hameg-hmo: Add comment clarifying coupling options

50 Ohm termination is only available on the higher end scopes.

diff --git a/src/hardware/hameg-hmo/protocol.c b/src/hardware/hameg-hmo/protocol.c
index 3c095e9cbd817f43d6105ff1ef490a1c8bef3960..1f5e5de77b0f916787d8eb61a513e7e0b253c1b8 100644 (file)
--- a/src/hardware/hameg-hmo/protocol.c
+++ b/src/hardware/hameg-hmo/protocol.c
@@ -68,10 +68,10 @@ static const uint32_t hmo_analog_devopts[] = {
 };
 
 static const char *hmo_coupling_options[] = {
-       "AC",
-       "ACL",
-       "DC",
-       "DCL",
+       "AC",  // AC with 50 Ohm termination (152x, 202x, 30xx, 1202)
+       "ACL", // AC with 1 MOhm termination
+       "DC",  // DC with 50 Ohm termination
+       "DCL", // DC with 1 MOhm termination
        "GND",
        NULL,
 };