BK Precision 1803D Manual De Instrucciones página 8

OPERATING INSTRUCTIONS
WARNING
Some operating conditions may pose an electrical shock
hazard. Know and observe the precautions described in the
"Test Instrument Safety" section.
2. Connect the AC Adapter to an ac outlet and plug into the
rear panel jack of the frequency counter.
3. Set the POWER/GATE TIME switch to 0.IS or 1.0 S.
a. Use 0.1S for faster measurement of high frequency
signals. The update time of the display is every 0.2
second. Resolution is 10Hz.
b. Use I.OS for measurement of low frequencies or
where highest resolution is needed. The update
time of the display is every 2 seconds. Resolution
is 1Hz.
4. Apply the 10Hz to 200MHz signals to be measured to
the input jack.
To prevent damage to the unit, do not apply input voltage higher that the
limits listed in the "Specifications" section. Connect the instrument ground
lead only to zero volt points in the circuit under test. Attempting to "float" the
unit may result in a shock hazard, since the instrument ground is exposed at
the front panel BNC connector.
If measuring ac line frequency, observe the precautions listed in the "Line
Voltage Measurement" paragraph.
1. .Frequency is given by the front panel display. The decimal point is
automatically positioned.
a. With a 1.0S gate time, readings below 1MHz are given in decimal
MHz, above MHz, they are in whole megahertz. For example,
12KHz is displayed as.012000, and 12MHz is 12.000000.
b. With a 0.1S gate time, all readings are displayed in MHz, and with
one less digit resolution. For example, 12KHz is displayed as
0.01200, and 12MHzis 12.000000.
5. Measurement interval, or "gate time", is 1.0 second or 0. I second. This is
combined with an additional interval of equal time for internal latching
and resetting, for a total of 2 seconds between display updated when 1.0S
gate time is selected or 0.2 seconds when 0.1S gate time is selected.
6. The OVER flow indicator lights whenever the range of the display
(199.9999MHz) is exceeded.
8
CAUTION