1
Getting Started
50
Keysight 53147A/148A/149A Operating and Programming Guide
NOTE
– The Counter displays CH2 NO SIGNAL or CH1 NO SIGNAL and shuts down all
unnecessary circuits when a signal of insufficient amplitude (or no signal) is
applied to the corresponding input. This lowers the power consumption, and
if the Battery option is installed, it extends the length of time the instrument
can operate from the batteries.
– When the frequency of a signal applied to the Channel 2 input exceeds the
maximum rated frequency for the Counter, it displays CH2 TOO HIGH.
– The DVM uses the same portion of the display to display voltage
measurements that the instrument uses to display frequency measurements.
Therefore, the DVM and the Counter cannot display measurements
simultaneously. Pressing the
Display DVM
key toggles the upper portion of
the display between the DVM and the Counter.
CAUTION
The 2.9 mm Planar Crown
[a]
connector used for the Channel 2 input on the
Keysight 53149A must be handled with care to prevent damage and/or
contamination, especially since it acts as a wave guide as well as an
electrical connection. Observe the following precautions when handling this
connector:
1
If you remove the outer portion of the connector, do not touch the
exposed surfaces of either part of the connector with your bare skin or
any material that is not intended for cleaning this type of connector.
2
Avoid dropping or striking either portion of the connector.
If the connector becomes contaminated, it can be cleaned with isopropyl
alcohol and a lint-free cloth or other suitable cleaning implement.
[a] Planar Crown
®
is a registered trademark of Weinschel Corp.
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