class K2750(object):
def __init__(self, port='/dev/ttyUSB0', clr=True, ident=True):
self.gpib = PUGpib(port=port,
addr=16,
clr=clr,
eos=3,
ser_timeout=1.0,
gpib_timeout=0.9)
self.func = None
self.vendor = None
self.model = None
self.sn = None
if ident:
vendor, model = self.ident()
if (vendor, model) != ('KEITHLEY INSTRUMENTS INC.', 'MODEL 2750'):
raise ValueError('Bad instrument: %s, %s' % (vendor, model))
def ident(self):
# just vendor, model
return self.ident_ex()[0:2]
def ident_ex(self):
'''
Returns the manufacturer, model number, serial
number, and firmware revision levels of the
unit.
['KEITHLEY INSTRUMENTS INC.', 'MODEL 2750', '0967413', 'A07 /A01']
'''
ret = self.gpib.sendrecv_str("*IDN?").split(',')
self.vendor = ret[0]
self.model = ret[1]
sn = ret[2]
fw = ret[3]
return (self.vendor, self.model, sn, fw)
def card_sn(self):
return self.gpib.sendrecv_str("SYSTem:CARD1:SNUMber?")
def tim_int(self):
'''Query timer interval'''
return float(self.gpib.snd_rcv('TRIGger:TIMer?'))
def local(self):
'''Go to local mode'''
# Error -113
self.gpib.snd('GTL')
def set_beep(self, en):
'''
You can disable the beeper for limits and continuity tests. However, when limits or CONT
is again selected, the beeper will automatically enable.
'''
if en:
self.gpib.snd("SYSTEM:BEEPER OFF")
else:
self.gpib.snd("SYSTEM:BEEPER ON")
def error(self):
'''Get next error from queue'''
return self.gpib.snd_rcv("SYSTEM:ERROR?")
def errors(self):
ret = []
while True:
e = self.error()
if e == '0,"No error"':
return ret
ret.append(e)
def volt_dc_ex(self):
if self.func != 'VOLT:DC':
self.gpib.snd(":FUNC 'VOLT:DC'")
time.sleep(0.20)
self.func = 'VOLT:DC'
raw = self.gpib.snd_rcv(":DATA?")
m = volt_dc_re.match(raw)
if not m:
raise Exception("Bad reading: %s" % (raw, ))
vdc = float(m.group(1))
secs = float(m.group(2))
rdng = float(m.group(3))
return {"VDC": vdc, "SECS": secs, "RDNG#": rdng}
def volt_dc(self):
return self.volt_dc_ex()["VDC"]
def curr_dc_ex(self):
if self.func != 'CURR:DC':
self.gpib.snd(":FUNC 'CURR:DC'")
# Seems to take at least 0.1 sec
# had problems with 0.15
time.sleep(0.20)
self.func = 'CURR:DC'
raw = self.gpib.snd_rcv(":DATA?")
m = curr_dc_re.match(raw)
if not m:
raise Exception("Bad reading: %s" % (raw, ))
adc = float(m.group(1))
secs = float(m.group(2))
rdngn = float(m.group(3))
return {"ADC": adc, "SECS": secs, "RDNG#": rdngn}
def curr_dc(self):
return self.curr_dc_ex()["ADC"]
def res_ex(self):
if self.func != 'RES':
self.gpib.snd(":FUNC 'RES'")
# Seems to take at least 0.1 sec
# had problems with 0.15
time.sleep(0.20)
self.func = 'RES'
raw = self.gpib.snd_rcv(":DATA?")
m = res_re.match(raw)
if not m:
raise Exception("Bad reading: %s" % (raw, ))
adc = m.group(1)
if adc.find('OHM') >= 0:
adc = float(adc.replace('OHM', ''))
else:
adc = float('inf')
secs = float(m.group(2))
rdngn = float(m.group(3))
return {"ADC": adc, "SECS": secs, "RDNG#": rdngn}
def res(self):
return self.res_ex()["ADC"]
class K2750(object):
def __init__(self, port='/dev/ttyUSB0', clr=True, ident=True):
self.gpib = PUGpib(port=port, addr=16, clr=clr, eos=3, ser_timeout=1.0, gpib_timeout=0.9)
self.func = None
self.vendor = None
self.model = None
self.sn = None
if ident:
vendor, model = self.ident()
if (vendor, model) != ('KEITHLEY INSTRUMENTS INC.', 'MODEL 2750'):
raise ValueError('Bad instrument: %s, %s' % (vendor, model))
def ident(self):
# just vendor, model
return self.ident_ex()[0:2]
def ident_ex(self):
'''
Returns the manufacturer, model number, serial
number, and firmware revision levels of the
unit.
['KEITHLEY INSTRUMENTS INC.', 'MODEL 2750', '0967413', 'A07 /A01']
'''
ret = self.gpib.sendrecv_str("*IDN?").split(',')
self.vendor = ret[0]
self.model = ret[1]
sn = ret[2]
fw = ret[3]
return (self.vendor, self.model, sn, fw)
def card_sn(self):
return self.gpib.sendrecv_str("SYSTem:CARD1:SNUMber?")
def tim_int(self):
'''Query timer interval'''
return float(self.gpib.snd_rcv('TRIGger:TIMer?'))
def local(self):
'''Go to local mode'''
# Error -113
self.gpib.snd('GTL')
def set_beep(self, en):
'''
You can disable the beeper for limits and continuity tests. However, when limits or CONT
is again selected, the beeper will automatically enable.
'''
if en:
self.gpib.snd("SYSTEM:BEEPER OFF")
else:
self.gpib.snd("SYSTEM:BEEPER ON")
def error(self):
'''Get next error from queue'''
return self.gpib.snd_rcv("SYSTEM:ERROR?")
def errors(self):
ret = []
while True:
e = self.error()
if e == '0,"No error"':
return ret
ret.append(e)
def volt_dc_ex(self):
if self.func != 'VOLT:DC':
self.gpib.snd(":FUNC 'VOLT:DC'")
time.sleep(0.20)
self.func = 'VOLT:DC'
raw = self.gpib.snd_rcv(":DATA?")
m = volt_dc_re.match(raw)
if not m:
raise Exception("Bad reading: %s" % (raw,))
vdc = float(m.group(1))
secs = float(m.group(2))
rdng = float(m.group(3))
return {"VDC": vdc, "SECS": secs, "RDNG#": rdng}
def volt_dc(self):
return self.volt_dc_ex()["VDC"]
def curr_dc_ex(self):
if self.func != 'CURR:DC':
self.gpib.snd(":FUNC 'CURR:DC'")
# Seems to take at least 0.1 sec
# had problems with 0.15
time.sleep(0.20)
self.func = 'CURR:DC'
raw = self.gpib.snd_rcv(":DATA?")
m = curr_dc_re.match(raw)
if not m:
raise Exception("Bad reading: %s" % (raw,))
adc = float(m.group(1))
secs = float(m.group(2))
rdngn = float(m.group(3))
return {"ADC": adc, "SECS": secs, "RDNG#": rdngn}
def curr_dc(self):
return self.curr_dc_ex()["ADC"]
def res_ex(self):
if self.func != 'RES':
self.gpib.snd(":FUNC 'RES'")
# Seems to take at least 0.1 sec
# had problems with 0.15
time.sleep(0.20)
self.func = 'RES'
raw = self.gpib.snd_rcv(":DATA?")
m = res_re.match(raw)
if not m:
raise Exception("Bad reading: %s" % (raw,))
adc = m.group(1)
if adc.find('OHM') >= 0:
adc = float(adc.replace('OHM', ''))
else:
adc = float('inf')
secs = float(m.group(2))
rdngn = float(m.group(3))
return {"ADC": adc, "SECS": secs, "RDNG#": rdngn}
def res(self):
return self.res_ex()["ADC"]
