diff --git a/src/qcodes_contrib_drivers/drivers/Tektronix/Keithley_6430.py b/src/qcodes_contrib_drivers/drivers/Tektronix/Keithley_6430.py
index ac87b1ae7..239c4b2d1 100644
--- a/src/qcodes_contrib_drivers/drivers/Tektronix/Keithley_6430.py
+++ b/src/qcodes_contrib_drivers/drivers/Tektronix/Keithley_6430.py
@@ -46,7 +46,7 @@ def __init__(self, name: str,
                            get_parser=float,
                            set_cmd='SENS:VOLT:PROT {}',
                            get_cmd='SENS:VOLT:PROT?',
-                           vals=Numbers(1e-12, 210)
+                           vals=Numbers(0.2e-3, 210),
                            )
         self.add_parameter('source_current_compliance_tripped',
                            get_cmd='SENS:CURR:PROT:TRIP?',