Model 5328A
Operation
3-48.
FUNCTION OF CONTROLS, INDICATORS, INPUTS AND OUTPUTS
-
3-49.
The following paragraphs provide a detailed description of the function of controls,
indicators, and connectors.
3-50.
Display
3-51. The 5328A display consists of an 8 (or
9
with the Option 030 channel C) digit numeric,
seven-segment LED display and annunciators for indicating the measurement units of Hz, SEC,
and VOLTS as well
as
M (10+6 or k
p
and n (10-9or IO+g).Thesedisplay unitsand
multipliers are automatically displayed along with the correct decimal point location. Overflow
(OF) indicates that left most significant digits have overflowed the display. Remote (RMT)
indicates that the counter (with Option 011 HP-IB interface)
is
under remote program control.
A GATE lamp
(G
is
displayed) indicates that the counter has been armed and that
a
measurment
is
in process.
3-52.
Power
WARNING
SAFETY PRECAUTIONS MUST ALWAYS BE OBSERVED
WHEN THE COVERS ARE REMOVED FROM THE
INSTRUMENT.
3-53. The POWER switch turns the counter ON or OFF (standby). The off position turns off
some but not all of the power supply voltages. This circuit arrangement allows the Option 010
high stability oscillator to operate continuously. Therefore, the input to main power transformer
(TI) plus the unregulated dc voltage to the oscillator oven
is
always energized whenever power
is
connected even with the POWER switch off.
3-54.
Reset
3-55.
The RESET pushbutton resets the display and internal count tozero and also initiatessingle
measurements when the SAMPLE RATE control
is
in the HOLD mode. On counters with Option
011 HP-IB Interface, providing remote control capability, pushing the RESET button restores the
counter to local control (when not remotely locked out by the HP-IB Local Lockout universal
command).
3-56.
Sample Rate Control
3-57.
The SAMPLE RATE control sets the minimum time between samples.
This time
is
continuously variable from less than
2
ms between measurements to HOLD, which holds the
display indefinitely. The counter will internally (self) arm (via the SAMPLE RATE control) only
when ARMING is OFF and the FUNCTION selected is other than FREQ A, FREQ
C,
and RATIO
C/A.
3-58.
Arming
3-59.
The counter may be armed internally (i.e., made ready to start
a
measurement) by the
SAMPLE RATE control, or externally by the input signal itself, (arming off) or by
a
signal not
directly involved in the measurement (arming on). Table
3-1
is
an arming status table. A rear
panel switch turns ARMING either ON or OFF. The counter isarmed within 1 llsecafter theevent
at the arming input.
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