diff --git a/docs/changes/newsfragments/6076.improved_driver b/docs/changes/newsfragments/6076.improved_driver
new file mode 100644
index 00000000000..8a980a73d21
--- /dev/null
+++ b/docs/changes/newsfragments/6076.improved_driver
@@ -0,0 +1,3 @@
+- Fix the Harvard DecaDAC range not including the highest bit
+- Fix Keysight 34465A DMM firmware version parsing
+- Fix Oxford Instruments Triton section parsing
diff --git a/src/qcodes/instrument_drivers/Harvard/Decadac.py b/src/qcodes/instrument_drivers/Harvard/Decadac.py
index 1384fe0523e..2ae3bc9a801 100644
--- a/src/qcodes/instrument_drivers/Harvard/Decadac.py
+++ b/src/qcodes/instrument_drivers/Harvard/Decadac.py
@@ -42,14 +42,14 @@ def _dac_v_to_code(self, volt):
         based on the minimum/maximum values of a given channel.
         Midrange is 32768.
         """
-        if volt < self.min_val or volt >= self.max_val:
+        if volt < self.min_val or volt > self.max_val:
             raise ValueError(
                 f"Cannot convert voltage {volt} V to a voltage code, value out of range "
                 f"({self.min_val} V - {self.max_val} V)."
             )
 
         frac = (volt - self.min_val) / (self.max_val - self.min_val)
-        val = int(round(frac * 65536))
+        val = int(round(frac * 65535))
         # extra check to be absolutely sure that the instrument does nothing
         # receive an out-of-bounds value
         if val > 65535 or val < 0:
@@ -65,7 +65,7 @@ def _dac_code_to_v(self, code):
         based on the minimum/maximum values of a given channel.
         Midrange is 32768.
         """
-        frac = code/65536.0
+        frac = code / 65535.0
         return (frac * (self.max_val - self.min_val)) + self.min_val
 
     def _set_slot(self):
diff --git a/src/qcodes/instrument_drivers/Keysight/private/Keysight_344xxA_submodules.py b/src/qcodes/instrument_drivers/Keysight/private/Keysight_344xxA_submodules.py
index fca2ce19f89..1f026fc2c7f 100644
--- a/src/qcodes/instrument_drivers/Keysight/private/Keysight_344xxA_submodules.py
+++ b/src/qcodes/instrument_drivers/Keysight/private/Keysight_344xxA_submodules.py
@@ -657,7 +657,7 @@ def __init__(
             "DIG" in options
             or version.parse(convert_legacy_version_to_supported_version("A.03"))
             <= version.parse(
-                convert_legacy_version_to_supported_version(idn["firmware"])
+                convert_legacy_version_to_supported_version(idn["firmware"])[:11]
             )
         )
         # Note that the firmware version check is still needed because
diff --git a/src/qcodes/instrument_drivers/oxford/triton.py b/src/qcodes/instrument_drivers/oxford/triton.py
index c25c229aff8..08a3dda777a 100644
--- a/src/qcodes/instrument_drivers/oxford/triton.py
+++ b/src/qcodes/instrument_drivers/oxford/triton.py
@@ -482,7 +482,7 @@ def _get_temp_channel_names(self, file: str) -> None:
             options = config.options(section)
             namestr = '"m_lpszname"'
             if namestr in options:
-                chan_number = int(section.split("\\")[-1].split("[")[-1]) + 1
+                chan_number = int(re.findall(r"\d+", section)[-1]) + 1
                 # the names used in the register file are base 0 but the api and the gui
                 # uses base one names so add one
                 chan = "T" + str(chan_number)