HP 8901B

Model 8901B
Rear-Panel Features
Operation
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15.
AM OUTPUT produces an ac signal, whose amplitude is proportional to the AM depth, with a
dc component related
to the IF level. The output is dc coupled with a 16 kHz bandwidth and a
10 kR output impedance. [See
AM Output.]
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 Output.]
RECORDER OUTPUT allows user-access to all internal measurement voltages. [See Recorder
IF OUTPUT produces a 150 kHz to 2.5 MHz modulated IF signal. The output level ranges from
-27 to -3 dBm (500 output impedance). [See IF Output.]
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
500n 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. Time Base 10 MHz Input and Time Base 10 MHz Output.)
MODULATION OUTPUT/AUDIO INPUT is a rear-panel output and input supplied on
Option 001 instruments. Refer
to MODULATION OUTPUT/AUDIO INPUT referenced from
Figure 3-1.
SENSOR is a rear-panel input for the power sensor supplied on Option 001 instruments. Refer
to SENSOR referenced from Figure 3-1.
INPUT
is a rear-panel input for the RF input signal. This input is supplied on Option 001
instruments. Refer to INPUT referenced from Figure 3-1.
F’use. 2.5A (250V normal blow) for 100 or 120 Vac.
1.5A (250V normal blow) for 220 or 240 Vac.
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.
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 Voltage and he Selection) The center conductor is safety earth ground.
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 Modulation Analyzer 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
Bequency offset Control.]
HP-IB Connector connects the Modulation Analyzer 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).
REMOTE CONTROL RF SWITCHES enable the user to build an internal sensor module that
can switch between the RF INPUT connector and the SENSOR connector. [See
Remote Control
RF Switch.]
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 dBm
(50R) 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 0 dBm
Output.]
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