Keysight 34972A - Frequency Measurement Configuration; Low Frequency Timeout

Features and Functions 4
Keysight 34970A/34972A User’s Guide 147
Frequency Measurement Configuration
To connect an AC source to the module’s screw terminals, see page 39.
Low frequency timeout
The instrument uses three different timeout ranges for frequency measurements.
The instrument selects a slow, medium, or fast timeout based on the input
frequency that you specify for the selected channels.
– The instrument selects the medium timeout (20 Hz) when the function is
changed or after a Factory Reset (*RST command). An Instrument Preset
(SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does
not change the setting.
– Front Panel Operation. First, select the frequency function on the active
channel. Then, go to the Advanced menu and select the slow timeout (3 Hz),
medium timeout (20 Hz), or fast timeout (200 Hz) for the active channel. The
default is the medium timeout value.
LF 3 HZ:SLOW
– Remote Interface Operation: Specify the lowest frequency expected in the
input signal on the specified channels. The instrument selects the appropriate
timeout based on the frequency you specify (see table above). The MEASure?
and CONFigure commands automatically select the 20 Hz (medium) timeout.
Input frequency Default settling delay
3 Hz to 300 kHz (Slow)
20 Hz to 300 KHz (Medium)
200 Hz to 300 kHz (Fast)
1 s
100 ms
10 ms
SENS:FREQ:RANG:LOW 3,(@203) Select the slow timeout (3 Hz)