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b. TOT A, AAR
Totalizes Channel A be-
tween pulses on Channel B. (Refer to para-
graph 9H-3-33.) Totalizes signals up to 75
MHz with TIME BASE switch in position 1
(blue lettering), up to 5 MHz
with TIME
BASE switch in any other position (10N).
2. TIME BASE. Ten position switch performs the
following functions:
a.
lps, 10 us, .Ims, 1 ms, 10 ms, .1s,1s,10s
(black lettering). Provides eight selectable
times as gate time controls for frequency
(FREQ A) measurements.
b.
.1 us, 1 us, 10 us, .1 ms, 1 ms, 10 ms, Ja
1 s, 10 s (black lettering). Provides resolu-
tion of 100 ns to 10 s when FUNCTION
switch selects period (PER B) or time inter-
val (TIME A — B) mode of operation.
c.
1, 10, 102, 103, 104, 105, 108, 107, 108, (blue
lettering). Provides selection of number of
eycles or events
averaged
when
FUNC-
TION switch selects frequency ratio (FREQ
A/B), period average (PER AVG B), or time
interval
average
(TIME
AVG
A-B)
d.
1, 10, 102, 10%, 104, 105, 108, 107, 108, (blue
lettering).
Provides
scaling
factor
when
FUNCTION
switch selects totalize (TOT
A, "LI B/TOT A, AA B) modes of opera-
tion.
e.
AUTO/.1
us 1. The AUTO
position pro-
vides four function auto-ranging (pertains
to gray-bordered FUNCTION
switch posi-
tions) including frequency (FREQ A), fre-
quency ratio (FREQ A/B), period average
(PER AVG
B) and time interval average
(TIME
AVG
A-B).
Provides
maximum
resolution that can
be obtained in each
function within a maximum of 1.1 second
measurement time.
f.
AUTO/.1
us 1. The .1 us 1 position per-
tains to the FUNCTION switch lower-half
positions (corresponding letter colors). The
.1 us position (black lettering) pertains to
TIME A—B and to PER B. The 1 position
(blue lettering) pertains to TOT A, LI
B
and to TOT A, -AALB.
O/C (open/close). Pushbutton switch enables
input signals to Channel
A to be totalized
when the FUNCTION
switch selects TOT A,
AA
D Totalizing is initiated by pressing
the O/C switch and is terminated by pressing
the switch
a second time. To reinitiate the
Model 5308A
Operation
totalize function the reset switch on the front
panel
of
the
5300B
mainframe
must
be
pressed. An
additional
function of the O/C
switch is to operate the display as a stop- ~
watch (see Figure 9H-3-12),
LEVEL A and LEVEL B. Used in conjunction
with
ATTENUATORS
switch
to determine
voltage at which triggering occurs for Chan-
nel A or Channel B. In SET position, trigger-
ing is centered around 0 volts when the rear
panel "SET" TRIG
LEVELS
switch is in the
OV
position.
Trigger
level is continuously
variable over the range of +2V (ATTENUA-
TORS
IN
X1)
or
+20V
(ATTENUATORS
in X10). Adjacent lamp indicates when ampli-
fier triggering occurs.
CHAN A and CHAN
B. Input connectors for
Channel A and Channel B. Input impedance
is 1MQ shunted by less than 48 pF. By using
a 10 to 1 divider probe, input impedance can
be increased to 10 MO.
Slope
Switch. Selects the triggering on posi-
tive or negative slope of the input signals to
Channel A (switch on left side) or Channel B
(switch on right side).
SEP-CHK-COM
B.
mon B).
(Separate-Check-Com-
a.
SEP. Channel A and Channel B are con-
nected for separate source inputs (1 MO
input impedance).
b.
CHK.
Self check verifies that the major-
ity of the 5300B mainframe logic circuits
and the 5308A logic circuits are function-
ing properly.
c.
COM
B.
Disconnects
front panel input
connector
CHAN
A
and
connects
CHAN B
to the amplifiers for Channel
A and Channel B in parallel (IMQ input
impedance).
ATTENUATORS.
Selects attenuation
of the
input signals to Channel A (switch on left
side) and to Channel B (switch on right side).
a.
X1 connects input signals directly to input
amplifiers.
b.
X10 attenuates input signals by a factor of
10.
. AC-DC. Selects ac coupling or de BE
of
the input signals to Channel A (switch on left
side) or Channel
B (switch on
right side).
Figure 9H-3-2.
Front Panel Controls and Connectors
(Cont'd)
9H-3-5
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