added new functions to access dI and dV

1 files changed, 23 insertions, 1 deletions

diff --git a/qolab/hardware/power_supply/keysight_e3612a.py b/qolab/hardware/power_supply/keysight_e3612a.py
index fc13bc0..168e7b3 100644
--- a/qolab/hardware/power_supply/keysight_e3612a.py
+++ b/qolab/hardware/power_supply/keysight_e3612a.py
@@ -10,7 +10,29 @@ class KeysightE3612A(PowerSupplySCPI):
         self.config['Device model'] = 'Keysight E3612A'
         self.numberOfChannels = 3
         self.deviceProperties = {'OpMode', };
-        self.channelProperties = {'IsOn', 'Regulation', 'Vout', 'Vlimit', 'Iout', 'Ilimit', }
+        self.channelProperties = {'IsOn', 'Regulation', 'Vout', 'Vlimit', 'Iout', 'Ilimit', 'dV', 'dI', }
+
+    def getChandV(self, chNum):
+        """
+        Voltage precision per channel.
+        Obtained from data sheet.
+        Alternative estimate is by assuming 14 bit precision from the maximum reading.
+        """
+        if chNum == 1:
+            return 0.24e-3
+        return 1.5e-3
+
+    def getChandI(self, chNum):
+        """
+        Current precision per channel.
+        Obtained from data sheet.
+        Alternative estimate is by assuming 14 bit precision from the maximum reading.
+        """
+        if chNum == 1:
+            return 0.2e-3
+        return 0.160e-3 # see specification for high current > 20mA
+
+
 
     def getOpMode(self):
         """