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the Hewlett-Packard Interface Bus (H P-1 B) or the
Hewlett-Packard Interface Loop (HP-IL). Option 003
is HP-IL.
3-84.
The interface address switch (ADDR) is a
seven-position switch that is used to manually set the
remote control address of the counter. The five
rightmost switch positions are externally accessible
and can be used by the operator for setting the
address. The two leftmost switch positions are not
used for normal operation. For a complete descrip-
tion of address selection, refer to Table 3-4, Address
Selection, in the Remote Programming Instructions in
this section.
3-85.
The HP-IB and HP-IL capabilities of the counter
are listed above the interface port. For a complete de-
scription of the listed capabilities, refer to paragraph
3-118, Interface Commands.
3-86.
The AC LINE INPUT connector accepts the ac
input power cord. The protective grounding con-
ductor also connects to the instrument through the ac
power connector.
3-87.
The LINE SELECT switch selects the instrument
line voltage. The switch selects either 115 or 230 volts.
The number visible on the switch indicates the
nominal line voltage to which the instrument must be
connected for proper operation.
3-88.
The DC FUSE is a two-ampere fast-blow fuse
for the protection of the de power supply to the
instrument. The de fuse is the main protection for the
counter. The fuse value should be two ampere 3AG
fast-blow.
3-89.
The EXT DC INPUT power connector accepts
the two conductor de input power cable. Input volt-
age range is from 9 volts to 15 volts de and 1.0 ampere
maximum. The EXT DC INPUT is fuse protected for a
2.0 ampere surge current.
3-90.
The 10 MHz IN/OUT BNC connector provides
a 10 MHz signal that may be used for calibration when
the INT EXT switch is in the INT position. When the
INT EXT switch is in the EXT position, the IN/OUT
BNC connector becomes the external reference
input for the counter.
3-91.
EXTERNAL DC OPERATION
3-92.
For external de operation, connect the de
power cable to the EXT DC INPUT connector. Con-
nect the other end to a de power source of 9-15 volts
and 500 mA minimum. If Option 005 battery pack is
installed, the external de power source should provide
a minimum de current of 700 mA to allow for battery
charging.
HP 5384A and HP 5385A
Operation and Programming
3-93.
MAKING FREQUENCY AND
PERIOD MEASUREMENTS
I
WARNING
I
DURING BATTERY OPERATION WITH THE
MAINS POWER CORD DISCONNECTED FROM
THE MAINS SUPPLY, THE FRONT AND REAR
PANELS WILL FLOAT ATTHEVOLTAGEAPPLIED
TO SIGNAL COMMON (INPUT BNC CON-
NECTOR SHELL). TO AVOID THE RISK OF
ELECTRIC SHOCK DURING BATTERY OPER-
ATION, ENSURE THE VOLTAGE APPLIED TO
SIGNAL COMMON (BNC SHELL) DOES NOT
EXCEED 42V PEAK.
3-94.
The recommended sequence for setting-up
and making a measurement with the HP 5384A or HP
5385A Frequency counter is given below.
a.
Set the power switch to ON. The counter
should perform a power-up self-check, then preset to
the power-up initialize settings shown in Table 3-1.
b.
Press the key for the desired operating mode
(frequency, period etc.).
c.
Connect a signal into the channel selected.
d.
If
the display is unstable, use the attenuator,
filter, or manual trigger level control and adjust for a
stable reading. The above mentioned controls have
limitations. They cannot compensate for excessively
noisy or unstable signal sources.
e.
If desired, select a gate time and the number of
display digits desired.
NOTE
The display for frequency measurements of
less than Hertz will have a "less than" symbol
(<)on the left of the Hertz symbol (Hz). Refer
to Table 3-3.
Table 3-3. Units Display Format
FUNCTION
UNITS
<=8 DIGITS
>8 DIGITS
FREQUENCY AI
<HZ
<
FREQUENCY B
HZ
H
KHZ
K
MHZ
M
GHZ
G
PERIOD A
KSC
SEC
MS
us
NS
CHECK
MHZ
M
3-7
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