HP 5384A Operating And Service Manual page 36

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HP 5384A and HP 5385A
Operation and Programming
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(hp 5384A FREQUENCY COUNTER
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PACKARD
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INPUTS
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POWER
STBY/ON
(A) FREQ
X20 ATTN
A
B
A
The switch connects or disconnects the output of the +5 volt power''supply to the rest of
the instrument. Does not control the AC line .
The key selects the frequency mode of operation for channel A. Max. display digits: 11; Min. 3
Enables or disables a X20 attenuator in the channel A input.
(A) PER The key selects the Period measurement mode of Channel A. Max. display digits: 9; Min. 3.
(A) Fl LTER 100 kHz The key switches the 100 kHz Low Pass Filter in or out of the Channel A signal path .
MAN LEVEL The key enables or disables the front panel MANUAL TRIG LEVEL A/MANUAL ATTN LEVEL B
control.
f)
(B) FREQ The key selects Channel B frequency mode for measurement.
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GATE The three GATE keys select ranges of gate times.
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DISPLAY DIGITS These keyes are used to change the resolution of the display. NORM (normal) displays eight
digits. The
+
key increases the number of display digits to a maximum of 11 and the
+
key decreases the number of display digits to a minimum of 3 in frequency mode.
G)
CHECK The CHECK key is used to verify proper operation of the oscillator, count logic, micro-
processor and the display. The correct display is 10 MHz ±1 least significant digit.
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RESET /LOCAL In LOCAL operation, the key causes the display to reset, the present measurement
to be terminated and a new measurement initiated. In remote the key causes the instrument
to go into the local mode of operation with all input controls remaining in their last
state. A new measurement is initiated with the display reset to "00000000" and the REM
annunciator diappears.
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A Input A Channel input. See Table 1-1 for specifications.
G)
B Input B Channel input. See Table 1-1 for specifications.
The HP 53B5A has a fuse in the BNC connector. Refer to Figure 2-5 for replacement.
MANUAL TRIG With the MAN LVL (manual level) key enabled, an arrow appears in the LCD above the
LEVEL A/MANUAL label and the MANUAL TRIG LEVEL A/MANUAL ATTN LEVEL B has control to adjust the trigger
ATTN LEVEL B level of Channel A and the input attenuation of Channel B.
Channel A trigger level is variable from +0.1 to -0.1 volts (midrange is O.OV and maximum
sensitivity) .
Channel B attenuation is variable from X1 to XS nominal for the HP 5384A.
Channel B attenuation is variable from X1 to X18 nominal for the HP 5385A.
Figure 3-8. Front Panel Controls
3-9