diff --git a/include/libsigrok/libsigrok.h b/include/libsigrok/libsigrok.h
index 508ea3bd..bb0b4fe7 100644
--- a/include/libsigrok/libsigrok.h
+++ b/include/libsigrok/libsigrok.h
@@ -956,6 +956,8 @@ enum sr_configkey {
 	 * Channel regulation
 	 * get: "CV", "CC" or "UR", denoting constant voltage, constant current
 	 *      or unregulated.
+	 *      "CC-" denotes a power supply in current sink mode (e.g. HP 66xxB).
+	 *      "" is used when there is no regulation, e.g. the output is disabled.
 	 */
 	SR_CONF_REGULATION,
 
diff --git a/src/hardware/scpi-pps/api.c b/src/hardware/scpi-pps/api.c
index d1dab458..22c79740 100644
--- a/src/hardware/scpi-pps/api.c
+++ b/src/hardware/scpi-pps/api.c
@@ -313,6 +313,7 @@ static int config_get(uint32_t key, GVariant **data,
 	char *channel_group_name;
 	int cmd, ret;
 	const char *s;
+	int oper_cond;
 
 	if (!sdi)
 		return SR_ERR_ARG;
@@ -419,24 +420,45 @@ static int config_get(uint32_t key, GVariant **data,
 		channel_group_cmd, channel_group_name, data, gvtype, cmd);
 	g_free(channel_group_name);
 
+	/*
+	 * Handle special cases
+	 */
+
 	if (cmd == SCPI_CMD_GET_OUTPUT_REGULATION) {
-		/*
-		 * The Rigol DP800 series return CV/CC/UR, Philips PM2800
-		 * return VOLT/CURR. We always return a GVariant string in
-		 * the Rigol notation.
-		 */
-		s = g_variant_get_string(*data, NULL);
-		if (!strcmp(s, "VOLT")) {
+		if (devc->device->dialect == SCPI_DIALECT_PHILIPS) {
+			/*
+			* The Philips PM2800 series returns VOLT/CURR. We always return
+			* a GVariant string in the Rigol notation (CV/CC/UR).
+			*/
+			s = g_variant_get_string(*data, NULL);
+			if (!g_strcmp0(s, "VOLT")) {
+				g_variant_unref(*data);
+				*data = g_variant_new_string("CV");
+			} else if (!g_strcmp0(s, "CURR")) {
+				g_variant_unref(*data);
+				*data = g_variant_new_string("CC");
+			}
+		}
+		if (devc->device->dialect == SCPI_DIALECT_HP_66XXB) {
+			/* Evaluate Operational Status Register from a HP 66xxB. */
+			s = g_variant_get_string(*data, NULL);
+			sr_atoi(s, &oper_cond);
 			g_variant_unref(*data);
-			*data = g_variant_new_string("CV");
-		} else if (!strcmp(s, "CURR")) {
-			g_variant_unref(*data);
-			*data = g_variant_new_string("CC");
+			if (oper_cond & (1 << 8))
+				*data = g_variant_new_string("CV");
+			else if (oper_cond & (1 << 10))
+				*data = g_variant_new_string("CC");
+			else if (oper_cond & (1 << 11))
+				*data = g_variant_new_string("CC-");
+			else
+				*data = g_variant_new_string("UR");
 		}
 
 		s = g_variant_get_string(*data, NULL);
-		if (strcmp(s, "CV") && strcmp(s, "CC") && strcmp(s, "UR")) {
-			sr_dbg("Unknown response to SCPI_CMD_GET_OUTPUT_REGULATION: %s", s);
+		if (g_strcmp0(s, "CV") && g_strcmp0(s, "CC") &&
+			g_strcmp0(s, "CC-") && g_strcmp0(s, "UR")) {
+
+			sr_err("Unknown response to SCPI_CMD_GET_OUTPUT_REGULATION: %s", s);
 			ret = SR_ERR_DATA;
 		}
 	}
diff --git a/src/hardware/scpi-pps/profiles.c b/src/hardware/scpi-pps/profiles.c
index c9ddd61e..6d52b05b 100644
--- a/src/hardware/scpi-pps/profiles.c
+++ b/src/hardware/scpi-pps/profiles.c
@@ -460,6 +460,7 @@ static const uint32_t hp_6630b_devopts_cg[] = {
 	SR_CONF_CURRENT_LIMIT | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
 	SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
 	SR_CONF_OVER_CURRENT_PROTECTION_ENABLED | SR_CONF_GET | SR_CONF_SET,
+	SR_CONF_REGULATION | SR_CONF_GET,
 };
 
 static const struct channel_spec hp_6633a_ch[] = {
@@ -520,6 +521,7 @@ static const struct scpi_command hp_6630b_cmd[] = {
 	{ SCPI_CMD_SET_OVER_CURRENT_PROTECTION_DISABLE, ":CURR:PROT:STAT 0" },
 	{ SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_THRESHOLD, ":VOLT:PROT?" },
 	{ SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_THRESHOLD, ":VOLT:PROT %.6f" },
+	{ SCPI_CMD_GET_OUTPUT_REGULATION, "STAT:OPER:COND?" },
 	ALL_ZERO
 };