correction in pmt_ro.pm in the signal_thresh sub

diff --git a/user_interface/pmt_ro.pm b/user_interface/pmt_ro.pm
index 17d7a2d0fecec848a5df0b0157b3af8a4d6a88e1..0324586dd5e5ba533fbed4ab89f6eb81b6a0f322 100644 (file)
--- a/user_interface/pmt_ro.pm
+++ b/user_interface/pmt_ro.pm
@@ -193,7 +193,7 @@ sub signal_thresh {
   
   my $value = $options{value};
   
-  if($value){
+  if(defined($value)){
     #if value is given, write threshold
     $self->write_register(regName => "signal_thresh", value => $value+$self->{settings}->{signal_zero});
     $self->{settings}->{signal_thresh} = $value;