Transforming Technologies Ohm Metries SRM320 User manual

T R A N S F O R M I N G T E C H N O L O G I E S , L L C
O U T S T A N D I N G A L T E R N A T I V E S I N S T A T I C C O N T R O L
Pock e t St a t ic Fie ld M e t e r
Model SRM320
I nstruction Manual
Ohm Metrics™

Con t en t s
1D escr ipt ion
SRM320 1
Ohm Met rics 1
2Operat ion
Underst anding Surface Resistivit y 2
Reading Met er Result s 3
Operat ion: I nternal Elect rodes 5
Operat ion: Ext ernal Electrodes 5
Resist ance Between Two Points 6
Resist ance to Ground 7
Volum e Resist ance 8
3Specifica t ion s 9
4Service and W arrant y 10

1
Ohm Metrics Pocket Resistance Meter:
SRM 320
The SRM320 Surface Resistance Met er is an easy t o use
t est er for m easuring surface resist iv it y. This SRM 320 uses
parallel electrodes and concent ric rings to accurately
m easure RTT, RTG, or resist ivit y for periodic verificat ion,
fact or y audit s or t est lab ev aluat ion of pr oduct .
This m et er is designed t o be used in all facet s of m at erial
product ion including engineering, m aintenance, qualit y
cont rol, incom ing inspect ion, m anufact uring, research, or
sales depart m ent s for t he test ing of ant i- static m at s, floor
finishes, paint s, wrist st raps, sm ocks, foot wear, bags and
cont ainers.
The SRM310 m eets periodic t est requirem ent s per Com pli-
ance Verificat ion ESD TR53 and confor m s t o ANSI / EOS/
ESD ( S4.1, S7.1, S12.1, S2.1) .
Ohm Met rics t est and m easurem ent product s, from
Transform ing Technologies, are useful, reliable tools for
charact erizing and ident ifying t he elect rical resist ance of
m at erials and t he per form ance of personal grounding
product s.
 All Ohm Met rics product s are designed to support ESDA
Com pliance Ver ificat ion TR53.
 All Ohm Met rics product s can be calibrat ed.
 All Ohm Met rics test and m easurem ent product s are
warrant ed for 1 full year.

2
Un der st a n din g Sur fa ce Re sist iv it y
For ESD purposes, m at erials are classified by t heir resist ance
t o the m ovem ent of elect ricit y. The following ranges and
definit ions ar e found in ESD Associat ion or EI A st andar ds
publicat ions.
Condu ct ive m a t e ria ls: Wit h a low elect rical resist ance,
elect rons flow easily across the surface or through t he bulk
of t hese m at erials. Charges go t o ground or t o another con-
ductive obj ect t hat t he m aterial cont acts or com es close t o.
Conductive m at erials have a surface resist ivit y less than 1 x
105 Ω/sq or a v olum e resist ivit y less t han 1 x 104 Ω- cm .
D issipa t iv e m a t er ia ls: For t hese m at erials, t he char ges
flow t o ground m ore slow ly and in a som ewhat m ore con-
t rolled m anner t han w it h conduct ive m at erials. Dissipat ive
m at erials
have a surface resist ivit y equal t o or great er t han 1 x 105 Ω/
sq but less t han 1 x 1012 Ω/sq or a volum e resist iv it y equal
to or greater t han 1 x 104 Ω- cm but less than 1 x 1011 Ω-
cm .2
I n su la t iv e m a t er ia ls: I nsulat ive m at er ials prev ent or lim it
the flow of electrons across their surface or t hrough their
volum e. I nsulat ive m at erials have a high elect rical resist ance
and are difficult t o gr ound. St at ic charges rem ain in place on
t hese m at erials for a very long t im e. I nsulat ive m at er ials
are defined as those having a surface resist ivity of at least 1
x 1012 Ω/sq or a volum e r esist iv it y of at least 1 x 1 011 Ω- cm .

3
Re ad in g M et e r Resu lt s
The LED light s on t he m et er indicat es how
m uch resist ance a surface has and if it is
“Conductive”, “Dissipative” or “Insulating”
by flashing colored LED light s. The t ester
value is indicat ed on t he LED display in
Ohm s or Ohm s per square inch.
DECADE SCALE
103= 1 kilohm
104= 10 kilohm s
105 = 100 kilohm s
3 x 105= 300 kilohm s
106= 1 m eg ohm
3 x 106= 3 m eg ohm
107= 10 m eg ohm s
3 x 107= 30 m eg ohm s
108= 100 m eg ohm s
3 x 108= 300 m eg ohm s
109= 1000 m eg ohm s
3 x 109= 3000 m eg ohm s
1010 = 10,000 m eg ohm s
1011 = 100,000 m eg ohm s
1012 = 1,000,000 m eg ohm s
TEST VOLTAGE
The test volt age ranges are 10v and 100v. According t o
ESDA st andards S4.1, S7.1, and S11.11, 10 volts should be
applied for conduct ive surfaces less t han 106and 100v for
COLOR I N D I CAT I N G FU N CTI ON ohm
Green Conductive 103-105
Yellow Dissipative: ideal test measurement 3 x 105- 109
Orange Dissipative but nearing insulative level 3 x 109–1010
Red Near insulative to insulative 1011 - 1012
The Decade Scale is
short han d for elect rical
m easurem ent s, dis-
played in powers of 10.
Half decades provide
great er accuracy by giv-
ing a closer indicat ion t o
t he m easur em ent value.
A decade will bright en
to t he according test
result. Colors signify the
test value’s function.

4
m at erials 106or gr eat er . The SRM320 w ill aut om at ically
generat e proper volt age according t o t est m easurem ent .
TEM PERATURE AN D H UM I D I TY
Hum idit y and tem perat ure affect the elect rical propert ies
of t he m ost m at erials being t est ed. I t is possible to test or
m anufact ure a m at er ial at high hum idit y and pass all t he
t est specificat ions, but w hen t he cust om er r eceives t he
m at erial and used it at a lower hum idit y or tem perat ure
t he m at er ial fails t o pass the specificat ions. This can cause
rej ect s and loss of pr oduct . ANSI / ESD Associat ion and
Eur opean CECC recognize t he env ironm ent al effect s t o t est
m easurem ents and specify in their st andards t hat t hey
m easured and recorded.
At high hum idit y a t hin lay er of w at er is condensed or ab-
sorbed on or in t he m aterial and w ill increase the elect rical
conduct iv it y. Conver sely, t he com binat ion of low hum idit y
and low t em perat ure will give t he m at erial t he highest
elect r ical r esist ance result s ( or slow est dissipat ion t im es) .
At elevat ed t em per at ures t he m obilit y of free elect rons is
increased t hereby increasing t he m at erials conduct iv it y.
When t he m at erial is at a lower t em per at ure, built in
st resses occur which m ight increase t he resist ance due t o
increased dist ance between t he conductive addit ives.
Thus, hum idity and tem perature m ust be known and
should be recorded wit h t est result s.
Op er at ion
The SRM320 can t est m at erials in t wo ways, using int ernal
parallel resist ivit y probes locat ed on t he back of t he m et er
or w it h ex t er nal 5lb elect r ode probes ( sold separat ely) .

5
Op er at ion : I nt e rn al Ele ct r ode s
The parallel resist ivit y probe m et hod
com plies wit h EOS/ ESD- S11.11. I t is
used t o giv e fast elect r ical resist iv it y
m easurem ents on flat hom ogeneous
m at erials. I t m ay be used on m ult ilay-
ered m at erials, but t his should be not ed
along wit h t he tem perat ure and hum idit y
value on t he dat a repor t. When t he
m easurem ent is t aken bet ween t he
tester’s two mesh rails under the tester, the tester will in-
dicat e t he surface resist ivit y of t he m at er ial being t est ed.
1. Prior t est ing, m ake cert ain t hat surfaces t o be
t est ed are clean and free of cont am inant s.
2. Allow the m et er t o equilibrat e to t he at m osphere
the m et er is to be used in. I t m ay t ake a half hour
for t he m et er t o adj ust t o envir onm ent condit ions.
3. Place the m et er on t he desired surface t o be test ed
and press and hold the red t est button.
4. When using t he built - in electrodes, the meter’s test
values for surface resist ivit y are in ohm s per square
( alt hough t hey ar e displayed in ohm s) .
5. The test value is indicated on t he LED display. A
decade will br ight en t o t he accor ding t est value.
6. Colors signify the test value’s function (see page 3).
Op er at ion : Ex t er na l Ele ct r ode s
By connect ing t he opt ional surface resis-
tance probes to the SRM320 meter, it’s
possible t o m easure other form s of re-
sist ance su ch as Point t o Point ( RTT) Re-
sist ance, Surface t o Gr ound ( RTG) , and
Volum e Resist ance. Using these probes
will allow com pliancy wit h var ious st an-

6
dards including ANSI / ESDA S4.1 for Work surface –Resist ance
Measurem ent , ANSI / ESDA S7.1 Resist ive Charact er izat ion of
Materials - Floor Materials.
N ot e : W h en t h e m e a su r em e nt is t a k en u sin g t he 5 lb e x -
t e rn a l pr obes, t he t e st er w ill in dica t e t h e r e sist a nce of
t h e m a t er ia l in oh m s.
Re sist a n ce be t w e en Tw o Poin ts ( RTT)
RTT m easurem ents can be used for t he evaluat ion of floors,
chairs, cart s, work surfaces and ot her ESD cont rolled m at er ials
and products.
1. Connect one end of each of t he banana test leads int o
the socket s of the m et er.
2. Connect ot her end of t he t est coil cords in t o t he 5 pound
probes.
3. Place bot h probes on
t he m at er ial according
to t est procedures or
st andard being used -
nor m ally 3 feet ( 36
inches) apart .
4. Press the “TEST” but-
ton and the value will
be displayed on t he
LCD. The m et er will
apply t he cor rect volt -
age ( 10v or 100v) according t o t he value of what is
m easured.
5. When perfor m ing t est do not t ouch lead wires or probes.
Avoid over lapping of lead wires. This will ensure accurat e
readings.

7
M ea su rin g r esist a nce t o gr ou nd ( RTG)
Resist ance t o gr ound m easures t he elect rical pat h bet ween a
point on a sur face t o electrical ground. I t can be used for t he
evaluat ion of floors, chair s, cart s, wor k surfaces and ot her ESD
cont rolled m at erials and product s.
1. To test RTG on a surface, connect the first lead to t he
m et er and to a 5lb probe and put probe on t he surface.
Connect t he 2nd lead t o the m et er and t o a groundable
point ( RTGP) .
2. To at t ach lead to RTGP, slip t he alligat or clip t o t he lead
and connect it t o t he ground snap or connect the banana
plug t o a com m on point ground plug.
3. Press the “TEST” button and the value will be displayed
on t he LED. When perform ing t est do not touch lead
wires or probe. Avoid overlapping of lead wires. This will
ensure accurat e readings.
4. Resist ance values are in ohm s. When recor ding test val-
ues also not at e t he tem perat ure and hum idity as the en-
vironm ent can affect t est r esult s.

8
Volu m e Re sist a nce M e a su r em e nt
Volum e Resist ance m easures t he elect rical pat h through a
m at erial. N ot e : Th is m et h od r e quir es a m e t al p la t e ( su ch
a s st a in le ss st e e l) t h at is n ot su pp lie d by Tr an sfor m in g
Te chnologies.
1. Connect one end of each of t he banana test leads int o
the socket s of the m et er.
2. Connect t he ot her end of the t est coil cords into 5
pound probes.
3. Place sam ple m at erial on a conduct ive m et al plate.
Place one of the 5 pound probes on t he m aterial so t hat
the m at erial is sandw iched between the probe and
m et al plat e. ( see below)
4. Place t he second 5 pound probe on t he conduct ive
m et al plat e.
5. Press the “TEST” button and the value will be displayed
on the LED. Volum e Resist ance is in ohm s- cm .

9
SPECI FI CATI ON
Dim ension: approx. 70m m x 130m m x 35m m
Weight : approx. 103 gram s
Power: Bat t ery operat ed PP3 9 volt
Connect ions: 2 x 3.5m m j ack plug for each ear th connec-
tion
Test Range: 103 t o 1012
Dissipat ive Range: 3 x 105 to 3 x 109 1/ 2 Decade bet ween
each decade on a logarithm ic scale
Exam ple: 1x 105 x 3.21 = 3 x 105 ( 1/ 2 Decade Meas-
urem ent) x 3.21 = 1 x 106
Measurem ent : Sur face Resist iv it y ( Ohm s per squar e)
Point t o Point Resist ance ( Ohm s)
Accuracy: + / - 0.5 Decade in Conductive Range
+ / - 0.25 Decade in Dissipat ive Range

About Transform ing Tech nologie s
Since 1998, Transform ing Technologies has helped elec-
tronic m anufact uring facilit ies t o prot ect their products and
processes fr om t he m any serious problem s associat ed wit h
st at ic elect r icit y .
Transform ing Technologies offers a wide range of unique
and out standing product s t o det ect , prot ect , elim inat e and
m onit or elect rost at ic charges. Our product s are int egral com -
ponent s of an eff ect iv e st at ic cont rol pr ogr am .
Se rvice a nd W a rr an t y
Transfor m ing Technologies, LLC provides a lim it ed war-
rant y for the Model SRM320. All new product s are guaranteed
t o be fr ee from defect s in m at erial and workm anship for a pe-
riod of one ( 1) year from t he dat e of shipm ent . Liabilit y is lim -
it ed t o servicing ( aft er evaluat ing, repairing or replacing) any
product ret urned t o Transform ing Technologies. The com pany
does not warrant dam age due t o m isuse, neglect, alt erat ion
or accident . I n no ev ent shall Transfor m ing Technologies be
liable for collat er al or consequent ial dam ages.
To receive service under warrant y , please contact Trans-
form ing Technologies Technical Support .
Phone: [phone]
Fax: [phone]
E-mail: info@ transf orming-technologies.com
3719 King Rd.
Toled o, O hio 4 3617
TRA N SFO RM IN G TECH N O LO G IES, LLC