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38
2.10. Time interval average measurement
PM 6650
programmable
counter/timer
512 MHz/'ns
—
PHILIPS
:
LEVEL
PULL
FOR
.
PRESET
DISPLAY
TIME
GATE
REMOTE
man
Sax
|
= = Taeaeate
a.
ATT: COUPL
SLOPE
PULL FOR HOLD
RESET
FUNCTION
stop w
ay
3 te
GaTEeS
pyre
COUNT
A=
POWER
on
sus-unit ¢
ZO SHECK
on
DISPLAY TEST
=
. Set FUNCTION switch to T.I. AVG. A to B.
2. Set DISPLAY TIME to mid-position.
3. Set MULTIPLIER
switch to number of intervals to
'
be averaged.
4. Depress MEMORY
switch.
5. Select desired
COUPLing
and SLOPE
of chan-
nel A.
6. Select desired
COUPLing
and SLOPE
of chan-
nel B.
7. Select suitable input impedance.
8.a. Start/stop signals from common source:
Depress COM
switch and connect signal to in-
put A.
b. Start/stop signals from separate sources:
Depress SEP switch and connect start signal to
input A and stop signal to input B.
9. Set ATTenuation A switch and LEVEL A control to
desired
start level. Monitor
set level on oscillo-
scope connected to rear output LEVEL OUT A.
10. Set ATTenuation B switch and LEVEL B control to
desired stop level.
Monitor
set level
on
oscilloscope
connected
to
rear output LEVEL OUT B.
11. Adjust DISPLAY TIME to desired position.
NOTE
1: Delay from STOP to the next START pulse
must be at least 50 ns.
NOTE 2: Start/Stop signal from common
source
has
fast edges:
greater accuracy is obtained if
SEP switch is depressed and signal applied
to inputs A and B via 50 Q T-piece PM 9584.
NOTE 3: Avoid such conditions where the input signal
is synchronous with the PM 6650's internal
10 MHz clock rate (e.g. if measuring object
is phase-locked to the 10 MHz clock).
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