ A-8"'
RIS£/ F AL~ A
DUT Y fACT A
TOT A/.r-1.8
TOT A/J\.J\8
TOT A/MAN
Vnu; :.c Vrn in
Vpp A
TEST
r- FUNCTION---,
•D•
•D•
STORE
G
P1
P2
P3
P4
PS
P6
P7
PB
REMOTE
ARMED
FREGAVG
EXT GATE
STANDBY
INV EX CON
]
math not
stored
7 Push the FUNCTION buttons (marked with ar-
rows), and see how the function cursor "steps
through" the list of functions. (It won't
stop at the channel C functions unless the
channel C option is fitted). Note how , when
the function cursor passes FREQ A (going up)
or TEST (going down), the P8 or P1 cursor
lights.
Also note that when a P is indicated, the
"program" cursor is the one that steps up and
down in response to the FUNCTION buttons,
while the "function" cursor moves in accor-
dance with the function that was set in the
program. Don't touch STORE yet.
8 Press the UP or DOWN buttons continuous! y,
and note how the cu:rsor(s) "scroll", with the
"function" cursor hesitating at FREQ A and
TEST (to give the operator time to release
the but ton) •
9 Set the function cursor to FREQ A, with no
program active (no P indicated). Then tur n
the power off and on.
10 Look across at the input signal and TRIGGER
LEVEL control groups (to the right). Channel
A AC coupling and AUTO triggering should be
selected (LEDs lit). The instrument will al-
ways select these two controls for any "manu-
al" measurement (i . e., no stored panel pro-
gram P1 ... P8) ,
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