HP 3336A Operating Manual page 24

Model 3336A/B/C
Operation
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SERVICEABLE PARTS INSIDE |
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REFER SERVIC
QUALIFIED PERRONNEL.
(1) X DRIVE Output. Supplies a O V to > + 10 Vdc linear (10)
ramp during frequency sweeps. Does not reset after
single sweep until SINGLE key is pressed. (Paragraph
3-81)
(2) Z BLANK Output. Supplies a TTL low level during fre-
quency sweeps, capable of sinking current from a
positive source. (Paragraph 3-71)
MARKER Output. Supplies a TTL high to low level tran-
sition at the programmed Marker Frequency. Only oc-
curs during linear sweep up. (Paragraph 3-83)
@) AC Line Fuseholder. Contains the line fuse. Use a 1
Amp fuse for 100/120 volt operation. Use a % Amp
fuse for a 220/240 Volt operation. (Paragraph 3-99)
DO NOT USE SLOW BLOW FUSES!
® AC Line Input Connector. Accepts power cord supplied
with the instrument.
HP-IB Connector. Used to interface the instrument
with the Hewlett-Packard Interface Bus (HP-IB). This
connector accepts metric threaded cable lockscrews
only. Metric jockscrews are black anodized. (Figure 2-3)
HP-IB Address Selection Switches. Binary weighted
switches that set the HP-IB (talk and listen) Address of
the instrument. Preset to 4 at the factory. (Paragraph
2-15)
LON Switch. When set to LON, the instrument will
Listen ONLY to messages from the HP-I8. The in-
strument's transmit capabilities are disabled.
Air Filter. Cleans air circulated through the instrument
for cooling. Check and clean this filter periodically.
(Paragraph 3-101)
A
3336-3-1
REAR 21-60 MHz OUTPUT Annunciator. Lit when the
21-60 MHz OUTPUT is activated. Output is activated
by programming frequencies = 21 MHz and deac-
tivated by programming frequencies < 20 MHz.
(Paragraph 3-45)
SYNC Output. Supplies a TTL level square wave (into
50 ohms) to synchronize other instruments to the Main
Signal Outputs. (Paragraph 3-20)
EXT REF Input. Allows the instrument's internal
oscillator to phase-lock to an external frequency stan-
dard. (Paragraph 3-23)
Input Level: 0 to +20 dBm (50 ohm)
Input Frequency: within part per million of 10
MHz or a subharmonic of 10
MHz to 1 MHz
10 MHz OVEN Output. Option 004 instruments only.
Output signal from a temperature stabilized crystal
oscillator. Connects to the instrument with a special
BNC to BNC adapter (-hp- part number 1250-1499) to
the EXT REF Input. (Paragraph 3-23)
1 MHz REF Output. 1 MHz square wave derived from
the instrument's reference oscillator to phase-lock the
reference oscillator of another instrument to the Model
3336. (Paragraph 3-29)
PHASE MOD Input. Input for phase modulating signal.
(Paragraph 3-90)
AMPTD MOD Input. Input for amplitude modulating
signal. (Paragraph 3-85)
EXT LEVEL Input. Input from an external leveling
voltage source to regulate the signal amplitude at a
remote point. (Paragraph 3-53)
LEAVE DISCONNECTED UNLESS EXTERNAL LEVELING