Philips 6652C - Page 7

INTRODUCTION
The Phi lips high performance timer / counters
PM 6652, PM 6654, PM 6652C and PM 6654C are
fully programmable and satisfy most frequency
and
time measureme nt requirements. The four
instruments look the same; the differen ces being
found in resolution, accuracy and measuring
speed.
The PM 6652 and Pf~ 6652C have a 10 MHz (100 ns )
clock frequency, wh e reas the extra high reso -
lution PM 6654 and PM 6654C feature s a 500 MHz
(2 ns) real time clock .
Thanks
to their s hort measuri ng cy cle times, the
PM 6654 and PM6654C are particularly well suited
to hi gh speed automatic test systems.
The 'C' - version, introduced in 1986, have new
features added to those of the original PM 6652
and
PM 6654. A note is made if a function de-
scribed in this manual is not applicable to the
original PM 6652,-54.
All units are also available in blind panel
versions.
Choice of crystal oscillators
The choice of crystal oscillators ranges from a
standard oscillator to the 5 x 1o-10 /24 h oven
stabilized oscillator PM 9691. The high stabili-
ty crystal oscillators are available as options
for later upgrading of the counters.
High measuring power
The two timer/counter s featur e 14 different
measuring modes: everything found in conventio-
nal counters, plus extra functions such as:
PHASE, (directly in degrees), RISE/FALL TIME,
DUTY FACTOR and VOLT .
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