diff options
| -rw-r--r-- | qolab/hardware/multimeter/hp3457a.py | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/qolab/hardware/multimeter/hp3457a.py b/qolab/hardware/multimeter/hp3457a.py index 226d1e2..51914bd 100644 --- a/qolab/hardware/multimeter/hp3457a.py +++ b/qolab/hardware/multimeter/hp3457a.py @@ -14,6 +14,7 @@ from qolab.hardware.basic import BasicInstrument from ._basic import Multimeter import pyvisa +import numpy as np class HP3457A(Multimeter): """ @@ -46,6 +47,9 @@ class HP3457A(Multimeter): 'PER'#(This is here for future work) ] + # Allowed number of power line cycles (defines A/D integration time) + NPLC = [0.0005, 0.005, .1, 1, 10, 100] + # DC Volts Spec (This is here for future work) DCV_RES = {'30mv': {'6.5': 10e-9, '5.5': 100e-9, '4.5': 1e-6, '3.5': 10e-6}, '300mv': {'6.5': 100e-9, '5.5': 1e-6, '4.5': 10e-6, '3.5': 100e-6}, @@ -114,10 +118,10 @@ class HP3457A(Multimeter): self.read = self.resource.read self.write = self.resource.write self.read_bytes = self.resource.read_bytes - self.query = self.resource.query self.switchTime = 0.5 # switch time in seconds for Function/Measurement change self.deviceProperties.update({"Function"}) + self.set_function('DCV') def get_idn(self): @@ -148,13 +152,15 @@ class HP3457A(Multimeter): print(f'[ERROR!] Couldn\'t set reading format to {format}: {e}') else: print(f'[WARNING] Entered format is not allowed. Allowed formats: {self.FORMATS}') - + + @BasicInstrument.tsdb_append def get_reading(self): try: self.write(f'TARM AUTO') return float(self.read_bytes(16).decode().strip()) except pyvisa.VisaIOError as e: print(f'[ERROR!] Error failed to get reading: {e}') + return np.nan() def set_beeper_status(self, status='OFF'): if status in self.BEEPER_STATUS: @@ -183,6 +189,7 @@ class HP3457A(Multimeter): print(f"[WARNING!] Invalid measurement function '{function}'. " f"Valid functions are: {', '.join(self.FUNCTIONS)}") + @BasicInstrument.tsdb_append def get_temperature(self): try: self.write("TEMP?") @@ -192,6 +199,17 @@ class HP3457A(Multimeter): except pyvisa.VisaIOError as e: print(f"[ERROR!] Error retrieving DMM's internal temperature: {e}") + def get_memory_count(self): + """ + Returns the total number of stored readings. + """ + try: + self.write(f'MCOUNT?') + return float(self.read_bytes(16).decode().strip()) + except pyvisa.VisaIOError as e: + print(f'[ERROR!] Error failed to get count of reading in memory: {e}') + return np.nan() + def enable_keyboard(self, status=True): if status: try: @@ -206,7 +224,18 @@ class HP3457A(Multimeter): except pyvisa.VisaIOError as e: print(f"[ERROR!] Error locking the DMM's keyboard: {e}") + def set_nplc(self, nplc=10): + if nplc in self.NPLC: + try: + self.write(f"FUNC {nplc}") + print(f"[INFO] NPLC is set to {nplc}") + except pyvisa.VisaIOError as e: + print(f"[ERROR!] Error setting number of power line cycles (NPLC): {e}") + else: + print(f"[WARNING!] Invalid NPLC '{nplc}'. " + f"Valid NPLC values are: {', '.join(str(self.NPLC))}") + #----------------------------------------------------------- # Methods to comply with other DMM QOLab module drivers #----------------------------------------------------------- |