Glossary - Fluke PM6690 Service Manual

Electrostatic Discharge
Almost all modern components have extremely thin conduc-
tors and metal oxide layers. If these layers are exposed to elec-
trostatic discharge they will break down or perhaps even
worse, be damaged in a way that inevitably will cause a break-
down later on. The Electro-Static Discharge sensitivity of
MOS and CMOS semiconductors have been known quite a
while, but nowadays bipolar semiconductors and even preci-
sion resistors are ESD sensitive. Consider therefore all com-
ponents, pc-boards and sub-assemblies as sensitive to electro-
static discharge. The text below explains how you can mini-
mize the risk of damage or destroying these devices by being
aware of the problems, and learning how to handle these com-
ponents.
ESD sensitive options are packed in conductive containers
marked with this symbol.
• Never open the container unless you are at an ESD pro-
tected work station.
• Use a wrist strap grounded via a high resistance.
• Use a grounded work mat on your workbench.
• Never let your clothes come in contact with ESD sensitive
equipment even when you are wearing a grounded wrist
strap.
• Never touch the component leads.
• Never touch open connectors.
• Use ESD-safe packing materials.
• Use the packing material only once.
• Keep paper and nonconductive plastics etc. away from your
workbench. These may block the discharge path to ground.

Glossary

C
Calibration Ad- How to restore an instrument to perform in
justments agreement with its specifications.
CSA Canadian Standards Association
E
EN 61010-1 International safety standard
F
FLASH PROM Electrically erasable and reprogrammable
non-volatile semiconductor memory.
FPGA Field Programmable Gate Array
G
GPIB General Purpose Instrumentation Bus used for
interconnecting several measuring instruments
to a common controller.
I
2
I C-bus An internal address and data bus for communi-
cation between microcontroller, measuring logic,
and options.
IEC International Electrical Commission
L
LCD Liquid Crystal Display
O
OCXO Oven-Controlled X-tal Oscillator
P
PCA Printed Circuit Assembly
PCB Printed Circuit Board
Performance A procedure to check that the instrument is
Check functionally operational and performs to its
specification. Must not require opening of cabi-
net. If the instrument passes the check it is con-
sidered calibrated.
PLL Phase-Locked Loop
Prescaler RF frequency divider
PWM Pulse Width Modulation
U
UCXO Un-Compensated X-tal Oscillator
USB The Universal Serial Bus is a simpler alternative
to GPIB.
Electrostatic Discharge 10-3