HP Signal generator HP8657B
- Note:
This instrument does not support reading back values, as it is a listen-only GPIB device.
Other instruments of this family could be implemented using the dynamic ranges feature.
Optional pulse modulation feature is not supported yet.
- Glossary:
Abbreviation
Explanation
AM
Amplitude Modulation
FM
Frequency Modulation
dBm
power level in dB referenced to 1mW
- class pymeasure.instruments.hp.HP8657B(adapter, name='Hewlett-Packard HP8657B', **kwargs)
Bases:
Instrument
Represents the Hewlett Packard 8657B signal generator and provides a high-level interface for interacting with the instrument.
- class Modulation(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)
Bases:
IntEnum
IntEnum for the different modulation sources
- property am_depth
Set the modulation depth for AM, usable range 0-99.9%
- property am_source
Set the source for the AM function with
Modulation
enumeration.Value
Meaning
OFF
no modulation active
INT_400HZ
internal 400 Hz modulation source
INT_1000HZ
internal 1000 Hz modulation source
EXTERNAL
External source, AC coupling
- Note:
AM & FM can be active at the same time
only one internal source can be active at the time
use “OFF” to deactivate AM
usage example:
sig_gen = HP8657B("GPIB::7") ... sig_gen.am_source = sig_gen.Modulation.INT_400HZ # Enable int. 400 Hz source for AM sig_gen.am_depth = 50 # Set AM modulation depth to 50% ... sig_gen.am_source = sig_gen.Modulation.OFF # Turn AM off
- check_errors()
Method to read the error status register as the 8657B does not support any readout of values, this will return 0 and log a warning
- clear()
Reset the instrument to power-on default settings
- property fm_deviation
Set the peak deviation in kHz for the FM function, useable range 0.1 - 400 kHz
- NOTE:
the maximum usable deviation is depending on the output frequency, refer to the instrument documentation for further detail.
- property fm_source
Set the source for the FM function with
Modulation
enumeration.Value
Meaning
OFF
no modulation active
INT_400HZ
internal 400 Hz modulation source
INT_1000HZ
internal 1000 Hz modulation source
EXTERNAL
External source, AC coupling
DC_FM
External source, DC coupling (FM only)
- Note:
AM & FM can be active at the same time
only one internal source can be active at the time
use “OFF” to deactivate FM
refer to the documentation rearding details on use of DC FM mode
usage example:
sig_gen = HP8657B("GPIB::7") ... sig_gen.fm_source = sig_gen.Modulation.EXTERNAL # Enable external source for FM sig_gen.fm_deviation = 15 # Set FM peak deviation to 15 kHz ... sig_gen.fm_source = sig_gen.Modulation.OFF # Turn FM off
- property frequency
Set the output frequency of the instrument in Hz.
For the 8567B the valid range is 100 kHz to 2060 MHz.
- id = 'HP,8657B,N/A,N/A'
Manual ID entry
- property level
Set the output level in dBm.
For the 8657B the range is -143.5 to +17 dBm/
- property level_offset
Set the output offset in dB, usable range -199 to +199 dB.
- property output_enabled
Control whether the output is enabled.
- reset()
Resets the instrument.
- shutdown()
Brings the instrument to a safe and stable state