Instruction manual

20
Input C has a built in impedance of 50Ω, thus the need for an external
termination is eliminated.
In situations where a 50Ω termination could affect bias voltages or other DC
voltages in the circuit under test, a blocking capacitor should be used.
5-2. Attenuator Probes
When measuring signals at input A that will exceed its maximum input voltage
level (See FIG. 1), a 10:1 attenuating probe such as an oscilloscope probe should
be used.
NOTE
DO NOT USE A 10:1 PROBE WITH THE INPUT C. THESE PROBES ARE
DESIGNED WITH A 10:1 ATTENUATION FOR AN INSTRUMENT WITH AN
INPUT RESISTANCE OF 1 M Ω. THE 50 Ω TERMINATION OF INPUT C WOULD
RESULT IN UNACCEPTABLY HIGH ATTENUATION.
5-3. Line Frequency Measurements
When making line frequency measurements, use of the LOW PASS FILTER, the
ATTENUATOR, and/or the 10:1 probe is recommended.
WARNING
USE CAUTION WHEN MEASURING THE LINE FREQUENCY OF AN AC
OUTLET. USE THE PROBE TIP ONLY, AND MEASURE BOTH SIDES OF THE
LINE. THE NEUTRAL SIDE WILL GIVE A ZERO READING AND THE HOT SIDE
WILL PROVIDE THE DESIRED MEASUREMENT. DO NOT USE THE "GROUND"
LEAD OF THE PROBE. REMEMBER THAT THE CHASSIS OF THE COUNTER
AND THE “GROUND” LEAD OF THE PROBE ARE ALREADY AT EARTH