Hewlett-Packard¶
HP3456a
Digital Voltmeter¶
- class instruments.hp.HP3456a(filelike)[source]¶
The
HP3456a
is a 6 1/2 digit bench multimeter.It supports DCV, ACV, ACV + DCV, 2 wire Ohms, 4 wire Ohms, DCV/DCV Ratio, ACV/DCV Ratio, Offset compensated 2 wire Ohms and Offset compensated 4 wire Ohms measurements.
Measurements can be further extended using a system math mode that allows for pass/fail, statistics, dB/dBm, null, scale and percentage readings.
HP3456a
is a HPIB / pre-448.2 instrument.- class MathMode(value)[source]¶
Enum with the supported math modes
- db = 9¶
- dbm = 4¶
- null = 3¶
- off = 0¶
- pass_fail = 1¶
- percent = 8¶
- scale = 7¶
- statistic = 2¶
- thermistor_c = 6¶
- thermistor_f = 5¶
- class Mode(value)[source]¶
Enum containing the supported mode codes
- acv = 'S0F2'¶
AC voltage
- acvdcv = 'S0F3'¶
RMS of DC + AC voltage
- dcv = 'S0F1'¶
DC voltage
- oc_resistence_2wire = 'S1F4'¶
offset compensated 2 wire resistance
- oc_resistence_4wire = 'S1F5'¶
offset compensated 4 wire resistance
- ratio_acv_dcv = 'S1F2'¶
ratio AC / DC voltage
- ratio_acvdcv_dcv = 'S1F3'¶
ratio (AC + DC) / DC voltage
- ratio_dcv_dcv = 'S1F1'¶
ratio DC / DC voltage
- resistance_2wire = 'S0F4'¶
2 wire resistance
- resistance_4wire = 'S0F5'¶
4 wire resistance
- class Register(value)[source]¶
Enum with the register names for all
HP3456a
internal registers.- count = 'C'¶
- delay = 'D'¶
- lower = 'L'¶
- mean = 'M'¶
- nplc = 'I'¶
- number_of_digits = 'G'¶
- number_of_readings = 'N'¶
- r = 'R'¶
- upper = 'U'¶
- variance = 'V'¶
- y = 'Y'¶
- z = 'Z'¶
- class TriggerMode(value)[source]¶
Enum with valid trigger modes.
- external = 2¶
- hold = 4¶
- internal = 1¶
- single = 3¶
- class ValidRange(value)[source]¶
Enum with the valid ranges for voltage, resistance, and number of powerline cycles to integrate over.
- nplc = (0.1, 1.0, 10.0, 100.0)¶
- resistance = (100.0, 1000.0, 10000.0, 100000.0, 1000000.0, 10000000.0, 100000000.0, 1000000000.0)¶
- voltage = (0.1, 1.0, 10.0, 100.0, 1000.0)¶
- auto_range()[source]¶
Set input range to auto. The
HP3456a
should upscale when a reading is at 120% and downscale when it below 11% full scale. Note that auto ranging can increase the measurement time.
- fetch(mode=None)[source]¶
Retrieve n measurements after the HP3456a has been instructed to perform a series of similar measurements. Typically the mode, range, nplc, analog filter, autozero is set along with the number of measurements to take. The series is then started at the trigger command.
Example usage:
>>> dmm.number_of_digits = 6 >>> dmm.auto_range() >>> dmm.nplc = 1 >>> dmm.mode = dmm.Mode.resistance_2wire >>> n = 100 >>> dmm.number_of_readings = n >>> dmm.trigger() >>> time.sleep(n * 0.04) >>> v = dmm.fetch(dmm.Mode.resistance_2wire) >>> print len(v) 10
- Parameters:
mode (
HP3456a.Mode
) – Desired measurement mode. If not specified, the previous set mode will be used, but no measurement unit will be returned.- Returns:
A series of measurements from the multimeter.
- Return type:
- measure(mode=None)[source]¶
Instruct the HP3456a to perform a one time measurement. The measurement will use the current set registers for the measurement (number_of_readings, number_of_digits, nplc, delay, mean, lower, upper, y and z) and will immediately take place.
Note that using
HP3456a.measure()
will override thetrigger_mode
toHP3456a.TriggerMode.single
Example usage:
>>> dmm = ik.hp.HP3456a.open_gpibusb("/dev/ttyUSB0", 22) >>> dmm.number_of_digits = 6 >>> dmm.nplc = 1 >>> print dmm.measure(dmm.Mode.resistance_2wire)
- Parameters:
mode (
HP3456a.Mode
) – Desired measurement mode. If not specified, the previous set mode will be used, but no measurement unit will be returned.- Returns:
A measurement from the multimeter.
- Return type:
- property autozero¶
Set the autozero mode.
This is used to compensate for offsets in the dc input amplifier circuit of the multimeter. If set, the amplifier”s input circuit is shorted to ground prior to actual measurement in order to take an offset reading. This offset is then used to compensate for drift in the next measurement. When disabled, one offset reading is taken immediately and stored into memory to be used for all successive measurements onwards. Disabling autozero increases the
HP3456a
”s measurement speed, and also makes the instrument more suitable for high impendance measurements since no input switching is done.
- property count¶
Get the number of measurements taken from
HP3456a.Register.count
when inHP3456a.MathMode.statistic
.- Return type:
- property delay¶
Get/set the delay that is waited after a trigger for the input to settle using
HP3456a.Register.delay
.- Type:
As specified, assumed to be
s
otherwise- Return type:
s
- property filter¶
Set the analog filter mode.
The
HP3456a
has a 3 pole active filter with greater than 60dB attenuation at frequencies of 50Hz and higher. The filter is applied between the input terminals and input amplifier. When in ACV or ACV+DCV functions the filter is applied to the output of the ac converter and input amplifier. In these modes select the filter for measurements below 400Hz.
- property input_range¶
Set the input range to be used.
The
HP3456a
has separate ranges forohm
and forvolt
. The range value sent to the instrument depends on the unit set on the input range value.auto
selects auto ranging.- Type:
- property lower¶
Get/set the value in
HP3456a.Register.lower
, which indicates the lowest value measurement made while inHP3456a.MathMode.statistic
, or the lowest value preset forHP3456a.MathMode.pass_fail
.- Type:
- property math_mode¶
Set the math mode.
The
HP3456a
has a number of different math modes that can change measurement output, or can provide additional statistics. Interaction with these modes is done via theHP3456a.Register
.- Type:
- property mean¶
Get the mean over
HP3456a.Register.count
measurements fromHP3456a.Register.mean
when inHP3456a.MathMode.statistic
.- Return type:
- property mode¶
Set the measurement mode.
- Type:
- property nplc¶
Get/set the number of powerline cycles to integrate per measurement using
HP3456a.Register.nplc
.Setting higher values increases accuracy at the cost of a longer measurement time. The implicit assumption is that the input reading is stable over the number of powerline cycles to integrate.
- Type:
- property number_of_digits¶
Get/set the number of digits used in measurements using
HP3456a.Register.number_of_digits
.Set to higher values to increase accuracy at the cost of measurement speed.
- Type:
- property number_of_readings¶
Get/set the number of readings done per trigger/measurement cycle using
HP3456a.Register.number_of_readings
.
- property r¶
Get/set the value in
HP3456a.Register.r
, which indicates the resistor value used while inHP3456a.MathMode.dbm
or the number of recalled readings in reading storage mode.
- property trigger_mode¶
Set the trigger mode.
Note that using
HP3456a.measure()
will override thetrigger_mode
toHP3456a.TriggerMode.single
.- Type:
- property upper¶
Get/set the value in
HP3456a.Register.upper
, which indicates the highest value measurement made while inHP3456a.MathMode.statistic
, or the highest value preset forHP3456a.MathMode.pass_fail
.
- property variance¶
Get the variance over
HP3456a.Register.count
measurements fromHP3456a.Register.variance
when inHP3456a.MathMode.statistic
.- Return type:
- property y¶
Get/set the value in
HP3456a.Register.y
to be used in calculations when inHP3456a.MathMode.scale
orHP3456a.MathMode.percent
.
- property z¶
Get/set the value in
HP3456a.Register.z
to be used in calculations when inHP3456a.MathMode.scale
or the first reading when inHP3456a.MathMode.statistic
.
HP6624a
Power Supply¶
- class instruments.hp.HP6624a(filelike)[source]¶
The HP6624a is a multi-output power supply.
This class can also be used for HP662xa, where x=1,2,3,4,7. Note that some models have less channels then the HP6624 and it is up to the user to take this into account. This can be changed with the
channel_count
property.Example usage:
>>> import instruments as ik >>> psu = ik.hp.HP6624a.open_gpibusb('/dev/ttyUSB0', 1) >>> psu.channel[0].voltage = 10 # Sets channel 1 voltage to 10V.
- class Channel(hp, idx)[source]¶
Class representing a power output channel on the HP6624a.
Warning
This class should NOT be manually created by the user. It is designed to be initialized by the
HP6624a
class.- query(cmd)[source]¶
Function used to send a command to the instrument while wrapping the command with the neccessary identifier for the channel.
- sendcmd(cmd)[source]¶
Function used to send a command to the instrument while wrapping the command with the neccessary identifier for the channel.
- Parameters:
cmd (str) – Command that will be sent to the instrument after being prefixed with the channel identifier
- property current¶
Gets/sets the current of the specified channel. If the device is in constant voltage mode, this sets the current limit.
Note there is no bounds checking on the value specified.
- property current_sense¶
Gets the actual output current as measured by the instrument for the specified channel.
- Units:
\(\text{A}\) (amps)
- Return type:
- property mode¶
Gets/sets the mode for the specified channel.
- property output¶
Gets/sets the outputting status of the specified channel.
This is a toggle setting. True will turn on the channel output while False will turn it off.
- Type:
- property overcurrent¶
Gets/sets the overcurrent protection setting for the specified channel.
This is a toggle setting. It is either on or off.
- Type:
- property overvoltage¶
Gets/sets the overvoltage protection setting for the specified channel.
Note there is no bounds checking on the value specified.
- property voltage¶
Gets/sets the voltage of the specified channel. If the device is in constant current mode, this sets the voltage limit.
Note there is no bounds checking on the value specified.
- class Mode(value)[source]¶
Enum holding typical valid output modes for a power supply.
However, for the HP6624a I believe that it is only capable of constant-voltage output, so this class current does not do anything and is just a placeholder.
- current = 0¶
- voltage = 0¶
- clear()[source]¶
Taken from the manual:
Return the power supply to its power-on state and all parameters are returned to their initial power-on values except the following:
The store/recall registers are not cleared.
The power supply remains addressed to listen.
The PON bit in the serial poll register is cleared.
- property channel¶
Gets a specific channel object. The desired channel is specified like one would access a list.
- Return type:
See also
HP6624a
for example using this property.
- property channel_count¶
Gets/sets the number of output channels available for the connected power supply.
- Type:
- property current¶
Gets/sets the current for all four channels.
- Units:
As specified (if a
Quantity
) or assumed to be of units Amps.- Type:
tuple`[`~pint.Quantity
, …] with units Amp
- property current_sense¶
Gets the actual current as measured by the instrument for all channels.
- Units:
\(\text{A}\) (amps)
- Return type:
tuple`[`~pint.Quantity
, …]
- property voltage¶
Gets/sets the voltage for all four channels.
- Units:
As specified (if a
Quantity
) or assumed to be of units Volts.- Type:
tuple`[`~pint.Quantity
, …] with units Volt
- property voltage_sense¶
Gets the actual voltage as measured by the sense wires for all channels.
- Units:
\(\text{V}\) (volts)
- Return type:
tuple`[`~pint.Quantity
, …]
HP6632b
Power Supply¶
- class instruments.hp.HP6632b(filelike, *args, **kwargs)[source]¶
The HP6632b is a system dc power supply with an output rating of 0-20V/0-5A, precision low current measurement and low output noise.
According to the manual this class MIGHT be usable for any HP power supply with a model number
HP663Xb with X in {1, 2, 3, 4},
HP661Xc with X in {1,2, 3, 4} and
HP663X2A for X in {1, 3}, without the additional measurement capabilities.
HOWEVER, it has only been tested by the author with HP6632b supplies.
Example usage:
>>> import instruments as ik >>> psu = ik.hp.HP6632b.open_gpibusb('/dev/ttyUSB0', 6) >>> psu.voltage = 10 # Sets voltage to 10V. >>> psu.output = True # Enable output >>> psu.voltage array(10.0) * V >>> psu.voltage_trigger = 20 # Set transient trigger voltage >>> psu.init_output_trigger() # Prime instrument to initiated state, ready for trigger >>> psu.trigger() # Send trigger >>> psu.voltage array(10.0) * V
- class ALCBandwidth(value)[source]¶
Enum containing valid ALC bandwidth modes for the hp6632b
- fast = 60000¶
- normal = 15000¶
- class DFISource(value)[source]¶
Enum containing valid DFI sources for the hp6632b
- event_status_bit = 'ESB'¶
- off = 'OFF'¶
- operation = 'OPER'¶
- questionable = 'QUES'¶
- request_service_bit = 'RQS'¶
- class DigitalFunction(value)[source]¶
Enum containing valid digital function modes for the hp6632b
- data = 'DIG'¶
- remote_inhibit = 'RIDF'¶
- class ErrorCodes(value)[source]¶
Enum containing generic-SCPI error codes along with codes specific to the HP6632b.
- block_data_error = -160¶
- block_data_not_allowed = -168¶
- cal_not_enabled = 403¶
- cal_password_incorrect = 402¶
- cal_switch_prevents_cal = 401¶
- character_data_error = -140¶
- character_data_not_allowed = -148¶
- character_data_too_long = -144¶
- command_error = -100¶
- command_header_error = -110¶
- command_only_applic_rs232 = 602¶
- computed_prog_cal_constants_incorrect = 405¶
- computed_readback_cal_const_incorrect = 404¶
- curr_or_volt_fetch_incompat_with_last_acq = 603¶
- cv_or_cc_status_incorrect = 407¶
- data_out_of_range = -222¶
- data_type_error = -104¶
- digital_io_selftest = 80¶
- execution_error = -200¶
- exponent_too_large = -123¶
- expression_error = -170¶
- expression_not_allowed = -178¶
- front_panel_uart_buffer_overrun = 223¶
- front_panel_uart_framing = 221¶
- front_panel_uart_overrun = 220¶
- front_panel_uart_parity = 222¶
- front_panel_uart_timeout = 224¶
- get_not_allowed = -105¶
- header_separator_error = -111¶
- header_suffix_out_of_range = -114¶
- illegal_macro_label = -273¶
- illegal_parameter_value = -224¶
- incorrect_seq_cal_commands = 406¶
- ingrd_recv_buffer_overrun = 213¶
- invalid_block_data = -161¶
- invalid_character = -101¶
- invalid_character_data = -141¶
- invalid_character_in_number = -121¶
- invalid_expression = -171¶
- invalid_inside_macro_definition = -183¶
- invalid_outside_macro_definition = -181¶
- invalid_separator = -103¶
- invalid_string_data = -151¶
- invalid_suffix = -131¶
- macro_error_180 = -180¶
- macro_error_270 = -270¶
- macro_execution_error = -272¶
- macro_parameter_error = -184¶
- macro_recursion_error = -276¶
- macro_redefinition_not_allowed = -277¶
- measurement_overrange = 604¶
- missing_parameter = -109¶
- no_error = 0¶
- numeric_data_error = -120¶
- numeric_data_not_allowed = -128¶
- operation_complete = -800¶
- out_of_memory = -225¶
- output_mode_must_be_normal = 408¶
- ovdac_selftest = 15¶
- parameter_not_allowed = -108¶
- power_on = -500¶
Raised when the instrument detects that it has been turned from off to on.
- program_mnemonic_too_long = -112¶
- query_deadlocked = -430¶
- query_error = -400¶
- query_interrupted = -410¶
- query_unterminated = -420¶
- query_unterminated_after_indefinite_response = -440¶
- ram_cal_checksum_failed = 3¶
- ram_config_checksum_failed = 2¶
- ram_rd0_checksum_failed = 1¶
- ram_rst_checksum_failed = 5¶
- ram_selftest = 10¶
- ram_state_checksum_failed = 4¶
- request_control_event = -700¶
- rs232_recv_framing_error = 216¶
- rs232_recv_overrun_error = 218¶
- rs232_recv_parity_error = 217¶
- string_data_error = -150¶
- string_data_not_allowed = -158¶
- suffix_error = -130¶
- suffix_not_allowed = -138¶
- suffix_too_long = -134¶
- syntax_error = -102¶
- system_error = -310¶
- too_many_digits = -124¶
- too_many_errors = -350¶
- too_many_sweep_points = 601¶
- too_much_data = -223¶
- undefined_header = -113¶
- unexpected_number_of_parameters = -115¶
- user_request_event = -600¶
- vdac_idac_selftest1 = 11¶
- vdac_idac_selftest2 = 12¶
- vdac_idac_selftest3 = 13¶
- vdac_idac_selftest4 = 14¶
- class RemoteInhibit(value)[source]¶
Enum containing vlaid remote inhibit modes for the hp6632b.
- latching = 'LATC'¶
- live = 'LIVE'¶
- off = 'OFF'¶
- class SenseWindow(value)[source]¶
Enum containing valid sense window modes for the hp6632b.
- hanning = 'HANN'¶
- rectangular = 'RECT'¶
- check_error_queue()[source]¶
Checks and clears the error queue for this device, returning a list of
ErrorCodes
orint
elements for each error reported by the connected instrument.
- init_output_trigger()[source]¶
Set the output trigger system to the initiated state. In this state, the power supply will respond to the next output trigger command.
- property current_sense_range¶
Get/set the sense current range by the current max value.
A current of 20mA or less selects the low-current range, a current value higher than that selects the high-current range. The low current range increases the low current measurement sensitivity and accuracy.
- property current_trigger¶
Gets/sets the pending triggered output current.
Note there is no bounds checking on the value specified.
- property digital_data¶
Get/set digital in+out port to data. Data can be an integer from 0-7.
- Type:
- property digital_function¶
Get/set the inhibit+fault port to digital in+out or vice-versa.
- Type:
- property display_brightness¶
Brightness of the display on the connected instrument, represented as a float ranging from 0 (dark) to 1 (full brightness).
- Type:
- property display_contrast¶
Contrast of the display on the connected instrument, represented as a float ranging from 0 (no contrast) to 1 (full contrast).
- Type:
- property init_output_continuous¶
Get/set the continuous output trigger. In this state, the power supply will remain in the initiated state, and respond continuously on new incoming triggers by applying the set voltage and current trigger levels.
- Type:
- property line_frequency¶
Gets/sets the power line frequency setting for the instrument.
- Returns:
The power line frequency
- Units:
Hertz
- Type:
- property output_dfi¶
Get/set the discrete fault indicator (DFI) output from the dc source. The DFI is an open-collector logic signal connected to the read panel FLT connection, that can be used to signal external devices when a fault is detected.
- Type:
- property output_dfi_source¶
Get/set the source for discrete fault indicator (DFI) events.
- Type:
- property output_protection_delay¶
Get/set the time between programming of an output change that produces a constant current condition and the recording of that condigition in the Operation Status Condition register. This command also delays over current protection, but not overvoltage protection.
- property output_remote_inhibit¶
Get/set the remote inhibit signal. Remote inhibit is an external, chassis-referenced logic signal routed through the rear panel INH connection, which allows an external device to signal a fault.
- Type:
- property sense_sweep_interval¶
Get/set the digitizer sample spacing. Can be set from 15.6 us to 31200 seconds, the interval will be rounded to the nearest 15.6 us increment.
- property sense_window¶
Get/set the measurement window function.
- Type:
- property voltage_alc_bandwidth¶
Get the “automatic level control bandwidth” which for the HP66332A and HP6631-6634 determines if the output capacitor is in circuit.
Normal
denotes that it is, andFast
denotes that it is not.- Type:
HP6652a
Single Output Power Supply¶
- class instruments.hp.HP6652a(filelike, *args, **kwargs)[source]¶
The HP6652a is a single output power supply.
Because it is a single channel output, this object inherits from both PowerSupply and PowerSupply.Channel.
According to the manual, this class MIGHT be usable for any HP power supply with a model number HP66XYA, where X is in {4,5,7,8,9} and Y is a digit(?). (e.g. HP6652A and HP6671A)
HOWEVER, it has only been tested by the author with an HP6652A power supply.
Example usage:
>>> import time >>> import instruments as ik >>> psu = ik.hp.HP6652a.open_serial('/dev/ttyUSB0', 57600) >>> psu.voltage = 3 # Sets output voltage to 3V. >>> psu.output = True >>> psu.voltage array(3.0) * V >>> psu.voltage_sense < 5 True >>> psu.output = False >>> psu.voltage_sense < 1 True >>> psu.display_textmode=True >>> psu.display_text("test GOOD") 'TEST GOOD' >>> time.sleep(5) >>> psu.display_textmode=False
- display_text(text_to_display)[source]¶
Sends up to 12 (uppercase) alphanumerics to be sent to the front-panel LCD display. Some punctuation is allowed, and can affect the number of characters allowed. See the programming manual for the HP6652A for more details.
Because the maximum valid number of possible characters is 15 (counting the possible use of punctuation), the text will be truncated to 15 characters before the command is sent to the instrument.
If an invalid string is sent, the command will fail silently. Any lowercase letters in the text_to_display will be converted to uppercase before the command is sent to the instrument.
No attempt to validate punctuation is currently made.
Because the string cannot be read back from the instrument, this method returns the actual string value sent.
- Parameters:
text_to_display ('str') – The text that you wish to have displayed on the front-panel LCD
- Returns:
Returns the version of the provided string that will be send to the instrument. This means it will be truncated to a maximum of 15 characters and changed to all upper case.
- Return type:
- property channel¶
Return the channel (which in this case is the entire instrument, since there is only 1 channel on the HP6652a.)
- Return type:
‘tuple’ of length 1 containing a reference back to the parent HP6652a object.
- property current¶
Gets/sets the output current.
Note there is no bounds checking on the value specified.
- property current_sense¶
Gets the actual output current as measured by the sense wires.
- Units:
\(\text{A}\) (amps)
- Return type:
- property display_textmode¶
Gets/sets the display mode.
This is a toggle setting. True will allow text to be sent to the front-panel LCD with the display_text() method. False returns to the normal display mode.
See also
- Type:
- property mode¶
Unimplemented.
- property name¶
The name of the connected instrument, as reported by the standard SCPI command
*IDN?
.- Return type:
- property output¶
Gets/sets the output status.
This is a toggle setting. True will turn on the instrument output while False will turn it off.
- Type:
- property overcurrent¶
Gets/sets the overcurrent protection setting.
This is a toggle setting. It is either on or off.
- Type:
- property overvoltage¶
Gets/sets the overvoltage protection setting in volts.
Note there is no bounds checking on the value specified.
- property voltage¶
Gets/sets the output voltage.
Note there is no bounds checking on the value specified.
HPe3631a
Power Supply¶
- class instruments.hp.HPe3631a(filelike)[source]¶
The HPe3631a is a three channels voltage/current supply. - Channel 1 is a positive +6V/5A channel (P6V) - Channel 2 is a positive +25V/1A channel (P25V) - Channel 3 is a negative -25V/1A channel (N25V)
This module is designed for the power supply to be set to a specific channel and remain set afterwards as this device does not offer commands to set or read multiple channels without calling the channel set command each time (0.5s). It is possible to call a specific channel through psu.channel[idx], which will automatically reset the channel id, when necessary.
This module is likely to work as is for the Agilent E3631 and Keysight E3631 which seem to be rebranded but identical devices.
Example usage:
>>> import instruments as ik >>> psu = ik.hp.HPe3631a.open_gpibusb("/dev/ttyUSB0", 10) >>> psu.channelid = 2 # Sets channel to P25V >>> psu.voltage = 12.5 # Sets voltage to 12.5V >>> psu.voltage # Reads back set voltage array(12.5) * V >>> psu.voltage_sense # Reads back sensed voltage array(12.501) * V
- class Channel(parent, valid_set)[source]¶
Class representing a power output channel on the HPe3631a.
Warning
This class should NOT be manually created by the user. It is designed to be initialized by the
HPe3631a
class.
- property channel¶
Gets a specific channel object. The desired channel is specified like one would access a list.
- Return type:
See also
HPe3631a
for example using this property.
- property channelid¶
Gets/Sets the active channel ID.
- Type:
HPe3631a.ChannelType
- property current¶
Gets/sets the output current of the source.
- property current_max¶
- property current_min¶
- property current_sense¶
Gets the actual output current as measured by the sense wires.
- Units:
As specified, or assumed to be \(\text{A}\) otherwise.
- Type:
- property mode¶
Gets/sets the mode for the specified channel.
The constant-voltage/constant-current modes of the power supply are selected automatically depending on the load (resistance) connected to the power supply. If the load greater than the set V/I is connected, a voltage V is applied and the current flowing is lower than I. If the load is smaller than V/I, the set current I acts as a current limiter and the voltage is lower than V.
- property output¶
Gets/sets the outputting status of the specified channel.
This is a toggle setting. ON will turn on the channel output while OFF will turn it off.
- Type:
- property voltage¶
Gets/sets the output voltage of the source.
- property voltage_max¶
Gets the maximum voltage for the current channel.
- Units:
\(\text{V}\).
- Type:
- property voltage_min¶
Gets the minimum voltage for the current channel.
- Units:
\(\text{V}\).
- Type:
- property voltage_range¶
Gets the voltage range for the current channel.
The MAX function SCPI command is designed in such a way on this device that it always returns the largest absolute value. There is no need to query MIN, as it is always 0., but one has to order the values as MAX can be negative.
- Units:
\(\text{V}\).
- Type:
array of
Quantity