Philips PM 6650 Operating Manual page 4

Il. INTRODUCTION
The PM 6650 can perform CW frequency, burst fre-
quency, ratio, totalize, single period, period average,
time interval and time interval average measurements.
The frequency range is 512 MHz and the accuracy at
time interval measurement is 1 ns.
The three models PM 6650 A, B and E are identical
except the stability of the clock oscillator used.
Each model features two direct-gated input channels
A and C for frequency measurement, and a third input
B for time interval or ratio measurement or external
ll. CABINETS AND BLANK PANELS
The PM 6650 is supplied without cabinet. The counter
can be placed either in a bench cabinet or in a 19"
cabinet.
PM 9714 A
Bench cabinet (4/6 rack size) including handle, feet,
tilting bracket and skin plate covers.
PEM 5037
Figure IIl-1._ Bench cabinet, 4/6 rack sizes
GENERAL INFORMATION
gating of channel A. The inputs have selectable 1 MQ
and 50-Q impedance. The nine-digit planar display has
leading zero blanking and switchable memory.
The PM 6650 can be used as bench equipment or in an
automatic test system using the options available.
Typical applications are time domain measurements
such as frequency, period time, pulse duration, phase
difference.
Pulsed carriers can be measured directly using the
burst mode.
PM 9716A
19" cabinet (6/6 rack size) including grips, feet, tilting
bracket, skin plate covers and cable cover with 2
angular brackets for 19" rackmounting.
19" cabinet, 6/6 rack size
Figure II-2.
PM 9721
Blank panel to cover 1/6 empty space.
PM 9722
Blank panel to cover 2/6 empty space when the
PM 6650 is placed in PM 9716 A cabinet and no sub-
unit is used.