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32
2.5. RATIO A TO B measurement
(multiple ratio = x N)
7S
oy
©
CY)
PM 6650
programmable
counter/timer
512 MHz/'1ns
PHILIPS
LEVEL
DISPLAY TIME
—
.
PULL FOR .
GATE
REMOTE
« PRESET
i
_
.
i
-3¥
+3
Min'
max
|
=
lg
j
=30¥
+30¥
:
i
id
M 4
PULL FoR HOLO
|
|
eee
ATT COUPL SLOPE
er)
'
|
$
4
:
eunst
FUNCTION
STOP
m» .
;
XY:
AVG
oB8
GATED
.
;
R
FREG
A
sYs
'
:
[
—
COUNT A=
|
FREQ C
sus-unit 7
< CHECK
DISPLAY
TEST
1
2
3
4
. Set FUNCTION switch to RATIO A/B.
. Set DISPLAY TIME to mid-position.
. Depress MEMORY
switch.
. Select desired
input conditions
of channel A (at-
tenuation, coupling, slope).
5. Select suitable input impedance.
6. Depress SEP switch.
7. Select desired
input conditions of channel
B (at-
tenuation, coupling, slope).
8. Connect
signal with
higher frequency
(fa, 0 to
160 MHz) to input A.
9. Connect
signal
with
lower
frequency
(fp, O to
10 MHz) to input B.
10. Set LEVEL A control for proper triggering level of
channel A (lamp at input lights permanently).
11. Set LEVEL B control for proper triggering level of
channel B (lamp at input lights permanently).
12. Set TIME
BASE/MULTIPLIER
switch
to desired
multiplying factor N (1 to 107).
13. Read result direct on display.
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