Tektronix DM2510 Manual

Tektronix
Product :
DM2510 / DM2510G
Issue
Date :
May 6
,
1994
Approved
:
Roy
Lindley
Title
:
Adjustment
Procedure
REVISION
LEVEL
SUMMARY
:
Service
Procedure
File
Location :
T & M
Service
Support
,
Beaverton ,
Del . Sta .
19-083
Revision #
Date
DM2510
/
DM2510G
Page 1
of
17
Revision
Level A
is the
origination
Level for
this
Procedure
.
Level
Change
From :
To :
Revision Level A
Roy
Lindley
Initiator
Adjustment
Procedure
May
6
,
1994
Description
Revision A

DM2500 DM2510G Adjustment Procedure
Introduction
Calibration
interval
Environmental
Conditions
Recommended
Test
Equipment
Internal
Adjustments
Preparation for Adjustment
Adjustment
Procedures
DM2510
/
DM2510G
Page 2
of
17
Contents
Introduction
Front
Panel
Calibration
Command
Sequence
1.
Adjustment
:
DC
Voltage
Accuracy
2.
Adjustment :
Resistance
Accuracy
3.
Adjustment
:
AC
Voltage
Accuracy
Adjustment :
R113 (
Frequency
Comp . )
Adjustment : R121 ( AC stage DC offset )
Adjustment
:
AC
Voltage
ranges
4.
Adjustment :
DC
Current
Accuracy
5.
Adjustment
:
AC
Current
Accuracy
6.
Adjustment
:
Temperature
Accuracy
Adjustment
Procedure
May
6 ,
1994
Page
3
3
3
3
4
5
5
6
7
7
8
10
11
11
12
12
14
15
16
Revision A
1
1

Introduction
ADJUSTMENT
PROCEDURE
Use of this adjustment procedure to restore DM2510G or DM2510 to the
original performance requirements . This procedure needs not to be performed
unless
the
Performance
Check
Procedure cannot be
completed
satisfactorily or
the
instrument
fails
to
meet the
Performance
Requirements
of
the
electrical
characteristics listed in the Specification section in the DM2510G / 2510
instruction
manual
(
Part
No.
070-8479-00 ) .
Calibration Interval
Adjustment should be performed if the performance check procedures show
that
the
DM2510G /
DM2510 is
out of
specification
.
Calibration is also
recommended
following
instrument
repair
or
modification
.
Environmental
Conditions
Calibration
should be
performed
under
laboratory
conditions
having an
ambient temperature of 22 - 240C and a relative humidity of less than 70 % .
The DM2510G
/
2510
must
be
turned on and
allowed to
warm
up
for at
least
30
minutes
before
beginning
the
performance
checks .
After
exposure to
or
storage
in
high
humidity (
condensing )
environment ,
one
hour
warm
-
up
time is
required
.
Recommended
Test
Equipment
The
Test
equipment
listed in
Table 1 , or
equivalent
is
suggested to
perform the
DM2510G
/
2510
calibration
.
Alternate
equipment
may be
used as
long as
the
accuracy is at least as good as the specifications listed in the table .
DM2510 / DM2510G
Page
3 of
17
Adjustment
Procedure
May 6 ,
1994
Revision A
S

TEST
EQUIPMENT
REQUIREMENTS
Description
Performance
Specifications
Calibration
DC
Voltage :
Range ,
to
Generator
1000V , accuracy : ± 0.005 % .
AC Voltage : Range to 1000V ,
accuracy :
± 0.1
% ,
20
Hz
20kHZ
AC
Power
Amplifier
Digital
Multimeter
Shorting
plug
Temperature
Table 1
DM2510 / DM2510G
Page
4
of
17
AC
Current :
Range
to
2A ,
accuracy
: ±
0.1
% ,
20Hz -
10kHz
DC
Current
:
Range to
2A
,
accuracy :
±
0.01
%
Resistance : to 20
MQ ,
accuracy
:
±
0.01
%
DC
Volts
accuracy : ≥
0.5
%
Temperature bath :
°
C
+/-
0.1 °
C
,
100 ° C +/- 0.1 ° C
Used
for
DC
Volts
AC Volts
Set DC
offset
voltage
Example
Fluke
Model
5700A
Fluke
Model
5100B
Adjustment
Procedure
May 6
,
1994
Fluke
5215A
Tektronix
DM251
Tektronix P / N
134-0012-00
Temperature
RTE 4
Neslab
probe
Internal
Adjustments
The
entire
calibration
procedure
may be
performed
without
having
to
make
any internal adjustments if AC compensation has been verified . Calibration
can be performed by either of two methods :
( 1 ) from
the front
panel
or ( 2 )
over the
IEEE - 488
bus (
GPIB ) .
To
make
internal
adjustments ,
you
must
remove the top
of the
cabinet to
access
the component side of the main board .
All
other
calibrations
need
to be
performed
with
the
top of the
cabinet
closed .
Revision A
¡

B
Preparation for Adjustment
1 .
2 .
3 .
4 .
5 .
6 .
7 .
Disconnect
the
power
cord
from DM2510
and
remove the
top of
the
cabinet .
A
calibration
enable
jumper
is
positioned
behind the
front panel on the
switch
board
assembly .
Place the
jumper in
the
lower
position (
marked
"
CAL
"
)
and set
the cover in
place on
the
unit
.
Check
that
the
line
selector
( on
the
rear
panel
cabinet ) is
set to
the
correct
voltage
.
Turn
on
the
power .
Check to
see if
the
calibration
jumper
is in
the "
CAL "
position
by
noticing that the
"
AUTO " led is
constantly
blinking .
Check to
see if
the
DMM is
set at
the
proper
line
-
frequency (
50 or
60
Hz
) .
Allow the
instrument to
warm
up
for at
least
30
minutes
before
continuing
with
the
adjustment
procedure .
( See Environmental
Conditions
above . )
Adjustment
Procedures
NOTE
In the following procedure , either the DM2510G or the
DM2510
instruments
are
referred
to
as
DMM .
The
following steps
are for
adjusting
the
DM2510G or
DM2510 , for each
of the
six
measuring
functions : DC
voltage ,
TRMS AC
voltage
,
resistance ,
TRMS
AC
current , DC
current
and
temperature
.
These
procedures
are
intended
for
use by
qualified
personnel
using
accurate and
reliable test
equipment
.
The
dBm
and
dBV
functions
are
recalculated
AC
Voltage
ranges
.
Calibrating
the AC Voltage will suffice .
All
following
measurement
procedures
need
to
be
performed
with the
following
settings :
4.5 digit resolution
NULL -
mode :
OFF
In
RUN
mode
DM2510
/
DM2510G
Page
5
of
17
(
Right
hand
digit
ON
)
( NULL - led OFF )
(
HOLD
- led
OFF )
Adjustment
Procedure
May
6 ,
1994
Revision
A
1
}

Introduction
WARNING
To prevent a shock hazard , do not exceed 1000V peak
between input low
and
chassis
ground
.
Some of the
procedures in
this section
may
expose
the
user to
dangerous voltages . Use standard safety precautions
when such
dangerous
voltages
are
encountered .
The
DM2510G
and
DM2510 are
software
calibrated by
constants that are
stored
in EEPROM . Every range has its own calibration values : an offset and a gain .
In
this way ,
there is no
interference
between ranges ;
re -
calibrating
one
range ,
will not
change
other
ranges . All
DC
voltage and
DC
current
ranges
have
a
positive and a
negative
offset value
,
and a
positive and a
negative gain
.
When
taking
a
measurement
,
the offset
value is first
subtracted from the
measurement
counts
that
are
measured by
the
microcontroller
.
The
result is
multiplied
by
the gain to get the display value .
There
is
a
GPIB
query "
CALFACTOR "
that
will output the
calibration
settings
per
range
.
In AC ranges , calibration is done at 5 % and 95 % of full scale , because of
reduced
accuracy
of
true RMS
converter with
small
signals
.
For
the
microcontroller to
be
able to
convert
these
two
calibration
measurements to
the
standard
offset and
gain
,
both
measurements
need to be
known
.
For
that
reason
,
calibration of AC
ranges needs to be done
in a
specific order
.
The
5 %
of
full scale
calibration
needs to be
done
first
,
immediately
followed
by the
95 %
calibration
of
that
same range .
Only
after that , the
new
offset and
gain
values
will
be
checked
,
and
written to
EEPROM .
Obviously , for
proper
calibration of
both
gain and
offset , it is
necessary to do
the
offset
calibration of a
range
before
the
gain
calibration
.
DM2510
/
DM2510G
Page 6
of
17
In
normal
measurement
,
before the
settings
read
from
EEPROM are
used
,
the
firmware compares the offset and the gain with values in a table . When one of
the
EEPROM
settings of a
range
is
not
within
these
boundaries
,
the
DMM will
consider that range to be
uncalibrated .
Adjustment
Procedure
May
6 ,
1994
Revision A
}

In DC ranges , this check is done on the calibration settings of the polarity that
is
used at
that
moment . In
that way
,
the
positive
measurements
of
a
range can
be calibrated , while the negative measurements are uncalibrated .
The two
least
significant
digits
of
the
display
will
constantly
blink ,
when
a
range
is
not
fully
calibrated
.
In this case , to be able to make a measurement , the DMM microcontroller
decides to use default offset and gain values from a fixed firmware table . The
accuracy of
the instrument
is then
reduced to
about ± 2 %
!!!
Uncalibrated
ranges will only
occur when the
EEPROM is
defective
, or
when
the
EEPROM
(
U209
)
calibration
has
been
done
incorrectly or
incompletely
.
Calibration is
done
only in
4.5
digit
mode .
The
3.5
digit
measurements
are
directly
derived
from
the 4.5
digit
calibration
values
.
Calibration can
be done
in
either
50Hz or
60Hz .
Changing the
setting after
calibration will
not
degrade
performance .
Obviously ,
setting
the
line
frequency
to
the
proper
setting
during
calibration
improves
stability
and
accuracy
.
Front
Panel
Calibration
Command
Sequence
When
the
DM2510G
is in
the
calibration
mode ,
autoranging is
no
longer
functioning .
Simultaneously
pressing the UP and
the
DOWN
Autoranging
key , is now the command for the DMM to calibrate !!!
The
operator is
warned of the
DMM being in
the CAL
enabled mode , by the
constantly
blinking "
AUTO " -led .
When
a
calibration
command is
given to the
DMM
,
the
micro
-
controller
will
automatically
determine
if
an
offset
or
gain
calibration
is
required .
This is
done ,
determined by the
input
signal
level
.
During
calibration , the
operator is
kept informed
about the
status by
messages
on the display ( See Table 2 ) .
The
calibration
command
can
also
be
given
over
the
GPIB bus (
DM2510G
only ) . GPIB error messages will then also indicate the status , enabling full
automatic
verification and
calibration
over the bus .
DM2510 /
DM2510G
Page 7 of
17
Adjustment
Procedure
May 6
,
1994
Revision A
ļ
1

1 .
Message
doNE
+0000
-0000
190. ?
500.
?
4.5
d
ACV
????
UnSt
StoP
1FrSt
EErr
a .
b .
C.
d .
e .
f .
Ⓡ
DM2510
/
DM2510G
Page
8
of
17
Table 2
Displayed
Calibration
Messages
Problem
and
/
or
Suggested
Action
The
DM2510G
/
DM2510
has
successfully
executed a
calibration
step .
Adjustment :
DC
Voltage
Accuracy
Positive
offset
calibration is
busy ;
wait . (
DC Voltage
and
DC
Current
only
)
(
DC
Voltage and DC
5 %
of
full
scale
AC
calibration
command
accepted
,
continue
with
95 %
of full
scale
value
.
Negative
offset
calibration
is
busy
;
wait .
Current
only
)
100VAC
calibration
command
accepted
,
continue
with
500VAC
value
.
Select
4.5 digit ;
calibration
command
not
accepted .
Select AC
Voltage
function
;
calibration
cannot be
done in
dBm
or dBV function .
Input
reference is
outside
firmware
boundary
settings ;
calibration
command
is
not
accepted .
Unstable
input
during calibration ,
calibration
command is not
accepted .
Calibration
stopped ,
command
not
accepted :
range or
function
setting changed during calibration .
Calibration
command is
not
accepted
,
the
lower
calibration
value
should
be
applied
first .
(
AC
only )
EEPROM
error
;
attempt to
write new
settings
has
failed
.
Hardware
error ??
Set
the
DMM
in
the
DCV ,
200mV
range
.
Short
circuit the
LOW
and V / Q
/
TEMP
jacks
with
a
shorting
plug .
Press
the
DOWN
and
UP of
Autoranging
keys
simultaneously .
The
DMM will
then
calibrate the
positive
and
negative
offset .
After
writing
the
new
settings in
EEPROM
,
the
readout will
show
:
"
doNE
"
A few
seconds
later
,
the
readout
returns to
0.00mV .
The
offset
calibration of
the
200mV
range is
now
completed
(
see table 3 ) .
Repeat the
steps a
through e
for
the
remaining
DCV
ranges
.
Adjustment
Procedure
May
6 ,
1994
Revision A
1

g
.
h .
i
.
j
.
k .
1 .
m .
n .
.
P.
9
.
Remove the shorting plug and connect the DC Voltage calibrator
to the
LOW
and V /
2
/
TEMP
jacks .
Set
the
DMM
in
the
DCV ,
200mV
range .
Set
the
calibrator to
+
190.00mV
.
Press
the
DOWN
and
UP of
Autoranging
keys
simultaneously .
The
DMM
will
then
calibrate the
positive gain .
DM2510
/
DM2510G
Page
9
of
17
After
completion of the
calibration the
readout will
show
: "
doNE
" ,
and the
positive
gain is
now
successfully
writen in
EEPROM .
The DMM
display
should
now
read
+
190.0mV ± 1
count
.
Apply -190.00mV to the DMM .
Press
the
DOWN
and
UP
of
Autoranging
keys
simultaneously
.
The
DMM
will
then
calibrate
the
negative
gain .
After completion of the calibration , the readout will show :
" doNE " , meaning the negative gain is now successfully stored .
The DMM
display
should
now
read
-190.00mV
± 1
count
.
Repeat steps h through p for the 2 , 20 , 200 and 1000 Volt DC
ranges
according to the
settings in
Table 3 .
DM2510G /
DM2510
Range
Table 3 .
DC
Voltage
Calibration
Settings
200mV DC
2
V DC
20 V DC
200 V DC
1000 V DC
200mV DC
2
V DC
20 V DC
200 V DC
1000 V DC
200mV DC
2 V DC
20 V DC
200 V DC
1000 V DC
Input :
V / Ω
/ TEMP
to LOW
Shorted
Shorted
Shorted
Shorted
Shorted
+190.000 mV
+1.90000 V
+19.0000 V
+190.000 V
+1000.00 V
- 190.000 mV
-
1.90000 V
-
- 19.0000 V
- 190.000 V
- 1000.00 V
Display
reading after
Calibration ( ±
LS
digit
)
0.00
mV
0.0000 V
0.000
V
0.00 V
0.0 V
+190.00 mV
+1.9000
V
+19.000
V
+190.00
V
+1000.0 V
- 190.00 mV
-
1.9000
V
- 19.000 V
-
190.00
V
- 1000.0 V
Adjustment
Procedure
May
6 ,
1994
Revision
A

2 .
Adjustment :
Resistance
Accuracy
a .
b .
C.
d .
e .
f
.
g .
h .
i .
j
.
k
.
1 .
m
.
DM2510
/
DM2510G
Page
10
of 17
Set
the
DMM
in
the
Ohms
,
200
range .
Short
circuit
the
LOW
and V /
/
TEMP
jacks
with a
shorting
plug
.
Press
the
DOWN
and
UP of
Autoranging
keys
simultaneously .
The
DMM will
then
calibrate
the
offset
of
the
200
range
.
After writing the new settings in EEPROM the readout will show :
" doNE "
A few
seconds
later , the
readout
returns to
0.00
2.
The
offset
calibration of
the
200 2
range is
now
completed (
see
table 4 )
.
Repeat the
steps
a
through
e
for the
remaining
Ohms
ranges
.
Remove the
shorting
plug
, and
connect the
Resistance
Calibrator
to the
LOW
and V
/ 2
/
TEMP jacks
.
Set
the
DMM
in
the
Ohms
,
2002
range .
Set
the
Calibrator to
+100.000 № .
Press
the
DOWN
and
UP
of
Autoranging
keys
simultaneously .
After
completion
of
the
calibration
the
readout
will
show
: "
doNE
"
,
and the
gain of
this
range is
now
successfully
written in
EEPROM .
As a
result
,
the
DMM
display
should
now
read 100.00 2 ±
1
count
.
Repeat steps h through 1 for the 2kΩ , 20kΩ , 200kΩ , 2ΜΩ & 20Μ Ω
ranges according to the settings in Table 4 .
Adjustment
Procedure
May
6 ,
1994
Revision A
}

3 .
a .
b
.
C.
DM2510
/
DM2510G
Page
11 of
17
Table 4 .
Resistance
Calibration
Settings
DM2510G
/
DM2510
Range
200
Ω
2
ΚΩ
20 ΚΩ
200
Κ Ω
2 ΜΩ
20 ΜΩ
200
Ω
2
ΚΩ
20
ΚΩ
200
kn
2
ΜΩ
20
ΜΩ
Input
LOW to
V / Q
/
TEMP
Shorted
Shorted
Shorted
Shorted
Shorted
Shorted
100.000
Ω
1.00000 Κ
Ω
10.0000 k Ω
100.000
k Ω
1.0000 ΜΩ
10.000 ΜΩ
Adjustment
:
AC
Voltage
Accuracy
Before
the
calibration
of the
AC
Voltage
ranges can
be done ,
the
two
resistance
trimmers
R113
and
R121
need to
be
properly
adjusted .
Adjustment
:
R113 (
Frequency
Compensation )
Carefully remove the top of the cabinet .
WARNING
Display reading
after
Calibration ( +
1
LS
digit
)
0.00
Ω
.0000 k
Q
0.000 k Ω
0.00 Κ Ω
.0000 ΜΩ
0.000
ΜΩ
Set
the
calibrator to
180.000V
AC
.
100
VAC
100.000
Ω
1.00000 k Ω
10.0000 Κ Ω
100.000
k
1.0000 ΜΩ
10.000 ΜΩ
To
avoid
electric
shock
hazard
,
do
not
touch
exposed
circuitry . Use
an
insulated
alignment
tool
to
make
the
following
adjustments .
Adjustment
Procedure
May
6 ,
1994
Select
the
200V
AC
range
and
connect the
AC
Voltage
calibrator
to
the
LOW
and
V
/
22 /
TEMP
jacks .
Revision A
1

d .
Switch the frequency of the calibrator signal between 300Hz and
10kHz , and adjust R113 , until the reading is the same for both
frequencies ( within a tolerance of ± 3 counts ) .
Adjustment : R121 ( AC stage DC offset voltage ) ADJUST AT 10KHZ
R121
gives
the
ability
to
reduce
the
DC
offset
voltage
produced by the
source follower circuitry of Q100 and Q101 . When there is too much
offset
,
switching
between
ranges
,
especially the
2V
and the
20V ranges ,
will create
temporary
charge
in the
True RMS
circuitry
,
that will
disturb
proper autoranging . Re - adjustment is needed when the reading ' jumps '
more than 200 counts when switching between the 2VAC and the
20VAC
range . If
necessary
,
perform
the
following
procedure :
f .
g .
h .
i .
j
.
k .
1 .
Adjustment :
AC
Voltage
ranges .
m .
n .
Disconnect
the
AC
Voltage
calibrator
and
connect
the
shorting
plug to the
LOW and
V / 2 /
TEMP
jacks .
Select
the
20
Volt
AC
range
.
Measure
the
voltage at
U101
pin
7 (
the AC
amplifier
output
)
with
a
Digital
Multimeter
using a
mV
range .
DM2510 /
DM2510G
Page 12
of 17
Adjust
R121
to
reduce
the
DC
voltage at that
point
to
less then
20mV
.
Turn
the
power off ,
replace
the
top of
the
cabinet on
the
power
and
allow
the
instrument
time
to
warm
up .
Set
the
DMM
in
the
AC
,
200mV
range .
Connect the AC
Voltage
calibrator to
the
LOW and V /
/
TEMP
jacks .
Set the
calibrator to
10.000mV AC @
300Hz
.
Press
the
DOWN
and
UP
of
Autoranging
keys
simultaneously .
The
DMM
will
then
store
this
measurement in
RAM
memory
and
show "
190. ? '
on
the
display .
Adjustment
Procedure
May
6 ,
1994
Revision A
1

C
O.
P.
q .
r .
S.
2
2
Set the
calibrator
to
190.000mV
AC
@
300Hz
.
20
20
Press
the DOWN
and UP of
Autoranging
keys
simultaneously
.
The
DMM
will
then
calculate
the
offset
and
gain
of
the
range
.
After completion of the calibration the readout will show : " doNE " ,
and the
offset and gain
are now
successfully
written
in
EEPROM
.
As a result ,
the DMM
display
should
now
read +
190.00mV AC ± 1
count
.
DM2510G /
DM2510
Range
200mV AC
200mV AC
DM2510
/
DM2510G
Page
13
of
17
Repeat
steps
k
through r for
the 2 , 20 ,
200
and 500
VAC ranges
according to the settings in Table 5 .
V AC
V
AC
V
AC
V
AC
200 V AC
200 V AC
500 V AC
500 V AC
Ac
Voltage
Calibration
Settings
Table 5 .
Input
LOW to
V / W / TEMP
10.000 mV , 300Hz
190.000mV , 300Hz 190.00mV AC
0.10000 V , 300Hz
1.90000 V , 300Hz
1.0000
V , 300Hz
19.0000 V , 300Hz
10.000
V
,
300Hz
190.000 v , 300Hz
100.00
500.00
Display
reading
after
Calibration ( ±
1
LS
digit )
1.9000 V AC
19.000 V AC
190.00 V AC
V
,
300Hz
V , 300Hz 500.0
VAC
7400
Hz
Adjustment
Procedure
May 6 ,
1994
Revision A

4 .
Adjustment
:
a
.
b .
C.
d .
e
.
f .
g .
h .
i .
j
.
k .
1
.
m
.
n .
.
q
.
DC
Current
Accuracy
Set
the
DMM
in
the
DCA
,
200
μA
range .
Use
the
DMM
with
open
jacks .
Press
the
DOWN
and UP of
Autoranging
keys
simultaneously .
The
DMM
will then
calibrate
the
positive
and negative
offset
.
DM2510 /
DM2510G
Page 14
of
17
After writing the new settings in EEPROM the readout will show :
"
doNE
"
A few
seconds
later
, the
readout
returns to 0.00
µA .
The
offset
calibration
of
the
200
µA
range
is
now
completed
( see
table
6
) .
Repeat the
steps
a
through e for
the
remaining
DCA
ranges
.
Connect the
DC
Current
calibrator to the
LOW
and mA
jacks .
Set
the
DMM
in
the
DCA
,
200
μA
range .
Set
the
calibrator to
+190.000 μA .
Press
the
DOWN
and
UP of
Autoranging
keys
simultaneously .
The
DMM
will
then
calibrate
the
positive
gain .
After
completion of
the
calibration the
readout
will
show : "
doNE
" ,
and the positive gain is now successfully written in EEPROM .
As a
result
, the
DMM
display
should now read
+190.00 µA ± 1
count
.
Apply -190.000 μA to the DMM .
Press
the
DOWN
and
UP
of
Autoranging
keys
simultaneously
.
The
DMM
will
then
calibrate
the
negative
gain .
After
completion
of
the
calibration the
readout will
show
:
"
doNE
" ,
meaning that also
the
negative gain is
now
successfully
stored
.
Repeat steps h through p for 2 , 20 , 200 , 2000mA and 10A DC
ranges
according
to the
settings
in
Table 6 .
For 10A ,
make sure
that the DC
current
calibrator
is
connected to
the
LOW and A
input
jacks
and
the
DMM is set
to A
mode .
Adjustment Procedure
May
6 ,
1994
Revision A
1

E
5
.
a
.
b .
C.
d
.
DM2510 /
DM2510G
Page
15
of
17
DM2510G
/
DM2510
Input
LOW
to
mA
Display
reading
after
Calibration
( ±
1
LS
digit )
range
Table
6
.
DC
Current
Calibration
Settings
200
μA
DC
2
mA
DC
20
mA
DC
200
mA
DC
2000
mA
DC
10
A
DC
200
µA
DC
2
mA
DC
20
mA
DC
200
mA
DC
2000
mA
DC
10
A
DC
200 μA
DC
2
mA
DC
20
mA
DC
200
mA DC
2000
mA
DC
10
A
DC
Open
Open
Open
Open
Open
Open
+190.000
μα
+1.90000
mA
+19.0000
mA
+190.000
mA
+1900.00 mA
+10.0000
A
Adjustment :
AC
Current
Accuracy
Before
calibrating
AC
current
,
R121
adjustment
needs
to
be
correct
(
see
AC
voltage
calibration )
.
Connect
the
AC
current
calibrator to
the
LOW
and
mA
jacks .
Set
the
DMM
in
the
AC
,
200mA
range .
Set
the
calibrator
to
10.000mA
AC
@
300Hz
.
M
-
190.000
μα
-
1.90000
mA
-
19.0000 mA
-
190.000
mA
-
1900.00
mA
-
10.0000
A
0.00
με
.0000
mA
0.000
mA
0.00
mA
0.0
mA
0.000
A
+190.000
με
+1.90000
mA
+19.0000
mA
+190.000
mA
+1900.00
mA
+10.0000
A
Adjustment
Procedure
May 6 ,
1994
-
190.000
μα
-
1.90000
mA
-
19.0000
mA
-
190.000
mA
-
1900.00
mA
-
10.0000
A
Press
the
DOWN
and
UP
of
Autoranging
keys
simultaneously .
The
DMM
will
then
store
this
measurement
in
RAM
memory
and
show
"
190.
?
"
on
the
display .
Revision
A
1

6 .
e
.
f .
g .
h .
i .
Set
the
calibrator to
190.000mA AC @
300Hz
.
Press
the
DOWN
and
UP of
Autoranging
keys
simultaneously .
The
DMM
will
then
calculate
the
offset and
gain
of
the
range
.
After
completion of the
calibration the
readout
will
show
: "
doNE
" ,
and
the offset
and
gain
are
now
successfully
written in
EEPROM
.
As a
result
, the
DMM
display
should
now read
190.00mA AC
± 1
count
.
DM2510 / DM2510G
Page
16
of
17
Repeat steps b through h for the 2 , 20 , 200 , 2000mA and 10A AC
ranges according to the settings in Table 7 .
DM2510G /
DM2510
Input
LOW to
mA
Range
200 mA
AC
200
mA
AC
2
mA AC
2 mA AC
20 mA AC
20 mA AC
200 mA AC
200 mA AC
2000 mA
AC
2000 mA
AC
Table 7
.
AC
Current
Calibration
Settings
10 A , AC
10
A , AC
10.000 mA , 300Hz
190.000mA , 300Hz
0.10000mA , 300Hz
1.90000mA , 300Hz
1.0000 mA , 300Hz
19.0000mA , 300Hz
10.000 mA , 300Hz
190.000mA , 300Hz
100.00 mA , 300Hz
1900.00mA , 300Hz
1.0000
A.
300Hz
10.0000 A , 300Hz
Display
reading
after
Calibration ( ± 1
LS
digit )
190.00 A
,
AC
1.9000 mA , AC
19.000 mA , AC
190.00 mA , AC
1900.0 mA , AC
10.000 A , AC
Adjustment
:
Temperature
Accuracy
As a product option , a P6602 PT100 temperature probe can be delivered
with
the
DM2510G /
DM2510 . The
instrument is
calibrated
to
the
probe
before shipment .
When re -
calibration is
needed
, or
when a
different
P6602
probe needs to be used
,
follow the next
procedure :
Adjustment
Procedure
May 6 , 1994
Revision A

a .
b .
C.
d .
e
.
f .
g
.
h .
i .
j
.
k
.
1 .
8
Set the
DMM to
Temperature
measurement
function by
pressing
the
PROG and
TEMP key .
DM2510
/
DM2510G
Page
17 of
17
Connect the P6602 Probe to the DMM LOW and V / N / TEMP
jacks
.
Put the tip of the temperature probe about 1 inch into the
temperature bath of ° C ( ± 0.1 ° C ) .
Wait for
the
measurement to
stabilize
.
Press
the
DOWN and UP
of
Autoranging
keys
simultaneously
.
The
DMM will
then
calibrate the
offset .
After writing the new settings in EEPROM the readout will show :
"
doNE "
A few
second
later ,
the
readout
returns
to
0.0 ° C.
The offset
calibration of
the
temperature
function
is
now
completed .
Put the tip of the temperature probe about 1 inch into the
temperature bath of 100 ° C ( ± 0.1 ° C ) .
Wait
for
the
measurement to
stabilize .
Press
the DOWN
and UP of
Autoranging
keys
simultaneously .
The
DMM
will
then
calibrate
the
gain .
After completion of the calibration the readout will show : " doNE " ,
and the positive gain is now successfully written in EEPROM .
As a result , the DMM display should now read +100.0 ° C ± 1
count .
When all
previously
mentioned
calibration
steps are
successfully performed ,
re -
calibration of
the
DM2510G /
DM2510 is
completed .
Adjustment
Procedure
May 6 ,
1994
Revision A
1
¡