diff --git a/piel/experimental/models/__init__.py b/piel/experimental/models/__init__.py
index 5b40b071..8c87df08 100644
--- a/piel/experimental/models/__init__.py
+++ b/piel/experimental/models/__init__.py
@@ -1,4 +1,4 @@
-from .cables import rg164
+from .cables import rg164, generic_sma, generic_banana
 from .multimeter import DMM6500
 from .rf_passives import create_power_splitter_1to2
 from .rf_calibration import (
diff --git a/piel/experimental/models/cables.py b/piel/experimental/models/cables.py
index 9e6c5d24..ee9f9c53 100644
--- a/piel/experimental/models/cables.py
+++ b/piel/experimental/models/cables.py
@@ -1,14 +1,89 @@
-from ...types import CoaxialCable, CoaxialCableGeometryType
+from ...types import CoaxialCable, CoaxialCableGeometryType, PhysicalPort, DCCable
+
+
+def generic_banana(
+    name: str,
+    length_m: float,
+    **kwargs,
+) -> DCCable:
+    ports = [
+        PhysicalPort(
+            name="IN",
+            domain="DC",
+            connector="Male",
+        ),
+        PhysicalPort(
+            name="OUT",
+            domain="DC",
+            connector="Male",
+        )
+    ]
+
+    return DCCable(
+        name=name,
+        ports=ports,
+        **kwargs,
+    )
+
 
 
 def rg164(
     length_m: float,
+    **kwargs,
+) -> CoaxialCable:
+    geometry = CoaxialCableGeometryType(
+        length_m=length_m,
+    )
+
+    ports = [
+        PhysicalPort(
+            name="IN",
+            domain="RF",
+            connector="SMA",
+        ),
+        PhysicalPort(
+            name="OUT",
+            domain="RF",
+            connector="SMA",
+        )
+    ]
+
+    return CoaxialCable(
+        name="RG164",
+        geometry=geometry,
+        ports=ports,
+        **kwargs,
+    )
+
+
+def generic_sma(
+    name: str,
+    length_m: float,
+    **kwargs,
 ) -> CoaxialCable:
     geometry = CoaxialCableGeometryType(
         length_m=length_m,
     )
 
-    return CoaxialCable(name="RG164", geometry=geometry)
+    ports = [
+        PhysicalPort(
+            name="IN",
+            domain="RF",
+            connector="SMA",
+        ),
+        PhysicalPort(
+            name="OUT",
+            domain="RF",
+            connector="SMA",
+        )
+    ]
+
+    return CoaxialCable(
+        name=name,
+        geometry=geometry,
+        ports=ports,
+        **kwargs,
+    )
 
 
 def cryo_cable(
diff --git a/piel/experimental/models/sourcemeter.py b/piel/experimental/models/sourcemeter.py
index ab6d1221..e5005e9c 100644
--- a/piel/experimental/models/sourcemeter.py
+++ b/piel/experimental/models/sourcemeter.py
@@ -1,8 +1,14 @@
+from typing import Optional
 from ...types import PhysicalPort
 from ..types import Sourcemeter
 
 
-def SMU2450(**kwargs) -> Sourcemeter:
+def SMU2450(name: Optional[str] = None,
+            **kwargs) -> Sourcemeter:
+    
+    if name is None:
+        name = "SMU2450"
+
     ports = [
         PhysicalPort(
             name="FORCEHI",
@@ -31,4 +37,4 @@ def SMU2450(**kwargs) -> Sourcemeter:
         ),
     ]
 
-    return Sourcemeter(name="SMU2450", manufacturer="Keithley", ports=ports, **kwargs)
+    return Sourcemeter(name=name, manufacturer="Keithley", ports=ports, **kwargs)
diff --git a/piel/experimental/types/dc.py b/piel/experimental/types/dc.py
index 4b9d6208..78b697f9 100644
--- a/piel/experimental/types/dc.py
+++ b/piel/experimental/types/dc.py
@@ -1,3 +1,4 @@
+from typing import Optional
 from .device import Device, DeviceConfiguration
 
 
@@ -16,7 +17,7 @@ class Sourcemeter(Device):
     Represents a sourcemeter.
     """
 
-    configuration: SourcemeterConfiguration
+    configuration: Optional[SourcemeterConfiguration] = None
 
 
 class MultimeterConfiguration(DeviceConfiguration):
diff --git a/piel/types/electrical/cables.py b/piel/types/electrical/cables.py
index 4c7b0a58..adb72627 100644
--- a/piel/types/electrical/cables.py
+++ b/piel/types/electrical/cables.py
@@ -6,7 +6,7 @@
 
 # TODO This shouldn't be a quantity
 class CoaxialCableGeometryType(QuantityType):
-    core_cross_sectional_area_m2: Optional[float]
+    core_cross_sectional_area_m2: Optional[float] = None
     """
     The cross-sectional area of the core in meters squared.
     """
@@ -16,12 +16,12 @@ class CoaxialCableGeometryType(QuantityType):
     The length of the cable in meters.
     """
 
-    sheath_cross_sectional_area_m2: Optional[float]
+    sheath_cross_sectional_area_m2: Optional[float] = None
     """
     The cross-sectional area of the sheath in meters squared.
     """
 
-    total_cross_sectional_area_m2: Optional[float]
+    total_cross_sectional_area_m2: Optional[float] = None
     """
     The total cross-sectional area of the cable in meters squared.
     """
@@ -32,17 +32,17 @@ class CoaxialCableHeatTransferType(QuantityType):
     All units are in watts.
     """
 
-    core: Optional[float]
+    core: Optional[float] = None
     """
     The computed heat transfer in watts for the core of the cable.
     """
 
-    sheath: Optional[float]
+    sheath: Optional[float] = None
     """
     The computed heat transfer in watts for the sheath of the cable.
     """
 
-    dielectric: Optional[float]
+    dielectric: Optional[float] = None
     """
     The computed heat transfer in watts for the dielectric of the cable.
     """
@@ -56,17 +56,17 @@ class CoaxialCableHeatTransferType(QuantityType):
 
 
 class CoaxialCableMaterialSpecificationType(QuantityType):
-    core: Optional[MaterialReferenceType]
+    core: Optional[MaterialReferenceType] = None
     """
     The material of the core.
     """
 
-    sheath: Optional[MaterialReferenceType]
+    sheath: Optional[MaterialReferenceType] = None
     """
     The material of the sheath.
     """
 
-    dielectric: Optional[MaterialReferenceType]
+    dielectric: Optional[MaterialReferenceType] = None
     """
     The material of the dielectric.
     """
@@ -94,7 +94,7 @@ class DCCableHeatTransferType(QuantityType):
     All units are in watts.
     """
 
-    core: Optional[float]
+    core: Optional[float] = None
     """
     The computed heat transfer in watts for the core of the cable.
     """
@@ -108,7 +108,7 @@ class DCCableHeatTransferType(QuantityType):
 
 
 class DCCableMaterialSpecificationType(QuantityType):
-    core: Optional[MaterialReferenceType]
+    core: Optional[MaterialReferenceType] = None
     """
     The material of the core.
     """
@@ -122,9 +122,9 @@ class DCCable(Cable):
     """
     A DC cable is a single core cable that is used to transmit direct current.
     """
-    geometry: DCCableGeometryType
-    heat_transfer: DCCableHeatTransferType
-    material_specification: DCCableMaterialSpecificationType
+    geometry: Optional[DCCableGeometryType] = None
+    heat_transfer: Optional[DCCableHeatTransferType] = None
+    material_specification: Optional[DCCableMaterialSpecificationType] = None
 
 
 class CoaxialCable(Cable):
@@ -132,9 +132,9 @@ class CoaxialCable(Cable):
     A coaxial cable is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer,
     surrounded by a tubular conducting shield.
     """
-    geometry: CoaxialCableGeometryType
-    heat_transfer: CoaxialCableHeatTransferType
-    material_specification: CoaxialCableMaterialSpecificationType
+    geometry: Optional[CoaxialCableGeometryType] = None
+    heat_transfer: Optional[CoaxialCableHeatTransferType] = None
+    material_specification: Optional[CoaxialCableMaterialSpecificationType] = None
 
 
 CableHeatTransferTypes = Union[CoaxialCableHeatTransferType, DCCableHeatTransferType]