INSTRUCTION
MANUAL
MANUAL DE INSTRUCCIONES
Model 1803D
Modelo 1803D
200 MHz FREQUENCY
COUNTER
200 MHz CONTADOR DE
FRECUENCIA
TEST INSTRUMENT SAFETY
WARNING
Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes b e
performed where exposed high voltage is present. An electrical shock causing 10 milliamps of current to pass through the hear t will stop
most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can prod uce a
lethal current under certain conditions. Higher voltages are even more dangerous. Your normal work habits should incl ude all accepted
practices to prevent contact with exposed high voltage, and to steer current away from your heart in case of accidental conta ct with a high
voltage. Observe the following safety precautions:
1. There is little danger of electrical shock from the dc output of this power supply because it can source 60 Vdc. There are several
other possible test conditions using this power supply that can create a high voltage shock hazard:
a. If the equipment under test is the “hot chassis” type, a serious shock hazard exists unless the equipment is unplugged (just turning
off the equipment does not remove the hazard), or an isolation transformer is used.
b. If the equipment under test is “powered up” (and that equipment uses high voltage in any of its circuits), the power supply outputs
may be floated to the potential at the point of connection. Remember that high voltage may appear at unexpected points in
defective equipment. Do not float the power supply output to more than 100 volts peak with respect to chassis or earth ground.
c. If the equipment under test is “off” (and that equipment uses high voltage in any of its circuits under normal operation), di scharge
high-voltage capacitors before making connections or tests. Some circuits retai n high voltage long after the equipment is turned
off.
2. Use only a polarized 3-wire ac outlet. This assures that the power supply chassis, case, and ground terminal are connected to a good
earth ground and reduces danger from electrical shock.
3. Don’t expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making test
connections in high-voltage circuits. Discharge high-voltage capacitors after removing power.
(continued on inside back cover)
TABLE OF CONTENTS
page
page
TEST INSTRUMENT SAFETY ----------inside front cover
INSTRUMENT REPAIR SERVICE......................... 10
SPECIFICATIONS .............................................................. 4
LIMITED ONE-YEAR WARRANTY ...................... 11
CONTROLS AND INDICATORS -------------------------- 6
SPANISH MANUAL ............................................. 16
OPERATING INSTRUCTIONS ....................................... 8
SPECIFICATIONS
MODES/FEATURES
Gate Times
Displayz
INPUT CHARACTERISTICS
1.0 sec and 0.1 sec gates.
7 digits
IMPEDANCE
Connector
Coupling
Sinewave Sensitivity
FREQUENCY CHARACTERISTICS
Range:
HF 10Hz to 25MHz
VHF 10MHz TO 200MHz
Maximum Input
HF 1MΩ
VHF 50Ω
BNC
D6
50mVrms, 10Hz to
200MHz
3V
Accuracy:
1.0 Sec Gate
0.1 Sec Gate
± Time base accuracy, ± 1
count
± Time base accuracy, ± 2
counts
TIME BASE CHARACTERISTICS
Type
Crystal Oscillator
Frequency
5.24288MHz
Stability
±10ppm
Temperature Stability
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