Model
8642A/B
Description
Operation
AMPLITUDE
Output
amplitude
can
be
entered
directly
in
units
of: dBm,
V,
mY, uV,
and
dBuV.
EMF
amplitude
units
can
also be
directly
entered
in
units
of:
EMF
V,
EMF
mV,
EMF
uV,
and
dB
EMF
uV. The
Attenuator
Range Hold
function
(Special
Function
9)
enables
the
Signal
Generator
to
produce a 30
dB
amplitude
range
with
monotonic,
step-to-step
amplitude
increments. The
RF
output
can
be
turned
off
using
two
different
methods.
One
method
turns
off
the
output
without
adjusting
the
Signal
Generator's
output
attenuators.
The
other
method
reduces
the
output
below
the
lowest possible
amplitude
setting
using
the
output
attenuator
and
the
automatic
leveling
control
circuit.
Table
3-13.
Output
Amplitude
Operating
Characteristics
Electrical
Characteristics
Performance
Limits
Conditions
Ranges
+200
to
-140.0
dBm
For the 8642A and 8642B:
(224V
to
0023
IN)
RF
Frequencies
of
0.100000 to
(4,49 EMF V
to
0.046 EMF
IN)
264.375000
MHz
(except Heterodyne Band)
(+1270
to
-33.0
dBjlV)
(+133 0 to
-27.0
dB
EMF
Ji.V)
+19.0 to
-140.0
dBm
For the 8642A:
(200V
to
0.023 /lV) Not applicable
(401 EMF V
to
0046
EMF /lV)
For the 8642B:
(+126.0 to
-330
dBJi.V)
RF
Fr'equencies of 264.375001 to
(+132.0 to
-27.0
dB
EMF /lV)
528.750000 MHz.
+18..0 to
-1400
dBm
For the 8642A:
(1.78V
to
0.023 !lV)
RF
Frequencies of 264 375001
to
(3.56 EMF V
to
0046
EMF /lV)
528.750000
MHz
as well as Heterodyne Band
(+125.0 to
-33.0
dB/tV)
RF
Frequencies of 0.100000 to
(+131.0 to
-27.0
dB
EMF /lV)
132187500
MHz
For the 8642B:
The above Heterodyne Band
RF
Frequencies
+17.0 to
-140
dBm
For the 8642A:
(1
59V to 0.023
JlV)
Not applicable
(319
EMF V
to
0046
EMF
Ji.V)
For the 8642B:
(+1240
to
-33.0
db/lV)
RF Frequencies of 528.750001 to
(+1300
to
-27.0
dB
EMF !lV) 1057.500000 MHz
+16.0 to
-140.0
dBm
For the 8642A:
(1
41V to 0.023
JlV)
RF
Frequencies of 528.750001
to
(283
EMF V
to
0.046 EMF !lV)
1057500000 MHz
(+1230
to
-33.0
dB/tV)
For the 8642B:
(+1290
to
-27.0
dB
EMF /lV)
RF
Frequencies of 1057.500001
to
2115.000000
MHz
Resolution
0.1
dB
Absolute Level Accuracy'
±1
dB
Output Amplitude
2:
-127
dBm into a
5011
load
,,3
dB
Output Amplitude
<-127
dBm into a
son
load
Output Level Switching Time
<100 ms
From receipt
of
controller command
Output Impedance 50
ohms
Flatness
<,,075
dB
Output level.
+10
dBm
SWR <1.5:1 Output levels
<0
dBm
<2.0:1
Output levels
2:0
dBm
Reverse Power Protection 25W. 50 Vdc
Third Order Intermodulation
<-55
dBc
at
+10
dBm. Typi- Two signal generator s with frequencies
cally decreases 10
dB
for every spaced 25 kHz apart into a resistive combiner
5
dB
of combined level
decrease
1AbsoJute level accuracy conSists of allowances for detector linearity, temperature. flatness_ and attenuator accuracy
3-69
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