Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual page 410

TCD
transient
U
UFM
V
V
V ac
V dc
VGA
W
w
W
NOTE The symbol for a compound unit that is a quotient (for example, degrees Celsius per
minute or grams per liter) is written with a negative exponent with the denominator. 
For example:
-1
C min
-1
g L instead of g/L
Thermal Conductivity Detector
A brief voltage surge of up to several thousand volts, with a
duration of less than 50 µs.
Ultra Fast Module
volt
volts, alternating current
volts, direct current
Video Graphics Array
Width
Watt
instead of C/min 