HP 5335A - Page 72

Operation and Programming
3-211, OPTIONS
3-212. The operating characteristics of the 5335A are affected by the addition of any of the
options described in the following paragraphs.
3-213, Time Base Option 010
3-214, Option 010 provides an Oven-Controlled Crystal Oscillator Time Base, that results
in higher accuracy and longer periods between calibration (refer to Table 1-1). The oven
temperature is maintained when the 5335A LINE switch is in either the ON or the STBY position
(provided the instrument is connected to the power mains).
NOTE
The Option 010 Oven-Controlled-Oscillator, HP Model 10811 A,
is a direct replacement for the previous HP Model 10544A.
Service documentation for the older 10544A is provided in
SECTION VIiI under Assembly A12 Oven Oscillator. All service
documentation for the newer HP 1Q811A is provided in the
HP 10811A Operating and Service Manual, (HP Part Number
10811-90002) included with Option 010.
3-215. Digital Voltmeter Option 020
3-216. Option 020 provides a fully floating, autoranging digital voltmeter. This module
measures dc inputs up to 1000 volts through front panel connectors. Refer to Specificatons,
Table 1-1, for the specific operating characteristics.
3-217. C Channel Option 030
3-218. Option 030 provides a C Channel Input Module, which expands the frequency
counting range of the counter to 1.3 GHz. A front panel control adjusts the input sensitivity.
A front panel preamp power receptacle is provided. Refer to Specifications, Table 1-1, for the
specific operating characteristics.
3-219. OPERATOR'S MAINTENANCE
3-220. The only maintenance the operator should normally performs is replacement of the
primary power fuse located within the Line Module Assembly. For instructions on how to
change the fuse, refer to Section II, Line Voltage Selection.
fc autionI
Make sure that only fuses with the required rated current and
of the slow-bfow type are used for replacement. The use of re¬
paired fuses and the short-circuiting of fuse-holders must be
avoided.
3-221. When Option 030 C Channel is installed, the operator may be required to replace the
input BNC fuse. This is a 1/8A fuse (HP Part No. 2110-0301) which is located within the INPUT C
BNC connector (see Figure 3-4 for details). To replace the fuse, disconnect the power cord,
unscrew the special BNC barrel (P/N 05305-60205) and, with needle-nose pliers, remove and
replace the fuse. Reinstall the BNC barrel, and tighten using a BNC cable connector. Be careful
not to overtighten.
3-56
Model 5335A