Latex table inserts new line at the end

Question

I am creating two tables, But somehow, there is an empty line between these two tables.

\begin{table}[!htb]
\begin{center}
\captionof{table}{Properties of the magnetic Resolver}\label{tab:resvprop}
\begin{tabular}{|c|c|}
\hline
\textbf{Parameter} &      \textbf{Value}\\
\hline
Maximum amplitude of the excitation voltage        &       9.0V \\
Excitation frequency  &       10kHz \\   
Number of Pole pairs          &       4 \\
\hline
\end{tabular}
\end{center}
\end{table}
\begin{table}[!htb]
\begin{center}
\captionof{table}{Properties of the Reference Encoder}\label{tab:Encprop}
\begin{tabular}{|c|c|}
\hline
\textbf{Parameter} &      \textbf{Value}\
\hline
Pulses per Revolution/ Line count      &       1024 \
Output signals    &       Sine, Cosine \

Output signal amplitude          &       1.0V\
Accuracy         &       \pm 0.0176\textdegree  \
Power supply               &       DC 5\pm 0.5 V\
\hline
\end{tabular}
\end{center}
\end{table}

How Can I remove the empty space between the two tables?

Answer 1

The excess space is due to two factors

1. center adds vertical space; use \centering instead;
2. two consecutive floats are separated by the amount of \floatsep.

Here's how you can reduce it, still maintaining separate floats.

\documentclass{article}
\usepackage{siunitx}
\sisetup{separate-uncertainty}
\begin{document}
\begin{table}[!htb]
\centering
\caption{Properties of the magnetic Resolver}\label{tab:resvprop}
\begin{tabular}{|l|c|}
\hline
\multicolumn{1}{|c|}{\textbf{Parameter}} & \textbf{Value}\
\hline
Maximum amplitude of the excitation voltage & \SI{9.0}{\volt} \
Excitation frequency                        & \SI{10}{\kilo\hertz} \
Number of Pole pairs                        & 4 \
\hline
\end{tabular}
\end{table}
\begin{table}[!htb]
\centering
\caption{Properties of the Reference Encoder}\label{tab:Encprop}
\begin{tabular}{|l|c|}
\hline
\multicolumn{1}{|c|}{\textbf{Parameter}} & \textbf{Value}\
\hline
Pulses per Revolution/Line count & 1024 \
Output signals                   & Sine, Cosine \

Output signal amplitude          & \SI{1.0}{\volt} \
Accuracy                         & \SI{\pm 0.0176}{\degree} \
Power supply                     & DC \SI{5\pm 0.5}{\volt} \
\hline
\end{tabular}
\end{table}
\end{document}

I used siunitx in order to get correct output for the measurements with their units. I also changed the alignment of the first columns to left.

You might prefer to use a single table environment, though. Here I also modify the table codes for better appearance. But you can take the idea and keep the caged tables, if you prefer.

\documentclass{article}
\usepackage{siunitx}
\usepackage{booktabs}
\sisetup{separate-uncertainty}
\AtBeginEnvironment{table}{%
  \setlength{\belowcaptionskip}{\medskipamount}
  \setlength{\abovecaptionskip}{0pt}%
}
\begin{document}
\begin{table}[!htb]
\centering
\caption{Properties of the magnetic Resolver}\label{tab:resvprop}
\begin{tabular}{@{}lc@{}}
\toprule
\multicolumn{1}{c}{Parameter} & Value \
\midrule
Maximum amplitude of the excitation voltage & \SI{9.0}{\volt} \
Excitation frequency                        & \SI{10}{\kilo\hertz} \
Number of Pole pairs                        & 4 \
\bottomrule
\end{tabular}
\bigskip
\caption{Properties of the Reference Encoder}\label{tab:Encprop}
\begin{tabular}{@{}lc@{}}
\toprule
\multicolumn{1}{c}{Parameter} & Value\
\midrule
Pulses per Revolution/Line count & 1024 \
Output signals                   & Sine, Cosine \

Output signal amplitude          & \SI{1.0}{\volt} \
Accuracy                         & \SI{\pm 0.0176}{\degree} \
Power supply                     & DC \SI{5\pm 0.5}{\volt} \
\bottomrule
\end{tabular}
\end{table}
\end{document}