# devices.keithley:Keithley2182A


Keithley2182A nanovoltmeter instrument driver.


Usage

``` python
devices.keithley:Keithley2182A(
    interface,
    **kwargs,
)
```


Provides methods to control and interface with a Keithley 2182A nanovoltmeter over a VISA connection.


## Parameters


`interface: str`  
VISA resource name for connecting to the instrument

`**kwargs: dict`  
Additional parameters to pass to the VISA connection


## Attributes


`config_params: dict`  
Dictionary of common configuration parameter queries

`triggered: bool`  
Flag indicating if a measurement has been triggered

`interface: str`  
The VISA resource name used for this connection


## Methods

| Name | Description |
|----|----|
| [configure()](#configure) | Configure the Keithley 2182A to detect voltages. |
| [getReading()](#getReading) | Get the most recent reading from the instrument. |
| [query()](#query) | Send a query to the instrument and return the response. |
| [triggerReading()](#triggerReading) | Trigger a measurement reading on the instrument. |

------------------------------------------------------------------------


### configure()


Configure the Keithley 2182A to detect voltages.


Usage

``` python
configure(
    digits=None,
    count=None,
    window=None,
    NPLC=None,
    dFil=None,
    voltage_range=None,
    rangeAuto=None,
    trigBus=None,
    delay=None,
    repeatingFilter=None,
    reset=False,
)
```


#### Parameters


`digits: int = None`  
Number of digits to display (4-8)

`count: int = None`  
Filter count for the digital filter

`window: float = None`  
Filter window for the digital filter

`NPLC: int or float = None`  
Number of power line cycles to integrate over

`dFil: bool = None`  
If True, turn on the digital filter. If False, window and filter count are ignored

`voltage_range: float = None`  
Range of the voltage detection. Selected by the instrument to include the value

`rangeAuto: bool = None`  
Automatic detection of the measurement range. Takes additional time during measurements

`trigBus: bool = None`  
Sets trigger source to BUS if True

`delay: float = None`  
Delay between trigger and measurement when trigBus is True. If None, AUTO mode is used.

`repeatingFilter: bool = None`  
If True set the filter to repeating, if False to moving

`reset: bool = ``False`  
If True, the device is reset prior to configuration (default False)


#### Returns


`None`  


------------------------------------------------------------------------


### getReading()


Get the most recent reading from the instrument.


Usage

``` python
getReading()
```


Should be called after triggering a reading with triggerReading(). Resets the triggered flag to False after retrieving the reading.


#### Returns


`float`  
The measured voltage value


#### Notes

Returns None if no reading has been triggered.

------------------------------------------------------------------------


### query()


Send a query to the instrument and return the response.


Usage

``` python
query(
    *args,
    **kwargs,
)
```


Overrides the parent class query method.


#### Parameters


`*args: tuple`  
Variable length argument list to pass to the parent query method

`**kwargs: dict`  
Arbitrary keyword arguments to pass to the parent query method


#### Returns


`str`  
The response from the instrument


------------------------------------------------------------------------


### triggerReading()


Trigger a measurement reading on the instrument.


Usage

``` python
triggerReading()
```


Sets the triggered flag to True after a trigger has been sent. This prevents multiple triggers from being sent before a reading is retrieved.


#### Returns


`None`