Read Serial-Nr. and checks the limits of the device

20240709SerdarModScript.py

@@ -351,11 +351,10 @@ def write_no_echo(instr:pyvisa.resources.Resource, command:str, sleeptime=0.01)-
     except pyvisa.VisaIOError as e:
         print(f"Error communicating with instrument: {e}")
 
-# TODO: implement the reverse scan and zero when finish functionality 
 # receive values in units of T, rescale in kg to talk with the power supplyy. 1T = 10kG
 def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float, 
                 res:float, Settings:str, base_file_name='', path_save="C:/Users/localadmin/Desktop/Users/Lukas/2024_02_08_Map_test",
-                singlepowersupply_bool=False, reversescan_bool=False, zerowhenfin_bool=False)->None:
+                reversescan_bool=False, zerowhenfin_bool=False)->None:
     """ this function performs a sweep of the B field of the chosen magnet coil. It creates a list o B values from the given min and max values, with the given resolution. For each value, a measurement of the spectrum
     of the probe in the cryostat is made, using the LightField spectrometer.
 
@@ -375,26 +374,44 @@ def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float,
         ValueError: when By limit is exceeded.
         ValueError: when Bz limit is exceeded.
         ValueError: when Bx limit is exceeded.
+        ConnectionError: when no device is connected.
     """    ''''''
     if base_file_name =='':
         base_file_name = datetime.datetime.now().strftime('%Y_%m_%d_%H.%M')
 
-    start_time = time.time()
+    start_time = time.time()  # start of the scan function
+
+    # TODO: queries the serial number of the device, and from there, check the if the input limits exceed the recommended limits
+    instr_info = query_no_echo(instr, '*IDN?')
+
     instr_bsettings = list(sep_num_from_units(el) for el in query_no_echo(instr, 'UNITS?;LLIM?;ULIM?').split(';'))  # deliver a 3 element tuple of tuples containing the set unit, llim and ulim 
 
     if instr_bsettings[0][0] == 'T':
         instr_bsettings[1][0] = instr_bsettings[1][0]*0.1  # rescale kG to T, device accepts values only in kG or A, eventho we set it to T
         instr_bsettings[2][0] = instr_bsettings[2][0]*0.1
 
-    if singlepowersupply_bool:  # checks limits of Bx or By
+    # if singlepowersupply_bool:  # checks limits of Bx or By
+    #     if (min_bval< -BY_MAX) or (max_bval > BY_MAX):
+    #         raise ValueError('Input limits exceed that of the magnet By! Please input smaller limits.')
+    # elif '1' in query_no_echo(instr, 'CHAN?'):  # check if its the coils for Bz
+    #     if (min_bval < -BZ_MAX) or (max_bval > BZ_MAX):
+    #         raise ValueError('Input limits exceed that of the magnet (Bz)! Please input smaller limits.')
+    # else:  # checks limits of Bx
+    #     if (min_bval< -BX_MAX) or (max_bval > BX_MAX):
+    #         raise ValueError('Input limits exceed that of the magnet Bx! Please input smaller limits.')
+ 
+    if '2101014' in instr_info:  # single power supply
         if (min_bval< -BY_MAX) or (max_bval > BY_MAX):
             raise ValueError('Input limits exceed that of the magnet By! Please input smaller limits.')
-    elif '1' in query_no_echo(instr, 'CHAN?'):  # check if its the coils for Bz
+    elif '2301034' in instr_info:  # dual power supply
-        if (min_bval < -BZ_MAX) or (max_bval > BZ_MAX):
+        if '1' in query_no_echo(instr, 'CHAN?'):  # check if its the coils for Bz
-            raise ValueError('Input limits exceed that of the magnet (Bz)! Please input smaller limits.')
+            if (min_bval < -BZ_MAX) or (max_bval > BZ_MAX):
-    else:  # checks limits of Bx
+                raise ValueError('Input limits exceed that of the magnet (Bz)! Please input smaller limits.')
-        if (min_bval< -BX_MAX) or (max_bval > BX_MAX):
+        else:  # checks limits of Bx
-            raise ValueError('Input limits exceed that of the magnet Bx! Please input smaller limits.')
+            if (min_bval< -BX_MAX) or (max_bval > BX_MAX):
+                raise ValueError('Input limits exceed that of the magnet Bx! Please input smaller limits.')
+    else:
+        raise ConnectionError('Device is not connected!')
 
     write_no_echo(instr, f'LLIM {min_bval*10};ULIM {max_bval*10}')  # sets the given limits, must convert to kG for the device to read
     bval_lst = np.arange(min_bval, max_bval + res, res)  # creates list of B values to measure at, with given resolution, in T
@@ -476,6 +493,8 @@ def sweep_b_val(instr:pyvisa.resources.Resource, min_bval:float, max_bval:float,
     elapsed_time = (end_time - start_time) / 60
     print('Scan time: ', elapsed_time, 'minutes')
 
+    write_no_echo(instr, f'LLIM {instr_bsettings[1][0]*10};ULIM {instr_bsettings[2][0]*10}')  # reset the initial limits of the device after the scan
+
     if zerowhenfin_bool:
         write_no_echo(instr, 'SWEEP ZERO')  # if switched on, discharges the magnet after performing the measurement loop above
     
@@ -560,11 +579,10 @@ experiment_name = f"{set_llim_bval}T_to_{set_ulim_bval}T_{set_res_bval}T_{dateti
 # perform the B-field measurement for selected axis above
 # sweep_b_val(powerbox_dualsupply, set_llim_bval, set_ulim_bval, set_res_bval, experiment_settings, experiment_name)
 sweep_b_val(powerbox_dualsupply, set_llim_bval, set_ulim_bval, set_res_bval, 
-            experiment_settings, experiment_name, singlepowersupply_bool=False, zerowhenfin_bool=True, reversescan_bool=False)
+            experiment_settings, experiment_name, zerowhenfin_bool=True, reversescan_bool=False)
 
 # Internally, axes are numbered 0 to 2
 
 write_no_echo(powerbox_dualsupply, 'LOCAL')  # turn off the remote mode
 # time.sleep(0.5)
 powerbox_dualsupply.close()
-