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Model 8902A
Operation
Rear-Panel Features
1. AM OUTPUT produces an ac signal, whose amplitude is proportional to the AM depth, with
a d c component related to the IF level. The output is dc coupled with a 16
kHz
bandwidth and
a 10 kit output impedance. [See AM
Oirtpiri.]
2. FM OUTPUT produces an ac signal, whose amplitude is proportional to the FM deviation,
with a dc component related to the IF frequency. The output is dc coupled with a
16
kHz
bandwidth and a 10 kR output impedance. [See FM Oictput.]
3. RECORDER OUTPUT allows user-access to all internal measurement voltages. [See Recorder
4. IF OUTPUT produces a 150 kHz to 2.5 MHz modulated IF signal. The output level ranges
from -27 to
-3
dBm (50R output impedance). [SeeZF
Outpici.]
5. TIME BASE 10 MHz OUTPUT and INPUT. The input connector provides an input for an
external 10 MHz time base reference. The external input signal must be greater than 0.5V
peak-to-peak (into a 500R input impedance). The output connector provides an output for the
internal, high-stability 10 MHz reference. Output signal is TTL compatible (500 nominal output
impedance). (Refer to paragraph 3-3. Timc Baw
10
MHz
Inpiri
and Timc Bajc
10
MHz Output.)
6. MODULATION OUTPUT/AUDIO INPUT is a rear-panel output and input supplied on
Option 00 I instruments. Refer to MODULATION OUTPUT/AUDIO INPUT referenced from
Figure 3-1.
7. SENSOR is a rear-panel input for the power sensor supplied on Option 001 instruments. Refer
t o SENSOR referenced from Figure 3-1.
8. INPUT is a rear-panel input for the R F input signal. This input is supplied on Option 001
instruments. Refer to INPUT referenced from Figure 3-1.
9. Fuse. 2.5A (250V normal blow) for 100 or 120 Vac. 1.5A (250V normal blow) for 220 or 240
Vac.
10. Serial Number Plate. The first four numbers and letter comprise the prefix that denotes the
instrument configuration. The last five digits form the
suffix
that is unique to each instrument.
11. Line Power Module permits operation from 100, 120, 220, or 240 Vac. The number visible in
the window indicates the nominal line voltage to which the instrument must be connected.
(See Figure 2-1, Line Volrage and Firse
Sdccrion)
The center conductor is safety earth ground.
12. FREQ OFFSET TTL OUT outputs a voltage that can be
used
to switch
an
external mixer in
and out of the path between a microwave input signal and the Measuring Receiver when the
instrument is in Frequency Offset Mode. The TTL output is always OV if Frequency Offset
Mode is not selected or while Frequency Offset Mode is selected with an entered external LO
value of 0 Hz. If the entered external LO frequency is less than or equal to 18 GHz, the TTL
output is +5V. If the entered external LO frequency is greater than 18 GHz, the TTL output is
3V. [See I;i-c.clirency Ol/w/ Conlrol.
]
13. HP-IB Connector connects the Measuring Receiver to the Hewlett-Packard Interface
BUS
for
remote operations. When the HP-IB is being used, the annunciators next to the LOCAL key
light as appropriate (REMOTE, LISTEN, TALK, SRQ).
14. REMOTE CONTROL RF SWlTCHES enable the user to build an internal sensor module that
can switch between the R F INPUT connector and the SENSOR connector. [See RiwoIc Conrrol
R F Swifch.
]
15.
LO
OUTPUT and INPUT (Option 003 and Option Series 030 only). Option 003 provides an
LO output connector and an
LO input connector. The LO output connector is provided to
output the Local Oscillator signal. The output signal is 1.27 to 1301.5 MHz at approximately
0 dBrn
(Son)
nominal output impedance. The LO input connector provides an input for an
external Local Oscillator. External input signal required is 1.27 to 1301.5 MHz at approximately
Olrlpllf.
3
3-9
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