TABLE OF CONTENTS | A | Ampere (electric current) | |
| A-O | Acoustic-optic transducers | |
| A/D | Analog to digital | |
| ADC | Analog-to-digital converter | |
| AFM | Atomic force microscope | |
| AKC | Automatic level control | |
| AM | Amplitude modulation | |
| ANSI | American National Standards Institute | |
| ASCII | American Standard Code for Information Interchange | |
| ASIC | Application specific integrated circuit | |
| ASTTL | Advanced Schottky Transistor transistor logic | |
| ATE | Automatic test equipment | |
| ATN | Attention (used by controllers) | |
| B | Susceptance | |
| BER | Bit error rate | |
| BERT | Bit error rated testing | |
| BOB | Break out box | |
| C | Capacitance | |
| CCITT | International Telephone and Telegraph Committee | |
| CCOTDR | Complementary code OTDR | |
| cd | Candela (luminous intensity) | |
| CF | Crest factor | |
| CGA | Color graphics adapter | |
| ChemFET | Chemical field effect field-effect transistor | |
| CMR | Common mode rejection | |
| CPU | Central processing unit | |
| CPW | Coplanar waveguide | |
| CRC | Cyclic redundancy checksum | |
| CRT | Cathode ray tube | |
| CW | Continuous wave | |
| D | Dissipation factor | |
| D/A | Digital to analog | |
| DAC | Digital-to-analog converter | |
| dBm | Decibels referred to 1 mW of power | |
| DCE | Data communications equipment | |
| DDS | Direct digital synthesis | |
| DDS | Direct digital signal | |
| DAV | Data valid | |
| DFB | Distributed feedback laser | |
| DFT | Direct Fourier transform | |
| DH | Double heterostructure | |
| DIP | Dual inline package | |
| DMA | Direct memory access | |
| DMM | Digital multimeter | |
| DMs | Degraded minutes | |
| DNL | Differential nonlinearity | |
| DNL | Differential Nonlinearity of ADC | |
| DNRZ | Delayed not return to zero | |
| DOP | Degree of polarization | |
| DSP |
