diff --git a/geomagio/Metadata.py b/geomagio/Metadata.py
index 9fce2c3b2ad7c653c5333e6c4af61664c504e807..080b67fbd5f23ede739c3230c4e3c94b3c69d51a 100644
--- a/geomagio/Metadata.py
+++ b/geomagio/Metadata.py
@@ -490,9 +490,9 @@ _INSTRUMENT_METADATA = [
             "channels": {
                 # each channel maps to a list of components to calculate nT
                 # TODO: calculate these lists based on "FGE" type
-                "U": [{"channel": "U_Volt", "offset": 0, "scale": 944.935}],
+                "U": [{"channel": "U_Volt", "offset": 19750, "scale": 944.935}],
                 "V": [{"channel": "V_Volt", "offset": 0, "scale": 964.909}],
-                "W": [{"channel": "W_Volt", "offset": 0, "scale": 966.893}],
+                "W": [{"channel": "W_Volt", "offset": 48050, "scale": 966.893}],
             },
             # this info should get updated when available
             "electronics": {