HP 5335A - Page 73

Operation and Programming
3-222. Power/Warm-Up
3-223. The HP Model 5335A requires a power source of 100, 120, 220, or 240V ac, 4-5%, -10%,
48 to 66 Hz single phase. The selection of line voltage and input power fuse is described in
Section II, paragraph 2-5, Preparation for Use.
3-224. The 5335A has a two-position power switch, STBY and ON. For 5335A Option 010 only,
it is important that the instrument remain connected to the power source in the STBY mode
when not in use. This supplies power to the crystal oven maintaining a constant oven tempera¬
ture, thus eliminating the need for a warm-up period. When the STBY mode is not used and
power is disconnected from the instrument, allow 30 minutes from the application of external
power in the ON mode for the instrument (crystal oven) to warm-up.
POWER IS ALWAYS PRESENT AT THE LINE SWITCH AND
TRANSFORMER, AND UNREGULATED DC IS PRESENT WHEN¬
EVER THE LINE CORD IS ATTACHED. UNPLUGGING THE
POWER CORD IS NECESSARY TO REMOVE ALL POWER FROM
THE INSTRUMENT.
3-225 OPERATOR'S CHECK
3-226. The following procedures will verify the basic operation of the HP5335A Universal
Counter. These tests are not intended to verify the overall accuracy or performance specifications
of the instrument. They should, however, provide the operator a quick method of determining
that the counter is operating properly. The tests are provided in two levels; a DISPLAY CHECK and
a FRONT PANEL CHECK. The operator should perform both tests.
A. DISPLAY CHECK
To perform the HP5335A DISPLAY CHECK, momentarily press the key labeled “CHECK".
Verify that all display annunciators, except “STBY" and the A and B Channel Trigger
lights, cycle ON and OFF. Pressing any Function key will return normal operation.
3-57
Model 5335A