# -*- coding: utf-8 -*-
"""
this is a small demo program to control an HP/Agilent/Keysight E3634A that performs the following:
 * Identify Instrument
 * set output voltage and current
 * enable output
 * readback current output voltage and current
 * disable output
 * read Instrument Errors
 
"""

import pyvisa as visa
import time

rm = visa.ResourceManager()
psu=rm.open_resource('USB0::1003::8293::HEWLETT-PACKARD_E3634A_0_1.6-5.0-1.0::0::INSTR')

print(psu.query('*IDN?'))

psu.write('VOLT 5.0')
psu.write('CURR 0.3')
psu.write('OUTP ON')

time.sleep(3)
v_meas=psu.query('MEAS:VOLT?')
i_meas=psu.query('MEAS:CURR?')
print(f'V={v_meas.strip()}   I={i_meas.strip()}')

psu.write('OUTP OFF')

inst_error=''
while inst_error.strip() != '+0,"No error"':
    inst_error=psu.query('SYST:ERR?')
    print(inst_error)
    
psu.close()
rm.close()