External Gate - Keithley 775A Instruction Manual

INPUT CHARACTERISTICS PERIOD
A
Channel
A,
B;
each channsi
RANGE.'
0
to
12CMHz,
dc coupled,
to
120MHZ;
ac
coupled.
SENSmVir/
(xl);
25mV
nns,
<10MHz,
50mV
rm
>10MHz.
DYNAMIC RANGE
(xl):
50mV
to
5V
pk-pk,
<20MHz.
i40mV
to
2.5V pk-pk. >20MHz.
COUPLING:
ac
or
dc,
switchable.
IMPEDANCE: IMO
nominaL, shuoted
bj?
<60pF,
ATTENUATOR:
xl or xl0 nominal,
switchable.
LX3W
PASS
FILTER:
-lOdB
at
lOOkHz
nominal,
switchable.
SIGNAL OPERATING
RANGE
(xl>?
-2,55V dc
to
-2,55V
dc.
TRIGGER
LEVEL:
-2.55V dc to
+2.55V
dc,
xl,
'25.5V
dc to +25.5V
dc,
xlO,
TRIGGER
LEVEL RESOLUTION!
lOmV,
,xl,
lOOmV,
xir.
TRIGGER
LEVEL
SHTHNC
ACCURAO-!
±(35mV +
2%
of
setting), xl,
±(350mV f
2%
of
setting),
xli)
TRIGGER LEVEL SETONG--OUTPUT:
via rear panel
BNC,
not adjusted
for
attenuators.
•SLOPE:
+
or
- slope,
switehable.
DAMAGE
LEVEL:
xl:
.
dc=2kHz
25CfV dc
4-
peak
ac
2kHz-'i00kHz
5 x 10^' rms^Hz/frequencv
>
100kHz
5V
rms
•
xJD:
dc-20kHz
20kHz'100kHi
>10QkHz
250V dc
-f
peak
ac
5
X
10"V
rryi3®Hz,''irequency
50V'
rms
R/VNGEi
10ns to 10"
seconds.
LSD DISPLAYED:
10ns
to 0.1ms.
ACCURACY:
±1
LSD
±{Time
.Base Error x Period)
± Trigger
Error.
RANGE:
10ns
to lOsec.
LSD DISPIAVSD:
(10ns x Period),/Gate Time.
RESOLUTION:
,,
,
(1.4
X
TV^er
Error
-i-
2ns) x Period
±.t
Lbu
±
^
—
Gate
llirie
ACCURACY:
±
Resolution ^(Time
Base Error
x
Period)
NUMBER
OF PERIODS AVERAGED:
Gate Time/Period
RA.NGE:
IGns
to
10^ seconds.
LSD DISPLAYED:
10ns
to
0.1ms.
ACCURACY:
±1
LSD
±(Time
Base Error x
Time
interval;
±
Trigger Error
±
Trigger Tuning
Error ±2ns.
PULSE WTETTH
A
(Positive or Negative)
RANGE:
lOns
to
K)"
seconds.
LSD
DU5PL.AYED; 10ns
to
0.1ms.
ACCURACY:
±1
LSD
±(Time
Base
Error x
Pulse Width)
t
Trigger Error ± Trigger
Timing
Error
+2n.'>,
TOTALIZE
A
Channel
C
(with
Model
7751 option)
RANGE:
SOMHz
to
1.3GHz.
SENSITIVITY:
15mV,
50MHz
to l.OGHz:
25mV, 1.0GHz
to
1.2GHz;
;^mV, 1.2GHz
to
1.3GHz
DYNAMIC
lU^NGE:
25mV rms
to
IV
rms.
COUPLING:
ac,
IMPEDANCE:
5CQ.
DAMAGE
LEVEL:
dC'lOQkHz
15V
dc
-r
peak
ac
>100kHz 5V rms
FREQUENCY
A,
B
RANGE:
O.lHz
to
OOMHz,
LSD
DISPLAYED:
(10ns x
Frequency)/Cate Time
RESOLUTION:
1
\SD
^
Tri^er
Error
-r
2ns)x
Frequency
G^e
Time
ACCURACY:
iResoiution
±(Time Base
Error
x
Frequency)
DIGITS
DISPL.4YED:
8 per
second
of
Gate
Time,
minimum.
MOOES:
Cunuiiative
or
.A
gated by B
RANGE:
0
to 10**
-1
REPETITION RATE: 120MHz
max.
LSD DISPLiWED:
1
count
up
to
10*®--!,
then
9
most sigmd'
cant
dig,
its.
ACCURACY:
*1
LSD
GATH/DELAY
INTERNAL GATE
TIME;
Variable from.
lOO^ts to
lOsec
in 43
increments, or
one
period of the input, whichever
is
longer,
May
be used
in
Frequency
and
Period Average
measurements.
EXTERNAL GATE
TIME:
Contmuou.sly
variable horn.
100/is
to IDsec;
or
one
period
of the input,
whichever
is
longer.
EXT'ERNAL
GATE
DELAY:
10/iS
+ one
period,
of
the
input
.signal,
maximum.
INTERNAL DELAY
TIME:
Variable
from lOtV
to
iOsec
m
45
increments.
May
be used
in Period,
Time
Interval
and Pulse
Width
mea-surements.
EXTERNAL DELAY
TIME;
Continuously variable
from
100, us
to
>1
hour.
EXTERNAL GATE/DELAY
INPUT:
Positive
TTL
signal via
rear panel
BNC.