HP 8642A - Page 96

Model 8642A/B
Operation
AMPLITUDE
Description Output amplitude can be entered directly in units of: dBm, V, mV, 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
Ranges
Resolution
Absolute Level Accuracy
1
Output Level Switching Time
Output Impedance
Flatness
SWR
Reverse Power Protection
Third Order Intermodulation
Absolute level accuracy consists of allow
Performance Limits
-20.0 to -140.0 dBm
(2.24V to 0.023 MV)
(4.49 EMF V to 0.046 EMF uV)
(+127.0 to -33.0 dB
M
V)
(+133.0 to -27.0 dB EMF MV)
+ 19.0 to -140.0 dBm
(2.00V to 0.023 MV)
(4.01 EMF V to 0.046 EMF ^V)
(+126.0 to -33.0 dB^V)
(+132.0 to -27.0 dB EMF MV)
+ 18.0 to -140.0 dBm
(1.78V to 0.023 MV)
(3.56 EMF V to 0.046 EMF MV)
(+125.0 to -33.0 dB,uV)
(+131.0 to -27.0 dB EMF uV)
+ 17.0 to -140 dBm
(1.59V to 0.023 MV)
(3.19 EMF V to 0.046 EMF MV)
(+124.0 to -33.0 db/iV)
(+130.0 to -27.0 dB EMF
M
V)
+ 16.0 to -140.0 dBm
(1.41V to 0.023
M
V)
(2.83 EMF V to 0.046 EMF uV)
(-123.0 to -33.0 dB
M
V)
(+129.0 to -27.0 dB EMF MV)
0.1 dB
±1 dB
±3 dB
<100 ms
50 ohms
<±0.75 dB
<1.5:1
<2.0:1
25W, 50 Vdc
<-55 dBc at +10 dBm. Typi-
cally decreases 10dB for every
5 dB of combined level
decrease.
ances for detector linearity, temperature, fl
Conditions
For the 8642A and 8642B:
RF Frequencies of 0.100000 to
264.375000 MHz (except Heterodyne Band)
For the 8642A:
Not applicable
For the 8642B:
RF Frequencies of 264.375001 to
528.750000 MHz.
For the 8642A:
RF Frequencies of 264.375001 to
528.750000 MHz as well as Heterodyne Band
RF Frequencies of 0.100000 to
132.187500 MHz
For the 8642B:
The above Heterodyne Band RF Frequencies
For the 8642A:
Not applicable
For the 8642B:
RF Frequencies of 528.750001 to
1057.500000 MHz
For the 8642A:
RF Frequencies of 528.750001 to
1057.500000 MHz.
For the 8642B:
RF Frequencies of 1057.500001 to
2115.000000 MHz
Output Amplitude >-127 dBm into a 50fi load
Output Amplitude <-127 dBm into a 50fi load
From receipt of controller command
Output level, +10 dBm
Output levels <0 dBm
Output levels >0 dBm
Two signal generators with frequencies
spaced 25 kHz apart into a resistive combiner.
atness, and attenuator accuracy.
3-69