[SENSe:]{FREQuency|PERiod} Subsystem

This subsystem configures frequency and period measurements.

Command Summary

[SENSe:]{FREQuency|PERiod}:APERture

[SENSe:]{FREQuency|PERiod}:NULL[:STATe]

[SENSe:]{FREQuency|PERiod}:NULL:VALue

[SENSe:]{FREQuency|PERiod}:NULL:VALue:AUTO

[SENSe:]{FREQuency|PERiod}:RANGe:LOWer

[SENSe:]{FREQuency|PERiod}:TIMeout:AUTO

[SENSe:]{FREQuency|PERiod}:VOLTage:RANGe

[SENSe:]{FREQuency|PERiod}:VOLTage:RANGe:AUTO

[SENSe:]FREQuency:SECondary

[SENSe:]PERiod:SECondary

[SENSe:]{FREQuency|PERiod}:APERture {<seconds>|MIN|MAX|DEF}
[SENSe:]{FREQuency|PERiod}:APERture? [{MIN|MAX|DEF}]

Sets the aperture time (gate time) for frequency and period measurements.

Note This parameter is shared between frequency and period measurements. Setting or querying the parameter with the FREQuency version of this command is identical to setting or querying it with the PERiod version.

Parameter Typical Return
{1 ms|10 ms|100 ms|1 s}. Default: 100 ms. +1.00000000E-01
Configure frequency measurements using a 1 s aperture, make a measurement, and return the result:

CONF:FREQ
FREQ:APER 1
READ?

Resolution (34460A/61A) Resolution (34465A/70A) Aperture
Not Applicable 100 ppm × <range> (MAXimum) 1 ms
100 ppm × <range> (MAXimum) 10 ppm × <range> (DEFault) 10 ms
10 ppm × <range> (DEFault) 1 ppm × <range> 100 ms
1 ppm × <range> (MINimum) 0.1 ppm × <range> (MINimum) 1 s

[SENSe:]{FREQuency|PERiod}:NULL[:STATe] {ON|1|OFF|0}
[SENSe:]{FREQuency|PERiod}:NULL[:STATe]?

Enables or disables the null function for frequency and period measurements.

Note Unlike the SENSe:FREQuency and SENSe:PERiod range and aperture commands, this parameter is not shared between frequency and period measurements. The null parameters are independent for frequency and period measurements.

Parameter Typical Return
{ON|1|OFF|0}. Default: OFF. 0 (OFF) or 1 (ON)

Configure frequency measurements, using the null function to subtract 1kHz from the measurements. Make and read two measurements:
CONF:FREQ
FREQ:NULL:STAT ON;VAL 1 kHz
SAMP:COUN 2
READ?

Typical Response: +1.04530000E+03,+1.04570000E+03

[SENSe:]{FREQuency|PERiod}:NULL:VALue {<value>|MIN|MAX|DEF}
[SENSe:]{FREQuency|PERiod}:NULL:VALue? [{MIN|MAX|DEF}]

Stores a null value for frequency and period measurements.

Note Unlike the SENSe:FREQuency and SENSe:PERiod range and aperture commands, this parameter is not shared between frequency and period measurements. The null parameters are independent for frequency and period measurements.

Parameter Typical Return

Frequency: -1.2E6 to +1.2E6. Default: 0.
Period: -1.2 to +1.2 seconds. Default: 0.

+1.00000000E-02

Configure frequency measurements, using the null function to subtract 1kHz from the measurements. Make and read two measurements:
CONF:FREQ
FREQ:NULL:STAT ON;VAL 1 kHz
SAMP:COUN 2
READ?

Typical Response: +1.04530000E+03,+1.04570000E+03

[SENSe:]{FREQuency|PERiod}:NULL:VALue:AUTO {ON|1|OFF|0}
[SENSe:]{FREQuency|PERiod}:NULL:VALue:AUTO?

Enables or disables automatic null value selection for frequency and period measurements.

Note Unlike the SENSe:FREQuency and SENSe:PERiod range and aperture commands, this parameter is not shared between frequency and period measurements. The null parameters are independent for frequency and period measurements.

Parameter Typical Return
{ON|1|OFF|0}. Default: OFF. 0 (OFF) or 1 (ON)

Configure frequency measurements, using the null function to subtract 1 kHz from them.  Make and read two measurements:
CONF:FREQ
FREQ:NULL:STAT ON;VAL 1 kHz
SAMP:COUN 2
READ?

Typical Response: +1.04530000E+00,+1.04570000E+00

Make a second set of measurements using automatic null value selection:
FREQ:NULL:VAL:AUTO ON
READ?

Typical Response: +0.00000000E+00,+0.01420000E+00

[SENSe:]{FREQuency|PERiod}:RANGe:LOWer {<freq>|MIN|MAX|DEF}
[SENSe:]{FREQuency|PERiod}:RANGe:LOWer? [{MIN|MAX|DEF}]

Sets the AC bandwidth used to detect the signal during frequency and period measurements.

Note This parameter is shared between frequency and period measurements. Setting or querying the parameter with the FREQuency version of this command is identical to setting or querying it with the PERiod version.

The instrument uses three different AC filters that enable you either to optimize low frequency accuracy or to achieve faster AC settling times following a change in input signal amplitude. The instrument selects the slow (3 Hz), medium (20 Hz) or fast (200 Hz) filter based on the cutoff frequency specified by this command. Specify the lowest frequency that you expect to encounter.

Parameter Typical Return
{3 Hz|20 Hz|200 Hz}. Default: 20Hz. +6.27530000E+03
Make and read a frequency measurement. Use the 3 Hz filter bandwidth:

CONF:FREQ
FREQ:RANG:LOW 3
READ?

[SENSe:]{FREQuency|PERiod}:TIMeout:AUTO {ON|1|OFF|0}
[SENSe:]{FREQuency|PERiod}:TIMeout:AUTO?

Controls how long the instrument waits before timing out on a frequency or period measurement when no signal is present.

Parameter Typical Return
{ON|1|OFF|0}. Default: OFF. 0 (OFF) or 1 (ON)

Configure frequency measurements, using the null function to subtract 1kHz from the measurements. Enable the automatic timeout. Make and read two measurements:
CONF:FREQ
FREQ:NULL:STAT ON;VAL 1 kHz
TIM:AUTO ON
SAMP:COUN 2
READ?

Typical Response: +1.04530000E+03,+1.04570000E+03

[SENSe:]{FREQuency|PERiod}:VOLTage:RANGe {<range>|MIN|MAX|DEF}
[SENSe:]{FREQuency|PERiod}:VOLTage:RANGe? [{MIN|MAX|DEF}]

Selects a fixed voltage range for frequency and period measurements.

Note This parameter is shared between frequency and period measurements. Setting or querying the parameter with the FREQuency version of this command is identical to setting or querying it with the PERiod version.

Warning

The maximum range parameter (MAX) is 1000 V. However, the SAFETY LIMIT on the front and rear HI/LO input terminals is 750 VAC (rms). The rms voltage is waveform dependent. A sine wave is limited to 750 VAC (rms), but a 1000 Vpk square wave is safe. Connection to AC mains power is further limited to CAT II (300 V). See Safety and Regulatory Information for more information on the safety features and the safe operation of this instrument.

Parameter Typical Return
<range>: {100 mV|1 V|10 V|100 V|1000 V}. Default: 10V +1.04530000E+03
Configures frequency measurements using the 10 VAC range.  Make and read two measurements:

CONF:FREQ
FREQ:VOLT:RANG 10
SAMP:COUN 2
READ?

[SENSe:]{FREQuency|PERiod}:VOLTage:RANGe:AUTO {OFF|ON|ONCE}
[SENSe:]{FREQuency|PERiod}:VOLTage:RANGe:AUTO?

Disables or enables voltage autoranging for frequency and period measurements. Autoranging is convenient because it automatically selects the range for each measurement based on the input signal.

Specifying ONCE performs an immediate autorange and then turns autoranging off.

Note This parameter is shared between frequency and period measurements. Setting or querying the parameter with the FREQuency version of this command is identical to setting or querying it with the PERiod version.

Warning

The maximum range parameter (MAX) is 1000 V. However, the SAFETY LIMIT on the front and rear HI/LO input terminals is 750 VAC (rms). The rms voltage is waveform dependent. A sine wave is limited to 750 VAC (rms), but a 1000 Vpk square wave is safe. Connection to AC mains power is further limited to CAT II (300 V). See Safety and Regulatory Information for more information on the safety features and the safe operation of this instrument.


Parameter Typical Return
{OFF|ON|ONCE}. Default: ON. 0 (OFF) or 1 (ON)

Configure frequency measurements and perform an immediate AC voltage autorange.  Make and read two measurements:
CONF:FREQ
FREQ:VOLT:RANG:AUTO ONCE
SAMP:COUN 2
READ?

Typical Response: +1.04530000E+03,+1.04570000E+03

[SENSe:]FREQuency:SECondary {"OFF"|"CALCulate:DATA"|"PERiod"|"VOLTage:AC"}
[SENSe:]FREQuency:SECondary?

Selects the secondary measurement function for frequency measurements.

Parameter Typical Return

{"OFF"|"CALCulate:DATA"|"PERiod"|"VOLTage:AC"}, default "OFF"

"CALC:DATA"

Configure frequency measurements, select period as the secondary measurement, make and retrieve measurements.

CONF:FREQ MAX, MAX
FREQ:SEC "PERiod"
READ?;DATA2?

Typical Response: +1.22230020E+02;+8.18129619E-03

[SENSe:]PERiod:SECondary {"OFF"|"CALCulate:DATA"|"FREQuency"|"VOLTage:AC"}
[SENSe:]PERiod:SECondary?

Selects the secondary measurement function for period measurements.

Parameter Typical Return

{"OFF"|"CALCulate:DATA"|"FREQuency"|"VOLTage:AC"}, default "OFF"

"CALC:DATA"

Configure period measurements, select frequency as the secondary measurement, make and retrieve measurements.

CONF:PER MAX, MAX

PER:SEC "FREQ"

READ?;DATA2?

Typical Response: +8.90363477E-03;+1.12313682E+02