diff --git a/src/pycbsdk/cbhw/device/nsp.py b/src/pycbsdk/cbhw/device/nsp.py
index 4421f91..f028a19 100644
--- a/src/pycbsdk/cbhw/device/nsp.py
+++ b/src/pycbsdk/cbhw/device/nsp.py
@@ -1015,7 +1015,8 @@ def get_config(
             # Clear out our existing config
             self._config["proc_chans"] = 0
             self._config["channel_infos"] = {}
-            self._config["sysfreq"] = None
+            # Do not clear sysfreq if we already have it as this cannot change.
+            self._config["sysfreq"] = self._config.get("sysfreq", None)
             time.sleep(0.1)
             pkt = self.packet_factory.make_packet(
                 None,