General Radio founded in 1915 |
1915 |
Condenser |
1918 |
Decade Bridge |
1920 |
Variable Air Condenser |
1923 |
Invented the Binding Post |
1923 |
Direct Reading Wavemeter |
1926 |
String Oscillograph |
1927 |
Direct Reading Ohmmeter |
1928 |
Vacuum Tube Bridge |
1929 |
Output Meter |
1930 |
Decade Resistor |
1930 |
Decade Condenser |
1930 |
Piezo Electric Oscillator |
1931 |
Frequency Meter |
1931 |
Vacuum-Tuber Voltmeter |
1933 |
Impedance Bridge |
1933 |
Noisemeter |
1933 |
Microvoltmeter |
1933 |
Volume Control |
1934 |
Oscilloscope |
1935 |
Variable Inductor |
1936 |
Megohmmeter |
1937 |
Sound Level Meter |
1937 |
Voltage Divider |
1938 |
Variac |
1932 |
Edgerton Stroboscope |
1940 |
Broadcast Frequency Monitor |
1956 |
dc Amplifier and Electrometer |
1956 |
TV Transmitter Monitor |
1961 |
Tuned Amplifier and Null Detector |
1976 |
Modern LCR Meter "Digibridge" |
and much more…Improvements on these and other products continued in the years that followed… |
|
|
esi founded in 1944 |
1960-1970’s |
SR-104 0.5 ppm Resistance Standard |
1960-1970’s |
RS925 First 20 ppm Resistance Decade Box |
1960-1970’s |
242D First 10 ppm Resistance Measurement System |
|
IET Labs founded in 1975 |
1975 |
RS/CS/LS Series Thumbwheel R-L-C Decade Substituters |
1977 |
DM-45 First Pocket Autoranging DMM |
1979 |
CM-500 Capacitance Meter |
1980-1990’s- |
PZS-First Programmable R-L-C Decades |
1980-1990’s- |
SRL-High Accuracy Resistance Standards from 1 mΩ - 10 TΩ |
1980-1990’s- |
HRRS-High Resistance, High Voltage Resistance Decades |
1980-1990’s- |
KVD-High Performance Kelvin-Varley Voltage Dividers |
2000 |
IET Acquires GenRad Classic Product Line |
2002 |
Expanded the 1482 inductance series from 1 uH - 100 T |
2004 |
Released Capacitance Standards as high as 10,000 µF |
2006 |
IET Acquires GenRad Megohmmeters and Digibridges |
2006 |
IET Acquires esi Resistance Line |
2009 |
SR103; 0.5 ppm stability resistance standards at 1 kΩ |
2010 |
The 1865+ Megohmmeter |
2011 |
1404 10 nF Capacitance Standard |
2011 |
Upgraded the Digibridge IEEE Board |
2013 |
HPRS-Hipot-Load High Power Resistive Load |
2014 |
Redesign of LOM-510A Milliohmmeter |
2016 |
Released PRS-300 Programmable Decade Resistor |
2018 |
Redesign of 1986 Omnical Sound Level Calibrator |
2019 |
Released SRAC ac Standard Resistors |
2019 |
Released PRS-330 Programmable Decade Resistor |
2019 |
Released PRS-370 Self-Adjusting Programmable Resistance Decade Substituter |