Electrostatic Discharge
Almost all modern com ponent s 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 sensitiv ity of
MOS and CMOS semiconductors have been known quite a
while, but nowadays bipolar semi conduct ors 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
-
justments
How to restore an instrument to perform in
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
I
2
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
Check
A procedure to check that the instrument is
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
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