Model 8640B TM 9-4935-601-14-7&P
FRONT PANEL FEATURES
REDUCE PEAK DEVIATION: indicates PEAK
DEVIATION setting is too high for the selected
frequency range.
5 COUNTER MODE: Buttons control operation of
frequency counter.
EXPAND: X10 expands resolution one digit,
moving the decimal point one place to the left;
X100 expands resolution two digits, moving the
decimal point two places to the left.
NOTE
EXPAND X10 and EXPAND X100
buttons are interlocked so that only
one button can be depressed at a
time.
LOCK: phase locks Signal Generator to the
internal (or to an external) crystal reference.
Display indicates lock frequency; loss of lock
causes display to flash and indicate actual
frequency of Signal Generator.
INT: programs counter to count frequency of
Signal Generator.
EXT 0-10, EXT 0-550: programs counter to
count frequency of signal at COUNTER IN.
PUT jack; also selects counter frequency range
in MHz.
6 FREQUENCY MHz: counter readout indicates RF
frequency in MHz. Flashing display indicates loss of
phase lock. The OVERFLOW lamp lights to
indicate that significant data is not being displayed.
7 TIME BASE VERNIER: used as a fine frequency
tune when in lock mode to give continuous tuning
between lock points (the use of the COUNTER
MODE EXPAND X10 control is necessary on some
ranges to tune over the full range). When control is
not in CAL position, the UNCAL lamp lights to
indicate that the counter is uncalibrated.
8 RF ON/OFF: enables or disables the RF output.
9 RF OUTPUT: RF output through Type N female
connector. (Connector meets US MIL C-39012 50
ohm ac coupled source impedance CAUTION Any
interruption of the protective (grounding) conductor
inside or outside the instrument is likely to cause
damage to the instrument. To avoid damage, this
instrument and all line powered devices connected
to it must be connected to the same earth ground
(see Section II).
10 OUTPUT LEVEL: the switch controls a 10 dB step
attenuator that sets the output level range.
Calibrated concentric vernier sets actual output
level within an 18 dB range (the meter gives
additional resolution).
NOTE
For optimum operation, use the
vernier in the top 10 dB of its range.
11 FINE TUNE: fine frequency control.
12 FREQUENCY TUNE: coarse frequency control.
13 RANGE: selects one of ten octave frequency
bands. The 512-1024 MHz/Doubler position gives
256-5 l 2 MHz at RF OUTPUT, but the
FREQUENCY MHz readings and FM meter
indications are corrected for use with an RF doubler
connected to RF OUTPUT.
14 COUNTER INPUT: external input to frequency
counter; impedance is 50 ohms.
CAUTION
Do not apply a dc voltage or >+15
dBm to COUNTER INPUT.
Figure 3-2. Front Panel Controls, Indicators, and Connectors (2 of 4)
3-3
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