Operatinq Precautions

use the adapter wherever possible for accurate

measurements above 100 Mc.

a. Maximum Input Voltages:

RF voltages exceeding 10 Volts must not be applied to

the probe or permanent damage to the crystal diodes

may result. The

Adapter should not be subjected

to continuous overloads exceeding 10 Volts to avoid

excessive heating of terminating resistor.

Maximum DC voltage for RF Probe is 400 Volts.

Adapter is 10 Volts.

Maximum DC voltage for

Note: Do not apply maximum DC voltage simultaneously

Adapter.

with maximum RF voltage when using

b. Temperature Effects:

The normal ambient temperature range for specified

accuracy is 65° to 90° F. Appreciable inaccuracies can

be expected while the probe is exposed to temperatures

above or below this range. No permanent change in

probe characteristics will result from the high or low

temperature exposure.

Inaccuracies due to temperature effects may occur after

soldering to the probe Tip or from heat sources such as

resistors or tubes.

When making low level measurements in the order of 2

millivolts or less, it is important to make sure that

the probe has attained a uniform temperature throughout.

A temperature difference between the inside and outside

of the probe can generate a small thermal voltage that

may add to or subtract from the DC voltage generated by

the diodes.

AN/URM-145